<commit_before>'''
Widget class
============

The :class:`Widget` class is base class required to create a Widget.
Our widget class is designed for:

    Event managed
        The widget interaction is build on top of event. If a property change,
        the widget will do something. If nothing change in the widget, nothing
        will be done. That's the main goal of the
        :class:`~kivy.properties.Property` class.

    Seperate widget and graphical representation
        We don't have a `draw()` method. The idea is to let you the possibility
        to create your own graphical representation outside the widget class.
        And you'll use all the available properties to do that.
        Every widget have his own :class:`~kivy.graphics.Canvas`.

    Bounding box / Collision
        Since the graphical representation is seperated, the position and size
        of the widget represent his bounding box. You can check if a point is
        inside the widget with :func:`Widget.collide_point`, or if a widget is
        colliding another widget with :func:`Widget.collide_widget`.


Usage of properties
-------------------

When you read the documentation, every property are described in the format::

    <name> is a <property class>, default to <default value>

For example::

    :data:`Widget.pos` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`Widget.x`, :data:`Widget.y`) properties.

If you want to know when a the pos attribute change (meaning when the widget
move), you can bind your own function like this::

    def callback_pos(instance, value):
        print 'the widget', instance, 'have moved to', value

    wid = Widget()
    wid.bind(pos=callback_pos)

'''

__all__ = ('Widget', 'WidgetException')

from kivy.event import EventDispatcher
from kivy.properties import NumericProperty, StringProperty, \
        AliasProperty, ReferenceListProperty, Property, ObjectProperty, \
        ListProperty
from kivy.graphics import Canvas
from kivy.base import EventLoop
from kivy.lang import Builder

Widget_forbidden_properties = ('touch_down', 'touch_move', 'touch_up')


class WidgetException(Exception):
    '''Fired when the widget got an exception
    '''
    pass


class Widget(EventDispatcher):
    '''Widget class. See module documentation for more informations.

    :Events:
        `on_touch_down`:
            Fired when a new touch appear
        `on_touch_move`:
            Fired when an existing touch is moved
        `on_touch_down`:
            Fired when an existing touch disapear
    '''

    # UID counter
    __widget_uid = 0

    def __new__(__cls__, *largs, **kwargs):
        self = super(Widget, __cls__).__new__(__cls__)

        # XXX for the moment, we need to create a uniq id for properties.
        # Properties need a identifier to the class instance. hash() and id()
        # are longer than using a custom __uid. I hope we can figure out a way
        # of doing that without require any python code. :)
        Widget.__widget_uid += 1
        self.__dict__['__uid'] = Widget.__widget_uid

        # First loop, link all the properties storage to our instance
        attrs_found = {}
        attrs = dir(__cls__)
        for k in attrs:
            attr = getattr(__cls__, k)
            if isinstance(attr, Property):
                if k in Widget_forbidden_properties:
                    raise Exception(
                        'The property <%s> have a forbidden name' % k)
                attr.link(self, k)
                attrs_found[k] = attr

        # Second loop, resolve all the reference
        for k in attrs:
            attr = getattr(__cls__, k)
            if isinstance(attr, Property):
                attr.link_deps(self, k)

        self.__properties = attrs_found

        # Then, return the class instance
        return self

    def __del__(self):
        # The thing here, since the storage of the property is inside the
        # Property class, we must remove ourself from the storage of each
        # Property. The usage is faster, the creation / deletion is longer.
        for attr in self.__properties.itervalues():
            attr.unlink(self)

    def __init__(self, **kwargs):
        super(Widget, self).__init__()

        # Register touch events
        self.register_event_type('on_touch_down')
        self.register_event_type('on_touch_move')
        self.register_event_type('on_touch_up')

        # Before doing anything, ensure the windows exist.
        EventLoop.ensure_window()

        # Auto bind on own handler if exist
        properties = self.__properties.keys()
        for func in dir(self):
            if not func.startswith('on_'):
                continue
            name = func[3:]
            if name in properties:
                self.bind(**{name: getattr(self, func)})

        # Create the default canvas
        self.canvas = Canvas()

        # Apply the existing arguments to our widget
        for key, value in kwargs.iteritems():
            if hasattr(self, key):
                setattr(self, key, value)

        # Apply all the styles
        if '__no_builder' not in kwargs:
            Builder.apply(self)

    def create_property(self, name):
        '''Create a new property at runtime.

