#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# Copyright (C) 2005-2007 by Gustavo Sverzut Barbieri
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

# Changed: $LastChangedBy$ at $LastChangedDate$

__author__ = "Gustavo Sverzut Barbieri"
__author_email__ = "barbieri@gmail.com"
__license__ = "LGPL"
__url__ = "http://www.gustavobarbieri.com.br/eagle/"
__version__ = "0.8"
__revision__ = "$Rev$"
__description__ = """\
Eagle is an abstraction layer atop Graphical Toolkits focused on
making simple applications easy to build while powerful in features.
"""
__long_description__ = """\
Eagle is an abstraction layer atop Graphical Toolkits focused on
making simple applications easy to build while powerful in features.

With Eagle you have many facilities to build application that needs
just some buttons, user input and a canvas to draw.

Canvas is really simple, what makes Eagle a great solution to
Computer Graphics and Image Processing software, the primary focus
of this library.

User input widgets are persistent, you just need to mark them
"persistent" or put them in the preferences area.

Eagle is not meant to be another Graphical Toolkit, you already
have a bunch of them, like Qt, Gtk, wxWidgets (to name just a few).
It's focused on applications that have few windows, with buttons,
simple user input and canvas. Widgets are laid out automatically
in 5 areas: left, right, top, bottom and center.

It provides useful widgets like: Color selector, Font selector,
Quit button, Preferences button and bialog, About dialog and Help
dialog.
"""
__doc__ = __long_description__

__all__ = [
    "run", "quit", "get_value", "set_value",
    "get_app_by_id", "get_widget_by_id",
    "show", "hide", "set_visible", "get_visible", "is_visible",
    "enable", "disable", "is_enabled",
    "set_active", "set_inactive", "get_active", "is_active",
    "close", "get_desktop_size",
    "App", "Menu", "Toolbar",
    "Entry", "Password",
    "Spin", "IntSpin", "UIntSpin", "Slider",
    "CheckBox",
    "Progress",
    "Color", "Font",
    "Button", "AboutButton", "CloseButton", "QuitButton", "HelpButton",
    "OpenFileButton", "SelectFolderButton", "SaveFileButton",
    "PreferencesButton",
    "Selection",
    "Group", "Tabs", "Table",
    "HSeparator", "VSeparator",
    "Label",
    "Canvas", "Image",
    "information", "info", "error", "err", "warning", "warn",
    "yesno", "confirm",
    "AboutDialog", "HelpDialog", "FileChooser",
    "RichText",
    "ExpandPolicy",
    "NativeSlot",
    ]

import os
import sys
import gc
import cPickle as pickle
import htmllib
import formatter
import weakref
import datetime
import time

try:
    import pygtk
    pygtk.require("2.0")
    import gtk
    import pango
    import gobject
except ImportError, e:
    sys.stderr.writelines(
        ("Missing module: ", str(e), "\n",
         "This module is part of pygtk (http://pygtk.org).\n",
         ))
    sys.exit(-1)

required_gtk = (2, 6, 0)
m = gtk.check_version(*required_gtk)
if m:
    sys.stderr.writelines(
        ("Error checking GTK version: %s\n"
         "This system requires pygtk >= %s, you have %s installed.\n")
        % (m,
           ".".join([str(v) for v in required_gtk]),
           ".".join([str(v) for v in gtk.pygtk_version])
           ))
    sys.exit(-1)


if not sys.platform.startswith("win"):
    gtk.gdk.threads_init() # enable threads

_apps = {}


def _gen_ro_property(name, doc=""):
    """Generates a Read-Only property.

    The generated property can be assigned only one value, if this value
    is not None, it cannot be changed.
    """
    naming = "__ro_%s__" % (name,)
    def get(self):
        try:
            return getattr(self, naming)
        except AttributeError:
            return None
    def set(self, value):
        try:
            v = getattr(self, naming)
        except AttributeError:
            v = None
        if v is None:
            setattr(self, naming, value)
        else:
            raise Exception("Read Only property '%s'." % (name,))
    return property(get, set, None, doc)


def _callback_tuple(callback):
    if not isinstance(callback, (tuple, list)):
        if callback is None:
            return tuple()
        elif callable(callback):
            return (callback,)
        else:
            raise TypeError("Callback '%s' is not callable!" % (callback,))
    else:
        for c in callback:
            if not callable(c):
                raise TypeError("Callback '%s' is not callable!" % (c,))
        return callback


def _str_tuple(string):
    if not isinstance(string, (tuple, list)):
        if string is None:
            return tuple()
        else:
            return (str(string),)
    else:
        return tuple([str(s) for s in string])


def _obj_tuple(obj):
    if not isinstance(obj, (tuple, list)):
        if obj is None:
            return tuple()
        else:
            return (obj,)
    else:
        return tuple(obj)


def _set_icon_list(gtkwidget, stock_id):
    style = gtkwidget.get_style()
    iconset = style.lookup_icon_set(stock_id)
    if iconset:
        icons = []
        for s in iconset.get_sizes():
            i = iconset.render_icon(style,
                                    gtk.TEXT_DIR_NONE,
                                    gtk.STATE_NORMAL,
                                    s,
                                    gtkwidget,
                                    None
                                    )
            icons.append(i)
        gtkwidget.set_icon_list(*icons)


class _ExpandRule(object):
    __slots__ = ("fill", "expand")
    def __init__(self, expand=False, fill=True):
        self.expand = expand
        self.fill = fill


    def __get_gtk_resize_policy__(self):
        p = 0
        if self.expand:
            p |= gtk.EXPAND
        if self.fill:
            p |= gtk.FILL
        return p


    def __str__(self):
        return "ExpandRule(expand=%s, fill=%s)" % \
            (self.expand, self.fill)
    __repr__ = __str__

class ExpandPolicy(object):
    class Policy(object):
        Rule = _ExpandRule
        __slots__ = ("horizontal", "vertical")

        def __init__(self, **kargs):
            def conv_arg(arg):
                if isinstance(arg, _ExpandRule):
                    return arg
                elif isinstance(arg, (tuple, list)):
                    return  _ExpandRule(*arg)
                elif isinstance(arg, dict):
                    return _ExpandRule(**arg)

            h = kargs.get("horizontal", None)
            if h is not None:
                self.horizontal = conv_arg(h)
            else:
                self.horizontal = _ExpandRule()

            v = kargs.get("vertical", None)
            if v is not None:
                self.vertical = conv_arg(v)
            else:
                self.vertical = _ExpandRule()


        def __str__(self):
            return "%s(horizontal=%s, vertical=%s)" % \
                (self.__class__.__name__, self.horizontal, self.vertical)
        __repr__ = __str__


    class All(Policy):
        horizontal = _ExpandRule(expand=True, fill=True)
        vertical = _ExpandRule(expand=True, fill=True)
        def __init__(self): pass


    class Nothing(Policy):
        horizontal = _ExpandRule(expand=False, fill=False)
        vertical =  _ExpandRule(expand=False, fill=False)
        def __init__(self): pass


    class Horizontal(Policy):
        horizontal = _ExpandRule(expand=True, fill=True)
        vertical = _ExpandRule(expand=False, fill=True)
        def __init__(self): pass


    class Vertical(Policy):
        horizontal = _ExpandRule(expand=False, fill=True)
        vertical = _ExpandRule(expand=True, fill=True)
        def __init__(self): pass


    class FillHorizontal(Policy):
        horizontal = _ExpandRule(expand=False, fill=True)
        vertical = _ExpandRule(expand=False, fill=False)
        def __init__(self): pass


    class FillVertical(Policy):
        horizontal = _ExpandRule(expand=False, fill=False)
        vertical = _ExpandRule(expand=False, fill=True)
        def __init__(self): pass


    class Fill(Policy):
        horizontal = _ExpandRule(expand=False, fill=True)
        vertical = _ExpandRule(expand=False, fill=True)
        def __init__(self): pass



class _Table(gtk.Table):
    """Internal widget to arrange components in tabular form.

    @warning: never use it directly in Eagle applications!
    """

    padding = 3
    id = _gen_ro_property("id")
    children = _gen_ro_property("children")
    horizontal = _gen_ro_property("horizontal")


    def __init__(self, id, children, horizontal=False):
        self.id = id
        self.horizontal = horizontal
        self.children = _obj_tuple(children)

        gtk.Table.__init__(self)

        self.set_name(id)
        self.set_homogeneous(False)
        self.__setup_gui__()


    def __setup_gui__(self):
        """Lay out components in a horizontal or vertical table."""
        if not self.children:
            return

        n = len(self.children)

        if self.horizontal:
            self.resize(2, n)
        else:
            self.resize(n, 2)

        if self.horizontal:
            orientation = _EGWidget.ORIENTATION_HORIZONTAL
        else:
            orientation = _EGWidget.ORIENTATION_VERTICAL

        for idx, c in enumerate(self.children):
            c.__configure_orientation__(orientation)
            w = c.__get_widgets__()
            policy = c.expand_policy

            if len(w) == 1:
                # use last one, in case of LabelEntry without label
                if isinstance(policy, (tuple, list)):
                    policy = policy[-1]

                xrm = policy.horizontal.__get_gtk_resize_policy__()
                yrm = policy.vertical.__get_gtk_resize_policy__()

                if self.horizontal:
                    row0 = 0
                    row1 = 2
                    col0 = idx
                    col1 = idx + 1
                else:
                    row0 = idx
                    row1 = idx + 1
                    col0 = 0
                    col1 = 2

                self.attach(w[0], col0, col1, row0, row1,
                            xoptions=xrm,
                            yoptions=yrm,
                            xpadding=self.padding,
                            ypadding=self.padding)

            elif len(w) == 2:
                if not isinstance(policy, (tuple, list)):
                    policy = (policy, policy)

                xrm = (policy[0].horizontal.__get_gtk_resize_policy__(),
                       policy[1].horizontal.__get_gtk_resize_policy__())
                yrm = (policy[0].vertical.__get_gtk_resize_policy__(),
                       policy[1].vertical.__get_gtk_resize_policy__())

                if self.horizontal:
                    row0 = 0
                    row1 = 1
                    row2 = 1
                    row3 = 2
                    col0 = idx
                    col1 = idx + 1
                    col2 = idx
                    col3 = idx + 1
                else:
                    row0 = idx
                    row1 = idx + 1
                    row2 = idx
                    row3 = idx + 1
                    col0 = 0
                    col1 = 1
                    col2 = 1
                    col3 = 2
                self.attach(w[0], col0, col1, row0, row1,
                            xoptions=xrm[0],
                            yoptions=yrm[0],
                            xpadding=self.padding,
                            ypadding=self.padding)
                self.attach(w[1], col2, col3, row2, row3,
                            xoptions=xrm[1],
                            yoptions=yrm[1],
                            xpadding=self.padding,
                            ypadding=self.padding)


    def __get_widgets__(self):
        return self.children


class _Panel(gtk.ScrolledWindow):
    """Internal widget to arrange components.

    @warning: never use it directly in Eagle applications!
    """

    spacing = 5
    app = _gen_ro_property("app")
    id = _gen_ro_property("id")
    children = _gen_ro_property("children")

    _horizontal = None
    _hscrollbar_policy = None
    _vscrollbar_policy = None

    def __init__(self, app, id, children):
        self.id = id
        self.children = _obj_tuple(children)
        self.app = app

        gtk.ScrolledWindow.__init__(self)
        self.set_name(id)
        self.__setup_gui__()


    def __setup_gui__(self):
        self.set_shadow_type(gtk.SHADOW_NONE)
        self.set_policy(hscrollbar_policy=self._hscrollbar_policy,
                        vscrollbar_policy=self._vscrollbar_policy)
        self._tab = _Table(self.id, self.children, self._horizontal)
        self.add_with_viewport(self._tab)
        self.get_child().set_shadow_type(gtk.SHADOW_NONE)


    def __add_widgets_to_app__(self):
        if not self.app:
            return
        for w in self.children:
            self.app.__add_widget__(w)

    def set_app(self, app):
        self._app = app
        self.__add_widgets_to_app__()


    def get_app(self):
        return self._app

    app = property(get_app, set_app)


    def __get_widgets__(self):
        return self._tab.__get_widgets__()


    def show(self):
        gtk.ScrolledWindow.show(self)
        self._tab.show()


    def hide(self):
        gtk.ScrolledWindow.hide(self)
        self._tab.hide()


class _VPanel(_Panel):
    """Internal widget to arrange components vertically.

    @warning: never use it directly in Eagle applications!
    """

    _horizontal = False
    _hscrollbar_policy = gtk.POLICY_NEVER
    _vscrollbar_policy = gtk.POLICY_AUTOMATIC


class _HPanel(_Panel):
    """Internal widget to arrange components horizontally.

    @warning: never use it directly in Eagle applications!
    """

    _horizontal = True
    _hscrollbar_policy = gtk.POLICY_AUTOMATIC
    _vscrollbar_policy = gtk.POLICY_NEVER


class _EGObject(object):
    """The basic Eagle Object.

    All eagle objects provides an attribute "id".

    @warning: never use it directly in Eagle applications!
    """

    id = _gen_ro_property("id")

    def __init__(self, id):
        self.id = id


    def __str__(self):
        return "%s(id=%r)" % (self.__class__.__name__, self.id)
    __repr__ = __str__


class _AutoGenId(object):
    """Mix-In to auto-generate ids.

    @warning: never use it directly in Eagle applications!
    """
    last_id_num = 0

    def __get_id__(classobj):
        if hasattr(classobj, "auto_gen_name"):
            name = getattr(classobj, "auto_gen_name")
        else:
            name = classobj.__name__

        n = "%s-%d" % (name, classobj.last_id_num)
        classobj.last_id_num += 1
        return n
    __get_id__ = classmethod(__get_id__)


class Image(_EGObject, _AutoGenId):
    """
    An image that can be loaded from files or binary data and saved to files.
    """
    _id2obj_ = weakref.WeakValueDictionary()

    def __init__(self, **kargs):
        """Image constructor.

        Images can be constructed in 2 ways using keyword arguments:
        - from files, in this case you give it B{filename} keyword:

        >>> Image(filename='myfile.png')

        - from raw data, in this case you need to provide at least
        B{data}, B{width} and B{height} as arguments. Optional
        arguments are I{depth}, I{has_alpha} and I{row_stride}.
        See L{load_data()} for more information:

        >>> Image(data=data, width=200, height=200, depth=32, has_alpha=False)

        @see: L{load_data()}
        @see: L{load_file()}
        """
        id = kargs.get("id") or self.__get_id__()
        _EGObject.__init__(self, id)

        self._img = None

        if "filename" in kargs:
            self.load_file(kargs["filename"])
        elif "data" in kargs and "width" in kargs and "height" in kargs:
            k = {"data": kargs["data"],
                 "width": kargs["width"],
                 "height": kargs["height"],
                 }
            if "depth" in kargs:
                k["depth"] = kargs["depth"]
            if "has_alpha" in kargs:
                k["has_alpha"] = kargs["has_alpha"]
            if "rowstride" in kargs:
                k["rowstride"] = kargs["rowstride"]
            self.load_data(**k)
        elif "__int_image__" in kargs:
            if isinstance(kargs["__int_image__"], gtk.gdk.Pixbuf):
                self._img = kargs["__int_image__"]
            else:
                raise ValueError("Wrong internal image given!")
        elif len(kargs) > 0:
            params = ["%s=%r" % kv for kv in kargs.iteritems()]
            raise ValueError("Unknow parameters: %s" % params)

        Image._id2obj_[self.id] = self


    def __get_gtk_pixbuf__(self):
        return self._img


    def __get_by_id__(klass, id):
        return klass._id2obj_[id]
    __get_by_id__ = classmethod(__get_by_id__)


    def __del__(self):
        gc.collect()


    def save(self, filename, format=None, **options):
        """Save image to a file.

        If format is not specified, it will be guessed from filename.

        Format may be an extension or a mime type, see
        L{get_writable_formats()}.

        @see: L{get_writable_formats()}.
        @raise Exception: if errors happened during write
        @raise ValueError: if format is unsupported
        """
        if isinstance(filename, (tuple, list)):
            filename = os.path.join(*filename)

        if format is None:
            format = filename.split(os.path.extsep)[-1]

        format = format.lower()
        t = None
        for f in self.get_writable_formats():
            if format == f["name"] or \
                    format in f["extensions"] or \
                    format in f["mime_types"]:
                t = f["name"]
                break
        if t:
            try:
                self._img.save(filename, t, options)
            except gobject.GError, e:
                raise Exception(e)
        else:
            raise ValueError("Unsupported file format: \"%s\"" % format)


    def get_formats(self):
        """Get supported image format information.

        @return: list of dicts with keys:
        - B{name}: format name
        - B{description}: format description
        - B{extensions}: extensions that match format
        - B{mime_types}: mime types that match format
        - B{is_writable}: if it is possible to write in this format, otherwise
        it's just readable
        """
        return gtk.gdk.pixbuf_get_formats()


    def get_writable_formats(self):
        """Get formats that support saving/writing.

        @see: L{get_formats()}
        """
        k = []
        for f in self.get_formats():
            if f["is_writable"]:
                k.append(f)
        return k


    def load_file(self, filename):
        """Load image from file given its filename.

        filename may be a string or a tuple/list with path elements,
        this helps your program to stay portable across different platforms.

        >>> i = Image()
        >>> i.load_file('img.png')
        >>> i.load_file(('test', 'img.png'))
        """
        if isinstance(filename, (tuple, list)):
            filename = os.path.join(*filename)

        try:
            self._img = gtk.gdk.pixbuf_new_from_file(filename)
        except gobject.GError, e:
            raise Exception(e)


    def load_data(self, data, width, height,
                  depth=24, has_alpha=None, rowstride=None):
        """Load image from raw data.

        If no value is provided as B{has_alpha}, then it's set to C{False}
        if B{depth} is less or equal 24 or set to C{True} if depth is 32.

        If no value is provided as B{rowstride}, then it's set to
        M{width * depth / bits_per_sample}.

        >>> i = Image()
        >>> i.load_data(my_data1, 800, 600, depth=32, has_alpha=False)
        >>> i.load_data(my_data2, 400, 300, depth=24)
        """
        colorspace = gtk.gdk.COLORSPACE_RGB
        bits_per_sample = 8

        if has_alpha is None:
            if depth <= 24:
                has_alpha=False
            else:
                has_alpha=True

        if rowstride is None:
            rowstride = width * depth / bits_per_sample

        if len(data) < height * rowstride:
            raise ValueError(("data must be at least "
                              "height * rowstride long."
                              "Values are: data size=%d, required=%d") %
                             (len(data), height * rowstride))

        if isinstance(data, list):
            # Convert to allowed types, from fastest to slower
            try:
                import Numeric
                data = Numeric.array(data, typecode=Numeric.Character)
            except ImportError:
                try:
                    import array
                    data = array.array('c', data)
                except:
                    data = tuple(data)

        self._img = gtk.gdk.pixbuf_new_from_data(data, colorspace,
                                                 has_alpha, bits_per_sample,
                                                 width, height, rowstride)


    def get_data(self):
        """Return raw data and information about this image.

        @return: a tuple of:
        - width
        - height
        - depth
        - has alpha?
        - rowstride
        - raw pixel data
        """
        return (self.get_width(), self.get_height(), self.get_depth(),
                self.has_alpha(), self.get_rowstride(),
                self._img.get_pixels())

    def get_width(self):
        return self._img.get_width()


    def get_height(self):
        return self._img.get_height()


    def get_size(self):
        """Return a tuple (width, heigt)"""
        return (self.get_width(), self.get_height())


    def get_rowstride(self):
        """Row stride is the allocated size of a row.

        Generally, rowstride is the number of elements in a row multiplied
        by the size of each element (bits per pixel).

        But there are cases that there is more space left, a padding, to
        align it to some boundary, so you may get different value for
        row stride.
        """
        return self._img.get_rowstride()


    def get_n_channels(self):
        """Number of channels."""
        return self._img.get_n_channels()


    def get_bits_per_pixel(self):
        """Bits per pixel"""
        return self.get_n_channels() * self._img.get_bits_per_sample()
    get_depth = get_bits_per_pixel


    def has_alpha(self):
        """If it has an alpha channel"""
        return self._img.get_has_alpha()



class _EGWidget(_EGObject):
    """The base of every Graphical Component in Eagle.

    @warning: never use it directly in Eagle applications!
    """
    app = _gen_ro_property("app")

    def __init__(self, id, app=None, expand_policy=None,
                 active=True, visible=True):
        _EGObject.__init__(self, id)
        if app is not None:
            self.app = app
        self._widgets_ = tuple()
        self._active = bool(active)
        self._visible = bool(visible)
        self.expand_policy = expand_policy or ExpandPolicy.All()


    def _set_widgets(self, value):
        self._widgets_ = value

        # force new widgets to be set active or visible depending on
        # previous settings
        self.set_active(self.get_active())
        self.set_visible(self.get_visible())


    def _get_widgets(self):
        return self._widgets_

    _widgets = property(_get_widgets, _set_widgets)


    def __get_widgets__(self):
        """Return a list of B{internal} widgets this Eagle widget contains.

        @warning: never use it directly in Eagle applications!
        """
        return self._widgets


    ORIENTATION_VERTICAL = 0
    ORIENTATION_HORIZONTAL = 1
    def __configure_orientation__(self, setting):
        pass



    def set_active(self, active=True):
        """Set the widget as active.

        An active widget have their actions enabled, while an inactive
        (active=False) will be grayed and actions disabled.
        """
        self._active = bool(active)
        for w in self.__get_widgets__():
            w.set_sensitive(active)
    enable = set_active


    def set_inactive(self):
        """Same as L{set_active}(False)"""
        self.set_active(False)
    disable = set_inactive


    def get_active(self):
        """Return True if it's active (enabled) or False inactive (disabled).
        """
        return self._active
    is_active = get_active
    is_enabled = get_active

    active = property(get_active, set_active)


    def set_visible(self, visible=True):
        """Show or hide widget based on value of 'visible'."""
        if visible:
            self.show()
        else:
            self.hide()


    def get_visible(self):
        """Return true if widget is visible (shown)."""
        return self._visible
    is_visible = get_visible

    visible = property(get_visible, set_visible)


    def show(self):
        """Make widget visible."""
        self._visible = True
        for w in self.__get_widgets__():
            w.show()


    def hide(self):
        """Make widget invisible."""
        self._visible = False
        for w in self.__get_widgets__():
            w.hide()


    def focus(self):
        """Give keyboard focus to this widget."""
        for w in self.__get_widgets__():
            w.grab_focus()


class _EGDataWidget(_EGWidget):
    """The base of every Eagle widget that holds data.

    Widgets that holds data implement the interface with L{get_value}() and
    L{set_value}().

    It can be made persistent with L{persistent}=True
    """
    persistent = False

    def __init__(self, id, persistent, app=None, expand_policy=None,
                 active=True, visible=True):
        _EGWidget.__init__(self, id, expand_policy=expand_policy,
                           active=active, visible=visible)
        if app is not None:
            self.app = app
        self.persistent = persistent
        self._widgets = tuple()


    def get_value(self):
        """Get data from this widget."""
        raise NotImplementedError("%s doesn't implement get_value()" %
                                  self.__class__.__name__)

    def set_value(self, value):
        """Set data to this widget."""
        raise NotImplementedError("%s doesn't implement set_value()" %
                                  self.__class__.__name__)


class AboutDialog(_EGWidget, _AutoGenId):
    """A window that displays information about the application.

    @attention: avoid using this directly, use L{AboutButton} instead.
    """
    border = 12
    spacing = 6
    width = 600
    height = 400
    margin = 6

    def __init__(self, app,
                 title, author=None, description=None, help=None,
                 version=None, license=None, copyright=None):
        _EGWidget.__init__(self, self.__get_id__(), app)
        self.title = str(title)
        self.author = _str_tuple(author)
        self.description = _str_tuple(description)
        self.help = _str_tuple(help)
        self.version = _str_tuple(version)
        self.license = _str_tuple(license)
        self.copyright = _str_tuple(copyright)
        self._diag = None

        self.__setup_gui__()


    def __del__(self):
        if self._diag:
            self._diag.destroy()


    def __setup_gui__(self):
        win = self.app.__get_window__()
        btns = (gtk.STOCK_CLOSE, gtk.RESPONSE_CLOSE)
        flags = gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT
        self._diag = gtk.Dialog(title=("About: %s" % self.title),
                                parent=win,
                                flags=flags, buttons=btns)

        self._diag.set_border_width(self.border)
        self._diag.set_default_size(self.width, self.height)
        self._diag.set_has_separator(False)
        self._diag.vbox.set_spacing(self.spacing)

        _set_icon_list(self._diag, gtk.STOCK_ABOUT)

        self._text = RichText(id="About-%s" % self.app.id,
                              callback=self.__link_handler__)
        self._diag.vbox.pack_start(self._text._widgets[0], True, True)

        self.__setup_text__()


    def __setup_text__(self):
        self._text.append("<h1>%s</h1>" % self.title)

        if self.version:
            v = ".".join(self.version)
            self._text.append("<i>%s</i>" % v)

        self._text.append("<hr />")

        if self.description:
            self._text.append("<h2>Description</h2>")
            for l in self.description:
                self._text.append("<p>%s</p>" % l)

        if self.license:
            self._text.append("<h2>License</h2><p>")
            self._text.append(", ".join(self.license))
            self._text.append("</p>")

        if self.author:
            if len(self.author) == 1:
                self._text.append("<h2>Author</h2>")
            else:
                self._text.append("<h2>Authors</h2>")

            self._text.append("<ul>")
            for a in self.author:
                self._text.append("<li>%s</li>" % a)
            self._text.append("</ul>")

        if self.help:
            self._text.append("<h2>Help</h2>")
            for l in self.help:
                self._text.append("<p>%s</p>" % l)

        if self.copyright:
            self._text.append("<h2>Copyright</h2>")
            for l in self.copyright:
                self._text.append("<p>%s</p>" % l)


    def __link_handler__(self, app, textview, href, offset):
        import webbrowser
        webbrowser.open(href, new=1)


    def run(self):
        self._diag.show_all()
        self._diag.run()
        self._diag.hide()


class HelpDialog(_EGWidget, _AutoGenId):
    """A window that displays application help.

