#--------------------------------------------------------------------
#
#   PyGUI - DrawableContainer - Generic
#
#--------------------------------------------------------------------

from GUI.Geometry import rect_sized
from GUI import Container
from GUI import ViewBase
from GUI.Printing import Printable

default_size = (100, 100)

class DrawableContainer(ViewBase, Container, Printable):

    #
    #		Construction and destruction
    #

    def __init__(self, **kwds):
        Container.__init__(self, **kwds)
        ViewBase.__init__(self)
    
    def destroy(self):
        ViewBase.destroy(self)
        Container.destroy(self)
        
    def setup_menus(self, m):
        ViewBase.setup_menus(self, m)
        Container.setup_menus(self, m)

    def viewed_rect(self):
        """Return the rectangle in local coordinates bounding the currently
        visible part of the extent."""
        return rect_sized((0, 0), self.size)
    
    def with_canvas(self, proc):
        """Call the procedure with a canvas suitable for drawing in this
        view. The canvas is only valid for the duration of the call, and
        should not be retained beyond it."""
        raise NotImplementedError
    
    def update(self):
        """Redraw invalidated regions immediately, without waiting for a
        return to the event loop."""
        raise NotImplementedError

    def get_print_extent(self):
        return self.content_size

    def _draw_background(self, canvas, clip_rect):
        return clip_rect

    #
    #		Callbacks
    #

    def draw(self, canvas, rect):
        """Called when the view needs to be drawn. The rect is the bounding
        rectangle of the region needing to be drawn. The default implementation
        does nothing."""
        pass