        .. warning::

            This function is designed for the Kivy language, don't use it in
            your code. You should declare the property in your class instead of
            using this method.

        :Parameters:
            `name`: string
                Name of the property

        The class of the property cannot be specified, it will be always an
        :class:`~kivy.properties.ObjectProperty` class. The default value of the
        property will be None, until you set a new value.

        >>> mywidget = Widget()
        >>> mywidget.create_property('custom')
        >>> mywidget.custom = True
        >>> print mywidget.custom
        True
        '''
        prop = ObjectProperty(None)
        prop.link(self, name)
        prop.link_deps(self, name)
        self.__properties[name] = prop
        setattr(self, name, prop)


    #
    # Collision
    #
    def collide_point(self, x, y):
        '''Check if a point (x, y) is inside the widget bounding box.

        :Parameters:
            `x`: numeric
                X position of the point
            `y`: numeric
                Y position of the point

        :Returns:
            bool, True if the point is inside the bounding box

        >>> Widget(pos=(10, 10), size=(50, 50)).collide_point(40, 40)
        True
        '''
        return self.x <= x <= self.right and self.y <= y <= self.top

    def collide_widget(self, wid):
        '''Check if widget (bounding box) is colliding with our widget bounding
        box.

        :Parameters:
            `wid`: :class:`Widget` class
                Widget to collide to.

        :Returns:
            bool, True if the widget is colliding us.

        >>> wid = Widget(size=(50, 50))
        >>> wid2 = Widget(size=(50, 50), pos=(25, 25))
        >>> wid.collide_widget(wid2)
        True
        >>> wid2.pos = (55, 55)
        >>> wid.collide_widget(wid2)
        False
        '''
        if self.right < wid.x:
            return False
        if self.x > wid.right:
            return False
        if self.top < wid.y:
            return False
        if self.y > wid.top:
            return False
        return True


    #
    # Default event handlers
    #
    def on_touch_down(self, touch):
        '''Receive a touch down event

        :Parameters:
            `touch`: :class:`~kivy.input.motionevent.MotionEvent` class
                Touch received

        :Returns:
            bool. If True, the dispatching will stop.
        '''
        for child in self.children[:]:
            if child.dispatch('on_touch_down', touch):
                return True

    def on_touch_move(self, touch):
        '''Receive a touch move event.

        See :func:`on_touch_down` for more information
        '''
        for child in self.children[:]:
            if child.dispatch('on_touch_move', touch):
                return True

    def on_touch_up(self, touch):
        '''Receive a touch up event.

        See :func:`on_touch_down` for more information
        '''
        for child in self.children[:]:
            if child.dispatch('on_touch_up', touch):
                return True


    #
    # Events
    #
    def bind(self, **kwargs):
        '''Bind properties or event to handler.

        Example of usage::

            def my_x_callback(obj, value):
                print 'on object', obj', 'x changed to', value
            def my_width_callback(obj, value):
                print 'on object', obj, 'width changed to', value
            self.bind(x=my_x_callback, width=my_width_callback)
        '''
        super(Widget, self).bind(**kwargs)
        for key, value in kwargs.iteritems():
            if key.startswith('on_'):
                continue
            self.__properties[key].bind(self, value)

    def unbind(self, **kwargs):
        '''Unbind properties or event from handler

        See :func:`bind()` for more information.
        '''
        super(Widget, self).unbind(**kwargs)
        for key, value in kwargs.iteritems():
            if key.startswith('on_'):
                continue
            self.__properties[key].unbind(self, value)


    #
    # Tree management
    #
    def add_widget(self, widget):
        '''Add a new widget as a child of current widget

        :Parameters:
            `widget`: :class:`Widget`
                Widget to add in our children list.