    @attention: avoid using this directly, use L{HelpButton} instead.
    """
    border = 12
    spacing = 6
    width = 600
    height = 400
    margin = 6

    def __init__(self, app, title, help=None):
        _EGWidget.__init__(self, self.__get_id__(), app)
        self.title = title
        self.help = _str_tuple(help)

        self._diag = None
        self.__setup_gui__()


    def __del__(self):
        if self._diag:
            self._diag.destroy()


    def __setup_gui__(self):
        win = self.app.__get_window__()
        btns = (gtk.STOCK_CLOSE, gtk.RESPONSE_CLOSE)
        flags = gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT
        self._diag = gtk.Dialog(title=("Help: %s" % self.title),
                                parent=win,
                                flags=flags, buttons=btns)
        self._diag.set_border_width(self.border)
        self._diag.set_default_size(self.width, self.height)
        self._diag.set_has_separator(False)
        self._diag.vbox.set_spacing(self.spacing)
        _set_icon_list(self._diag, gtk.STOCK_HELP)

        self._text = RichText(id="About-%s" % self.app.id,
                              callback=self.__link_handler__)
        self._diag.vbox.pack_start(self._text._widgets[0], True, True)

        self.__setup_text__()


    def __setup_text__(self):
        self._text.append("<h1>%s</h1>" % self.title)
        self._text.append("<h2>Help</h2>")
        for l in self.help:
            self._text.append("<p>%s</p>" % l)


    def __link_handler__(self, app, textview, href, offset):
        import webbrowser
        webbrowser.open(href, new=1)


    def run(self):
        self._diag.show_all()
        self._diag.run()
        self._diag.hide()


class FileChooser(_EGWidget, _AutoGenId):
    """A dialog to choose a file.

    @attention: avoid using this directly, use L{App.file_chooser},
    L{OpenFileButton}, L{SaveFileButton} or L{SelectFolderButton} instead.
    """
    ACTION_OPEN = 0
    ACTION_SAVE = 1
    ACTION_SELECT_FOLDER = 2
    ACTION_CREATE_FOLDER = 3

    def __init__(self, app, action, filename=None,
                 title=None, filter=None, multiple=False):
        """Dialog to choose files.

        filter may be a single pattern (ie: '*.png'), mime type
        (ie: 'text/html') or a list of patterns or mime types or
        a list of lists, each sub list with a filter name and mime type/
        patterns accepted. Examples:
        [['Images', '*.ppm', 'image/jpeg', 'image/png'],
        ['Text', '*.text', 'text/plain'],
        ]
        """
        _EGWidget.__init__(self, self.__get_id__(), app)
        self.action = action
        self.filter = filter
        self.multiple = multiple or False
        self.filename = filename
        self.title = title  or self.__gen_title__()

        self._diag = None
        self.__setup_gui__()


    def __gen_title__(self):
        t = {self.ACTION_OPEN: "Open: %s",
             self.ACTION_SAVE: "Save: %s",
             self.ACTION_SELECT_FOLDER: "Open Folder: %s",
             self.ACTION_CREATE_FOLDER: "Create Folder: %s",
             }
        title = t.get(self.action, t[self.ACTION_OPEN])
        return title % self.app.title


    def __del__(self):
        if self._diag:
            self._diag.destroy()


    def __setup_gui__(self):
        win = self.app.__get_window__()
        a = {self.ACTION_OPEN: gtk.FILE_CHOOSER_ACTION_OPEN,
             self.ACTION_SAVE: gtk.FILE_CHOOSER_ACTION_SAVE,
             self.ACTION_SELECT_FOLDER: gtk.FILE_CHOOSER_ACTION_SELECT_FOLDER,
             self.ACTION_CREATE_FOLDER: gtk.FILE_CHOOSER_ACTION_CREATE_FOLDER,
             }.get(self.action, gtk.FILE_CHOOSER_ACTION_OPEN)

        b = (gtk.STOCK_OPEN, gtk.RESPONSE_ACCEPT,
             gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL)
        self._diag = gtk.FileChooserDialog(title=self.title,
                                           parent=win,
                                           action=a,
                                           buttons=b)
        _set_icon_list(self._diag, gtk.STOCK_OPEN)
        self._diag.set_select_multiple(self.multiple)
        if self.filter:
            if isinstance(self.filter, (tuple, list)):
                for f in self.filter:
                    filter = gtk.FileFilter()
                    if isinstance(f, (tuple, list)):
                        filter.set_name(f[0])
                        for e in f[1 :]:
                            if '/' in e:
                                filter.add_mime_type(e)
                            else:
                                filter.add_pattern(e)
                    elif isinstance(f, (str, unicode)):
                        filter.set_name(f)
                        if '/' in f:
                            filter.add_mime_type(f)
                        else:
                            filter.add_pattern(f)
                    else:
                        raise ValueError("invalid filter!")
                    self._diag.add_filter(filter)

            elif isinstance(self.filter, (str, unicode)):
                filter = gtk.FileFilter()
                filter.set_name(self.filter)
                if '/' in self.filter:
                    filter.add_mime_type(self.filter)
                else:
                    filter.add_pattern(self.filter)
                self._diag.set_filter(filter)
            else:
                raise ValueError("invalid filter!")
        if self.filename:
            self._diag.set_filename(self.filename)


    def run(self):
        self._diag.show_all()
        r = self._diag.run()
        self._diag.hide()
        if r == gtk.RESPONSE_ACCEPT:
            return self._diag.get_filename()
        else:
            return None


class PreferencesDialog(_EGWidget, _AutoGenId):
    """A dialog to present user with preferences.

    Preferences is another L{App} area, just like C{left}, C{right}, C{center},
    C{top} or C{bottom}, but will be displayed in a separate window.

    @attention: avoid using this directly, use L{PreferencesButton} instead.
    """
    def __init__(self, app, children):
        _EGWidget.__init__(self, self.__get_id__(), app)
        self.children = _obj_tuple(children)

        self._diag = None
        self.__setup_gui__()
        self.__add_widgets_to_app__()


    def __del__(self):
        if self._diag:
            self._diag.destroy()


    def __setup_gui__(self):
        win = self.app.__get_window__()
        btns = (gtk.STOCK_CLOSE, gtk.RESPONSE_CLOSE)
        flags = gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT
        self._diag = gtk.Dialog(title=("Preferences: %s" % self.app.title),
                                parent=win,
                                flags=flags, buttons=btns)
        self._diag.set_default_size(400, 300)
        _set_icon_list(self._diag, gtk.STOCK_PREFERENCES)

        self._sw = gtk.ScrolledWindow()
        self._diag.get_child().pack_start(self._sw, expand=True, fill=True)

        self._sw.set_policy(hscrollbar_policy=gtk.POLICY_AUTOMATIC,
                            vscrollbar_policy=gtk.POLICY_AUTOMATIC)

        self._tab = _Table(self.id, self.children)
        self._sw.add_with_viewport(self._tab)
        self._sw.get_child().set_shadow_type(gtk.SHADOW_NONE)
        self._sw.set_shadow_type(gtk.SHADOW_NONE)


    def __add_widgets_to_app__(self):
        for w in self.children:
            if isinstance(w, _EGDataWidget):
                w.persistent = True
            self.app.__add_widget__(w)


    def run(self):
        self._diag.show_all()
        self._diag.run()
        self._diag.hide()


class DebugDialog(_EGObject, _AutoGenId):
    """Dialog to show uncaught exceptions.

    This dialog shows information about uncaught exceptions and also save
    the traceback to a file.
    """
    # Most of DebugDialog code came from Gazpacho code! Thanks!
    border = 12
    spacing = 6
    width = 600
    height = 400
    margin = 6

    def __init__(self):
        _EGObject.__init__(self, self.__get_id__())
        self.__setup_gui__()


    def __setup_gui__(self):
        b = (gtk.STOCK_QUIT, gtk.RESPONSE_CLOSE)
        self._diag = gtk.Dialog("Application Crashed!",
                                parent=None,
                                flags=gtk.DIALOG_MODAL,
                                buttons=b)
        self._diag.set_border_width(self.border)
        self._diag.set_default_size(self.width, self.height)
        self._diag.set_has_separator(False)
        self._diag.vbox.set_spacing(self.spacing)

        self._hbox1 = gtk.HBox()

        self._label1 = gtk.Label("<b>Exception type:</b>")
        self._label1.set_use_markup(True)
        self._hbox1.pack_start(self._label1, False, False, self.spacing)
        self._label1.show()

        self._exctype = gtk.Label()
        self._hbox1.pack_start(self._exctype, False, True)
        self._exctype.show()

        self._diag.vbox.pack_start(self._hbox1, False, False)
        self._hbox1.show()

        self._hbox2 = gtk.HBox()

        self._label2 = gtk.Label("<b>This info was saved to:</b>")
        self._label2.set_use_markup(True)
        self._hbox2.pack_start(self._label2, False, False, self.spacing)
        self._label2.show()

        self._save_name = gtk.Label()
        self._hbox2.pack_start(self._save_name, False, True)
        self._save_name.show()

        self._diag.vbox.pack_start(self._hbox2, False, False)
        self._hbox2.show()

        self._sw = gtk.ScrolledWindow()
        self._sw.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        self._sw.set_shadow_type(gtk.SHADOW_IN)
        self._text = gtk.TextView()
        self._text.set_editable(False)
        self._text.set_cursor_visible(False)
        self._text.set_wrap_mode(gtk.WRAP_WORD)
        self._text.set_left_margin(self.margin)
        self._text.set_right_margin(self.margin)

        self._sw.add(self._text)
        self._text.show()
        self._diag.vbox.pack_start(self._sw, expand=True, fill=True)
        self._sw.show()
        self.__setup_text__()


    def __setup_text__(self):
        self._buf = self._text.get_buffer()
        self._buf.create_tag("label", weight=pango.WEIGHT_BOLD)
        self._buf.create_tag("code", foreground="gray25",
                             family="monospace")
        self._buf.create_tag("exc", foreground="#880000",
                             weight=pango.WEIGHT_BOLD)


    def show_exception(self, exctype, value, tb):
        import traceback
        self._exctype.set_text(str(exctype))
        self.print_tb(tb)

        lines = traceback.format_exception_only(exctype, value)
        msg = lines[0]
        result = msg.split(' ', 1)
        if len(result) == 1:
            msg = result[0]
            arguments = ""
        else:
            msg, arguments = result

        self._insert_text("\n")
        self._insert_text(msg, "exc")
        self._insert_text(" ")
        self._insert_text(arguments)


    def save_exception(self, exctype, value, tb):
        import traceback
        import time
        import tempfile
        progname = os.path.split(sys.argv[0])[-1]
        filename = "%s-%s.tb" % (progname,
                                 int(time.time()))
        filename = os.path.join(os.path.sep, tempfile.gettempdir(), filename)
        f = open(filename, "wb")
        try:
            os.chmod(filename, 0600)
        except:
            pass

        for e in traceback.format_exception(exctype, value, tb):
            f.write(e)
        f.close()
        self._save_name.set_text(filename)
        sys.stderr.write("Traceback saved to '%s'.\n" % filename)


    def print_tb(self, tb, limit=None):
        import linecache

        if limit is None:
            if hasattr(sys, "tracebacklimit"):
                limit = sys.tracebacklimit
        n = 0
        while tb is not None and (limit is None or n < limit):
            f = tb.tb_frame
            lineno = tb.tb_lineno
            co = f.f_code
            filename = co.co_filename
            name = co.co_name
            self._print_file(filename, lineno, name)
            line = linecache.getline(filename, lineno)
            if line:
                self._insert_text("    " + line.strip() + "\n\n", "code")
            tb = tb.tb_next
            n = n+1


    def _insert_text(self, text, *tags):
        end_iter = self._buf.get_end_iter()
        self._buf.insert_with_tags_by_name(end_iter, text, *tags)


    def _print_file(self, filename, lineno, name):
        if filename.startswith(os.getcwd()):
            filename = filename.replace(os.getcwd(), '')[1 :]

        self._insert_text("File: ", "label")
        self._insert_text(filename)
        self._insert_text("\n")
        self._insert_text("Line: ", "label")
        self._insert_text(str(lineno))
        self._insert_text("\n")
        self._insert_text("Function: ", "label")
        self._insert_text(name)
        self._insert_text("\n")

    def _start_debugger(self):
        import pdb
        pdb.pm()



    def run(self, error=None):
        r = self._diag.run()
        if r == gtk.RESPONSE_CLOSE or gtk.RESPONSE_DELETE_EVENT:
            raise SystemExit(error)


    def except_hook(exctype, value, tb):
        if exctype is not KeyboardInterrupt:
            d = DebugDialog()
            d.save_exception(exctype, value, tb)
            d.show_exception(exctype, value, tb)
            d.run()
            d.destroy()

        raise SystemExit
    except_hook = staticmethod(except_hook)
sys.excepthook = DebugDialog.except_hook


class _EGWidLabelEntry(_EGDataWidget):
    """Widget that holds a label and an associated Entry.

    @note: _EGWidLabelEntry must B{NOT} be used directly! You should use
    a widget that specialize this instead.

    @attention: B{Widget Developers:} You must setup an instance attribute
    C{_entry} before using it, since this will be set as mnemonic for this
    label and also returned in L{__get_widgets__}().
    """

    def __init__(self, id, persistent, label="", expand_policy=None,
                 active=True, visible=True):
        """
        @param expand_policy: one or two ExpandPolicy elements. If just
        one is provided, it will be used for both inner elements.
        If two are provided, first will be used for label and
        second for entry.
        """
        if expand_policy is None:
            expand_policy = (ExpandPolicy.Fill(),
                             ExpandPolicy.Horizontal())
        elif not isinstance(expand_policy, (list, tuple)):
            expand_policy = (expand_policy, expand_policy)

        _EGDataWidget.__init__(self, id, persistent,
                               expand_policy=expand_policy,
                               active=active, visible=visible)
        self.__label = label
        self.__setup_gui__()


    def __setup_gui__(self):
        if self.__label is not None:
            self._label = gtk.Label(self.__label)
            self._label.set_mnemonic_widget(self._entry)
            self._widgets = (self._label, self._entry)
        else:
            self._widgets = (self._entry,)


    def __configure_orientation__(self, setting):
        if self.label:
            if   setting == self.ORIENTATION_VERTICAL:
                self._label.set_justify(gtk.JUSTIFY_RIGHT)
                self._label.set_alignment(xalign=1.0, yalign=0.5)
            elif setting == self.ORIENTATION_HORIZONTAL:
                self._label.set_justify(gtk.JUSTIFY_LEFT)
                self._label.set_alignment(xalign=0.0, yalign=1.0)


    def get_value(self):
        return self._entry.get_value()


    def set_value(self, value):
        self._entry.set_value(value)


    def set_label(self, label):
        if self.__label is None:
            raise ValueError("You cannot change label of widget created "
                             "without one. Create it with placeholder! "
                             "(label='')")
        self.__label = label
        self._label.set_text(self.__label)


    def get_label(self):
        return self.__label

    label = property(get_label, set_label)


    def __str__(self):
        return "%s(id=%r, label=%r, value=%r)" % \
            (self.__class__.__name__, self.id, self.label,
             self.get_value())
    __repr__ = __str__


class Menu(object):
    class BaseItem(_EGObject, _AutoGenId):
        _wid = _gen_ro_property("_wid")
        auto_gen_name = "Menu.BaseItem"

        def __init__(self, id=None, active=True, visible=True):
            _EGObject.__init__(self, id or self.__get_id__())
            self._wid = None
            self.app = None
            self.__setup_gui__()
            self._wid.show()
            self.active = active
            self.visible = visible


        def __setup_gui__(self):
            pass


        def __str__(self):
            return "%s(active=%r, visible=%r)" % \
                (self.__class__.__name__, self.active, self.visible)
        __repr__ = __str__


        def set_active(self, active=True):
            """Set the menu item as active.

            An active menu have their actions enabled, while an inactive
            (active=False) will be grayed and actions disabled.
            """
            self._wid.set_sensitive(bool(active))
        enable = set_active


        def set_inactive(self):
            """Same as L{set_active}(False)"""
            self.set_active(False)
        disable = set_inactive


        def get_active(self):
            """Return True if it's active (enabled) or False
            inactive (disabled).
            """
            return not (self._wid.state & gtk.STATE_INSENSITIVE)
        is_active = get_active
        is_enabled = get_active

        active = property(get_active, set_active)


        def set_visible(self, visible=True):
            """Show or hide menu item based on value of 'visible'."""
            if visible:
                self.show()
            else:
                self.hide()


        def get_visible(self):
            """Return true if menu item is visible (shown)."""
            return self._visible
        is_visible = get_visible

        visible = property(get_visible, set_visible)


        def show(self):
            """Make menu item visible."""
            self._visible = True
            self._wid.show()


        def hide(self):
            """Make menu item invisible."""
            self._visible = False
            self._wid.hide()


    class Separator(BaseItem):
        auto_gen_name = "Menu.Separator"

        def __setup_gui__(self):
            self._wid = gtk.SeparatorMenuItem()


    class Item(BaseItem):
        """Simple menu item composed of text and callback function."""
        auto_gen_name = "Menu.Item"

        def __init__(self, id=None, label="", callback=None, active=True,
                     visible=True):
            """Menu.Item constructor.

            @param id: unique id to this application, or None to generate one
            automatically.
            @param label: some text to display.
            @param callback: function or tuple of functions to be called
            back when item is clicked. Callbacks should have
            the following signature:

            def callback(app, menu_item):

            where app is the App instance that contains this item
            and menu_item is an instance to clicked item.
            @param active: boolean to set item state.
            @param visible: boolean to set item visibility.
            """
            self.label = label or ""
            self.callback = _callback_tuple(callback)

            Menu.BaseItem.__init__(self, id,  active=active, visible=visible)


        def __setup_gui__(self):
            self._wid = gtk.MenuItem(label=self.label)
            if self.callback:
                def cb(wid):
                    for c in self.callback:
                        c(self.app, self)
                self._wid.connect("activate", cb)


        def set_label(self, value):
            self._label = value
            if self._wid:
                self._wid.child.set_text(self._label)

        def get_label(self):
            return self._label

        label = property(get_label, set_label)


        def __str__(self):
            return "%s(label=%r, callback=%r, activate=%r, visible=%r)" \
                % (self.__class__.__name__, self.label, self.callback,
                   self.active, self.visible)
        __repr__ = __str__


    class Submenu(BaseItem):
        """Menu item that have sub items."""
        subitems = _gen_ro_property("subitems")
        auto_gen_name = "Menu.Submenu"

        def __init__(self, id=None, label="", subitems=None, active=True,
                     visible=True):
            """Menu.Submenu constructor.

            @param id: unique id to this application, or None to generate one
            automatically.
            @param label: some text to display.
            @param subitems: list of Menu.BaseItem derived objects.
            @param active: boolean to set item state.
            @param visible: boolean to set item visibility.
            """
            self.label = label or ""
            self.subitems = _obj_tuple(subitems)

            Menu.BaseItem.__init__(self, id, active=active, visible=visible)


        def __setup_gui__(self):
            self._menu = gtk.Menu()
            self._wid = gtk.MenuItem(label=self.label)
            self._wid.set_submenu(self._menu)
            for i in self.subitems:
                if not isinstance(i, Menu.BaseItem):
                    raise ValueError(("Subitem shoud be subclass of "
                                      "BaseItem, but got %s instead!") %
                                     type(i).__name__)
                self._menu.append(i._wid)


        def __str__(self):
            return "%s(label=%r, subitems=%r, active=%r, visible=%r)" % \
                (self.__class__.__name__, self.label, self.subitems,
                 self.active, self.visible)
        __repr__ = __str__


        def set_label(self, value):
            self._label = value
            if self._wid:
                self._wid.child.set_text(self._label)

        def get_label(self):
            return self._label

        label = property(get_label, set_label)


        def _get_app(self):
            try:
                return self.__ro_app
            except AttributeError:
                return None

        def _set_app(self, value):
            # We need to overload app setter in order to set
            # subitem's _app.
            try:
                v = self.__ro_app
            except AttributeError:
                v = None
            if v is None:
                self.__ro_app = value
                if value:
                    for item in self.subitems:
                        value.__add_widget__(item)
            else:
                raise Exception("Read Only property 'app'.")
        app = property(_get_app, _set_app)


class Toolbar(object):
    class BaseItem(_EGObject, _AutoGenId):
        _wid = _gen_ro_property("_wid")
        auto_gen_name = "Toolbar.BaseItem"

        def __init__(self, id=None, active=True, visible=True):
            _EGObject.__init__(self, id or self.__get_id__())
            self._wid = None
            self.app = None
            self.__setup_gui__()
            self._wid.show()
            self.active = active
            self.visible = visible


        def __setup_gui__(self):
            pass


        def __str__(self):
            return "%s(active=%r, visible=%r)" % \
                (self.__class__.__name__, self.active, self.visible)
        __repr__ = __str__


        def set_active(self, active=True):
            """Set the toolbar item as active.

            An active toolbar item have their actions enabled, while
            an inactive (active=False) will be grayed and actions
            disabled.
            """
            self._wid.set_sensitive(bool(active))
        enable = set_active


        def set_inactive(self):
            """Same as L{set_active}(False)"""
            self.set_active(False)
        disable = set_inactive


        def get_active(self):
            """Return True if it's active (enabled) or False
            inactive (disabled).
            """
            return not (self._wid.state & gtk.STATE_INSENSITIVE)
        is_active = get_active
        is_enabled = get_active

        active = property(get_active, set_active)


        def set_visible(self, visible=True):
            """Show or hide toolbar item based on value of 'visible'."""
            if visible:
                self.show()
            else:
                self.hide()


        def get_visible(self):
            """Return true if toolbar item is visible (shown)."""
            return self._visible
        is_visible = get_visible

        visible = property(get_visible, set_visible)


        def show(self):
            """Make toolbar item visible."""
            self._visible = True
            self._wid.show()


        def hide(self):
            """Make toolbar item invisible."""
            self._visible = False
            self._wid.hide()


    class Separator(BaseItem):
        auto_gen_name = "Toolbar.Separator"

        def __setup_gui__(self):
            self._wid = gtk.SeparatorToolItem()


    class Item(BaseItem):
        """Simple toolbar item composed of text, icon, tooltip and
        callback function.
        """
        auto_gen_name = "Toolbar.Item"

        def __init__(self, id=None, label="", image=None, stock=None,
                     tooltip=None, callback=None, active=True, visible=True):
            """Toolbar.Item constructor.

            @param id: unique id to this application, or None to generate one
            automatically.
            @param label: some text to display.
            @param image: icon image to display, should be a filename
            or eagle.Image.
            @param stock: optional. One of L{Button.stock_items}.
            @param tooltip: extra text to display when mouse is over
            this item.
            @param callback: function or tuple of functions to be called
            back when item is clicked. Callbacks should have
            the following signature:

            def callback(app, toolbar_item):

            where app is the App instance that contains this item
            and toolbar_item is an instance to clicked item.
            @param active: boolean to set item state.
            @param visible: boolean to set item visibility.
            """
            self.label = label or ""
            self.image = image
            self.stock = stock
            self.tooltip = tooltip or ""
            self.callback = _callback_tuple(callback)

            Toolbar.BaseItem.__init__(self, id, active=active,
                                      visible=visible)


        def __setup_gui__(self):
            if self.stock:
                try:
                    sid = Button._gtk_stock_map[self.stock]
                except KeyError, e:
                    raise ValueError("unknown stock '%s'." % self.stock)
                self._wid = gtk.ToolButton(sid)
            else:
                self._img = gtk.Image()
                self._img.show()
                self._img.set_from_pixbuf(self.image.__get_gtk_pixbuf__())
                self._wid = gtk.ToolButton(icon_widget=self._img,
                                           label=self.label)

            if self.callback:
                def cb(wid):
                    for c in self.callback:
                        c(self.app, self)
                self._wid.connect("clicked", cb)


        def __str__(self):
            return ("%s(label=%r, image=%r, stock=%r, tooltip=%r, "
                    "callback=%r, activate=%r, visible=%r)") % \
                    (self.__class__.__name__, self.label,
                     self.image, self.stock, self.tooltip, self.callback,
                     self.active, self.visible)
        __repr__ = __str__


        def set_label(self, value):
            self._label = value
            if self._wid:
                self._wid.set_label(self._label)

        def get_label(self):
            return self._label

        label = property(get_label, set_label)


        def set_image(self, value):
            if value is None:
                self._image = None
                return

            if isinstance(value, basestring):
                value = Image(filename=value)
            elif not isinstance(value, Image):
                raise ValueError(("image should be string or instance "
                                  "of eagle.Image, got %r instead.") %
                                 type(value).__name__)
            self._image = value
            if self._wid:
                self._img.set_from_pixbuf(value.__get_gtk_pixbuf__())

        def get_image(self):
            return self._image

        image = property(get_image, set_image)


        def set_tooltip(self, value):
            self._tooltip = value or ""
            if self._wid and self.app and self._tooltip:
                self._wid.set_tooltip(self.app._tooltips, self._tooltip)

        def get_tooltip(self):
            return self._tooltip

        tooltip = property(get_tooltip, set_tooltip)


        def _get_app(self):
            try:
                return self.__ro_app
            except AttributeError:
                return None

        def _set_app(self, value):
            # We need to overload app setter in order to set
            try:
                v = self.__ro_app
            except AttributeError:
                v = None
            if v is None:
                self.__ro_app = value
                if self._wid:
                    self._wid.set_tooltip(value._tooltips, self.tooltip)
            else:
                raise Exception("Read Only property 'app'.")
        app = property(_get_app, _set_app)


class App(_EGObject, _AutoGenId):
    """An application window.

