#!/usr/bin/python
import gtk
import gobject


class MyApp():

    def __init__(self):
        window = gtk.Window()
        window.set_decorated(False)
        window.set_opacity(0)

        drawing_area = gtk.DrawingArea()
        drawing_area.set_size_request(512, 512)

        #self.pixbuf = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, True, 8, 300, 300)

        window.connect('destroy', self.destroy)
        drawing_area.connect('configure_event', self.__configure_cb)
        drawing_area.connect('expose-event', self.__expose_cb)

        window.add(drawing_area)
        
        window.set_position(gtk.WIN_POS_CENTER_ALWAYS)
        window.show()
        drawing_area.show()

    def destroy(self, window, data=None):
        gtk.main_quit()

    def __configure_cb(self, drawing_area, data=None):
        x, y, width, height = drawing_area.get_allocation()
        
        drawing_area.window.set_opacity(0)
        canvas = drawing_area.window

        #self.pixmap = gtk.gdk.Pixmap(canvas, width, height, depth=-1)

        #self.pixmap.draw_pixbuf(None, self.pixbuf, 0, 0, 0, 0, -1, -1,
        #                        gtk.gdk.RGB_DITHER_NONE, 0, 0)
        return True

    def __expose_cb(self, drawing_area, data=None):
        x, y, width, height = data.area
        #context = drawing_area.get_style().fg_gc[gtk.STATE_NORMAL]
        context = drawing_area.window.new_gc(foreground=None, background=None)

        canvas = drawing_area.window
        
        
        canvas.draw_drawable(context, self.pixmap, x, y, x, y, width, height)

        return False

if __name__ == "__main__":
    my_app = MyApp()
    gtk.main()