        >>> root = Widget()
        >>> root.add_widget(Button())
        >>> slider = Slider()
        >>> root.add_widget(slider)
        '''
        if not isinstance(widget, Widget):
            raise WidgetException(
                'add_widget() can be used only with Widget classes.')
        widget.parent = self
        self.children = [widget] + self.children
        self.canvas.add(widget.canvas)

    def remove_widget(self, widget):
        '''Remove a widget from the children of current widget

        :Parameters:
            `widget`: :class:`Widget`
                Widget to add in our children list.

        >>> root = Widget()
        >>> button = Button()
        >>> root.add_widget(button)
        >>> root.remove_widget(button)
        '''
        if widget not in self.children:
            return
        self.children.remove(widget)
        self.children = self.children[:]
        self.canvas.remove(widget.canvas)
        widget.parent = None

    def clear_widgets(self):
        '''Remove all widgets added to the widget.
        '''
        remove_widget = self.remove_widget
        for child in self.children[:]:
            remove_widget(child)

    def get_root_window(self):
        '''Return the root window

        :Returns:
            Instance of the root window. Can be
            :class:`~kivy.core.window.WindowBase` or
            :class:`Widget`
        '''
        if self.parent:
            return self.parent.get_root_window()

    def get_parent_window(self):
        '''Return the parent window

        :Returns:
            Instance of the root window. Can be
            :class:`~kivy.core.window.WindowBase` or
            :class:`Widget`
        '''
        if self.parent:
            return self.parent.get_parent_window()

    def to_widget(self, x, y, relative=False):
        '''Return the coordinate from window to local widget'''
        if self.parent:
            x, y = self.parent.to_widget(x, y)
        return self.to_local(x, y, relative=relative)

    def to_window(self, x, y, initial=True, relative=False):
        '''Transform local coordinate to window coordinate'''
        if not initial:
            x, y = self.to_parent(x, y, relative=relative)
        if self.parent:
            return self.parent.to_window(x, y, initial=False, relative=relative)
        return (x, y)

    def to_parent(self, x, y, relative=False):
        '''Transform local coordinate to parent coordinate

        :Parameters:
            `relative`: bool, default to False
                Change to True is you want to translate relative position from
                widget to his parent.
        '''
        if relative:
            return (x + self.x, y + self.y)
        return (x, y)

    def to_local(self, x, y, relative=False):
        '''Transform parent coordinate to local coordinate

        :Parameters:
            `relative`: bool, default to False
                Change to True is you want to translate a coordinate to a
                relative coordinate from widget.
        '''
        if relative:
            return (x - self.x, y - self.y)
        return (x, y)


    #
    # Properties
    #
    def setter(self, name):
        '''Return the setter of a property. Useful if you want to directly bind
        a property to another.

        For example, if you want to position one widget next to you ::

            self.bind(right=nextchild.setter('x'))
        '''
        return self.__properties[name].__set__

    def getter(self, name):
        '''Return the getter of a property.
        '''
        return self.__properties[name].__get__

    x = NumericProperty(0)
    '''X position of the widget.

    :data:`x` is a :class:`~kivy.properties.NumericProperty`, default to 0.
    '''

    y = NumericProperty(0)
    '''Y position of the widget.

    :data:`y` is a :class:`~kivy.properties.NumericProperty`, default to 0.
    '''

    width = NumericProperty(100)
    '''Width of the widget.

    :data:`width` is a :class:`~kivy.properties.NumericProperty`, default
    to 100.
    '''

    height = NumericProperty(100)
    '''Height of the widget.

    :data:`height` is a :class:`~kivy.properties.NumericProperty`, default
    to 100.
    '''

    pos = ReferenceListProperty(x, y)
    '''Position of the widget.

    :data:`pos` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`x`, :data:`y`) properties.
    '''

    size = ReferenceListProperty(width, height)
    '''Size of the widget.