    This is the base of Eagle programs, since it will hold every graphical
    component.

    An App window is split in 5 areas:
    - left
    - right
    - center
    - top
    - bottom
    the first 3 have a vertical layout, the other have horizontal layout.
    Every area has its own scroll bars that are shown automatically when
    need.

    Also provided is an extra area, that is shown in another window. This is
    the preferences area. It have a vertical layout and components that
    hold data are made persistent automatically. You should use
    L{PreferencesButton} to show this area.

    Extra information like author, description, help, version, license and
    copyright are used in specialized dialogs. You may show these dialogs
    with L{AboutButton} and L{HelpButton}.

    Widgets can be reach with L{get_widget_by_id}, example:
    >>> app = App("My App", left=Entry(id="entry"))
    >>> app.get_widget_by_id("entry")
    Entry(id='entry', label='entry', value='')

    You may also reach widgets using dict-like syntax, but with the
    special case for widgets that hold data, these will be provided
    using their L{set_data<_EGDataWidget.set_data>} and
    L{get_data<_EGDataWidget.get_data>}, it make things easier, but
    B{be careful to don't misuse it!}. Example:

    >>> app = App("My App", left=Entry(id="entry"),
    ...           right=Canvas("canvas", 300, 300))
    >>> app["entry"]
    ''
    >>> app["entry"] = "text"
    >>> app["entry"]
    'text'
    >>> app["canvas"]
    Canvas(id='canvas', width=300, height=300, label='')
    >>> app["canvas"].draw_text("hello")
    >>> app["entry"].get_value() # will fail, since it's a data widget

    """


    border_width = 10
    spacing = 3

    title = _gen_ro_property("title")
    left = _gen_ro_property("left")
    right = _gen_ro_property("right")
    top = _gen_ro_property("top")
    bottom = _gen_ro_property("bottom")
    center = _gen_ro_property("center")
    preferences = _gen_ro_property("preferences")
    statusbar = _gen_ro_property("statusbar")
    menu = _gen_ro_property("menu")
    toolbar = _gen_ro_property("toolbar")
    _widgets = _gen_ro_property("_widgets")

    def __init__(self, title, id=None,
                 center=None, left=None, right=None, top=None, bottom=None,
                 preferences=None, window_size=(800, 600),
                 window_position=None, window_decorated=True,
                 menu=None, toolbar=None,
                 quit_callback=None, data_changed_callback=None,
                 author=None, description=None, help=None, version=None,
                 license=None, copyright=None,
                 statusbar=False, visible=True):
        """App Constructor.

        @param title: application name, to be displayed in the title bar.
        @param id: unique id to this application, or None to generate one
        automatically.
        @param center: list of widgets to be laid out vertically in the
        window's center.
        @param left: list of widgets to be laid out vertically in the
        window's left side.
        @param right: list of widgets to be laid out vertically in the
        window's right side.
        @param top: list of widgets to be laid out horizontally in the
        window's top.
        @param bottom: list of widgets to be laid out horizontally in the
        window's bottom.
        @param preferences: list of widgets to be laid out vertically in
        another window, this can be shown with L{PreferencesButton}.
        @param window_size: tuple of (width, height) or None to use the
        default size.
        @param window_position: tuple of (x, y) or None to position
        window.
        @param window_decorated: boolean used to add or remove border,
        title bar and other decorations from window.
        @param menu: a list of Menu.BaseItem subclasses.
        @param toolbar: a list of Toolbar.BaseItem subclasses.
        @param statusbar: if C{True}, an statusbar will be available and
        usable with L{status_message} method.
        @param author: the application author or list of author, used in
        L{AboutDialog}, this can be shown with L{AboutButton}.
        @param description: application description, used in L{AboutDialog}.
        @param help: help text, used in L{AboutDialog} and L{HelpDialog}, this
        can be shown with L{HelpButton}.
        @param version: application version, used in L{AboutDialog}.
        @param license: application license, used in L{AboutDialog}.
        @param copyright: application copyright, used in L{AboutDialog}.
        @param quit_callback: function (or list of functions) that will be
        called when application is closed. Function will receive as
        parameter the reference to App. If return value is False,
        it will abort closing the window.
        @param data_changed_callback: function (or list of functions) that will
        be called when some widget that holds data have its data
        changed. Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        """
        _EGObject.__init__(self, id)
        self.left = left
        self.right = right
        self.top = top
        self.bottom = bottom
        self.center = center
        self.preferences = preferences
        self.author = _str_tuple(author)
        self.description = _str_tuple(description)
        self.help = _str_tuple(help)
        self.version = _str_tuple(version)
        self.license = _str_tuple(license)
        self.copyright = _str_tuple(copyright)
        self.statusbar = statusbar
        self.menu = _obj_tuple(menu)
        self.toolbar = _obj_tuple(toolbar)
        self._visible = bool(visible)
        self._widgets = {}

        self.quit_callback = _callback_tuple(quit_callback)
        self.data_changed_callback = _callback_tuple(data_changed_callback)

        self.__add_to_app_list__()
        self.__setup_gui__()
        self.__setup_connections__()
        self.load()
        self.title = title
        if window_size:
            self.window_size = window_size
        if window_position:
            self.window_position = window_position
        self.window_decorated = window_decorated


    def __get_gtk_window__(self):
        return self._win


    def __getitem__(self, name):
        w = self.get_widget_by_id(name)
        if isinstance(w, _EGDataWidget):
            return w.get_value()
        else:
            return w


    def __setitem__(self, name, value):
        w = self.get_widget_by_id(name)
        if w is None:
            raise ValueError("Could not find any widget with id=%r" % name)
        elif isinstance(w, _EGDataWidget):
            return w.set_value(value)
        else:
            raise TypeError(
                "Could not set value of widget '%s' of type '%s'." % \
                    (name, type(w).__name__))


    def set_title(self, title):
        self._win.set_title(title)


    def get_title(self):
        return self._win.get_title()

    title = property(get_title, set_title)


    def get_window_size(self):
        return self._win.get_size()


    def set_window_size(self, *args, **kargs):
        """Set window size.

        Parameters are very flexible:
        - one argument with a tuple with (width, height)
        - two integer arguments, being width and height
        - keywords width and height, both with integers
        """
        width = None
        height = None
        if len(args) == 1 and isinstance(args[0], (tuple, list)):
            width, height = args[0]
        elif len(args) == 2:
            width, height = args

        if "width" in kargs:
            width = kargs["width"]
        if "height" in kargs:
            height = kargs["height"]

        if width is None or height is None:
            raise ValueError("Must provide width and height")

        self._win.resize(width, height)

    window_size = property(get_window_size, set_window_size)


    def get_window_position(self):
        return self._win.get_position()


    def set_window_position(self, *args, **kargs):
        """Set window position.

        Parameters are very flexible:
        - one argument with a tuple with (x, y)
        - two integer arguments, being x and y
        - keywords x and y, both with integers
        """
        x = None
        y = None
        if len(args) == 1 and isinstance(args[0], (tuple, list)):
            x, y = args[0]
        elif len(args) == 2:
            x, y = args

        if "x" in kargs:
            x = kargs["x"]
        if "y" in kargs:
            y = kargs["y"]

        if x is None or y is None:
            raise ValueError("Must provide x and y")

        self._win.move(x, y)

    window_position = property(get_window_position, set_window_position)


    def get_window_decorated(self):
        return self._win.get_decorated()


    def set_window_decorated(self, value):
        self._win.set_decorated(bool(value))

    window_decorated = property(get_window_decorated, set_window_decorated)


    def get_widget_by_id(self, widget_id):
        """Return referece to widget with provided id or None if not found."""
        if isinstance(widget_id, _EGWidget) and \
                widget_id in self._widgets.itervalues():
            return widget_id
        else:
            return self._widgets.get(widget_id, None)


    def show_about_dialog(self):
        """Show L{AboutDialog} of this App."""
        diag = AboutDialog(app=self,
                           title=self.title,
                           author=self.author,
                           description=self.description,
                           help=self.help,
                           version=self.version,
                           license=self.license,
                           copyright=self.copyright,
                           )
        diag.run()


    def show_help_dialog(self):
        """Show L{HelpDialog} of this App."""
        diag = HelpDialog(app=self,
                          title=self.title,
                          help=self.help,
                          )
        diag.run()


    def file_chooser(self, action, filename=None,
                     filter=None, multiple=False):
        """Show L{FileChooser} and return selected file(s).

        @param action: must be one of ACTION_* as defined in L{FileChooser}.
        @param filter: a pattern (ie: '*.png'), mime type or a list.

        @see: L{FileChooser}
        """
        diag = FileChooser(app=self, action=action,
                           filename=filename, filter=filter,
                           multiple=multiple)
        return diag.run()


    def show_preferences_dialog(self):
        """Show L{PreferencesDialog} associated with this App."""
        return self._preferences.run()


    def __get_window__(self):
        return self._win


    def __add_to_app_list__(self):
        if not self.id:
            self.id = self.__get_id__()

        if self.id in _apps:
            raise ValueError("App id '%s' already existent!" % self.id)

        _apps[self.id] = self


    def __add_widget__(self, widget):
        if widget.id in self._widgets:
            w = self._widgets[widget.id]
            raise ValueError(("Object id \"%s\" (type: %s) already in "
                              "application \"%s\" as type: %s!") % \
                                 (widget.id,
                                  widget.__class__.__name__,
                                  self.id,
                                  w.__class__.__name__))
        else:
            if widget.app is None:
                self._widgets[widget.id] = widget
                widget.app = self
            elif widget.app != self:
                try:
                    id = widget.app.id
                except:
                    id = widget.app
                raise ValueError(("Object \"%s\" already is in another "
                                  "App: \"%s\"") % \
                                     (widget.id, id))


    def __setup_gui__(self):
        self._win = gtk.Window(gtk.WINDOW_TOPLEVEL)
        self._win.set_name(self.id)
        self._tooltips = gtk.Tooltips()

        self._master_layout = gtk.VBox(False)
        self._master_layout.set_border_width(0)
        self._master_layout.show()
        self._win.add(self._master_layout)

        self.__setup_gui_menu__()
        self.__setup_gui_toolbar__()

        self._top_layout = gtk.VBox(False)
        self._top_layout.set_border_width(self.border_width)
        self._top_layout.show()
        self._master_layout.pack_start(self._top_layout, expand=True,
                                       fill=True)

        self.__setup_gui_left__()
        self.__setup_gui_right__()
        self.__setup_gui_center__()
        self.__setup_gui_top__()
        self.__setup_gui_bottom__()
        self.__setup_gui_preferences__()

        has_top = bool(self._top.children)
        has_bottom = bool(self._bottom.children)
        has_left = bool(self._left.children)
        has_right = bool(self._right.children)
        has_center = bool(self._center.children)

        expand_top = False
        expand_bottom = False
        expand_left = False
        expand_right = False
        expand_center = has_center
        has_hl = has_left or has_center or has_right

        # Left and Right just expand if there is no center
        if has_left and not has_center:
            expand_left = True
        if has_right and not has_center:
            expand_right = True

        # Top and Bottom just expand if there is no center
        if has_top and not has_hl:
            expand_top = True
        if has_bottom and not has_hl:
            expand_bottom = True

        # Create Vertical layout with (TOP | HL | Bottom)
        # where HL is Horizontal layout created before
        if has_top:
            self._top_layout.pack_start(self._top.__get_widgets__()[0],
                                        expand_top, True)
            if has_hl or has_bottom:
                sep = gtk.HSeparator()
                sep.show()
                self._top_layout.pack_start(sep, False, True)

        # Create Horizontal layout with (Left | Center | Right)
        if has_hl:
            self._hbox = gtk.HBox(False)
            self._hbox.show()
            self._top_layout.pack_start(self._hbox, True, True)

            if has_left:
                self._hbox.pack_start(self._left.__get_widgets__()[0],
                                      expand_left, True)
                if has_center or has_right:
                    sep = gtk.VSeparator()
                    sep.show()
                    self._hbox.pack_start(sep, False, True)

            if has_center:
                self._hbox.pack_start(self._center.__get_widgets__()[0],
                                      expand_center, True)
                if has_right:
                    sep = gtk.VSeparator()
                    sep.show()
                    self._hbox.pack_start(sep, False, True)

            if has_right:
                self._hbox.pack_start(self._right.__get_widgets__()[0],
                                      expand_right, True)

            if has_bottom:
                sep = gtk.HSeparator()
                sep.show()
                self._top_layout.pack_start(sep, False, True)


        if has_bottom:
            self._top_layout.pack_start(self._bottom.__get_widgets__()[0],
                                        expand_bottom, True)

        if self.statusbar:
            self._statusbar = gtk.Statusbar()
            self._statusbar.show()
            self._statusbar_ctx = self._statusbar.get_context_id(self.id)
            self._statusbar.set_has_resize_grip(True)
            self._master_layout.pack_end(self._statusbar,
                                         expand=False, fill=True)

        self.__add_widget__(self._left)
        self.__add_widget__(self._right)
        self.__add_widget__(self._center)
        self.__add_widget__(self._top)
        self.__add_widget__(self._bottom)
        self._win.show()

        self.set_visible(self.get_visible())


    def __setup_gui_menu__(self):
        if not self.menu:
            return

        self._menubar = gtk.MenuBar()
        self._master_layout.pack_start(self._menubar, expand=False,
                                       fill=True)
        self._menubar.show()
        for item in self.menu:
            if not isinstance(item, Menu.BaseItem):
                raise ValueError(("menu item should be Menu.BaseItem, "
                                  "but got %s instead!") %
                                 type(item).__name__)
            self._menubar.append(item._wid)
            self.__add_widget__(item)


    def __setup_gui_toolbar__(self):
        if not self.toolbar:
            return

        self._toolbar = gtk.Toolbar()
        self._toolbar_handlebox = gtk.HandleBox()
        self._toolbar_handlebox.add(self._toolbar)
        self._master_layout.pack_start(self._toolbar_handlebox, expand=False,
                                       fill=True)
        for item in self.toolbar:
            if not isinstance(item, Toolbar.BaseItem):
                raise ValueError(("toolbar item should be "
                                  "Toolbar.BaseItem, but got %s "
                                  "instead!") %
                                 type(item).__name__)
            self._toolbar.insert(item._wid, -1)
            self.__add_widget__(item)

        self._toolbar.show()
        self._toolbar_handlebox.show()


    def __setup_gui_left__(self):
        self._left = Group(id="%s:left" % self.id,
                           label=None,
                           border=None,
                           horizontal=False,
                           scrollbars=True,
                           children=self.left)


    def __setup_gui_right__(self):
        self._right = Group(id="%s:right" % self.id,
                            label=None,
                            border=None,
                            horizontal=False,
                            scrollbars=True,
                            children=self.right)


    def __setup_gui_center__(self):
        self._center = Group(id="%s:center" % self.id,
                             label=None,
                             border=None,
                             horizontal=False,
                             scrollbars=True,
                             children=self.center)


    def __setup_gui_top__(self):
        self._top = Group(id="%s:top" % self.id,
                          label=None,
                          border=None,
                          horizontal=True,
                          scrollbars=True,
                          children=self.top)


    def __setup_gui_bottom__(self):
        self._bottom = Group(id="%s:bottom" % self.id,
                             label=None,
                             border=None,
                             horizontal=True,
                             scrollbars=True,
                             children=self.bottom)


    def __setup_gui_preferences__(self):
        self._preferences = PreferencesDialog(self,
                                              children=self.preferences)


    def __setup_connections__(self):
        self._win.connect("delete_event", self.__delete_event__)


    def data_changed(self, widget, value):
        """Notify that widget changed it's value.

        Probably you will not need to call this directly.
        """
        self.save()
        for c in self.data_changed_callback:
            c(self, widget, value)


    def __do_close__(self):
        self.save()

        for c in self.quit_callback:
            if not c(self):
                return False

        del _apps[self.id]
        if not _apps:
            gtk.main_quit()

        return True


    def __delete_event__(self, *args):
        if self.__do_close__():
            return False
        else:
            return True


    def __persistence_filename__(self):
        fname = "%s.save_data" % self.id

        if sys.platform.startswith("win"):
            appdata = os.environ.get("APPDATA", "C:")
            binname = os.path.realpath(sys.argv[0]).replace(":", "")
            d = os.path.join(appdata, "Eagle", binname)
        else:
            home = os.environ.get("HOME", ".")
            binname = os.path.realpath(sys.argv[0])[1 :]
            d = os.path.join(home, ".eagle", binname)

        if not os.path.exists(d):
            os.makedirs(d)

        return os.path.join(d, fname)


    def save(self):
        """Save data from widgets to file.

        Probably you will not need to call this directly.
        """
        d = {}
        for id, w in self._widgets.iteritems():
            if isinstance(w, _EGDataWidget) and w.persistent:
                d[id] = w.get_value()

        if d:
            f = open(self.__persistence_filename__(), "wb")
            pickle.dump(d, f, pickle.HIGHEST_PROTOCOL)
            f.close()


    def load(self):
        """Load data to widgets from file.

        Probably you will not need to call this directly.
        """
        try:
            f = open(self.__persistence_filename__(), "rb")
        except IOError:
            return

        d = pickle.load(f)
        f.close()

        for id, v in d.iteritems():
            try:
                w = self._widgets[id]
            except KeyError:
                w = None
            if isinstance(w, _EGDataWidget) and w.persistent:
                w.set_value(v)


    def close(self):
        """Close application window."""
        if self.__do_close__():
            self._win.destroy()


    def status_message(self, message):
        """Display a message in status bar and retrieve its identifier for
        later removal.

        @see: L{remove_status_message}
        @note: this only active if statusbar=True
        """
        if self.statusbar:
            return self._statusbar.push(self._statusbar_ctx, message)
        else:
            raise ValueError("App '%s' doesn't use statusbar!" % self.id)


    def remove_status_message(self, message_id):
        """Remove a previously displayed message.

        @see: L{status_message}
        @note: this only active if statusbar=True
        """
        if self.statusbar:
            self._statusbar.remove(self._statusbar_ctx, message_id)
        else:
            raise ValueError("App '%s' doesn't use statusbar!" % self.id)


    def timeout_add(self, interval, callback, *args, **kargs):
        """Register a function to be called after a given timeout/interval.

        @param interval: milliseconds between calls.
        @param callback: function to call back. This function gets as
        argument the app reference and must return C{True} to
        keep running, if C{False} is returned, it will not be
        called anymore.
        @return: id number to be used in L{remove_event_source}
        """
        def wrap(*a):
            return callback(self, *args, **kargs)
        return gobject.timeout_add(interval, wrap)


    def idle_add(self, callback, *args, **kargs):
        """Register a function to be called when system is idle.

        System is idle if there is no other event pending.

        @param callback: function to call back. This function gets as
        argument the app reference and must return C{True} to
        keep running, if C{False} is returned, it will not be
        called anymore.
        @return: id number to be used in L{remove_event_source}
        """
        def wrap(*a):
            return callback(self, *args, **kargs)
        return gobject.idle_add(wrap)



    def io_watch(self, file, callback,
                 on_in=False, on_out=False, on_urgent=False, on_error=False,
                 on_hungup=False, *args, **kargs):
        """Register a function to be called after an Input/Output event.

        @param file: any file object or file descriptor (integer).
        @param callback: function to be called back, parameters will be the
        application that generated the event, the file that triggered
        it and on_in, on_out, on_urgent, on_error or on_hungup,
        being True those that triggered the event.
        The function must return C{True} to be called back again,
        otherwise it is automatically removed.
        @param on_in: there is data to read.
        @param on_out: data can be written without blocking.
        @param on_urgent: there is urgent data to read.
        @param on_error: error condition.
        @param on_hungup: hung up (the connection has been broken, usually for
        pipes and sockets).
        @return: id number to be used in L{remove_event_source}
        """
        def wrap(source, cb_condition):
            on_in     = bool(cb_condition & gobject.IO_IN)
            on_out    = bool(cb_condition & gobject.IO_OUT)
            on_urgent = bool(cb_condition & gobject.IO_PRI)
            on_error  = bool(cb_condition & gobject.IO_ERR)
            on_hungup = bool(cb_condition & gobject.IO_HUP)
            return callback(self, source, on_in=on_in,
                            on_out=on_out, on_urgent=on_urgent,
                            on_error=on_error, on_hungup=on_hungup,
                            *args, **kargs)

        condition = 0
        if on_in:
            condition |= gobject.IO_IN
        if on_out:
            condition |= gobject.IO_OUT
        if on_urgent:
            condition |= gobject.IO_PRI
        if on_error:
            condition |= gobject.IO_ERR
        if on_hungup:
            condition |= gobject.IO_HUP
        return gobject.io_add_watch(file, condition, wrap)


    def remove_event_source(self, event_id):
        """Remove an event generator like those created by L{timeout_add},
        L{idle_add} or L{io_watch}.

        @param event_id: value returned from L{timeout_add},
        L{idle_add} or L{io_watch}.

        @return: C{True} if it was removed.
        """
        return gobject.source_remove(event_id)


    def set_visible(self, visible=True):
        if visible:
            self.show()
        else:
            self.hide()

    def get_visible(self):
        return self._visible
    is_visible = get_visible


    def show(self):
        self._visible = True
        self._win.show()


    def hide(self):
        self._visible = False
        self._win.hide()


class Canvas(_EGWidget):
    """The drawing area.

    Eagle's drawing area (Canvas) is provided with a frame and an optional
    label, together with scrollbars, to make it fit everywhere.

    """
    padding = 5
    bgcolor= "black"

    LEFT = -1
    CENTER = 0
    RIGHT = 1

    FONT_OPTION_BOLD       = 1
    FONT_OPTION_OBLIQUE    = 2
    FONT_OPTION_ITALIC     = 4

    FONT_NAME_NORMAL       = "normal"
    FONT_NAME_SERIF        = "serif"
    FONT_NAME_SANS         = "sans"
    FONT_NAME_MONO         = "monospace"

    MOUSE_BUTTON_1         = 1
    MOUSE_BUTTON_2         = 2
    MOUSE_BUTTON_3         = 4
    MOUSE_BUTTON_4         = 8
    MOUSE_BUTTON_5         = 16

    label = _gen_ro_property("label")

    def __init__(self, id, width, height, label="", bgcolor=None,
                 scrollbars=True, callback=None, resize_callback=None,
                 expand_policy=None, active=True, visible=True):
        """Canvas Constructor.

        @param id: unique identifier.
        @param width: width of the drawing area in pixels, widget can be
        larger or smaller because and will use scrollbars if need.
        @param height: height of the drawing area in pixels, widget can be
        larger or smaller because and will use scrollbars if need.
        @param label: label to display in the widget frame around the
        drawing area. If None, no label or frame will be shown.
        @param bgcolor: color to paint background.
        @param scrollbars: whenever to use scrollbars and make canvas
        fit small places.
        @param callback: function (or list of functions) to call when
        mouse state changed in the drawing area. Function will get
        as parameters:
        - App reference
        - Canvas reference
        - Button state (or'ed MOUSE_BUTTON_*)
        - horizontal positon (x)
        - vertical positon (y)
        @param resize_callback: function (or list of functions) to call
        when size available to canvas changed. Function will get
        as parameters:
        - App reference
        - Canvas reference
        - New width
        - New height
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.

