Here's my code and I simply cannot figure out why my top level window doesn't become transparent.
xwininfo says that windows has 32 Bit depth. I am running Ubuntu 11.10 and if I call .set_opacity(.5) on the window itself, it will become transparent. But all the content of the window too. I'd like a transparent background, but widgets should stay opaque.
I looked at the notify-osd code and they are calling set_opacity on the main window. Yet, I cannot figure out why other widgets on the osd stay opaque. Here's the code:
#!/usr/bin/env python
from gi.repository import Gtk, Gdk
class MyWin (Gtk.Window):
def __init__(self):
super(MyWin, self).__init__()
self.set_position(Gtk.WindowPosition.CENTER)
self.set_border_width(30)
self.screen = self.get_screen()
self.visual = self.screen.get_rgba_visual()
if self.visual != None and self.screen.is_composited():
print "yay"
self.set_visual(self.visual)
box = Gtk.Box()
btn1 = Gtk.Button(label="foo")
box.add(btn1)
self.add(box)
self.set_app_paintable(True)
self.connect("draw", self.area_draw)
self.show_all()
def area_draw(self, widget, cr):
cr.set_source_rgba(0, 0, 0, .3)
cr.paint()
# def screen_changed(self, widget, cr):
# self.screen = widget.get_screen()
# self.visual = self.screen.get_rgba_visual()
# if self.visual != None and self.screen.is_composited():
# self.set_visual(self.visual)
MyWin()
Gtk.main()
Best Answer
I solved the problem, here's the code that works. The important part is setting the correct operator for operation that is being performed on the surface.