    :data:`size` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`width`, :data:`height`) properties.
    '''

    def get_right(self):
        return self.x + self.width

    def set_right(self, value):
        self.x = value - self.width

    right = AliasProperty(get_right, set_right, bind=('x', 'width'))
    '''Right position of the widget

    :data:`right` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`x` + :data:`width`)
    '''

    def get_top(self):
        return self.y + self.height

    def set_top(self, value):
        self.y = value - self.height

    top = AliasProperty(get_top, set_top, bind=('y', 'height'))
    '''Top position of the widget

    :data:`top` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`y` + :data:`height`)
    '''

    def get_center_x(self):
        return self.x + self.width / 2.

    def set_center_x(self, value):
        self.x = value - self.width / 2.
    center_x = AliasProperty(get_center_x, set_center_x, bind=('x', 'width'))
    '''X center position of the widget

    :data:`center_x` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`x` + :data:`width` / 2.)
    '''

    def get_center_y(self):
        return self.y + self.height / 2.

    def set_center_y(self, value):
        self.y = value - self.height / 2.
    center_y = AliasProperty(get_center_y, set_center_y, bind=('y', 'height'))
    '''Y center position of the widget

    :data:`center_y` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`y` + :data:`height` / 2.)
    '''

    center = ReferenceListProperty(center_x, center_y)
    '''Center position of the widget

    :data:`center` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`center_x`, :data:`center_y`)
    '''

    cls = ListProperty([])
    '''Class of the widget, used for styling.
    '''

    id = StringProperty(None, allownone=True)
    '''Uniq identifier of the widget in the tree.

    :data:`id` is a :class:`~kivy.properties.StringProperty`, default to None.

    .. warning::

        If the :data:`id` is already used in the tree, an exception will
        occur.
    '''

    children = ListProperty([])
    '''Children list

    :data:`children` is a :class:`~kivy.properties.ListProperty` instance,
    default to an empty list.

    Use :func:`add_widget` and :func:`remove_widget` for manipulate children
    list. Don't manipulate children list directly until you know what you are
    doing.
    '''

    parent = ObjectProperty(None, allownone=True)
    '''Parent of the widget

    :data:`parent` is a :class:`~kivy.properties.ObjectProperty` instance,
    default to None.

    The parent of a widget is set when the widget is added to another one, and
    unset when the widget is removed from his parent.
    '''

    size_hint_x = NumericProperty(1, allownone=True)
    '''X size hint. It represent how much space the widget should use in the X
    axis from his parent. Only :class:`~kivy.uix.layout.Layout` and
    :class:`~kivy.core.window.Window` are using the hint.

    Value is in percent, 1. will mean the full size of his parent, aka 100%. 0.5
    will represent 50%.

    :data:`size_hint_x` is a :class:`~kivy.properties.NumericProperty`, default
    to 1.
    '''

    size_hint_y = NumericProperty(1, allownone=True)
    '''Y size hint.

    :data:`size_hint_y` is a :class:`~kivy.properties.NumericProperty`, default
    to 1.

    See :data:`size_hint_x` for more information
    '''

    size_hint = ReferenceListProperty(size_hint_x, size_hint_y)
    '''Size hint.

    :data:`size_hint` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`size_hint_x`, :data:`size_hint_y`)

    See :data:`size_hint_x` for more information
    '''

    pos_hint = ObjectProperty({})
    '''Position hint. This property permit you to set the position of the widget
    inside his parent layout, in percent.

    For example, if you want to set the top of the widget to be at 90% height of
    his parent layout, you can write:

        widget = Widget(pos_hint={'top': 0.9})

    The keys 'x', 'right' will use the parent width.
    The keys 'y', 'top' will use the parent height.

    Check :doc:`api-kivy.uix.floatlayout` for more informations.

    Position hint is only used in :class:`~kivy.uix.floatlayout.FloatLayout` and
    :class:`~kivy.core.window.Window`.

    :data:`pos_hint` is a :class:`~kivy.properties.ObjectProperty` containing a
    dict.
    '''

    canvas = None
    '''Canvas of the widget.