        @todo: honor the alpha value while drawing colors.
        """
        _EGWidget.__init__(self, id, expand_policy=expand_policy,
                           active=active, visible=visible)
        self.__label = label
        self.width = width
        self.height = height
        self.scrollbars = scrollbars

        self._pixmap = None
        self._callback = _callback_tuple(callback)
        self._resize_callback = _callback_tuple(resize_callback)

        # style and color context must be set just after drawing area is
        # attached to a window, otherwise they'll be empty and useless.
        # This is done in configure_event.
        self._fg_gc_normal = None

        if bgcolor is not None:
            self.bgcolor = self.__color_from__(bgcolor)

        self.__setup_gui__(width, height)
        self.__setup_connections__()


    def __setup_gui__(self, width, height):
        self._sw = gtk.ScrolledWindow()
        self._area = gtk.DrawingArea()

        self._sw.set_border_width(self.padding)

        if self.label is not None:
            self._frame = gtk.Frame(self.label)
            self._frame.add(self._sw)
            self._frame.set_shadow_type(gtk.SHADOW_OUT)
            root = self._frame
        else:
            root = self._sw

        self._area.set_size_request(width, height)
        self._sw.add_with_viewport(self._area)
        if self.scrollbars:
            policy = gtk.POLICY_AUTOMATIC
            border = gtk.SHADOW_IN
        else:
            policy = gtk.POLICY_NEVER
            border = gtk.SHADOW_NONE

        self._sw.set_policy(hscrollbar_policy=policy,
                            vscrollbar_policy=policy)
        self._sw.child.set_shadow_type(border)
        self._sw.show_all()

        self._widgets = (root,)


    def __setup_connections__(self):
        def size_allocate(widget, geometry):
            if not (self.app and self.app.__get_gtk_window__() and \
                        self.app.__get_gtk_window__().window):
                return
            x, y, w, h = list(geometry)
            for c in self._resize_callback:
                c(self.app, self, w, h)
        self._sw.child.connect("size-allocate", size_allocate)

        def configure_event(widget, event):
            if not self._pixmap:
                self.__setup_canvas__()
            return True
        self._area.connect("configure_event", configure_event)


        def expose_event(widget, event):
            x , y, width, height = event.area
            gc = widget.get_style().fg_gc[gtk.STATE_NORMAL]
            widget.window.draw_drawable(gc, self._pixmap, x, y, x, y,
                                        width, height)
            return False
        self._area.connect("expose_event", expose_event)


        def get_buttons(state):
            buttons = 0
            if state & gtk.gdk.BUTTON1_MASK:
                buttons |= self.MOUSE_BUTTON_1
            if state & gtk.gdk.BUTTON2_MASK:
                buttons |= self.MOUSE_BUTTON_2
            if state & gtk.gdk.BUTTON3_MASK:
                buttons |= self.MOUSE_BUTTON_3
            if state & gtk.gdk.BUTTON4_MASK:
                buttons |= self.MOUSE_BUTTON_4
            if state & gtk.gdk.BUTTON5_MASK:
                buttons |= self.MOUSE_BUTTON_5
            return buttons

        buttons_map = {
            1: self.MOUSE_BUTTON_1,
            2: self.MOUSE_BUTTON_2,
            3: self.MOUSE_BUTTON_3,
            4: self.MOUSE_BUTTON_4,
            5: self.MOUSE_BUTTON_5,
            }

        def button_press_event(widget, event):
            if self._pixmap != None:
                btns = get_buttons(event.state)
                btns |= buttons_map[event.button]

                x = int(event.x)
                y = int(event.y)

                for c in self._callback:
                    c(self.app, self, btns, x, y)
            return True
        if self._callback:
            self._area.connect("button_press_event", button_press_event)


        def button_release_event(widget, event):
            if self._pixmap != None:
                btns = get_buttons(event.state)
                btns &= ~buttons_map[event.button]

                x = int(event.x)
                y = int(event.y)

                for c in self._callback:
                    c(self.app, self, btns, x, y)
            return True
        if self._callback:
            self._area.connect("button_release_event", button_release_event)


        def motion_notify_event(widget, event):
            if self._pixmap is None:
                return True

            if event.is_hint:
                x, y, state = event.window.get_pointer()
            else:
                x = event.x
                y = event.y
                state = event.state


            btns = get_buttons(state)
            x = int(x)
            y = int(y)

            if btns:
                for c in self._callback:
                    c(self.app, self, btns, x, y)

            return True
        if self._callback:
            self._area.connect("motion_notify_event", motion_notify_event)


        # Enable events
        self._area.set_events(gtk.gdk.EXPOSURE_MASK |
                              gtk.gdk.LEAVE_NOTIFY_MASK |
                              gtk.gdk.BUTTON_PRESS_MASK |
                              gtk.gdk.BUTTON_RELEASE_MASK |
                              gtk.gdk.POINTER_MOTION_MASK |
                              gtk.gdk.POINTER_MOTION_HINT_MASK)


    def __setup_canvas__(self):
        self.resize(self.width, self.height)
        self._fg_gc_normal = self._pixmap.new_gc()


    def _get_app(self):
        try:
            return self.__ro_app
        except AttributeError:
            return None

    def _set_app(self, value):
        # We need to overload app setter in order to get
        # gdk.window from app and do resize()
        try:
            v = self.__ro_app
        except AttributeError:
            v = None
        if v is None:
            self.__ro_app = value
            def app_realize(app):
                self.__setup_canvas__()
            value.__get_gtk_window__().connect("realize", app_realize)
        else:
            raise Exception("Read Only property 'app'.")
    app = property(_get_app, _set_app)


    def __color_from__(color):
        """Convert from color to internal representation.

        Gets a string, integer or tuple/list arguments and converts into
        internal color representation.
        """
        a = 255

        if isinstance(color, str):
            try:
                c = gtk.gdk.color_parse(color)
                r = int(c.red   / 65535.0 * 255)
                g = int(c.green / 65535.0 * 255)
                b = int(c.blue  / 65535.0 * 255)
            except ValueError, e:
                raise ValueError("%s. color=%r" % (e, color))
        elif isinstance(color, gtk.gdk.Color):
            r = int(color.red   / 65535.0 * 255)
            g = int(color.green / 65535.0 * 255)
            b = int(color.blue  / 65535.0 * 255)
        elif isinstance(color, int):
            r = (color >> 16) & 0xff
            g = (color >>  8) & 0xff
            b = (color & 0xff)
        elif isinstance(color, (tuple, list)):
            if len(color) == 3:
                r, g, b = color
            else:
                a, r, g, b = color
        else:
            raise ValueError("Color not supported %r" % color)

        return a, r, g, b
    __color_from__ = staticmethod(__color_from__)


    def __to_gtk_color__(color):
        r = int(color[1] / 255.0 * 65535)
        g = int(color[2] / 255.0 * 65535)
        b = int(color[3] / 255.0 * 65535)
        return gtk.gdk.Color(r, g, b)
    __to_gtk_color__ = staticmethod(__to_gtk_color__)


    def __configure_gc__(self, fgcolor=None, bgcolor=None, fill=None,
                         line_width=None, line_style=None):
        if fgcolor is not None:
            fgcolor = self.__color_from__(fgcolor)
        if bgcolor is not None:
            bgcolor = self.__color_from__ (bgcolor)

        k = {}
        if fill is not None:
            k["fill"] = gtk.gdk.SOLID
        if line_width is not None:
            k["line_width"] = line_width
        if line_style is not None:
            k["line_style"] = line_style

        gc = self._pixmap.new_gc(**k)

        if fgcolor is not None:
            gc.set_rgb_fg_color(self.__to_gtk_color__(fgcolor))
        if bgcolor is not None:
            gc.set_rgb_bg_color(self.__to_gtk_color__(bgcolor))
        return gc


    def resize(self, width, height):
        """Resize the drawing area."""
        old = self._pixmap
        self.width = width
        self.height = height
        gdk_window = self.app.__get_gtk_window__().window
        self._pixmap = gtk.gdk.Pixmap(gdk_window, width, height)
        self.clear()
        if old is not None:
            # copy old contents over this
            w, h = old.get_size()
            self._pixmap.draw_drawable(self._fg_gc_normal, old,
                                       0, 0, 0, 0, w, h)


    def draw_image(self, image, x=0, y=0,
                   width=None, height=None,
                   src_x=0, src_y=0):
        """Draw image on canvas.

        By default it draws entire image at top canvas corner.

        You may restrict which image areas to use with src_x, src_y, width
        and height.

        You may choose position on canvas with x and y.
        """
        if not isinstance(image, Image):
            raise TypeError(("image must be instance of Image class, "
                             "but %s found!") % (type(image).__name__))

        p = image.__get_gtk_pixbuf__()

        if src_x >= p.get_width():
            raise ValueError("src_x is greater or equal width!")

        if src_y >= p.get_height():
            raise ValueError("src_y is greater or equal height!")

        if width is None or width < 1:
            width = p.get_width()

        if height is None or height < 1:
            height = p.get_height()

        if src_x + width > p.get_width():
            width = p.get_width() - src_x
        if src_y + height > p.get_height():
            height = p.get_height() - src_y

        self._pixmap.draw_pixbuf(self._fg_gc_normal,
                                 p, src_x, src_y, x, y, width, height)
        self._area.queue_draw_area(x, y, width, width)


    def draw_text(self, text, x=0, y=0,
                  fgcolor=None, bgcolor=None,
                  font_name=None, font_size=None, font_options=0,
                  font_family=None,
                  width=None, wrap_word=False,
                  alignment=LEFT, justify=True):
        """Draw text on canvas.

        By default text is draw with current font and colors at top canvas
        corner.

        You may limit width providing a value and choose if it should wrap
        at words (wrap_word=True) or characters (wrap_word=False).


        Colors can be specified with fgcolor an bgcolor. If not provided, the
        system foreground color is used and no background color is used.

        Font name, family, size and options may be specified using
        font_name, font_family, font_size and font_options, respectively.
        Try to avoid using system specific font fames, use those provided
        by FONT_NAME_*.

        Font options is OR'ed values from FONT_OPTIONS_*.

        Font name is a string that have all the information, like
        "sans bold 12". This is returned by L{Font}.

        Text alignment is one of LEFT, RIGHT or CENTER.
        """
        if fgcolor is not None:
            fgcolor = self.__to_gtk_color__(self.__color_from__(fgcolor))
        if bgcolor is not None:
            bgcolor = self.__to_gtk_color__(self.__color_from__(bgcolor))

        layout = self._area.create_pango_layout(text)
        if width is not None:
            layout.set_width(width * pango.SCALE)
            if wrap_word:
                layout.set_wrap(pango.WRAP_WORD)

        layout.set_justify(justify)
        alignment = {self.LEFT: pango.ALIGN_LEFT,
                     self.CENTER: pango.ALIGN_CENTER,
                     self.RIGHT: pango.ALIGN_RIGHT}.get(alignment,
                                                        pango.ALIGN_CENTER)
        layout.set_alignment(alignment)

        if font_name or font_size or font_options or font_family:
            if font_name:
                fd = pango.FontDescription(font_name)
            else:
                fd = layout.get_context().get_font_description()

            if font_size:
                fd.set_size(font_size * pango.SCALE)
            if font_options:
                if font_options & self.FONT_OPTION_BOLD:
                    fd.set_weight(pango.WEIGHT_BOLD)
                if font_options & self.FONT_OPTION_ITALIC:
                    fd.set_style(pango.STYLE_ITALIC)
                if font_options & self.FONT_OPTION_OBLIQUE:
                    fd.set_style(pango.STYLE_OBLIQUE)
            layout.set_font_description(fd)

        self._pixmap.draw_layout(self._fg_gc_normal, x, y, layout,
                                 fgcolor, bgcolor)
        w, h = layout.get_pixel_size()
        self._area.queue_draw_area(x, y, w, h)



    def draw_point(self, x, y, color=None):
        """Draw point."""
        gc = self.__configure_gc__(fgcolor=color)
        self._pixmap.draw_point(gc, x, y)
        self._area.queue_draw_area(x, y, 1, 1)


    def draw_points(self, points, color=None):
        """Draw points.

        Efficient way to draw more than one point with the same
        characteristics.
        """
        gc = self.__configure_gc__(fgcolor=color)
        self._pixmap.draw_points(gc, points)
        w, h = self._pixmap.get_size()
        self._area.queue_draw_area(0, 0, w, h)


    def draw_line(self, x0, y0, x1, y1, color=None, size=1):
        """Draw line."""
        gc = self.__configure_gc__(fgcolor=color, line_width=size)
        self._pixmap.draw_line(gc, x0, y0, x1, y1)

        size2 = size * 2

        w, h = abs(x1 - x0) + size2, abs(y1 - y0) + size2
        x, y = max(min(x0, x1) - size, 0), max(min(y0, y1) - size, 0)
        self._area.queue_draw_area(x, y, w, h)


    def draw_segments(self, segments, color=None, size=1):
        """Draw line segments.

        Efficient way to draw more than one line with the same
        characteristics.

        Lines are not connected, use L{draw_lines} instead.
        """
        gc = self.__configure_gc__(fgcolor=color, line_width=size)
        self._pixmap.draw_segments(gc, segments)
        w, h = self._pixmap.get_size()
        self._area.queue_draw_area(0, 0, w, h)


    def draw_lines(self, points, color=None, size=1):
        """Draw lines connecting points.

        Points are connected using lines, but first and last points
        are not connected, use L{draw_polygon} instead.
        """
        gc = self.__configure_gc__(fgcolor=color, line_width=size)
        self._pixmap.draw_lines(gc, points)
        w, h = self._pixmap.get_size()
        self._area.queue_draw_area(0, 0, w, h)


    def draw_rectangle(self, x, y, width, height, color=None, size=1,
                       fillcolor=None, filled=False):
        """Draw rectagle.

        If L{filled} is C{True}, it will be filled with L{fillcolor}.

        If L{color} is provided, it will draw the rectangle's frame, even
        if L{filled} is C{True}.
        """
        if filled:
            gc = self.__configure_gc__(fgcolor=fillcolor, fill=filled)
            self._pixmap.draw_rectangle(gc, True, x, y, width, height)

        if size > 0:
            gc = self.__configure_gc__(fgcolor=color, line_width=size)
            self._pixmap.draw_rectangle(gc, False, x, y, width, height)
        else:
            size = 0

        half = size / 2
        self._area.queue_draw_area(x-half, y-half, width+size, height+size)


    def draw_arc(self, x, y, width, height, start_angle, end_angle,
                 color=None, size=1, fillcolor=None, filled=False):
        """Draw arc on canvas.

        Arc will be the part of an ellipse that starts at (L{x}, L{y})
        and have size of L{width}xL{height}.

        L{start_angle} and L{end_angle} are in radians, starts from the
        positive x-axis and are counter-clockwise.

        If L{filled} is C{True}, it will be filled with L{fillcolor}.

        If L{color} is provided, it will draw the arc's frame, even
        if L{filled} is C{True}. Frame here is just the curve, not the
        straight lines that are limited by L{start_angle} and L{end_angle}.
        """
        # GTK: angles are in 1/64 of degree and must be integers
        mult = 180.0 / 3.1415926535897931 * 64.0
        start_angle = int(mult * start_angle)
        end_angle = int(mult * end_angle)

        if filled:
            gc = self.__configure_gc__(fgcolor=fillcolor, fill=filled)
            self._pixmap.draw_arc(gc, True, x, y, width, height,
                                  start_angle, end_angle)
        if size > 0:
            gc = self.__configure_gc__(fgcolor=color, line_width=size)
            self._pixmap.draw_arc(gc, False, x, y, width, height,
                                  start_angle, end_angle)
        else:
            size = 0

        half = size / 2
        self._area.queue_draw_area(x-half, y-half, width+size, height+size)


    def draw_polygon(self, points, color=None, size=1,
                     fillcolor=None, filled=False):
        """Draw polygon on canvas.

        If L{filled} is C{True}, it will be filled with L{fillcolor}.

        If L{color} is provided, it will draw the polygon's frame, even
        if L{filled} is C{True}.
        """
        if filled:
            gc = self.__configure_gc__(fgcolor=fillcolor, fill=filled)
            self._pixmap.draw_polygon(gc, True, points)

        if size > 0:
            gc = self.__configure_gc__(fgcolor=color, line_width=size)
            self._pixmap.draw_polygon(gc, False, points)
        else:
            size = 0

        w, h = self._pixmap.get_size()
        self._area.queue_draw_area(0, 0, w, h)


    def clear(self):
        """Clear using bgcolor."""
        self.fill(self.bgcolor)


    def fill(self, color):
        w, h = self.get_size()
        self.draw_rectangle(0, 0, w, h, color, size=0, fillcolor=color,
                            filled=True)


    def get_size(self):
        return self._pixmap.get_size()


    def get_image(self):
        """Get the L{Image} that represents this drawing area."""
        w, h = self._pixmap.get_size()
        img = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, True, 8, w, h)
        img.get_from_drawable(self._pixmap, self._area.get_colormap(),
                              0, 0, 0, 0, w, h)
        return Image(__int_image__=img)


    def set_label(self, label):
        if self.__label is None:
            raise ValueError("You cannot change label of widget created "
                             "without one. Create it with placeholder! "
                             "(label='')")
        self.__label = label
        self._frame.set_label(self.__label)


    def get_label(self):
        return self.__label

    label = property(get_label, set_label)


    def __str__(self):
        return "%s(id=%r, width=%r, height=%r, label=%r)" % \
            (self.__class__.__name__, self.id, self.width, self.height,
             self.label)
    __repr__ = __str__


class _MultiLineEntry(gtk.ScrolledWindow):
    def __init__(self):
        gtk.ScrolledWindow.__init__(self)
        self.set_policy(hscrollbar_policy=gtk.POLICY_AUTOMATIC,
                        vscrollbar_policy=gtk.POLICY_AUTOMATIC)
        self.set_shadow_type(gtk.SHADOW_IN)

        self.textview = gtk.TextView()
        self.textview.show()
        self.add(self.textview)

        self.textview.set_editable(True)
        self.textview.set_cursor_visible(True)
        self.textview.set_left_margin(2)
        self.textview.set_right_margin(2)
        self.textview.get_buffer().connect("changed", self.__emit_changed__)


    def __emit_changed__(self, *args):
        self.emit("changed")


    def set_text(self, value):
        self.textview.get_buffer().set_text(value)


    def get_text(self):
        b = self.textview.get_buffer()
        return b.get_text(b.get_start_iter(), b.get_end_iter())


    def set_editable(self, setting):
        self.textview.set_editable(setting)
gobject.signal_new("changed",
                   _MultiLineEntry,
                   gobject.SIGNAL_RUN_LAST,
                   gobject.TYPE_NONE,
                   tuple())


class Entry(_EGWidLabelEntry):
    """Text entry.

    The simplest user input component. Its contents are free-form and not
    filtered/masked.
    """
    value = _gen_ro_property("value")
    callback = _gen_ro_property("callback")
    multiline = _gen_ro_property("multiline")


    def __init__(self, id, label="", value="", callback=None,
                 editable=True, persistent=False, multiline=False,
                 expand_policy=None, active=True, visible=True):
        """Entry constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial content.
        @param editable: if this field is editable by user.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param multiline: if this entry can be multi-line.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.value = value
        self.callback = _callback_tuple(callback)
        self.multiline = bool(multiline)
        self._editable = editable

        if expand_policy is None:
            if self.multiline:
                p = ExpandPolicy.All()
            else:
                p = ExpandPolicy.Horizontal()

            expand_policy = (ExpandPolicy.Fill(), p)

        _EGWidLabelEntry.__init__(self, id, persistent, label,
                                  expand_policy=expand_policy,
                                  active=active, visible=visible)

        self.__setup_gui__()
        self.__setup_connections__()


    def __setup_gui__(self):
        if self.multiline:
            self._entry = _MultiLineEntry()
        else:
            self._entry = gtk.Entry()

        self._entry.set_name(self.id)
        self._entry.set_text(self.value)
        self.set_editable(self._editable)

        _EGWidLabelEntry.__setup_gui__(self)


    def __configure_orientation__(self, setting):
        super(Entry, self).__configure_orientation__(setting)
        if self.multiline and self.label and \
                setting == self.ORIENTATION_VERTICAL:
            self._label.set_alignment(xalign=1.0, yalign=0)


    def __setup_connections__(self):
        def callback(obj, *args):
            v = self.get_value()
            self.app.data_changed(self, v)
            for c in self.callback:
                c(self.app, self, v)
        self._entry.connect("notify::text", callback)


    def get_value(self):
        return self._entry.get_text()


    def set_value(self, value):
        self._entry.set_text(str(value))


    def set_editable(self, value):
        self._editable = bool(value)
        self._entry.set_editable(self._editable)


    def get_editable(self):
        return self._editable

    editable = property(get_editable, set_editable)


class Password(Entry):
    """Password entry.

    Like L{Entry}, but will show '*' instead of typed chars.
    """
    def __init__(self, id, label="", value="", callback=None,
                 editable=True, persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Password constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial content.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param editable: if this field is editable by user.
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        Entry.__init__(self, id, label, value, callback, editable, persistent,
                       expand_policy=expand_policy,
                       active=active, visible=visible)
        self._entry.set_visibility(False)


class Spin(_EGWidLabelEntry):
    """Spin button entry.

    Spin buttons are numeric user input that checks if value is inside
    a specified range. It also provides small buttons to help incrementing/
    decrementing value.
    """
    default_min = -1e60
    default_max =  1e60

    value = _gen_ro_property("value")
    min = _gen_ro_property("min")
    max = _gen_ro_property("max")
    step = _gen_ro_property("step")
    digits = _gen_ro_property("digits")

    callback = _gen_ro_property("callback")

    def __init__(self, id, label="",
                 value=None, min=None, max=None, step=None, digits=3,
                 callback=None, persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Spin constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial content.
        @param min: minimum value. If None, L{default_min} will be used.
        @param max: maximum value. If None, L{default_max} will be used.
        @param step: step to use to decrement/increment using buttons.
        @param digits: how many digits to show.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.value = value
        self.min = min
        self.max = max
        self.step = step
        self.digits = digits
        self.callback = _callback_tuple(callback)

        _EGWidLabelEntry.__init__(self, id, persistent, label,
                                  expand_policy=expand_policy,
                                  active=active, visible=visible)

        self.__setup_connections__()


    def __setup_gui__(self):
        k = {}

        if self.value is not None:
            k["value"] = self.value

        if self.min is not None:
            k["lower"] = self.min
        else:
            k["lower"] = self.default_min

        if self.max is not None:
            k["upper"] = self.max
        else:
            k["upper"] = self.default_max

        if self.step is not None:
            k["step_incr"] = self.step
            k["page_incr"] = self.step * 2
        else:
            k["step_incr"] = 1
            k["page_incr"] = 2

        adj = gtk.Adjustment(**k)
        self._entry = gtk.SpinButton(adjustment=adj, digits=self.digits)
        self._entry.set_name(self.id)
        self._entry.set_numeric(True)
        self._entry.set_snap_to_ticks(False)

        _EGWidLabelEntry.__setup_gui__(self)


    def __setup_connections__(self):
        def callback(obj, *args):
            v = self.get_value()
            self.app.data_changed(self, v)
            for c in self.callback:
                c(self.app, self, v)
        self._entry.connect("notify::value", callback)


    def set_value(self, value):
        self._entry.set_value(float(value))


class IntSpin(Spin):
    """Integer-only Spin button.

    Convenience widget that behaves like L{Spin} with digits set to
    zero and also ensure L{set_value} and L{get_value} operates on
    integers.
    """
    default_min = -sys.maxint
    default_max =  sys.maxint

    def __init__(self, id, label="",
                 value=None, min=None, max=None, step=None,
                 callback=None, persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Integer Spin constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial content.
        @param min: minimum value. If None, L{default_min} will be used.
        @param max: maximum value. If None, L{default_max} will be used.
        @param step: step to use to decrement/increment using buttons.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        if value is not None:
            value = int(value)
        if min is not None:
            min = int(min)
        if max is not None:
            max = int(max)
        if step is not None:
            step = int(step)
        Spin.__init__(self, id, label, value, min, max, step, 0, callback,
                      persistent, expand_policy=expand_policy,
                      active=active, visible=visible)


    def get_value(self):
        return int(Spin.get_value(self))


    def set_value(self, value):
        Spin.set_value(self, int(value))


class UIntSpin(IntSpin):
    """Unsigned integer-only Spin button.

    Convenience widget that behaves like L{IntSpin} with minimum value
    always greater or equal zero.
    """
    default_min = 0

    def __init__(self, id, label="",
                 value=None, min=0, max=None, step=None,
                 callback=None, persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Unsigned Integer Spin constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial content.
        @param min: minimum value, must be greater or equal zero.
        @param max: maximum value. If None, L{default_max} will be used.
        @param step: step to use to decrement/increment using buttons.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        if min < 0:
            raise ValueError("UIntSpin cannot have min < 0!")
        Spin.__init__(self, id, label, value, min, max, step, 0, callback,
                      persistent, expand_policy=expand_policy,
                      active=active, visible=visible)


class Slider(_EGWidLabelEntry):
    """Slider to select from a range."""