    The canvas is a graphics object that contain all the drawing instruction.
    Check :class:`~kivy.graphics.Canvas` for more information about usage.
    '''

<commit_msg>widget: don't create canvas is user have created his own.<commit_after>'''
Widget class
============

The :class:`Widget` class is base class required to create a Widget.
Our widget class is designed for:

    Event managed
        The widget interaction is build on top of event. If a property change,
        the widget will do something. If nothing change in the widget, nothing
        will be done. That's the main goal of the
        :class:`~kivy.properties.Property` class.

    Seperate widget and graphical representation
        We don't have a `draw()` method. The idea is to let you the possibility
        to create your own graphical representation outside the widget class.
        And you'll use all the available properties to do that.
        Every widget have his own :class:`~kivy.graphics.Canvas`.

    Bounding box / Collision
        Since the graphical representation is seperated, the position and size
        of the widget represent his bounding box. You can check if a point is
        inside the widget with :func:`Widget.collide_point`, or if a widget is
        colliding another widget with :func:`Widget.collide_widget`.


Usage of properties
-------------------

When you read the documentation, every property are described in the format::

    <name> is a <property class>, default to <default value>

For example::

    :data:`Widget.pos` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`Widget.x`, :data:`Widget.y`) properties.

If you want to know when a the pos attribute change (meaning when the widget
move), you can bind your own function like this::

    def callback_pos(instance, value):
        print 'the widget', instance, 'have moved to', value

    wid = Widget()
    wid.bind(pos=callback_pos)

'''

__all__ = ('Widget', 'WidgetException')

from kivy.event import EventDispatcher
from kivy.properties import NumericProperty, StringProperty, \
        AliasProperty, ReferenceListProperty, Property, ObjectProperty, \
        ListProperty
from kivy.graphics import Canvas
from kivy.base import EventLoop
from kivy.lang import Builder

Widget_forbidden_properties = ('touch_down', 'touch_move', 'touch_up')


class WidgetException(Exception):
    '''Fired when the widget got an exception
    '''
    pass


class Widget(EventDispatcher):
    '''Widget class. See module documentation for more informations.

    :Events:
        `on_touch_down`:
            Fired when a new touch appear
        `on_touch_move`:
            Fired when an existing touch is moved
        `on_touch_down`:
            Fired when an existing touch disapear
    '''

    # UID counter
    __widget_uid = 0

    def __new__(__cls__, *largs, **kwargs):
        self = super(Widget, __cls__).__new__(__cls__)

        # XXX for the moment, we need to create a uniq id for properties.
        # Properties need a identifier to the class instance. hash() and id()
        # are longer than using a custom __uid. I hope we can figure out a way
        # of doing that without require any python code. :)
        Widget.__widget_uid += 1
        self.__dict__['__uid'] = Widget.__widget_uid

        # First loop, link all the properties storage to our instance
        attrs_found = {}
        attrs = dir(__cls__)
        for k in attrs:
            attr = getattr(__cls__, k)
            if isinstance(attr, Property):
                if k in Widget_forbidden_properties:
                    raise Exception(
                        'The property <%s> have a forbidden name' % k)
                attr.link(self, k)
                attrs_found[k] = attr

        # Second loop, resolve all the reference
        for k in attrs:
            attr = getattr(__cls__, k)
            if isinstance(attr, Property):
                attr.link_deps(self, k)

        self.__properties = attrs_found

        # Then, return the class instance
        return self

    def __del__(self):
        # The thing here, since the storage of the property is inside the
        # Property class, we must remove ourself from the storage of each
        # Property. The usage is faster, the creation / deletion is longer.
        for attr in self.__properties.itervalues():
            attr.unlink(self)

    def __init__(self, **kwargs):
        super(Widget, self).__init__()

        # Register touch events
        self.register_event_type('on_touch_down')
        self.register_event_type('on_touch_move')
        self.register_event_type('on_touch_up')

        # Before doing anything, ensure the windows exist.
        EventLoop.ensure_window()

        # Auto bind on own handler if exist
        properties = self.__properties.keys()
        for func in dir(self):
            if not func.startswith('on_'):
                continue
            name = func[3:]
            if name in properties:
                self.bind(**{name: getattr(self, func)})

        # Create the default canvas if not exist
        if self.canvas is None:
            self.canvas = Canvas()

        # Apply the existing arguments to our widget
        for key, value in kwargs.iteritems():
            if hasattr(self, key):
                setattr(self, key, value)

        # Apply all the styles
        if '__no_builder' not in kwargs:
            Builder.apply(self)

    def create_property(self, name):
        '''Create a new property at runtime.

        .. warning::

            This function is designed for the Kivy language, don't use it in
            your code. You should declare the property in your class instead of
            using this method.

        :Parameters:
            `name`: string
                Name of the property

        The class of the property cannot be specified, it will be always an
        :class:`~kivy.properties.ObjectProperty` class. The default value of the
        property will be None, until you set a new value.

        >>> mywidget = Widget()
        >>> mywidget.create_property('custom')
        >>> mywidget.custom = True
        >>> print mywidget.custom
        True
        '''
        prop = ObjectProperty(None)
        prop.link(self, name)
        prop.link_deps(self, name)
        self.__properties[name] = prop
        setattr(self, name, prop)


    #
    # Collision
    #
    def collide_point(self, x, y):
        '''Check if a point (x, y) is inside the widget bounding box.

        :Parameters:
            `x`: numeric
                X position of the point
            `y`: numeric
                Y position of the point

        :Returns:
            bool, True if the point is inside the bounding box

        >>> Widget(pos=(10, 10), size=(50, 50)).collide_point(40, 40)
        True
        '''
        return self.x <= x <= self.right and self.y <= y <= self.top

    def collide_widget(self, wid):
        '''Check if widget (bounding box) is colliding with our widget bounding
        box.

        :Parameters:
            `wid`: :class:`Widget` class
                Widget to collide to.

        :Returns:
            bool, True if the widget is colliding us.

        >>> wid = Widget(size=(50, 50))
        >>> wid2 = Widget(size=(50, 50), pos=(25, 25))
        >>> wid.collide_widget(wid2)
        True
        >>> wid2.pos = (55, 55)
        >>> wid.collide_widget(wid2)
        False
        '''
        if self.right < wid.x:
            return False
        if self.x > wid.right:
            return False
        if self.top < wid.y:
            return False
        if self.y > wid.top:
            return False
        return True


    #
    # Default event handlers
    #
    def on_touch_down(self, touch):
        '''Receive a touch down event

        :Parameters:
            `touch`: :class:`~kivy.input.motionevent.MotionEvent` class
                Touch received

        :Returns:
            bool. If True, the dispatching will stop.
        '''
        for child in self.children[:]:
            if child.dispatch('on_touch_down', touch):
                return True

    def on_touch_move(self, touch):
        '''Receive a touch move event.

        See :func:`on_touch_down` for more information
        '''
        for child in self.children[:]:
            if child.dispatch('on_touch_move', touch):
                return True

    def on_touch_up(self, touch):
        '''Receive a touch up event.

        See :func:`on_touch_down` for more information
        '''
        for child in self.children[:]:
            if child.dispatch('on_touch_up', touch):
                return True


    #
    # Events
    #
    def bind(self, **kwargs):
        '''Bind properties or event to handler.

        Example of usage::

            def my_x_callback(obj, value):
                print 'on object', obj', 'x changed to', value
            def my_width_callback(obj, value):
                print 'on object', obj, 'width changed to', value
            self.bind(x=my_x_callback, width=my_width_callback)
        '''
        super(Widget, self).bind(**kwargs)
        for key, value in kwargs.iteritems():
            if key.startswith('on_'):
                continue
            self.__properties[key].bind(self, value)

    def unbind(self, **kwargs):
        '''Unbind properties or event from handler

        See :func:`bind()` for more information.
        '''
        super(Widget, self).unbind(**kwargs)
        for key, value in kwargs.iteritems():
            if key.startswith('on_'):
                continue
            self.__properties[key].unbind(self, value)


    #
    # Tree management
    #
    def add_widget(self, widget):
        '''Add a new widget as a child of current widget

        :Parameters:
            `widget`: :class:`Widget`
                Widget to add in our children list.