    POS_LEFT = 0
    POS_RIGHT = 1
    POS_TOP = 2
    POS_BOTTOM = 3
    POS_NONE = None
    POS_AUTO = -1

    default_min = -1e60
    default_max =  1e60

    value = _gen_ro_property("value")
    min = _gen_ro_property("min")
    max = _gen_ro_property("max")
    step = _gen_ro_property("step")
    digits = _gen_ro_property("digits")
    value_pos = _gen_ro_property("value_pos")
    horizontal = _gen_ro_property("horizontal")

    callback = _gen_ro_property("callback")

    def __init__(self, id, label="", value=None, min=None, max=None,
                 step=None, digits=3, value_pos=POS_AUTO,
                 horizontal=True, callback=None, persistent=False,
                 expand_policy=None, active=True, visible=True):
        """Slider constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial content.
        @param min: minimum value. If None, L{default_min} will be used.
        @param max: maximum value. If None, L{default_max} will be used.
        @param step: step to use to decrement/increment using buttons.
        @param digits: how many digits to show.
        @param value_pos: where to display value, one of POS_LEFT, POS_RIGHT,
        POS_TOP, POS_BOTTOM, POS_NONE or POS_AUTO.
        @param horizontal: whenever to use horizontal or vertical slider.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.value = value
        self.min = min
        self.max = max
        self.step = step
        self.value_pos = value_pos
        self.digits = digits
        self.horizontal = bool(horizontal)
        self.callback = _callback_tuple(callback)

        _EGWidLabelEntry.__init__(self, id, persistent, label,
                                  expand_policy=expand_policy,
                                  active=active, visible=visible)

        self.__setup_connections__()


    def __setup_gui__(self):
        k = {}

        if self.value is not None:
            k["value"] = self.value

        if self.min is not None:
            k["lower"] = self.min
        else:
            k["lower"] = self.default_min

        if self.max is not None:
            k["upper"] = self.max
        else:
            k["upper"] = self.default_max

        if self.step is not None:
            k["step_incr"] = self.step
            k["page_incr"] = self.step * 2
        else:
            k["step_incr"] = 1
            k["page_incr"] = 2

        adj = gtk.Adjustment(**k)
        if self.horizontal:
            self._entry = gtk.HScale(adj)
        else:
            self._entry = gtk.VScale(adj)

        self._entry.set_digits(self.digits)
        self._entry.set_name(self.id)

        if self.value_pos == Slider.POS_LEFT:
            self._entry.set_value_pos(gtk.POS_LEFT)
        elif self.value_pos == Slider.POS_RIGHT:
            self._entry.set_value_pos(gtk.POS_RIGHT)
        elif self.value_pos == Slider.POS_TOP:
            self._entry.set_value_pos(gtk.POS_TOP)
        elif self.value_pos == Slider.POS_BOTTOM:
            self._entry.set_value_pos(gtk.POS_BOTTOM)
        elif self.value_pos == Slider.POS_NONE:
            self._entry.set_draw_value(False)

        _EGWidLabelEntry.__setup_gui__(self)


    def __setup_connections__(self):
        def callback(obj, *args):
            v = self.get_value()
            self.app.data_changed(self, v)
            for c in self.callback:
                c(self.app, self, v)
        self._entry.connect("value-changed", callback)


    def set_value(self, value):
        self._entry.set_value(float(value))


    def get_range(self):
        adj = self._entry.get_adjustment()
        min = adj.get_property("lower")
        max = adj.get_property("upper")
        return (min, max)


    def set_range(self, min, max):
        self._entry.set_range(float(min), float(max))


    def get_increments(self):
        adj = self._entry.get_adjustment()
        step = adj.get_property("step-increment")
        page_step = adj.get_property("page-increment")
        return (step, page_step)


    def set_increments(self, step, page_step=None):
        step = float(step)
        if page_step is None:
            page_step = step * 10.0
        else:
            page_step = float(page_step)
        self._entry.set_increments(step, page_step)


class Color(_EGWidLabelEntry):
    """Button to select colors.

    It show current/last selected color and may pop-up a new dialog to
    select a new one.
    """
    color = _gen_ro_property("color")
    use_alpha = _gen_ro_property("use_alpha")
    callback = _gen_ro_property("callback")

    def __init__(self, id, label="", color=0, use_alpha=False,
                 callback=None, persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Color selector constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param color: initial content. May be a triple with elements within
        the range 0-255, an string with color in HTML format or even
        a color present in X11's rgb.txt.
        @param use_alpha: if the alpha channel should be used, it will be
        the first value in the tuple representing the color.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.color = self.color_from(color)
        self.use_alpha = use_alpha
        self.callback = _callback_tuple(callback)
        _EGWidLabelEntry.__init__(self, id, persistent, label,
                                  expand_policy=expand_policy,
                                  active=active, visible=visible)

        self.__setup_connections__()


    def color_from(color):
        a = 255
        if isinstance(color, str):
            try:
                c = gtk.gdk.color_parse(color)
                r = int(c.red / 65535.0 * 255)
                g = int(c.green / 65535.0 * 255)
                b = int(c.blue / 65535.0 * 255)
            except ValueError, e:
                raise ValueError("%s. color=%r" % (e, color))

        if isinstance(color, int):
            r = (color >> 16) & 0xff
            g = (color >>  8) & 0xff
            b = (color & 0xff)
        elif isinstance(color, (tuple, list)):
            if len(color) == 3:
                r, g, b = color
            else:
                a, r, g, b = color

        return a, r, g, b
    color_from = staticmethod(color_from)


    def __setup_gui__(self):
        r = int(self.color[1] / 255.0 * 65535)
        g = int(self.color[2] / 255.0 * 65535)
        b = int(self.color[3] / 255.0 * 65535)

        c = gtk.gdk.Color(r, g, b)

        self._entry = gtk.ColorButton(c)
        self._entry.set_name(self.id)
        self._entry.set_use_alpha(self.use_alpha)
        if self.use_alpha:
            alpha = int(self.color[0] / 255.0 * 65535)
            self._entry.set_alpha(alpha)
        _EGWidLabelEntry.__setup_gui__(self)


    def __setup_connections__(self):
        def callback(obj):
            v = self.get_value()
            self.app.data_changed(self, v)
            for c in self.callback:
                c(self.app, self, v)
        self._entry.connect("color-set", callback)


    def get_value(self):
        """Return a tuple with (alpha, red, green, blue)
        (alpha, red, green, blue) (use_alpha=True), each in 0-255 range.
        """
        c = self._entry.get_color()
        r = int(c.red   / 65535.0 * 255)
        g = int(c.green / 65535.0 * 255)
        b = int(c.blue  / 65535.0 * 255)

        if self.use_alpha:
            a = int(self._entry.get_alpha() / 65535.0 * 255)
            return (a, r, g, b)
        else:
            return (r, g, b)


    def set_value(self, value):
        """
        @param value: May be a triple with elements within
        the range 0-255, an string with color in HTML format or even
        a color present in X11's rgb.txt.
        """
        a, r, g, b = self.color_from(value)
        if self.use_alpha:
            self._entry.set_alpha(int(a / 255.0 * 65535.0))

        r = int(r / 255.0 * 65535)
        g = int(g / 255.0 * 65535)
        b = int(b / 255.0 * 65535)

        c = gtk.gdk.Color(r, g, b)
        self._entry.set_color(c)


class Font(_EGWidLabelEntry):
    """Button to select fonts.

    It show current/last selected font and may pop-up a new dialog to
    select a new one.
    """
    font = _gen_ro_property("font")
    callback = _gen_ro_property("callback")

    def __init__(self, id, label="", font="sans 12", callback=None,
                 persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Font selector constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param font: initial content.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.font = font
        self.callback = _callback_tuple(callback)
        _EGWidLabelEntry.__init__(self, id, persistent, label,
                                  expand_policy=expand_policy,
                                  active=active, visible=visible)

        self.__setup_connections__()


    def __setup_gui__(self):
        self._entry = gtk.FontButton(self.font)
        self._entry.set_name(self.id)
        self._entry.set_show_style(True)
        _EGWidLabelEntry.__setup_gui__(self)


    def __setup_connections__(self):
        def callback(obj):
            v = self.get_value()
            self.app.data_changed(self, v)
            for c in self.callback:
                c(self.app, self, v)
        self._entry.connect("font-set", callback)


    def get_value(self):
        return self._entry.get_font_name()


    def set_value(self, value):
        self._entry.set_font_name(value)


class Selection(_EGWidLabelEntry):
    """Selection box (aka Combo box).

    Selection or combo box is an element that allow you to select one of
    various pre-defined values.
    """
    options = _gen_ro_property("options")
    active = _gen_ro_property("active")

    def __init__(self, id, label="", options=None, value=None,
                 callback=None, persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Selection constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param options: list of possible values.
        @param value: selected element.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.options = options or []
        self._value  = value
        self.callback = _callback_tuple(callback)
        _EGWidLabelEntry.__init__(self, id, persistent, label,
                                  expand_policy=expand_policy,
                                  active=active, visible=visible)

        self.__setup_connections__()


    def __setup_gui__(self):
        self._entry = gtk.combo_box_new_text()
        self._entry.set_name(self.id)
        for i, o in enumerate(self.options):
            self._entry.append_text(str(o))
            if self._value == o:
                self._entry.set_active(i)

        _EGWidLabelEntry.__setup_gui__(self)


    def __setup_connections__(self):
        def callback(obj):
            v = self.get_value()
            self.app.data_changed(self, v)
            for c in self.callback:
                c(self.app, self, v)
        self._entry.connect("changed", callback)


    def get_value(self):
        return self._entry.get_active_text()


    def set_value(self, value):
        for i, o in enumerate(self._entry.get_model()):
            if o[0] == value:
                self._entry.set_active(i)


    def append(self, value, set_selected=False):
        """Append new value to available options.

        @param value: string that is not already an option.

        @raise: ValueError: if value is already an option.
        """
        if value not in self.items():
            self._entry.append_text(value)
            if set_selected:
                self.set_value(value)
        else:
            raise ValueError("value already in selection")


    def prepend(self, value, set_selected=False):
        """Prepend new value to available options.

        @param value: string that is not already an option.

        @raise: ValueError: if value is already an option.
        """
        if value not in self.items():
            self._entry.prepend_text(value)
            if set_selected:
                self.set_value(value)
        else:
            raise ValueError("value already in selection")


    def insert(self, position, value, set_selected=False):
        """Insert new option at position.

        @param value: string that is not already an option.

        @raise: ValueError: if value is already an option.
        """
        if value not in self.items():
            self._entry.insert_text(position, value)
            if set_selected:
                self.set_value(value)
        else:
            raise ValueError("value already in selection")


    def remove(self, value):
        """Remove given value from available options.

        @param value: string that is an option.

        @raise ValueError: if value is not already an option.
        """
        for i, o in enumerate(self._entry.get_model()):
            if o[0] == value:
                self._entry.remove_text(i)
                return

        raise ValueError("value not in selection")


    def items(self):
        """Returns every item/option in this selection."""
        return [str(x[0]) for x in  self._entry.get_model()]
    options = items


    def __len__(self):
        return len(self._entry.get_model())


    def __contains__(self, value):
        return value in self.items()


    def __iadd__(self, value):
        """Same as L{append}"""
        self.append(value)


    def __isub__(self, value):
        """Same as L{remove}"""
        self.remove(value)


class Progress(_EGWidLabelEntry):
    """Progress bar."""
    value = _gen_ro_property("value")

    def __init__(self, id, label="", value=0.0, expand_policy=None,
                 active=True, visible=True):
        """Progress bar constructor.

        0 <= value <= 1.0

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial content (0.0 <= value <= 1.0)
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.value = value
        _EGWidLabelEntry.__init__(self, id, False, label,
                                  expand_policy=expand_policy,
                                  active=active, visible=visible)

    def __setup_gui__(self):
        self._entry = gtk.ProgressBar()
        self._entry.set_name(self.id)
        self.set_value(self.value)
        _EGWidLabelEntry.__setup_gui__(self)


    def get_value(self):
        return self._entry.get_fraction()


    def set_value(self, value):
        if 1.0 < value <= 100.0:
            value /= 100.0
        elif not (0.0 <= value <= 1.0):
            raise ValueError(("Progress value of \"%s\" must be "
                              "between 0.0 and 1.0!") % self.id)
        self._entry.set_fraction(value)
        self._entry.set_text("%d%%" % (int(value * 100),))


    def pulse(self):
        """Animate progress bar."""
        self._entry.pulse()


class CheckBox(_EGDataWidget):
    """Check box.

    Check box is an component that have only two values: True (checked) or
    False (unchecked).
    """
    state = _gen_ro_property("state")

    def __init__(self, id, label="", value=False, callback=None,
                 persistent=False, expand_policy=None,
                 active=True, visible=True):
        """Check box constructor.

        @param id: unique identifier.
        @param label: what to show on a label on the left side of the widget.
        @param value: initial state.
        @param callback: function (or list of functions) that will
        be called when this widget have its data changed.
        Function will receive as parameters:
        - App reference
        - Widget reference
        - new value
        @param persistent: if this widget should save its data between
        sessions.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        self.__label = label
        self._value = value
        self.callback = _callback_tuple(callback)

        if expand_policy is None:
            expand_policy = ExpandPolicy.Fill()

        _EGDataWidget.__init__(self, id, persistent,
                               expand_policy=expand_policy,
                               active=active, visible=visible)

        self.__setup_gui__()
        self.__setup_connections__()


    def __setup_gui__(self):
        self._wid = gtk.CheckButton(self.__label)
        self._wid.set_name(self.id)
        self._wid.set_active(self._value)
        self._widgets = (self._wid,)


    def __setup_connections__(self):
        def callback(obj):
            v = self.get_value()
            self.app.data_changed(self, v)
            for c in self.callback:
                c(self.app, self, v)
        self._wid.connect("toggled", callback)


    def get_value(self):
        return self._wid.get_active()


    def set_value(self, value):
        return self._wid.set_active(bool(value))


    def set_label(self, label):
        if self.__label is None:
            raise ValueError("You cannot change label of widget created "
                             "without one. Create it with placeholder! "
                             "(label='')")
        self.__label = label
        self._wid.set_label(self.__label)


    def get_label(self):
        return self.__label

    label = property(get_label, set_label)


class Group(_EGWidget):
    """Group of various components.

    Group is a component that holds other components, always in a vertical
    layout.

    Group has a frame and may show a label.
    """
    children = _gen_ro_property("children")
    horizontal = _gen_ro_property("horizontal")

    BORDER_NONE = gtk.SHADOW_NONE
    BORDER_IN = gtk.SHADOW_IN
    BORDER_OUT = gtk.SHADOW_OUT
    BORDER_ETCHED_IN = gtk.SHADOW_ETCHED_IN
    BORDER_ETCHED_OUT = gtk.SHADOW_ETCHED_OUT

    def _get_app(self):
        return self._contents.app

    def _set_app(self, value):
        self._contents.app = value
    app = property(_get_app, _set_app)


    def __init__(self, id, label="", children=None, horizontal=False,
                 border=BORDER_ETCHED_IN, expand_policy=None,
                 scrollbars=False, active=True, visible=True):
        """Group constructor.

        @param id: unique identified.
        @param label: displayed at top-left.
        @param children: a list of eagle widgets that this group contains.
        @param horizontal: if widgets should be laid out horizontally.
        @param border: can be one of Group.BORDER_* values or None to
        disable border and label completely. Note that some themes
        may have different appearance for borders and some may not
        respect BORDER_NONE, so if you really want no border, use
        None to disable it. Note that Groups without borders cannot
        have one added later.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        if expand_policy is None:
            expand_policy = ExpandPolicy.Horizontal()

        _EGWidget.__init__(self, id, expand_policy=expand_policy,
                           active=active, visible=visible)
        self.__label = label
        self.children = _obj_tuple(children)
        self.horizontal = bool(horizontal)
        self.scrollbars = bool(scrollbars)
        self.__border = border

        self.__setup_gui__()


    def __setup_gui__(self):
        if self.horizontal:
            cls = _HPanel
        else:
            cls = _VPanel

        self._contents = cls(app=None,
                             id=("%s-contents" % self.id),
                             children=self.children)
        if not self.scrollbars:
            self._contents.set_policy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)

        if self.border is not None:
            self._frame = gtk.Frame(self.__label)
            self._frame.set_name(self.id)
            self._frame.set_shadow_type(self.border)
            self._frame.add(self._contents)
            self._contents.show()
            root = self._frame
        else:
            root = self._contents

        self._widgets = (root,)


    def __add_widgets_to_app__(self):
        self._contents.__add_widgets_to_app__
        for w in self.children:
            self.app.__add_widget__(w)


    def set_label(self, label):
        if self.__label is None:
            raise ValueError("You cannot change label of widget created "
                             "without one. Create it with placeholder! "
                             "(label='')")
        self.__label = label
        if self.border is not None:
            self._frame.set_label(self.__label)


    def get_label(self):
        return self.__label

    label = property(get_label, set_label)


    def set_border(self, border):
        if self.__border is None:
            raise ValueError("You cannot change border of widget created "
                             "without one.")

        if border is not None:
            self._frame.set_shadow_type(border)
        else:
            raise ValueError("You cannot remove widget border")

        self.__border = border


    def get_border(self):
        return self.__border

    border = property(get_border, set_border)


class Tabs(_EGWidget):
    """Present widgets in Tabs.

    This is also known as TabControl, TabWidget, Notebook, etc in
    other toolkits.

    Tabs are composed from Pages (L{Tabs.Page}), which behave just
    like L{Group}s and hold a list of widgets.

    Pages can be accessed by their index number (integer) or label,
    using the dictionary syntax or L{Tabs.get_page()} method.
    """

    class Page(_EGWidget, _AutoGenId):
        """Page in Tabs component.

        Pages must have a name and optionally an id, otherwise one id
        will be automatically generated.

        It behaves just like L{Group} component.
        """
        spacing = 3

        children = _gen_ro_property("children")
        horizontal = _gen_ro_property("horizontal")
        parent = _gen_ro_property("parent")

        def __init__(self, id=None, label="", children=None,
                     horizontal=False, active=True, visible=True,
                     callback=None):
            """Tabs.Page constructor.

            @param id: may not be provided, it will be generated automatically.
            @param label: displayed as Page label.
            @param children: a list of eagle widgets that this page contains.
            @param horizontal: if widgets should be laid out horizontally.
            @param callback: function (or list of functions) to call when
            user select this page. Function will get as parameters:
            - App Reference
            - Tabs Reference
            - Tabs.Page reference
            """
            _EGWidget.__init__(self, id or self.__get_id__(),
                               active=active, visible=visible)
            self.__label = label or ""
            self.horizontal = bool(horizontal)
            self.children = _obj_tuple(children)
            self.parent = None
            self._callback = _callback_tuple(callback)
            self._gtk_label = gtk.Label(self.__label)

            self.__setup_gui__()


        def _get_app(self):
            try:
                return self.__ro_app
            except AttributeError:
                return None


        def _set_app(self, value):
            # We need to overload app setter in order to add
            # children widgets to application as soon as we know the app
            try:
                v = self.__ro_app
            except AttributeError:
                v = None
            if v is None:
                self.__ro_app = value
                self.__add_widgets_to_app__()
            else:
                raise Exception("Read Only property 'app'.")

        app = property(_get_app, _set_app)


        def __add_widgets_to_app__(self):
            for w in self.children:
                self.app.__add_widget__(w)


        def __setup_gui__(self):
            self._sw = gtk.ScrolledWindow()
            self._wid = _Table(id=("%s-contents" % self.id),
                               children=self.children,
                               horizontal=self.horizontal)
            self._sw.add_with_viewport(self._wid)
            self._sw.set_shadow_type(gtk.SHADOW_NONE)
            self._sw.child.set_shadow_type(gtk.SHADOW_NONE)
            self._sw.set_policy(hscrollbar_policy=gtk.POLICY_AUTOMATIC,
                                vscrollbar_policy=gtk.POLICY_AUTOMATIC)
            self._wid.show()
            self._sw.show()
            self._widgets = (self._sw,)


        def set_label(self, label):
            if label is None:
                raise ValueError("You cannot have 'None' labels for "
                                 "Tabs.Page!")
            self.__label = str(label)
            self._gtk_label.set_text(self.__label)


        def get_label(self):
            return self.__label

        label = property(get_label, set_label)


        def focus(self):
            self.parent.__focus_page__(self)


        def set_active(self, value=True):
            _EGWidget.set_active(self, value)
            self._gtk_label.set_sensitive(value)

        active = property(_EGWidget.get_active, set_active)


    children = _gen_ro_property("children")


    def __init__(self, id, children=None, expand_policy=None,
                 active=True, visible=True, callback=None):
        """Tabs constructor.

        @param id: unique identified.
        @param children: an iterable with L{Tabs.Page}
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        @param callback: function (or list of functions) to call when
        user change pages. Function will get as parameters:
        - App Reference
        - Tabs Reference
        - Tabs.Page reference
        """
        self._callback = _callback_tuple(callback)
        if expand_policy is None:
            expand_policy = ExpandPolicy.All()

        _EGWidget.__init__(self, id, expand_policy=expand_policy,
                           active=active, visible=visible)
        if not children:
            self.children = tuple()
        else:
            lst = []
            for i, widget in enumerate(children):
                if isinstance(widget, Tabs.Page):
                    lst.append(widget)
                else:
                    sys.stderr.write(("children #%d (%s) is not "
                                      "instance of Tabs.Page, but %s") %
                                     (i, widget, type(widget).__name__))
            self.children = tuple(lst)

        self.__setup_gui__()
        self.__setup_connections__()


    def __setup_gui__(self):
        self._wid = gtk.Notebook()
        for w in self.children:
            w.parent = self
            self._wid.append_page(w._widgets[0], w._gtk_label)
        self._widgets = (self._wid,)


    def __setup_connections__(self):
        if self._callback:
            def callback(notebook, page, page_num):
                p = self.children[page_num]
                for c in self._callback:
                    c(self.app, self, p)
            self._wid.connect("switch-page", callback)

        def callback(notebook, page, page_num, filter_num, filter):
            if page_num == filter_num:
                for c in filter._callback:
                    c(self.app, self, filter)
        for i, c in enumerate(self.children):
            if c._callback:
                self._wid.connect("switch-page", callback, i, c)


    def _get_app(self):
        try:
            return self.__ro_app
        except AttributeError:
            return None


    def _set_app(self, value):
        # We need to overload app setter in order to add
        # children widgets to application as soon as we know the app
        try:
            v = self.__ro_app
        except AttributeError:
            v = None
        if v is None:
            self.__ro_app = value
            self.__add_widgets_to_app__()
        else:
            raise Exception("Read Only property 'app'.")

    app = property(_get_app, _set_app)


    def __add_widgets_to_app__(self):
        for w in self.children:
            self.app.__add_widget__(w)


    def __focus_page__(self, page):
        for index, p in enumerate(self.children):
            if p == page:
                self._wid.set_current_page(index)
                return
        raise ValueError("Page '%s' doesn't exist in this Tab." % (page,))


    def focus_page(self, index_or_id_or_page):
        """Make given page visible."""
        if not isinstance(index_or_id_or_page, Tabs.Page):
            index_or_id = index_or_id_or_page
            page = self.get_page(index_or_id)
        else:
            page = index_or_id_or_page
        page.focus()


    def get_page(self, index_or_id):
        """Get the Tabs.Page given its index or id.

        @raise KeyError if index_or_id doesn't exists.
        """
        if isinstance(index_or_id, basestring):
            id = index_or_id
            for w in self.children:
                if w.id == id:
                    return w
            raise KeyError("No page with id='%s'" % id)
        else:
            index = index_or_id
            try:
                return self.children[index]
            except IndexError, e:
                raise KeyError("No page numbered %s" % index)


    def __getitem__(self, index_or_id):
        """Same as L{Tabs.get_page()}.

        @raise KeyError see L{Tabs.get_page()}
        @see L{Tabs.get_page()}
        """
        return self.get_page(index_or_id)


    def __setitem__(self, index_or_id, value):
        """Set L{Tabs.Page.label} of a page get using 'index_or_id' for
        L{Tabs.get_page()}.