        >>> root = Widget()
        >>> root.add_widget(Button())
        >>> slider = Slider()
        >>> root.add_widget(slider)
        '''
        if not isinstance(widget, Widget):
            raise WidgetException(
                'add_widget() can be used only with Widget classes.')
        widget.parent = self
        self.children = [widget] + self.children
        self.canvas.add(widget.canvas)

    def remove_widget(self, widget):
        '''Remove a widget from the children of current widget

        :Parameters:
            `widget`: :class:`Widget`
                Widget to add in our children list.

        >>> root = Widget()
        >>> button = Button()
        >>> root.add_widget(button)
        >>> root.remove_widget(button)
        '''
        if widget not in self.children:
            return
        self.children.remove(widget)
        self.children = self.children[:]
        self.canvas.remove(widget.canvas)
        widget.parent = None

    def clear_widgets(self):
        '''Remove all widgets added to the widget.
        '''
        remove_widget = self.remove_widget
        for child in self.children[:]:
            remove_widget(child)

    def get_root_window(self):
        '''Return the root window

        :Returns:
            Instance of the root window. Can be
            :class:`~kivy.core.window.WindowBase` or
            :class:`Widget`
        '''
        if self.parent:
            return self.parent.get_root_window()

    def get_parent_window(self):
        '''Return the parent window

        :Returns:
            Instance of the root window. Can be
            :class:`~kivy.core.window.WindowBase` or
            :class:`Widget`
        '''
        if self.parent:
            return self.parent.get_parent_window()

    def to_widget(self, x, y, relative=False):
        '''Return the coordinate from window to local widget'''
        if self.parent:
            x, y = self.parent.to_widget(x, y)
        return self.to_local(x, y, relative=relative)

    def to_window(self, x, y, initial=True, relative=False):
        '''Transform local coordinate to window coordinate'''
        if not initial:
            x, y = self.to_parent(x, y, relative=relative)
        if self.parent:
            return self.parent.to_window(x, y, initial=False, relative=relative)
        return (x, y)

    def to_parent(self, x, y, relative=False):
        '''Transform local coordinate to parent coordinate

        :Parameters:
            `relative`: bool, default to False
                Change to True is you want to translate relative position from
                widget to his parent.
        '''
        if relative:
            return (x + self.x, y + self.y)
        return (x, y)

    def to_local(self, x, y, relative=False):
        '''Transform parent coordinate to local coordinate

        :Parameters:
            `relative`: bool, default to False
                Change to True is you want to translate a coordinate to a
                relative coordinate from widget.
        '''
        if relative:
            return (x - self.x, y - self.y)
        return (x, y)


    #
    # Properties
    #
    def setter(self, name):
        '''Return the setter of a property. Useful if you want to directly bind
        a property to another.

        For example, if you want to position one widget next to you ::

            self.bind(right=nextchild.setter('x'))
        '''
        return self.__properties[name].__set__

    def getter(self, name):
        '''Return the getter of a property.
        '''
        return self.__properties[name].__get__

    x = NumericProperty(0)
    '''X position of the widget.

    :data:`x` is a :class:`~kivy.properties.NumericProperty`, default to 0.
    '''

    y = NumericProperty(0)
    '''Y position of the widget.

    :data:`y` is a :class:`~kivy.properties.NumericProperty`, default to 0.
    '''

    width = NumericProperty(100)
    '''Width of the widget.

    :data:`width` is a :class:`~kivy.properties.NumericProperty`, default
    to 100.
    '''

    height = NumericProperty(100)
    '''Height of the widget.

    :data:`height` is a :class:`~kivy.properties.NumericProperty`, default
    to 100.
    '''

    pos = ReferenceListProperty(x, y)
    '''Position of the widget.

    :data:`pos` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`x`, :data:`y`) properties.
    '''

    size = ReferenceListProperty(width, height)
    '''Size of the widget.

    :data:`size` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`width`, :data:`height`) properties.
    '''

    def get_right(self):
        return self.x + self.width

    def set_right(self, value):
        self.x = value - self.width

    right = AliasProperty(get_right, set_right, bind=('x', 'width'))
    '''Right position of the widget

    :data:`right` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`x` + :data:`width`)
    '''

    def get_top(self):
        return self.y + self.height

    def set_top(self, value):
        self.y = value - self.height

    top = AliasProperty(get_top, set_top, bind=('y', 'height'))
    '''Top position of the widget

    :data:`top` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`y` + :data:`height`)
    '''

    def get_center_x(self):
        return self.x + self.width / 2.

    def set_center_x(self, value):
        self.x = value - self.width / 2.
    center_x = AliasProperty(get_center_x, set_center_x, bind=('x', 'width'))
    '''X center position of the widget

    :data:`center_x` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`x` + :data:`width` / 2.)
    '''

    def get_center_y(self):
        return self.y + self.height / 2.

    def set_center_y(self, value):
        self.y = value - self.height / 2.
    center_y = AliasProperty(get_center_y, set_center_y, bind=('y', 'height'))
    '''Y center position of the widget

    :data:`center_y` is a :class:`~kivy.properties.AliasProperty` of
    (:data:`y` + :data:`height` / 2.)
    '''

    center = ReferenceListProperty(center_x, center_y)
    '''Center position of the widget

    :data:`center` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`center_x`, :data:`center_y`)
    '''

    cls = ListProperty([])
    '''Class of the widget, used for styling.
    '''

    id = StringProperty(None, allownone=True)
    '''Uniq identifier of the widget in the tree.

    :data:`id` is a :class:`~kivy.properties.StringProperty`, default to None.

    .. warning::

        If the :data:`id` is already used in the tree, an exception will
        occur.
    '''

    children = ListProperty([])
    '''Children list

    :data:`children` is a :class:`~kivy.properties.ListProperty` instance,
    default to an empty list.

    Use :func:`add_widget` and :func:`remove_widget` for manipulate children
    list. Don't manipulate children list directly until you know what you are
    doing.
    '''

    parent = ObjectProperty(None, allownone=True)
    '''Parent of the widget

    :data:`parent` is a :class:`~kivy.properties.ObjectProperty` instance,
    default to None.

    The parent of a widget is set when the widget is added to another one, and
    unset when the widget is removed from his parent.
    '''

    size_hint_x = NumericProperty(1, allownone=True)
    '''X size hint. It represent how much space the widget should use in the X
    axis from his parent. Only :class:`~kivy.uix.layout.Layout` and
    :class:`~kivy.core.window.Window` are using the hint.

    Value is in percent, 1. will mean the full size of his parent, aka 100%. 0.5
    will represent 50%.

    :data:`size_hint_x` is a :class:`~kivy.properties.NumericProperty`, default
    to 1.
    '''

    size_hint_y = NumericProperty(1, allownone=True)
    '''Y size hint.

    :data:`size_hint_y` is a :class:`~kivy.properties.NumericProperty`, default
    to 1.

    See :data:`size_hint_x` for more information
    '''

    size_hint = ReferenceListProperty(size_hint_x, size_hint_y)
    '''Size hint.

    :data:`size_hint` is a :class:`~kivy.properties.ReferenceListProperty` of
    (:data:`size_hint_x`, :data:`size_hint_y`)

    See :data:`size_hint_x` for more information
    '''

    pos_hint = ObjectProperty({})
    '''Position hint. This property permit you to set the position of the widget
    inside his parent layout, in percent.

    For example, if you want to set the top of the widget to be at 90% height of
    his parent layout, you can write:

        widget = Widget(pos_hint={'top': 0.9})

    The keys 'x', 'right' will use the parent width.
    The keys 'y', 'top' will use the parent height.

    Check :doc:`api-kivy.uix.floatlayout` for more informations.

    Position hint is only used in :class:`~kivy.uix.floatlayout.FloatLayout` and
    :class:`~kivy.core.window.Window`.

    :data:`pos_hint` is a :class:`~kivy.properties.ObjectProperty` containing a
    dict.
    '''

    canvas = None
    '''Canvas of the widget.

    The canvas is a graphics object that contain all the drawing instruction.
    Check :class:`~kivy.graphics.Canvas` for more information about usage.
    '''


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