        @raise KeyError see L{Tabs.get_page()}
        @see L{Tabs.get_page()}
        """
        page = self[index_or_id]
        page.label = value


class _DateEditor(gtk.HBox):
    def __init__(self, value=None):
        gtk.HBox.__init__(self, homogeneous=False, spacing=2)
        def Entry(max):
            e = gtk.SpinButton(digits=0)
            e.show()
            e.set_range(1, max)
            e.set_increments(1, 10)
            self.pack_start(e, fill=True, expand=False)
            return e

        self.year = Entry(9999)
        self.month = Entry(12)
        self.day = Entry(31)

        self.value = value or datetime.date.today()


    def set_value(self, value):
        self.year.set_value(value.year)
        self.month.set_value(value.month)
        self.day.set_value(value.day)


    def get_value(self):
        return datetime.date(int(self.year.get_value()),
                             int(self.month.get_value()),
                             int(self.day.get_value()))

    value = property(get_value, set_value)


class _TimeEditor(gtk.HBox):
    def __init__(self, value=None):
        gtk.HBox.__init__(self, homogeneous=False, spacing=2)
        def Entry(max):
            e = gtk.SpinButton(digits=0)
            e.show()
            e.set_range(0, max)
            e.set_increments(1, 10)
            self.pack_start(e, fill=True, expand=False)
            return e

        self.hour = Entry(23)
        self.minute = Entry(59)
        self.second = Entry(59)

        self.value = value or datetime.datetime.now().time()


    def set_value(self, value):
        self.hour.set_value(value.hour)
        self.minute.set_value(value.minute)
        self.second.set_value(value.second)


    def get_value(self):
        return datetime.time(int(self.hour.get_value()),
                             int(self.minute.get_value()),
                             int(self.second.get_value()))

    value = property(get_value, set_value)


class _DateTimeEditor(gtk.HBox):
    def __init__(self, value=None):
        gtk.HBox.__init__(self, homogeneous=False, spacing=4)

        self.date = _DateEditor()
        self.pack_start(self.date, fill=True, expand=False)
        self.date.show()

        self.time = _TimeEditor()
        self.pack_start(self.time, fill=True, expand=False)
        self.time.show()

        self.value = value or datetime.datetime.now()


    def set_value(self, value):
        self.time.set_value(value.time())
        self.date.set_value(value.date())


    def get_value(self):
        t = self.time.get_value()
        d = self.date.get_value()
        return datetime.datetime.combine(d, t)

    value = property(get_value, set_value)


class _CellRendererButton(gtk.CellRendererText):
    __gproperties__ = {"callable": (gobject.TYPE_PYOBJECT,
                                    "callable property",
                                    "callable property",
                                    gobject.PARAM_READWRITE)}
    _button_width = 40
    _button_height = 20

    def __init__(self):
        self.__gobject_init__()
        gtk.CellRendererText.__init__(self)
        self.set_property("xalign", 0.5)
        self.set_property("mode", gtk.CELL_RENDERER_MODE_ACTIVATABLE)
        self.callable = None
        self.table = None


    def do_set_property(self, pspec, value):
        if pspec.name == "callable":
            if callable(value):
                self.callable = value
            else:
                raise TypeError("callable property must be callable!")
        else:
            raise AttributeError("Unknown property %s" % pspec.name)


    def do_get_property(self, pspec):
        if pspec.name == "callable":
            return self.callable
        else:
            raise AttributeError("Unknown property %s" % pspec.name)


    def do_get_size(self, wid, cell_area):
        xpad = self.get_property("xpad")
        ypad = self.get_property("ypad")

        if not cell_area:
            x, y = 0, 0
            w = 2 * xpad + self._button_width
            h = 2 * ypad + self._button_height
        else:
            w = 2 * xpad + cell_area.width
            h = 2 * ypad + cell_area.height

            xalign = self.get_property("xalign")
            yalign = self.get_property("yalign")

            x = max(0, xalign * (cell_area.width - w))
            y = max(0, yalign * (cell_area.height - h))

        return (x, y, w, h)


    def do_render(self, window, wid, bg_area, cell_area, expose_area, flags):
        if not window:
            return

        xpad = self.get_property("xpad")
        ypad = self.get_property("ypad")

        x, y, w, h = self.get_size(wid, cell_area)

        state = gtk.STATE_NORMAL
        shadow = gtk.SHADOW_OUT
        wid.get_style().paint_box(window, state, shadow, cell_area,
                                  wid, "button",
                                  cell_area.x + x + xpad,
                                  cell_area.y + y + ypad,
                                  w - 1, h - 1)
        flags = flags & ~gtk.STATE_SELECTED
        gtk.CellRendererText.do_render(self, window, wid, bg_area,
                                       cell_area, expose_area, flags)

    def do_activate(self, event, wid, path, bg_area, cell_area, flags):
        cb = self.get_property("callable")
        cb(self.table.app, self.table, int(path))
        return True
gobject.type_register(_CellRendererButton)


class Table(_EGWidget):
    """Data table.

    Each column should have only one type, it will be checked.
    Can be accessed as a python list:

    >>> t = Table('t', 'table', [1, 2, 3])
    >>> t[0]
    [1]
    >>> del t[1]
    >>> t[:]
    [1, 3]
    """
    spacing = 3


    class ProgressCell(int):
        """Type used to have a Progress cell on table.

        You can use this type in Table(types=(...), ...) to render it
        as a progress indicator.

        Values range from 0..100
        """


    class ButtonCell(object):
        """Type used to have a Progress cell on table.

        You can use this type in Table(types=(...), ...) to render it
        as a progress indicator.

        Values range from 0..100
        """
        def __new__(t, *a, **ka):
            print t, a, ka
            return t(*a, **ka)


    class Row(object):
        # Used to hide gtk.ListStore
        def __init__(self, items):
            self.__items = items


        def __str__(self):
            return "[" + ", ".join([str(x) for x in self.__items]) + "]"
        __repr__ = __str__


        def __len__(self):
            return len(self.__items)


        def __nonzero__(self):
            if self.__items:
                return True
            else:
                return False


        def __getitem__(self, index):
            return self.__items[index]


        def __setitem__(self, index, value):
            self.__items[index] = value


        def __delitem__(self, index):
            del self.__items[index]


        def __contains__(self, element):
            return element in self.__items


        def __getslice__(self, start, end):
            slice = []

            l = len(self.__items)
            while start < 0:
                start += l
            while end < 0:
                end += l

            start = min(start, l)
            end = min(end, l) # l[:] -> l[0 : maxlistindex]

            for i in xrange(start, end):
                slice.append(self.__items[i])
            return slice


        def __setslice__(self, start, end, items):
            l = len(self.__items)
            while start < 0:
                start += l
            while end < 0:
                end += l

            start = min(start, l)
            end = min(end, l) # l[:] -> l[0 : maxlistindex]

            l2 = len(items)
            if end - start > l2:
                end = start + l2

            if self.__items.model._hid_row_changed is not None:
                hid_changed = self.__items.model._hid_row_changed
                self.__items.model.handler_block(hid_changed)

            j = 0
            for i in xrange(start, end):
                self.__items[i] = items[j]
                j += 1

            if self.__items.model._hid_row_changed is not None:
                hid_changed = self.__items.model._hid_row_changed
                self.__items.model.handler_unblock(hid_changed)
                i = self.__items.iter
                p = self.__items.path
                self.__items.model.row_changed(p, i)



    class CellFormat(object):
        XALIGN_LEFT = 1
        XALIGN_RIGHT = 2
        XALIGN_CENTER = 3

        YALIGN_TOP = 1
        YALIGN_BOTTOM = 2
        YALIGN_CENTER = 3

        __slots__ = ("fgcolor", "bgcolor", "font", "bold",
                     "italic", "underline", "strike", "contents",
                     "xalign", "yalign")
        def __init__(self, **kargs):
            for a in self.__slots__:
                v = kargs.get(a, None)
                setattr(self, a, v)


    default_value_function_for_type = {
        bool: bool,
        int: int,
        long: long,
        float: float,
        str: str,
        unicode: unicode,
        datetime.date: lambda *a: datetime.date.today(),
        datetime.time: lambda *a: datetime.datetime.now().time(),
        datetime.datetime: lambda *a: datetime.datetime.now(),
        }


    def __init__(self, id, label="", items=None, types=None, selected=None,
                 headers=None, show_headers=True, editable=False,
                 repositioning=False, expand_columns_indexes=None,
                 hidden_columns_indexes=None, cell_format_func=None,
                 user_widgets=None,
                 selection_callback=None, data_changed_callback=None,
                 scrollbars=True, expand_policy=None, active=True,
                 visible=True):
        """Table constructor.

        Table can work with not known objects, they just need to
        implement some methods:
        - type.default_value(): return a new, possible non
        initialized instance. Used in default L{add_callback()}
        - object.commit(): changes were made and they should be
        commited.
        - object.rollback(): changes were made and they should be
        reverted.
        - object.delete(): delete object
        - object.get_edit_widget(): get eagle widget to use to edit
        this object.

        @param id: unique identifier.
        @param label: what to show on table frame
        @param items: a list (single column) or list of lists (multiple
        columns)
        @param types: a list of types (str, int, long, float, unicode, bool)
        for columns, if omitted, will be guessed from items.
        @param selected: index of selected row or None, for no pre-selected.
        @param headers: what to use as table header.
        @param show_headers: whenever to show table headers
        @param editable: if table is editable. If editable, user can change
        values inline or double-clicking, also edit buttons will
        show after the table.
        @param repositioning: allow items to be moved up and down.
        @param expand_columns_indexes: list of indexes that can expand size
        @param cell_format_func: if define, should return a CellFormat with
        properties to be applied to cell. Only non-None properties will
        be used. Function should have the following signature:
        def func(app, table, row, col, value):
        return Table.CellFormat(...)
        where row and col are indexes in table.
        @param user_widgets: widgets to be appended to table's
        actions, just after edit or move buttons.
        @param selection_callback: the function (or list of functions) to
        call when selection changes. Function will get as parameters:
        - App reference
        - Table reference
        - List of pairs (index, row_contents)
        @param data_changed_callback: the function (or list of functions) to
        call when data changes. Function will get as parameters:
        - App reference
        - Table reference
        - Pair (index, row_contents)
        @param scrollbars: whenever to use scrollbars and make table
        fit small places.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.

        @warning: although this widget contains data, it's not a
        _EGDataWidget and thus will not notify application that
        data changed, also it cannot persist it's data
        automatically, if you wish, do it manually. This behavior
        may change in future if Table show to be useful as
        _EGDataWidget.
        """
        self._app = None
        if expand_policy is None:
            expand_policy = ExpandPolicy.All()

        _EGWidget.__init__(self, id, expand_policy=expand_policy,
                           active=active, visible=visible)
        self.editable = editable or False
        self.repositioning = repositioning or False
        self.__label = label
        self.headers = headers or tuple()
        self.show_headers = bool(show_headers)
        self.cell_format_func = cell_format_func
        self.user_widgets = _obj_tuple(user_widgets)
        self.scrollbars = bool(scrollbars)

        if isinstance(expand_columns_indexes, (int, long)):
            expand_columns_indexes = (expand_columns_indexes,)
        elif isinstance(expand_columns_indexes, (tuple, list)):
            expand_columns_indexes = tuple(expand_columns_indexes)
        elif expand_columns_indexes is None:
            expand_columns_indexes = tuple()
        else:
            raise ValueError(\
                "expand_columns_indexes must be a sequence of integers")
        self.expand_columns_indexes = expand_columns_indexes

        if isinstance(hidden_columns_indexes, (int, long)):
            hidden_columns_indexes = (hidden_columns_indexes,)
        elif isinstance(hidden_columns_indexes, (tuple, list)):
            hidden_columns_indexes = tuple(hidden_columns_indexes)
        elif hidden_columns_indexes is None:
            hidden_columns_indexes = tuple()
        else:
            raise ValueError(\
                "hidden_columns_indexes must be a sequence of integers")
        self.hidden_columns_indexes = hidden_columns_indexes

        if not (types or items):
            raise ValueError("Must provide items or types!")
        elif not types:
            items = items or []
            if not isinstance(items[0], (list, tuple)):
                # just one column, convert to generic representation
                items = [[i] for i in items]

            types = [type(i) for i in items[0]]
        self.types = types
        self.items = items

        self.selection_callback = _callback_tuple(selection_callback)
        self.data_changed_callback = _callback_tuple(data_changed_callback)

        self.__setup_gui__()

        self._model._hid_row_changed = None
        self._model._hid_row_deleted = None
        self._model._hid_row_inserted = None
        self.__setup_connections__()
        self.__setup_items__()
        if selected is not None:
            self.select(selected)


    def _get_app(self):
        return self._app


    def _set_app(self, value):
        self._app = value
        if self._action_group:
            self._action_group.app = value
    app = property(_get_app, _set_app)


    def __setup_gui__(self):
        self._vbox = gtk.VBox(False, self.spacing)
        self._vbox.set_border_width(self.spacing)
        self._vbox.set_name("vbox-%s" % self.id)

        if self.label is not None:
            self._frame = gtk.Frame(self.label)
            self._frame.set_name(self.id)
            self._frame.add(self._vbox)
            self._vbox.show()
            root = self._frame
        else:
            root = self._vbox
        self._widgets = (root,)

        self.__setup_table__()

        action_widgets = []

        if self.editable:
            def add(app, button):
                self.add_callback()

            def edit(app, button):
                selected = self.selected()
                if not selected:
                    return
                self.edit_callback(selected)

            def remove(app, button):
                selected = self.selected()
                if not selected:
                    return
                self.del_callback(selected)

            self._btn_add = Button(id="%s:action:add" % self.id,
                                   stock="add",
                                   callback=add,
                                   )
            self._btn_edit = Button(id="%s:action:edit" % self.id,
                                    stock="edit",
                                    callback=edit,
                                    )
            self._btn_del = Button(id="%s:action:del" % self.id,
                                   stock="remove",
                                   callback=remove,
                                   )

            action_widgets += [self._btn_add, self._btn_edit,
                               self._btn_del]

        if self.repositioning:
            if self.editable:
                action_widgets.append(VSeparator())


            def up(app, button):
                result = self.selected()
                a = result[0][0]
                if a <= 0:
                    return
                self.move_up_callback(a)

            def down(app, button):
                result = self.selected()
                a = result[0][0]
                if a >= len(self) - 1:
                    return
                self.move_down_callback(a)

            self._btn_up = Button(id="%s:action:up" % self.id,
                                  stock="up",
                                  callback=up,
                                  )
            self._btn_down = Button(id="%s:action:down" % self.id,
                                    stock="down",
                                    callback=down,
                                    )
            self._btn_up.active = False
            self._btn_down.active = False
            action_widgets += [self._btn_up, self._btn_down]

        if self.user_widgets:
            if self.editable or self.repositioning:
                action_widgets.append(VSeparator())

            action_widgets.extend(self.user_widgets)

        if action_widgets:
            self._action_group = Group(id="%s:actions" % self.id,
                                       horizontal=True,
                                       scrollbars=False,
                                       label=None,
                                       border=None,
                                       children=action_widgets,
                                       )
            self._action_group.show()
            action_gtk_widget = self._action_group.__get_widgets__()[0]
            self._vbox.pack_start(action_gtk_widget, False, True)
        else:
            self._action_group = None


    def __setup_connections__(self):
        if self.data_changed_callback:
            self.__setup_connections_changed__()

        if self.selection_callback or self.repositioning:
            self.__setup_connections_selection__()


    def __setup_connections_changed__(self):
        def row_changed(model, path, itr):
            self._model.handler_block(self._model._hid_row_changed)
            try:
                index = path[0]
                v = (index, Table.Row(model[path]))
                for c in self.data_changed_callback:
                    c(self.app, self, v)
            finally:
                self._model.handler_unblock(self._model._hid_row_changed)


        def row_deleted(model, path):
            index = path[0]
            v = (index, None)
            for c in self.data_changed_callback:
                c(self.app, self, v)

        c = self._model.connect
        self._model._hid_row_changed = c("row-changed", row_changed)
        self._model._hid_row_deleted = c("row-deleted", row_deleted)
        self._model._hid_row_inserted = c("row-inserted", row_changed)


    def __get_default_value_function_for_type__(self, type):
        return self.default_value_function_for_type.get(type)


    def edit_dialog(self, data):
        """Dialog used to edit data from table.

        @param data: some row from table.
        @return None if user cancelled action or new row to replace
        the old one.
        """
        title = "Edit data from table %s" % (self.label or self.id)
        buttons = (gtk.STOCK_OK, gtk.RESPONSE_ACCEPT,
                   gtk.STOCK_CANCEL, gtk.RESPONSE_REJECT)
        d = gtk.Dialog(title=title,
                       flags=gtk.DIALOG_MODAL,
                       buttons=buttons)
        d.set_default_response(gtk.RESPONSE_ACCEPT)

        l = len(data)
        t = gtk.Table(l, 2)
        t.set_border_width(0)
        w = {}
        for i, v in enumerate(data):
            if i in self.hidden_columns_indexes:
                continue

            title = self._table.get_column(i).get_title()
            label = gtk.Label("%s:" % title)
            label.set_justify(gtk.JUSTIFY_RIGHT)
            label.set_alignment(xalign=1.0, yalign=0.5)

            tp = self.types[i]
            if   tp == bool:
                entry = gtk.CheckButton()
                entry.set_active(data[i])
            elif tp in (int, long):
                entry = gtk.SpinButton(digits=0)
                adj = entry.get_adjustment()
                adj.lower = Spin.default_min
                adj.upper = Spin.default_max
                adj.step_increment = 1
                adj.page_increment = 5
                entry.set_value(data[i])
            elif tp == float:
                entry = gtk.SpinButton(digits=6)
                adj = entry.get_adjustment()
                adj.lower = Spin.default_min
                adj.upper = Spin.default_max
                adj.step_increment = 1
                adj.page_increment = 5
                entry.set_value(data[i])
            elif tp in (str, unicode):
                entry = gtk.Entry()
                entry.set_text(data[i])
            elif tp == Image:
                entry = gtk.Image()
                entry.set_from_pixbuf(data[i].__get_gtk_pixbuf__())
            elif tp == datetime.datetime:
                entry = _DateTimeEditor(data[i])
            elif tp == datetime.date:
                entry = _DateEditor(data[i])
            elif tp == datetime.time:
                entry = _TimeEditor(data[i])
            else:
                entry = gtk.Label(str(data[i]))

            t.attach(label, 0, 1, i, i + 1,
                     xoptions=gtk.FILL,
                     xpadding=self.spacing, ypadding=self.spacing)
            t.attach(entry, 1, 2, i, i + 1,
                     xoptions=gtk.EXPAND|gtk.FILL,
                     xpadding=self.spacing, ypadding=self.spacing)
            w[i] = entry

        t.show_all()

        sw = gtk.ScrolledWindow()
        sw.add_with_viewport(t)
        sw.get_child().set_shadow_type(gtk.SHADOW_NONE)
        d.vbox.pack_start(sw)
        # Hack, disable scrollbars so we get the window to the
        # best size
        sw.set_policy(hscrollbar_policy=gtk.POLICY_NEVER,
                      vscrollbar_policy=gtk.POLICY_NEVER)
        d.show_all()
        # Scrollbars are automatic
        sw.set_policy(hscrollbar_policy=gtk.POLICY_AUTOMATIC,
                      vscrollbar_policy=gtk.POLICY_AUTOMATIC)

        r = d.run()
        d.destroy()
        if r in (gtk.RESPONSE_REJECT, gtk.RESPONSE_DELETE_EVENT) :
            return None
        else:
            result = []
            for i in xrange(len(data)):
                tp = self.types[i]

                if i not in w:
                    r = data[i]
                else:
                    wid = w[i]

                    if   tp == bool:
                        r = bool(wid.get_active())
                    elif tp in (int, long):
                        r = tp(wid.get_value())
                    elif tp == float:
                        r = float(wid.get_value())
                    elif tp in (str, unicode):
                        r = tp(wid.get_text())
                    elif tp == datetime.datetime:
                        r = wid.get_value()
                    elif tp == datetime.date:
                        r = wid.get_value()
                    elif tp == datetime.time():
                        r = wid.get_value()
                    else:
                        r = data[i]
                result.append(r)

            return result


    add_dialog = edit_dialog


    def add_callback(self):
        """Callback for 'Add' button.

        This method is called when 'Add' button, visible when
        editable=True, is clicked.

        Default implementation creates a new row using some defaults
        for known objects, like bool, numbers and strings or calls
        default_value() on type to get some default value. If none of
        these are available, then None will be used.

        If user accept values, row will be append()ed to table,
        otherwise it will be forgotten and garbage collector will
        remove then.

        If type is not known by system (so default_value() was
        called), object.commit() will be called, otherwise
        object.rollback() will be called. You can use this to perform
        some action on database.

        It can be overloaded by applications so more ellaborated actions
        can be done.
        """
        entry = []
        for i, t in enumerate(self.types):
            f = self.__get_default_value_function_for_type__(t)
            if f:
                v = f()
            else:
                try:
                    v = t.default_value()
                except AttributeError:
                    try:
                        name = t.__name__
                    except:
                        name = t
                    v = None
                    sys.stderr.write(("Unsuported column (%d) type: %s."
                                      " Type should provide "
                                      "default_value() static method.\n")
                                     % (i, name))
            entry.append(v)

        result = self.add_dialog(entry)
        if result:
            for o in result:
                if hasattr(o, "commit"):
                    o.commit()
            self.append(result)
        else:
            for o in entry:
                if hasattr(o, "rollback"):
                    o.rollback()


    def edit_callback(self, rows):
        """Callback for 'Edit' button.

        This method is called when 'Edit' button, visible when
        editable=True, is clicked.

        If row objects has commit() or rollback() methods, they'll be
        called based on user action (L{entry_dialog()} returned row or
        None)

        @param rows: a list of tuples with (index, row), just like
        L{selected()}
        """
        for index, data in rows:
            result = self.edit_dialog(data)
            if result:
                for o in result:
                    if hasattr(o, "commit"):
                        o.commit()
                self[index] = result
            else:
                for o in data:
                    if hasattr(o, "rollback"):
                        o.rollback()


    def del_callback(self, rows):
        """Callback for 'Delete' button.

        This method is called when 'Delete' button, visible when
        editable=True, is clicked.

        If row object has delete(), it will be called before row is
        excluded.
        """
        for index, data in rows:
            for o in self[index]:
                if hasattr(o, "delete"):
                    o.delete()
            del self[index]


    def move_up_callback(self, index):
        previous = index - 1
        current_row = list(self[index])
        previous_row = list(self[previous])
        self[index] = previous_row
        self[previous] = current_row
        self.select(previous)


    def move_down_callback(self, index):
        next = index + 1
        current_row = list(self[index])
        next_row = list(self[next])
        self[index] = next_row
        self[next] = current_row
        self.select(next)


    def __setup_connections_selection__(self):
        def selection_changed(selection):
            result = self.selected()

            if self.repositioning:
                if not result:
                    self._btn_up.active = False
                    self._btn_down.active = False
                else:
                    path = result[0][0]
                    self._btn_up.active = (path > 0)
                    self._btn_down.active = (path < len(self) - 1)

            for c in self.selection_callback:
                c(self.app, self, result)

        selection = self._table.get_selection()
        selection.connect("changed", selection_changed)


    def __create_column_cell_format_func__(self, col, cell_rend):
        def get_color(c):
            return Canvas.__to_gtk_color__(Canvas.__color_from__(c))

        def func(column, cell_renderer, model, itr, col_idx):
            row_idx = model.get_path(itr)[0]
            value = model.get_value(itr, col_idx)
            cf = self.cell_format_func(self.app, self,
                                       row_idx, col_idx, value)
            if cf is None:
                cf = Table.CellFormat()

            bgcolor = cf.bgcolor
            if bgcolor is not None:
                bgcolor = get_color(bgcolor)
            else:
                bgcolor = self._table.style.base[gtk.STATE_NORMAL]
            cell_renderer.set_property("cell-background-gdk",
                                       bgcolor)

            if isinstance(cell_renderer, gtk.CellRendererText):
                v = None
                if cf.contents is not None:
                    v = model[itr][col_idx]

                    if callable(cf.contents):
                        v = cf.contents(v)
                    else:
                        v = cf.contents

                if callable(cell_renderer.model_view_conv):
                    if v is None:
                        v = model[itr][col_idx]
                    v = cell_renderer.model_view_conv(v)

                if v is not None:
                    cell_renderer.set_property("text", v)

                font = cf.font
                if font is not None:
                    font = pango.FontDescription(font)
                else:
                    font = self._table.style.font_desc
                cell_renderer.set_property("font-desc", font)

                fgcolor = cf.fgcolor
                if fgcolor is not None:
                    fgcolor = get_color(fgcolor)
                else:
                    fgcolor = self._table.style.text[gtk.STATE_NORMAL]
                cell_renderer.set_property("foreground-gdk", fgcolor)

                if cf.underline:
                    underline = pango.UNDERLINE_SINGLE
                else:
                    underline = pango.UNDERLINE_NONE
                cell_renderer.set_property("underline", underline)

                if cf.bold:
                    bold = pango.WEIGHT_BOLD
                else:
                    bold = pango.WEIGHT_NORMAL
                cell_renderer.set_property("weight", bold)

                if cf.italic:
                    italic = pango.STYLE_ITALIC
                else:
                    italic = pango.STYLE_NORMAL
                cell_renderer.set_property("style", italic)

                xalign = 0.0
                if cf.xalign:
                    if cf.xalign == cf.XALIGN_LEFT:
                        xalign = 0.0
                    elif cf.xalign == cf.XALIGN_RIGHT:
                        xalign = 1.0
                    else:
                        xalign = 0.5
                cell_renderer.set_property("xalign", xalign)

                yalign = 0.0
                if cf.yalign:
                    if cf.yalign == cf.YALIGN_TOP:
                        yalign = 0.0
                    elif cf.yalign == cf.YALIGN_BOTTOM:
                        yalign = 1.0
                    else:
                        yalign = 0.5
                cell_renderer.set_property("yalign", yalign)

                cell_renderer.set_property("strikethrough",
                                           bool(cf.strike))

            elif isinstance(cell_renderer, gtk.CellRendererToggle):
                v = None
                if cf.contents is not None:
                    v = model[itr][col_idx]

                    if callable(cf.contents):
                        v = cf.contents(v)
                    else:
                        v = cf.contents

                if callable(cell_renderer.model_view_conv):
                    if v is None:
                        v = model[itr][col_idx]
                    v = cell_renderer.model_view_conv(v)

                if v is not None:
                    cell_renderer.set_property("active", v)

            elif isinstance(cell_renderer, gtk.CellRendererPixbuf):
                v = None
                if cf.contents is not None:
                    v = model[itr][col_idx]

                    if callable(cf.contents):
                        v = cf.contents(v)
                    else:
                        v = cf.contents

                if callable(cell_renderer.model_view_conv):
                    if v is None:
                        v = model[itr][col_idx]
                    v = cell_renderer.model_view_conv(v)

                if v is not None:
                    cell_renderer.set_property("pixbuf", v)
        return func


    def __setup_table__(self):
        self.__setup_model__()
        self._table = gtk.TreeView(self._model)
        self._table.show()
        self._table.set_name("table-%s" % self.id)
        self._table.get_selection().set_mode(gtk.SELECTION_MULTIPLE)

        def column_clicked(column):
            cid, order = self._model.get_sort_column_id()
            self._model.set_sort_column_id(cid, order)

        def toggled(cell_render, path, col):
            self._model[path][col] = not self._model[path][col]


        def edited(cell_render, path, text, col):
            t = self.types[col]
            try:
                value = t(text)
            except ValueError, e:
                name = t.__name__
                error("Invalid contents for column of type '%s': %s" %
                      (name, text))
            else:
                self._model[path][col] = value


        def date2str(date):
            if date:
                return date.strftime("%x")
            else:
                return ""


        def time2str(time):
            if time:
                return time.strftime("%X")
            else:
                return ""


        def datetime2str(dt):
            if dt:
                return dt.strftime("%c")
            else:
                return ""

        def parse_datetime(text, formats, errmsg):
            for f in formats:
                try:
                    t = time.strptime(text, f)[0 : 6]
                    return datetime.datetime(*t)
                except ValueError, e:
                    pass

            p = ", ".join(repr(f) for f in formats)
            info(errmsg + " %r should match one of: %s" % (text, p))


        def date_edited(cell_render, path, text, col):
            dt = parse_datetime(text, ("%x", "%Y-%m-%d", "%y-%m-%d"),
                                "Invalid date.")
            if dt:
                self._model[path][col] = dt.date()


        def time_edited(cell_render, path, text, col):
            dt = parse_datetime(text, ("%X", "%H:%M:%S", "%H:%M"),
                                "Invalid time.")
            if dt:
                self._model[path][col] = dt.time()


        def datetime_edited(cell_render, path, text, col):
            dt = parse_datetime(text, ("%c", "%x %X", "%X %x",
                                       "%Y-%m-%d %H:%M:%S",
                                       "%y-%m-%d %H:%M:%S",
                                       "%Y-%m-%d %H:%M",
                                       "%y-%m-%d %H:%M"),
                                "Invalid datetime.")
            if dt:
                self._model[path][col] = dt


        for i, t in enumerate(self.types):
            if   t == bool:
                cell_rend = gtk.CellRendererToggle()
                props = {"active": i}
                cell_rend.model_view_conv = None
                if self.editable:
                    cell_rend.set_property("activatable", True)
                    cell_rend.connect("toggled", toggled, i)
            elif t == Table.ProgressCell:
                cell_rend = gtk.CellRendererProgress()
                props = {"value": i}
                cell_rend.model_view_conv = None
            elif t in (int, long, float, str, unicode):
                cell_rend = gtk.CellRendererText()
                props = {"text": i}
                cell_rend.model_view_conv = None
                if self.editable:
                    cell_rend.set_property("editable", True)
                    cell_rend.connect("edited", edited, i)

                if t in (int, long, float):
                    cell_rend.set_property("xalign", 1.0)
            elif t == Image:
                cell_rend = gtk.CellRendererPixbuf()
                cell_rend.model_view_conv = lambda x: x.__get_gtk_pixbuf__()
                props = {}
            elif t == datetime.datetime:
                cell_rend = gtk.CellRendererText()
                props = {"text": i}
                cell_rend.model_view_conv = datetime2str
                if self.editable:
                    cell_rend.set_property("editable", True)
                    cell_rend.connect("edited", datetime_edited, i)
            elif t == datetime.date:
                cell_rend = gtk.CellRendererText()
                props = {"text": i}
                cell_rend.model_view_conv = date2str
                if self.editable:
                    cell_rend.set_property("editable", True)
                    cell_rend.connect("edited", date_edited, i)
            elif t == datetime.time:
                cell_rend = gtk.CellRendererText()
                props = {"text": i}
                cell_rend.model_view_conv = time2str
                if self.editable:
                    cell_rend.set_property("editable", True)
                    cell_rend.connect("edited", time_edited, i)
            elif t == Table.ButtonCell:
                cell_rend = _CellRendererButton()
                cell_rend.table = self
                cell_rend.set_property("text", self.headers[i])
                props = {"callable": i}
                cell_rend.model_view_conv = None
            else:
                cell_rend = gtk.CellRendererText()
                props = {}
                cell_rend.model_view_conv = str

            try:
                title = self.headers[i]
            except IndexError:
                title = "Col-%d (%s)" % (i, t.__name__)

            col = gtk.TreeViewColumn(title, cell_rend, **props)
            col.set_resizable(True)
            col.set_sort_column_id(i)
            col.connect("clicked", column_clicked)

            if self.cell_format_func:
                f = self.__create_column_cell_format_func__(col, cell_rend)
                col.set_cell_data_func(cell_rend, f, i)

            elif callable(cell_rend.model_view_conv):
                def f(column, cell_rend, model, iter, model_idx):
                    o = model[iter][model_idx]
                    v = cell_rend.model_view_conv(o)
                    if   isinstance(cell_rend, gtk.CellRendererText):
                        cell_rend.set_property("text", v)
                    elif isinstance(cell_rend, gtk.CellRendererToggle):
                        cell_rend.set_property("active", v)
                    elif isinstance(cell_rend, gtk.CellRendererPixbuf):
                        cell_rend.set_property("pixbuf", v)
                    elif isinstance(cell_rend, gtk.CellRendererProgress):
                        cell_rend.set_property("value", v)
                    elif isinstance(cell_rend, _CellRendererButton):
                        cell_rend.set_property("callable", v)
                col.set_cell_data_func(cell_rend, f, i)


            if i in self.expand_columns_indexes:
                col.set_expand(True)
            else:
                col.set_expand(False)

            if i not in self.hidden_columns_indexes:
                col.set_visible(True)
            else:
                col.set_visible(False)

            self._table.append_column(col)


        self._table.set_headers_visible(self.show_headers)
        self._table.set_headers_clickable(True)
        self._table.set_reorderable(self.repositioning)
        self._table.set_enable_search(True)

        self._sw = gtk.ScrolledWindow()
        self._sw.show()
        if self.scrollbars:
            policy = gtk.POLICY_AUTOMATIC
        else:
            policy = gtk.POLICY_NEVER
        self._sw.set_policy(hscrollbar_policy=policy,
                            vscrollbar_policy=policy)
        self._sw.set_shadow_type(gtk.SHADOW_IN)
        self._sw.add(self._table)
        self._vbox.pack_start(self._sw)


    def __setup_items__(self):
        if self.items:
            for row in self.items:
                self.append(row, select=False, autosize=False)
            self.columns_autosize()



    def __setup_model__(self):
        gtk_types = []
        for i, t in enumerate(self.types):
            if   t == bool:
                gtk_types.append(gobject.TYPE_BOOLEAN)
            elif t in (int, Table.ProgressCell):
                gtk_types.append(gobject.TYPE_INT)
            elif t == long:
                gtk_types.append(gobject.TYPE_LONG)
            elif t == float:
                gtk_types.append(gobject.TYPE_FLOAT)
            elif t in (str, unicode):
                gtk_types.append(gobject.TYPE_STRING)
            else:
                gtk_types.append(gobject.TYPE_PYOBJECT)

        self._model = gtk.ListStore(*gtk_types)

        def sort_fn(model, itr1, itr2, id):
            try:
                return cmp(model[itr1][id], model[itr2][id])
            except TypeError, e:
                return 0

        for i in xrange(len(self.types)):
            self._model.set_sort_func(i, sort_fn, i)


    def focus(self):
        self._table.grab_focus()


    def set_label(self, label):
        if self.__label is None:
            raise ValueError("You cannot change label of widget created "
                             "without one. Create it with placeholder! "
                             "(label='')")
        self.__label = label
        self._frame.set_label(self.__label)


    def get_label(self):
        return self.__label

    label = property(get_label, set_label)


    def columns_autosize(self):
        self._table.columns_autosize()


    def select(self, index):
        selection = self._table.get_selection()
        selection.unselect_all()
        if index is not None:
            selection.select_path(index)


    def selected(self):
        model, paths = self._table.get_selection().get_selected_rows()
        if paths:
            result = []
            for p in paths:
                result.append((p[0], Table.Row(model[p])))
            return result
        else:
            return None


    def append(self, row, select=True, autosize=True):
        if not isinstance(row, (list, tuple)):
            row = (row,)

        if self._model._hid_row_inserted is not None:
            self._model.handler_block(self._model._hid_row_inserted)
        if self._model._hid_row_changed is not None:
            self._model.handler_block(self._model._hid_row_changed)
        itr = self._model.append(row)
        if self._model._hid_row_changed is not None:
            self._model.handler_unblock(self._model._hid_row_changed)
        if self._model._hid_row_inserted is not None:
            self._model.handler_unblock(self._model._hid_row_inserted)

        self._model.row_changed(self._model.get_path(itr), itr)

        if autosize:
            self._table.columns_autosize()
        if select:
            self._table.set_cursor(self._model[itr].path)


    def extend(self, rows, select=False, autosize=True):
        for r in rows:
            self.append(r, select, autosize)


    def clear(self):
        del self[:]


    def insert(self, index, row, select=True, autosize=True):
        if not isinstance(row, (list, tuple)):
            row = (row,)

        if self._model._hid_row_inserted is not None:
            self._model.handler_block(self._model._hid_row_inserted)
        if self._model._hid_row_changed is not None:
            self._model.handler_block(self._model._hid_row_changed)
        itr = self._model.insert(index, row)
        if self._model._hid_row_changed is not None:
            self._model.handler_unblock(self._model._hid_row_changed)
        if self._model._hid_row_inserted is not None:
            self._model.handler_unblock(self._model._hid_row_inserted)

        self._model.row_changed(self._model.get_path(itr), itr)

        if autosize:
            self._table.columns_autosize()
        if select:
            self._table.set_cursor(self._model[itr].path)


    def __nonzero__(self):
        return self._model.__nonzero__()

    def __len__(self):
        return len(self._model)


    def __iadd__(self, other):
        self.append(other)
        return self


    def __setitem__(self, index, other):
        if not isinstance(other, (list, tuple, Table.Row)):
            other = (other,)
        try:
            if self._model._hid_row_inserted is not None:
                self._model.handler_block(self._model._hid_row_inserted)
            if self._model._hid_row_changed is not None:
                self._model.handler_block(self._model._hid_row_changed)
            self._model[index] = other
            if self._model._hid_row_changed is not None:
                self._model.handler_unblock(self._model._hid_row_changed)
            if self._model._hid_row_inserted is not None:
                self._model.handler_unblock(self._model._hid_row_inserted)

            p = (index,)
            self._model.row_changed(p, self._model.get_iter(p))

        except TypeError, e:
            raise IndexError("index out of range")


    def __getitem__(self, index):
        try:
            items = self._model[index]
        except TypeError, e:
            raise IndexError("index out of range")

        return Table.Row(items)


    def __delitem__(self, index):
        try:
            del self._model[index]
        except TypeError, e:
            raise IndexError("index out of range")


    def __contains__(self, row):
        for r in self._model:
            if row in r:
                return True
        return False


    def __getslice__(self, start, end):
        slice = []

        l = len(self._model)
        while start < 0:
            start += l
        while end < 0:
            end += l

        start = min(start, l)
        end = min(end, l) # l[:] -> l[0 : maxlistindex]

        for i in xrange(start, end):
            slice.append(Table.Row(self._model[i]))
        return slice


    def __setslice__(self, start, end, slice):
        l = len(self._model)
        while start < 0:
            start += l
        while end < 0:
            end += l

        del self[start : end]

        # just insert len(slice) items
        l2 = len(slice)
        if end - start > l2:
            end = start + l2
        for j, i in enumerate(xrange(start, end)):
            row = list(slice[j])


            # extend row if necessary
            lr = len(row)
            lt = len(self.types)
            if lr < lt:
                for i in xrange(lr, lt):
                    t = self.types[i]
                    row.append(t())

            self.insert(i, row, select=False, autosize=False)


    def __delslice__(self, start, end):
        l = len(self._model)
        while start < 0:
            start += l
        while end < 0:
            end += l

        start = min(start, l)
        end = min(end, l) # l[:] -> l[0 : maxlistindex]

        while end > start:
            end -= 1
            del self._model[end]


class RichText(_EGWidget):
    """A Rich Text viewer

    Display text with basic formatting instructions. Formatting is
    done using a HTML subset.
    """

    class _Renderer(gtk.TextView):
        """Specialized TextView to render formatted texts.

        This class emits "follow-link" when user clicks somewhere.

        It implements Writer interface as specified in standard library
        "formatter" module.
        """
        bullet = None
        margin = 2
        signal_created = False

        def __init__(self, link_color="#0000ff",
                     foreground=None, background=None,
                     resource_provider=None):
            """RichText._Renderer constructor.

            @param link_color: color to use with links. String with color name
            or in internet format (3 pairs of RGB, in hexa, prefixed by
            #).
            @param foreground: default foreground color. Same spec as
            link_color.
            @param background: default background color. Same spec as
            link_color.
            @param resource_provider: function to provide unresolved resources.
            If some image could not be handled as a file, this function
            will be called and it should return an gtk.gdk.Pixbuf.
            Since http://url.com/file will always be unresolved, you
            may use this to provide remote file access to this class.
            """
            self.link_color = link_color or "#0000ff"
            self.foreground = foreground
            self.background = background
            self.resource_provider = resource_provider
            self.hovering_over_link = False

            b = gtk.TextBuffer()
            gtk.TextView.__init__(self, b)

            self.set_cursor_visible(False)
            self.set_editable(False)
            self.set_wrap_mode(gtk.WRAP_WORD)
            self.set_left_margin(self.margin)
            self.set_right_margin(self.margin)

            self.__setup_connections__()
            self.__setup_render__()
            self.__create_bullets__()


        def __create_bullets__(self):
            klass = RichText._Renderer
            if klass.bullet is None:
                width = height = 16
                dx = dy = 4

                colormap = gtk.gdk.colormap_get_system()
                visual = colormap.get_visual()

                white = colormap.alloc_color("#ffffff", True, True)
                black = colormap.alloc_color("#000000", True, True)

                pixmap = gtk.gdk.Pixmap(None, width, height, visual.depth)
                white_gc = pixmap.new_gc(foreground=white, background=black,
                                         fill=gtk.gdk.SOLID, line_width=1,
                                         line_style=gtk.gdk.LINE_SOLID)
                black_gc = pixmap.new_gc(foreground=black, background=white,
                                         fill=gtk.gdk.SOLID, line_width=1,
                                         line_style=gtk.gdk.LINE_SOLID)
                pixmap.draw_rectangle(white_gc, True, 0, 0, width, height)
                pixmap.draw_arc(black_gc, True, dx, dy,
                                width - dx * 2, height - dy * 2,
                                0, 23040)


                pixbuf = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, True, 8,
                                        width, height)
                pixbuf = pixbuf.get_from_drawable(pixmap, colormap, 0, 0, 0, 0,
                                                  width, height)
                pixbuf = pixbuf.add_alpha(True, chr(255), chr(255), chr(255))
                klass.bullet = pixbuf


        def __setup_connections__(self):
            hand_cursor = gtk.gdk.Cursor(gtk.gdk.HAND2)
            regular_cursor = gtk.gdk.Cursor(gtk.gdk.XTERM)
            K_Return = gtk.gdk.keyval_from_name("Return")
            K_KP_Enter = gtk.gdk.keyval_from_name("KP_Enter")
            K_Home = gtk.gdk.keyval_from_name("Home")
            K_End = gtk.gdk.keyval_from_name("End")

            if not self.__class__.signal_created:
                gobject.signal_new("follow-link", RichText._Renderer,
                                   gobject.SIGNAL_RUN_LAST,
                                   gobject.TYPE_NONE,
                                   (gobject.TYPE_STRING,
                                    gobject.TYPE_ULONG))
                self.__class__.signal_created = True


            def get_link(itr):
                tags = itr.get_tags()
                for tag in tags:
                    href = tag.get_data("href")
                    if href is not None:
                        return href
                return None

            def follow_if_link(text_view, itr):
                href = get_link(itr)
                if href:
                    self.emit("follow-link", href, itr.get_offset())

            def key_press_event(text_view, event):
                if event.keyval in (K_Return, K_KP_Enter):
                    b = text_view.get_buffer()
                    itr = b.get_iter_at_mark(b.get_insert())
                    follow_if_link(text_view, itr)
                elif event.keyval == K_Home:
                    itr = text_view.get_buffer().get_start_iter()
                    text_view.scroll_to_iter(itr, 0.0, False)
                elif event.keyval == K_End:
                    itr = text_view.get_buffer().get_end_iter()
                    text_view.scroll_to_iter(itr, 0.0, False)
            self.connect("key-press-event", key_press_event)

            def event_after(text_view, event):
                if event.type != gtk.gdk.BUTTON_RELEASE:
                    return False

                if event.button != 1:
                    return False

                b = text_view.get_buffer()

                # we shouldn't follow a link if the user has selected something
                try:
                    start, end = b.get_selection_bounds()
                except ValueError:
                    pass
                else:
                    if start.get_offset() != end.get_offset():
                        return False

                x, y = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET,
                                                         int(event.x),
                                                         int(event.y))
                itr = text_view.get_iter_at_location(x, y)
                follow_if_link(text_view, itr)
                return False
            self.connect("event-after", event_after)

            def set_cursor_if_appropriate(text_view, x, y):
                b = text_view.get_buffer()
                itr = text_view.get_iter_at_location(x, y)

                self.hovering_over_link = get_link(itr)
                if self.hovering_over_link:
                    cursor = hand_cursor
                else:
                    cursor = regular_cursor

                win = text_view.get_window(gtk.TEXT_WINDOW_TEXT)
                win.set_cursor(cursor)

            def motion_notify_event(text_view, event):
                x, y = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET,
                                                         int(event.x),
                                                         int(event.y))
                set_cursor_if_appropriate(text_view, x, y)
                text_view.window.get_pointer()
                return False
            self.connect("motion-notify-event", motion_notify_event)

            def visibility_notify_event(text_view, event):
                wx, wy, mod = text_view.window.get_pointer()
                x, y = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET,
                                                         wx, wy)
                set_cursor_if_appropriate(text_view, x, y)
                return False
            self.connect("visibility-notify-event", visibility_notify_event)


            def after_realize(text_view):
                colormap = self.get_colormap()
                if self.background:
                    bg = colormap.alloc_color(self.background, True, True)
                    w = text_view.get_window(gtk.TEXT_WINDOW_TEXT)
                    w.set_background(bg)
                    w = text_view.get_window(gtk.TEXT_WINDOW_WIDGET)
                    w.set_background(bg)
            self.connect_after("realize", after_realize)


        def __setup_render__(self):
            self.buffer = self.get_buffer()
            itr = self.buffer.get_start_iter()

            k = {}
            if self.foreground:
                k["foreground"] = self.foreground

            create_tag = self.buffer.create_tag
            self.tags = {
                "default": create_tag("default", **k),
                "bold": create_tag("bold", weight=pango.WEIGHT_BOLD),
                "italic": create_tag("italic", style=pango.STYLE_ITALIC),
                "link": create_tag("link", foreground=self.link_color,
                                   underline=pango.UNDERLINE_SINGLE),
                "h1": create_tag("h1", scale=pango.SCALE_XX_LARGE),
                "h2": create_tag("h2", scale=pango.SCALE_X_LARGE),
                "h3": create_tag("h3", scale=pango.SCALE_LARGE),
                "monospaced": create_tag("monospaced", font="monospace"),
                "center": create_tag("center",
                                     justification=gtk.JUSTIFY_CENTER),
                "left":  create_tag("left",
                                    justification=gtk.JUSTIFY_LEFT),
                "right": create_tag("right",
                                    justification=gtk.JUSTIFY_RIGHT),
                "justified": create_tag("justified",
                                        justification=gtk.JUSTIFY_FILL)
                }
            self.tags["default"].set_priority(0)

            self.font = []
            self.link = []
            self.divs = []
            self.margin = []


        def send_paragraph(self, blankline):
            if blankline:
                self.send_flowing_data("\n")


        def send_line_break(self):
            self.send_paragraph(1)


        def send_flowing_data(self, data):
            itr = self.buffer.get_end_iter()
            t = [self.tags["default"]] + self.font + self.link
            for div in self.divs:
                t.extend(div)
            self.buffer.insert_with_tags(itr, data, *t)

        def send_literal_data(self, data):
            itr = self.buffer.get_end_iter()
            t = [self.tags["default"], self.tags["monospaced"]] + \
                self.font + self.link
            for div in self.divs:
                t.extend(div)
            self.buffer.insert_with_tags(itr, data, *t)


        def send_hor_rule(self):
            itr = self.buffer.get_end_iter()
            anchor = self.buffer.create_child_anchor(itr)
            w = gtk.HSeparator()
            w.show()
            def size_allocate(widget, rect):
                lm = self.get_left_margin()
                rm = self.get_right_margin()
                width = max(rect.width - lm - rm - 1, 0)
                w.set_size_request(width, -1)

            self.connect_after("size-allocate", size_allocate)
            self.add_child_at_anchor(w, anchor)


        def new_margin(self, margin, level):
            itr = self.buffer.get_end_iter()
            self.margin.append((margin, level))


        def send_label_data(self, data):
            itr = self.buffer.get_end_iter()
            t = self.font + self.link + [self.tags["bold"]]
            for div in self.divs:
                t.extend(div)

            margin, level = self.margin[-1]
            self.buffer.insert_with_tags(itr, '\t' * level, *t)
            if data == '*' and self.bullet:
                self.buffer.insert_pixbuf(itr, self.bullet)
            else:
                self.buffer.insert_with_tags(itr, data, *t)
            self.buffer.insert_with_tags(itr, ' ', *t)


        def add_image(self, filename, width, height):
            try:
                pixbuf = gtk.gdk.pixbuf_new_from_file(filename)
            except gobject.GError:
                if self.resource_provider:
                    pixbuf = self.resource_provider(filename)
                else:
                    raise ValueError("No resource provider for %r" % filename)

            if not pixbuf:
                self.send_flowing_data("[%s]" % filename)
                return

            ow = pixbuf.get_width()
            oh = pixbuf.get_height()
            p = float(ow) / float(oh)

            if width > 0 and height < 1:
                height = int(width / p)
            elif height > 0 and width < 1:
                width = int(height * p)
            if width > 0 and height > 0:
                pixbuf = pixbuf.scale_simple(width, height,
                                             gtk.gdk.INTERP_BILINEAR)
            itr = self.buffer.get_end_iter()
            self.buffer.insert_pixbuf(itr, pixbuf)


        def start_link(self, url, name=None):
            t = self.buffer.create_tag()
            t.set_data("href", url)
            if name:
                self.buffer.create_mark(name,
                                        self.buffer.get_end_iter(), True)
            self.link = [self.tags["link"], t]


        def end_link(self):
            self.link = []


        def start_div(self, attrs):
            div = []
            if "align" in attrs:
                align = attrs["align"]
                try:
                    div.append(self.tags[align])
                except KeyError, e:
                    print >> sys.stderr, "Unknown alignment %r" % align
            self.divs.append(div)


        def end_div(self):
            if self.divs:
                self.divs.pop()
            self.send_paragraph(1)


        def new_font(self, font):
            if isinstance(font, (tuple, list)):
                def append_unique(v):
                    f = self.font
                    if v not in f:
                        f.append(v)

                size, is_italic, is_bold, is_tt = font
                if   size == "h1":
                    append_unique(self.tags["h1"])
                elif size == "h2":
                    append_unique(self.tags["h2"])
                elif size == "h3":
                    append_unique(self.tags["h3"])

                if is_italic:
                    append_unique(self.tags["italic"])
                if is_bold:
                    append_unique(self.tags["bold"])

            elif isinstance(font, dict):
                t = {}
                family = font.get("family")
                size = font.get("size")
                color = font.get("color")
                background = font.get("bgcolor")
                if family:
                    t["family"] = family
                if size:
                    t["size-points"] = int(size)
                if color:
                    t["foreground"] = color
                if background:
                    t["background"] = background
                self.font.append(self.buffer.create_tag(None, **t))
            else:
                self.font = []


        def goto(self, anchor):
            mark = self.buffer.get_mark(anchor)
            if mark is not None:
                self.scroll_mark_onscreen(mark)
            else:
                raise ValueError("Inexistent anchor: %r" % anchor)


        def reset(self):
            a = self.buffer.get_start_iter()
            b = self.buffer.get_end_iter()
            self.buffer.delete(a, b)


    class _Parser(htmllib.HTMLParser):
        """HTML subset parser"""
        def anchor_bgn(self, href, name, type):
            htmllib.HTMLParser.anchor_bgn(self, href, name, type)
            self.formatter.push_link(href, name)


        def anchor_end(self):
            self.formatter.pop_link()


        def handle_image(self, source, alt, ismap, align, width, height):
            self.formatter.add_image(source, width, height)


        def start_font(self, attrs):
            k = dict(attrs)
            self.formatter.push_font(k)


        def end_font(self):
            self.formatter.pop_font()


        def start_div(self, attrs):
            k = dict(attrs)
            self.formatter.push_div(k)


        def end_div(self):
            self.formatter.pop_div()


    class _Formatter(formatter.AbstractFormatter):
        """HTML subset formatter"""
        def add_image(self, filename, width, height):
            self.writer.add_image(filename, width, height)

        def push_link(self, url, name):
            self.writer.start_link(url, name)

        def pop_link(self):
            self.writer.end_link()


        def push_font(self, font):
            if isinstance(font, dict):
                self.writer.new_font(font)
            else:
                formatter.AbstractFormatter.push_font(self, font)


        def push_div(self, attrs):
            self.writer.start_div(attrs)


        def pop_div(self):
            self.writer.end_div()

    bgcolor = _gen_ro_property("bgcolor")
    fgcolor = _gen_ro_property("fgcolor")
    link_color = _gen_ro_property("link_color")
    padding = 5

    def __init__(self, id, text="", label=None, link_color="blue",
                 fgcolor=None, bgcolor=None, callback=None,
                 img_provider=None, expand_policy=None,
                 active=True, visible=True):
        """RichText constructor.

        @param id: unique identifier.
        @param text: text to use in this viewer.
        @param label: label to display in the widget frame around the viewer.
        If None, no label or frame will be shown.
        @param link_color: color to use for links.
        @param fgcolor: color to use for foreground (text)
        @param bgcolor: color to use for background.
        @param callback: function (or list of functions) to call when
        user clicks a link. Links to anchor will automatically make
        the anchor/mark visible and then callback. Function will get
        as parameters:
        - App reference
        - RichText reference
        - href contents (string)
        - offset from buffer begin (integer)
        @param img_provider: if images could not be resolved, call this
        function. It should get an address (string) and return an
        eagle.Image. Eagle already provides a handle to addresses
        prefixed with "eagle://", the following part should be an
        eagle.Image id, and the image should be live (not garbage
        collected) when displaying it, so remember to keep a
        reference to it! You may use img_provider to download
        files from webservers and stuff like that.
        Function signature:
        def img_provider(filename):
        return eagle.Image(...)
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        _EGWidget.__init__(self, id, expand_policy,
                           active=active, visible=visible)
        self.__label = label
        self._callback = _callback_tuple(callback)
        self.link_color = link_color
        self.foreground = fgcolor
        self.background = bgcolor
        self.img_provider = img_provider

        self.__setup_gui__()
        self.__setup_parser__()
        self.__setup_connections__()
        self.set_text(text)


    def __setup_gui__(self):
        def img_provider(filename):
            img = None
            if filename.startswith("eagle://"):
                id = filename[len("eagle://") :]
                img = Image.__get_by_id__(id)
            elif self.img_provider:
                img = self.img_provider(filename)

            if img:
                return img.__get_gtk_pixbuf__()
            else:
                error("Could not find image %r" % filename)

        self._sw = gtk.ScrolledWindow()
        self._renderer = RichText._Renderer(link_color=self.link_color,
                                            foreground=self.fgcolor,
                                            background=self.bgcolor,
                                            resource_provider=img_provider)

        self._sw.set_border_width(self.padding)
        self._sw.set_shadow_type(gtk.SHADOW_IN)
        if self.label is not None:
            self._frame = gtk.Frame(self.label)
            self._frame.add(self._sw)
            root = self._frame
            self._frame.set_shadow_type(gtk.SHADOW_OUT)
        else:
            root = self._sw

        self._sw.add(self._renderer)
        self._sw.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        self._sw.show_all()
        self._widgets = (root,)


    def __setup_parser__(self):
        self._formatter = RichText._Formatter(self._renderer)
        self._parser = RichText._Parser(self._formatter)


    def __setup_connections__(self):
        def callback(text_view, href, offset):
            if href.startswith("#"):
                try:
                    text_view.goto(href[1 :])
                except ValueError, e:
                    error(str(e))

            for c in self._callback:
                c(self.app, self, href, offset)
        self._renderer.connect("follow-link", callback)


    def focus(self):
        self._renderer.grab_focus()


    def set_text(self, text):
        """Replace current text"""
        self._text = text
        self._renderer.reset()
        self.__setup_parser__()
        self._parser.feed(self.text)


    def get_text(self):
        """Return current text, with formatting tags"""
        return self._text

    text = property(get_text, set_text)


    def append(self, text):
        self._text += text
        self._parser.feed(text)


    def set_label(self, label):
        if self.__label is None:
            raise ValueError("You cannot change label of widget created "
                             "without one. Create it with placeholder! "
                             "(label='')")
        self.__label = label
        self._frame.set_label(self.__label)


    def get_label(self):
        return self.__label

    label = property(get_label, set_label)


    def __str__(self):
        return "%s(id=%r, label=%r, link_color=%r, fgcolor=%r, bgcolor=%r)"%\
            (self.__class__.__name__, self.id, self.label, self.link_color,
             self.fgcolor, self.bgcolor)
    __repr__ = __str__


class Button(_EGWidget):
    """A push button.
    """
    stock = _gen_ro_property("stock")
    callback = _gen_ro_property("callback")

    stock_items = (
        "new",
        "about",
        "help",
        "quit",
        "add",
        "remove",
        "edit",
        "refresh",
        "update",
        "yes",
        "no",
        "zoom_100",
        "zoom_in",
        "zoom_out",
        "zoom_fit",
        "undo",
        "execute",
        "stop",
        "open",
        "save",
        "save_as",
        "properties",
        "preferences",
        "print",
        "print_preview",
        "ok",
        "cancel",
        "apply",
        "close",
        "clear",
        "convert",
        "next",
        "back",
        "up",
        "down",
        "font",
        "color",
        "media:play",
        "media:pause",
        "media:stop",
        "media:previous",
        "media:next",
        "media:forward",
        "media:rewind",
        )


    _gtk_stock_map = {
        "new": gtk.STOCK_NEW,
        "about": gtk.STOCK_ABOUT,
        "help": gtk.STOCK_HELP,
        "quit": gtk.STOCK_QUIT,
        "add": gtk.STOCK_ADD,
        "remove": gtk.STOCK_REMOVE,
        "edit": gtk.STOCK_EDIT,
        "refresh": gtk.STOCK_REFRESH,
        "update": gtk.STOCK_REFRESH,
        "yes": gtk.STOCK_YES,
        "no": gtk.STOCK_NO,
        "zoom_100": gtk.STOCK_ZOOM_100,
        "zoom_in": gtk.STOCK_ZOOM_IN,
        "zoom_out": gtk.STOCK_ZOOM_OUT,
        "zoom_fit": gtk.STOCK_ZOOM_FIT,
        "undo": gtk.STOCK_UNDO,
        "execute": gtk.STOCK_EXECUTE,
        "stop": gtk.STOCK_STOP,
        "open": gtk.STOCK_OPEN,
        "save": gtk.STOCK_SAVE,
        "save_as": gtk.STOCK_SAVE_AS,
        "properties": gtk.STOCK_PROPERTIES,
        "preferences": gtk.STOCK_PREFERENCES,
        "print": gtk.STOCK_PRINT,
        "print_preview": gtk.STOCK_PRINT_PREVIEW,
        "ok": gtk.STOCK_OK,
        "cancel": gtk.STOCK_CANCEL,
        "apply": gtk.STOCK_APPLY,
        "close": gtk.STOCK_CLOSE,
        "clear": gtk.STOCK_CLEAR,
        "convert": gtk.STOCK_CONVERT,
        "next": gtk.STOCK_GO_FORWARD,
        "back": gtk.STOCK_GO_BACK,
        "up": gtk.STOCK_GO_UP,
        "down": gtk.STOCK_GO_DOWN,
        "font": gtk.STOCK_SELECT_FONT,
        "color": gtk.STOCK_SELECT_COLOR,
        "media:play": gtk.STOCK_MEDIA_PLAY,
        "media:pause": gtk.STOCK_MEDIA_PAUSE,
        "media:stop": gtk.STOCK_MEDIA_STOP,
        "media:previous": gtk.STOCK_MEDIA_PREVIOUS,
        "media:next": gtk.STOCK_MEDIA_NEXT,
        "media:forward": gtk.STOCK_MEDIA_FORWARD,
        "media:rewind": gtk.STOCK_MEDIA_REWIND,
        }


    def __init__(self, id, label="", stock=None, image=None, callback=None,
                 expand_policy=None, active=True, visible=True):
        """Push button constructor.

        It may be a stock button, that is, a pre-defined button that may
        have an associated image and translated label text.

        It may have an image either by using a stock button or giving image
        as parameter, but this image will only be visible if system
        configuration wants that, GTK does that with gtk-button-images
        property present on gtk.Settings.

        @param label: what text to show, if stock isn't provided.
        @param stock: optional. One of L{stock_items}.
        @param image: image filename (or L{Image} instance) to use.
        @param callback: the function (or list of functions) to call
        when button is pressed. Function will get as parameter:
        - App reference
        - Button reference
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        if expand_policy is None:
            expand_policy = ExpandPolicy.Fill()
        self.__label = label
        self.__image = image
        self.stock = stock
        self.callback = _callback_tuple(callback)

        # Check if provided stock items are implemented
        for i in self.stock_items:
            if i not in self._gtk_stock_map:
                print >> sys.stderr, \
                    "Stock item %s missing in implementation map!" % (i,)

        _EGWidget.__init__(self, id, expand_policy=expand_policy,
                           active=active, visible=visible)

        self.__setup_gui__()
        self.__setup_connections__()


    def __setup_gui__(self):
        k = {}
        if self.stock:
            self._button = gtk.Button(stock=self._gtk_stock_map[self.stock])
        elif self.label:
            self._button = gtk.Button(label=self.label)
        else:
            self._button = gtk.Button()

        if self.__image:
            self.image = self.__image

        self._button.set_name(self.id)
        self._widgets = (self._button,)


    def set_label(self, label):
        self.__label = label
        self._button.set_label(label)


    def get_label(self):
        return self.__label

    label = property(get_label, set_label)


    def set_image(self, image):
        if isinstance(image, Image):
            img = image
        elif isinstance(image, basestring):
            img = Image(filename=image)
        else:
            raise ValueError("not supported image type: %r" % image)

        self.__image = image
        gtk_image = gtk.Image()
        gtk_image.set_from_pixbuf(img.__get_gtk_pixbuf__())
        self._button.set_image(gtk_image)


    def get_image(self):
        return self.__image

    image = property(get_image, set_image)


    def __setup_connections__(self):
        def callback(obj):
            for c in self.callback:
                c(self.app, self)
        self._button.connect("clicked", callback)


class AboutButton(Button, _AutoGenId):
    """Push button to show L{AboutDialog} of L{App}."""
    def __init__(self, id=None, expand_policy=None,
                 active=True, visible=True):
        """You may not provide id, it will be generated automatically"""
        def show_about(app_id, wid_id):
            self.app.show_about_dialog()
        Button.__init__(self, id or self.__get_id__(),
                        stock="about", callback=show_about,
                        expand_policy=expand_policy,
                        active=active, visible=visible)


class CloseButton(Button, _AutoGenId):
    """Push button to close L{App}."""
    def __init__(self, id=None, expand_policy=None,
                 active=True, visible=True):
        """You may not provide id, it will be generated automatically"""
        def close(app_id, wid_id):
            self.app.close()
        Button.__init__(self, id or self.__get_id__(),
                        stock="close", callback=close,
                        expand_policy=expand_policy,
                        active=active, visible=visible)


class QuitButton(Button, _AutoGenId):
    """Push button to quit all L{App}s."""
    def __init__(self, id=None, expand_policy=None,
                 active=True, visible=True):
        """You may not provide id, it will be generated automatically"""
        def c(app_id, wid_id):
            quit()
        Button.__init__(self, id or self.__get_id__(),
                        stock="quit", callback=c,
                        expand_policy=expand_policy,
                        active=active, visible=visible)


class HelpButton(Button, _AutoGenId):
    """Push button to show L{HelpDialog} of L{App}."""
    def __init__(self, id=None, expand_policy=None,
                 active=True, visible=True):
        """You may not provide id, it will be generated automatically"""
        def c(app_id, wid_id):
            self.app.show_help_dialog()
        Button.__init__(self, id or self.__get_id__(),
                        stock="help", callback=c,
                        expand_policy=expand_policy,
                        active=active, visible=visible)


class OpenFileButton(Button, _AutoGenId):
    """Push button to show dialog to choose an existing file."""
    def __init__(self, id=None, filename=None,
                 filter=None, multiple=False,
                 callback=None, expand_policy=None,
                 active=True, visible=True):
        """Constructor.

        @param id: may not be provided, it will be generated automatically.
        @param filename: default filename.
        @param filter: filter files to show, see L{FileChooser}.
        @param multiple: enable selection of multiple files.
        @param callback: function (or list of functions) to call back
        when file is selected. Function will get as parameters:
        - app reference.
        - widget reference.
        - file name or file list (if multiple).
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.

        @see: L{FileChooser}
        """
        def c(app_id, wid_id):
            f = self.app.file_chooser(action=FileChooser.ACTION_OPEN,
                                      filename=filename,
                                      filter=filter, multiple=multiple)
            if f is not None and callback:
                callback(self.app, self, f)
        Button.__init__(self, id or self.__get_id__(),
                        stock="open", callback=c,
                        expand_policy=expand_policy,
                        active=active, visible=visible)


class SelectFolderButton(Button, _AutoGenId):
    """Push button to show dialog to choose an existing folder/directory."""
    def __init__(self, id=None, filename=None, callback=None,
                 expand_policy=None, active=True, visible=True):
        """Constructor.

        @param id: may not be provided, it will be generated automatically.
        @param filename: default filename.
        @param callback: function (or list of functions) to call back
        when file is selected. Function will get as parameters:
        - app reference.
        - widget reference.
        - directory/folder name.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.

        @see: L{FileChooser}
        """
        def c(app_id, wid_id):
            f = self.app.file_chooser(action=FileChooser.ACTION_SELECT_FOLDER,
                                      filename=filename)
            if f is not None and callback:
                callback(self.app, self, f)
        Button.__init__(self, id or self.__get_id__(),
                        stock="open", callback=c,
                        expand_policy=expand_policy,
                        active=active, visible=visible)


class SaveFileButton(Button, _AutoGenId):
    """Push button to show dialog to choose a file to save."""
    def __init__(self, id=None, filename=None,
                 filter=None, callback=None, expand_policy=None,
                 active=True, visible=True):
        """Constructor.

        @param id: may not be provided, it will be generated automatically.
        @param filename: default filename.
        @param filter: filter files to show, see L{FileChooser}.
        @param callback: function (or list of functions) to call back
        when file is selected. Function will get as parameters:
        - app reference.
        - widget reference.
        - file name.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.

        @see: L{FileChooser}
        """
        def c(app_id, wid_id):
            f = self.app.file_chooser(action=FileChooser.ACTION_SAVE,
                                      filename=filename,
                                      filter=filter)
            if f is not None and callback:
                callback(self.app, self, f)
        Button.__init__(self, id or self.__get_id__(),
                        stock="save", callback=c,
                        expand_policy=expand_policy,
                        active=active, visible=visible)


class PreferencesButton(Button, _AutoGenId):
    """Push button to show L{PreferencesDialog} of L{App}."""
    def __init__(self, id=None, expand_policy=None,
                 active=True, visible=True):
        """You may not provide id, it will be generated automatically"""
        def c(app_id, wid_id):
            f = self.app.show_preferences_dialog()
        Button.__init__(self, id or self.__get_id__(),
                        stock="preferences", callback=c,
                        active=active, visible=visible)


class HSeparator(_EGWidget, _AutoGenId):
    """Horizontal separator"""
    def __init__(self, id=None, expand_policy=None,
                 active=True, visible=True):
        """You may not provide id, it will be generated automatically"""
        if expand_policy is None:
            expand_policy = ExpandPolicy.FillHorizontal()
        _EGWidget.__init__(self, id or self.__get_id__(),
                           expand_policy=expand_policy,
                           active=active, visible=visible)
        self._wid = gtk.HSeparator()
        self._wid.set_name(self.id)
        self._widgets = (self._wid,)


class VSeparator(_EGWidget, _AutoGenId):
    """Horizontal separator"""
    def __init__(self, id=None, expand_policy=None,
                 active=True, visible=True):
        """You may not provide id, it will be generated automatically"""
        if expand_policy is None:
            expand_policy = ExpandPolicy.FillVertical()
        _EGWidget.__init__(self, id or self.__get_id__(),
                           expand_policy=expand_policy,
                           active=active, visible=visible)
        self._wid = gtk.VSeparator()
        self._wid.set_name(self.id)
        self._widgets = (self._wid,)


class Label(_EGDataWidget, _AutoGenId):
    """Text label"""
    label = _gen_ro_property("label")

    LEFT   = 0.0
    RIGHT  = 1.0
    CENTER = 0.5
    TOP    = 0.0
    MIDDLE = 0.5
    BOTTOM = 1.0

    def __init__(self, id=None, label="",
                 halignment=LEFT, valignment=MIDDLE, expand_policy=None,
                 active=True, visible=True):
        """Label constructor.

        @param id: may not be provided, it will be generated automatically.
        @param label: what this label will show.
        @param halignment: horizontal alignment, like L{LEFT}, L{RIGHT} or
        L{CENTER}.
        @param valignment: vertical alignment, like L{TOP}, L{BOTTOM} or
        L{MIDDLE}.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        if expand_policy is None:
            expand_policy = ExpandPolicy.Nothing()

        _EGDataWidget.__init__(self, id or self.__get_id__(), False,
                               expand_policy=expand_policy,
                               active=active, visible=visible)
        self.label = label

        self._wid = gtk.Label(self.label)
        self._wid.set_name(self.id)
        self._wid.set_alignment(xalign=halignment, yalign=valignment)
        self._widgets = (self._wid,)


    def get_value(self):
        return self._wid.get_text()


    def set_value(self, value):
        self._wid.set_text(str(value))


    def __str__(self):
        return "%s(id=%r, label=%r)" % \
            (self.__class__.__name__, self.id, self.label)


class NativeSlot(_EGWidget, _AutoGenId):
    """Native Slot to plug in system-dependent components.

    While Eagle and other toolkits as GTK, QT and others try to
    provide all the widgets you may need, occasionally you might need
    more specific extensions that are provided by third
    parties. Usually these extensions are integrated by means of the
    most low-level components, usually called native windows, surfaces
    or slots. In Eagle these are called "NativeSlots".

    NativeSlots will be visually integrated in your application,
    respecting the provided expand_policy, but they'll draw nothing by
    default, instead they provide the native resource with
    L{get_resource()}, which will return system-dependent resources
    that could be used by third parties.

    On X11 systems, L{get_resource()} will return 'Window'
    identification number, that can be used by third party like
    MPlayer to draw things on it. Example: one can create NativeSlot,
    then use get_resource() and give this value as MPlayer's '-wid'
    parameter.

    @warning: this breaks portability of your applications, avoid using it.
    @warning: not supported on Eagle-GTK on MS Windows.
    """
    def __init__(self, id=None,  expand_policy=None):
        """NativeSlot constructor.

        @param id: may not be provided, it will be generated automatically.
        @param expand_policy: how this widget should fit space, see
        L{ExpandPolicy.Policy.Rule}.
        """
        _EGWidget.__init__(self, id or self.__get_id__(),
                            expand_policy=expand_policy)
        self._wid = gtk.EventBox()
        self._wid.set_name(self.id)
        self._widgets = (self._wid,)

    def get_resource(self):
        return self._wid.window.xid


def information(message):
    """Show info message to user."""

    d = gtk.MessageDialog(type=gtk.MESSAGE_INFO,
                          message_format=message,
                          buttons=gtk.BUTTONS_CLOSE)
    d.run()
    d.destroy()
    return
info = information


def warning(message):
    """Show warning message to user."""

    d = gtk.MessageDialog(type=gtk.MESSAGE_WARNING,
                          message_format=message,
                          buttons=gtk.BUTTONS_CLOSE)
    d.run()
    d.destroy()
    return
warn = warning


def error(message):
    """Show error message to user."""

    d = gtk.MessageDialog(type=gtk.MESSAGE_ERROR,
                          message_format=message,
                          buttons=gtk.BUTTONS_CLOSE)
    d.run()
    d.destroy()
    return
err = error


def yesno(message, yesdefault=False):
    """Show yes/no message to user.

    @param yesdefault: if yes should be the default action.
    """

    d = gtk.MessageDialog(type=gtk.MESSAGE_QUESTION,
                          message_format=message,
                          buttons=gtk.BUTTONS_YES_NO)
    if yesdefault:
        d.set_default_response(gtk.RESPONSE_YES)
    else:
        d.set_default_response(gtk.RESPONSE_NO)

    r = d.run()
    d.destroy()

    if r == gtk.RESPONSE_YES:
        return True
    elif r == gtk.RESPONSE_NO:
        return False
    else:
        return yesdefault



def confirm(message, okdefault=False):
    """Show confirm message to user.

    @param okdefault: if ok should be the default action.
    """

    d = gtk.MessageDialog(type=gtk.MESSAGE_QUESTION,
                          message_format=message,
                          buttons=gtk.BUTTONS_OK_CANCEL)
    if okdefault:
        d.set_default_response(gtk.RESPONSE_OK)
    else:
        d.set_default_response(gtk.RESPONSE_CANCEL)

    r = d.run()
    d.destroy()

    if r == gtk.RESPONSE_OK:
        return True
    elif r == gtk.RESPONSE_CANCEL:
        return False
    else:
        return okdefault



def run():
    """Enter the event loop"""
    try:
        gtk.main()
    except KeyboardInterrupt:
        raise SystemExit("User quit using Control-C")

def quit():
    """Quit the event loop"""
    gtk.main_quit()


def get_app_by_id(app_id):
    """Given an App unique identifier, return the reference to it."""
    if app_id is None:
        try:
            return _apps.values()[0]
        except IndexError, e:
            raise ValueError("No application defined!")
    elif isinstance(app_id, (str, unicode)):
        try:
            return _apps[app_id]
        except KeyError, e:
            raise ValueError("Application id \"%s\" doesn't exists!" % \
                                 app_id)
    elif isinstance(app_id, App):
        return app_id
    else:
        raise ValueError("app_id must be string or App instance!")


def get_widget_by_id(widget_id, app_id=None):
    """Given an Widget unique identifier, return the reference to it.

    If app_id is not provided, will use the first App found.

    @attention: Try to always provide app_id since it may lead to problems if
    your program have more than one App.
    """
    app = get_app_by_id(app_id)

    if app:
        w = app.get_widget_by_id(widget_id)
        if not w:
            raise ValueError("Widget id \"%s\" doesn't exists!" % widget_id)
        else:
            return w


def get_value(widget_id, app_id=None):
    """Convenience function to get widget and call its get_value() method."""
    try:
        wid = get_widget_by_id(widget_id, app_id)
        return wid.get_value()
    except ValueError, e:
        raise ValueError(e)


def set_value(widget_id, value, app_id=None):
    """Convenience function to get widget and call its set_value() method."""
    try:
        wid = get_widget_by_id(widget_id, app_id)
        wid.set_value(value)
    except ValueError, e:
        raise ValueError(e)


def show(widget_id, app_id=None):
    """Convenience function to get widget and call its show() method."""
    try:
        wid = get_widget_by_id(widget_id, app_id)
        wid.show()
    except ValueError, e:
        raise ValueError(e)


def hide(widget_id, app_id=None):
    """Convenience function to get widget and call its hide() method."""
    try:
        wid = get_widget_by_id(widget_id, app_id)
        wid.hide()
    except ValueError, e:
        raise ValueError(e)


def set_visible(widget_id, visible=True, app_id=None):
    """Convenience function to get widget and call its set_visible() method."""
    try:
        wid = get_widget_by_id(widget_id, app_id)
        wid.set_visible(visible)
    except ValueError, e:
        raise ValueError(e)


def get_visible(widget_id, app_id=None):
    """Convenience function to get widget and call its get_visible() method.
    """
    try:
        wid = get_widget_by_id(widget_id, app_id)
        return wid.get_visible()
    except ValueError, e:
        raise ValueError(e)
is_visible = get_visible


def set_active(widget_id, active=True, app_id=None):
    """Convenience function to get widget and call its set_active() method."""
    try:
        wid = get_widget_by_id(widget_id, app_id)
        wid.set_active(active)
    except ValueError, e:
        raise ValueError(e)
enable = set_active


def set_inactive(widget_id, app_id=None):
    """Convenience function to get widget and call its set_inactive() method.
    """
    try:
        wid = get_widget_by_id(widget_id, app_id)
        wid.set_inactive()
    except ValueError, e:
        raise ValueError(e)
disable = set_inactive


def get_active(widget_id, app_id=None):
    """Convenience function to get widget and call its get_active() method.
    """
    try:
        wid = get_widget_by_id(widget_id, app_id)
        return wid.get_active()
    except ValueError, e:
        raise ValueError(e)
is_active = get_active
is_enabled = get_active


def close(app_id=None):
    """Convenience function to get app and call its close() method."""
    try:
        app = get_app_by_id(app_id)
        app.close()
    except ValueError, e:
        raise ValueError(e)


def get_desktop_size():
    return gtk.gdk.screen_width(), gtk.gdk.screen_height()