I tried the following example and it worked fine with gnome. But I didn’t worked successfully with xfce.
What should I check to make sure it would work in xfce.
Like X11, or xfwm version?
#!/usr/bin/env python3
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk
import cairo
supports_alpha = False
def screen_changed(widget, old_screen, userdata=None):
global supports_alpha
screen = widget.get_screen()
visual = screen.get_rgba_visual()
if visual is None:
print("Your screen does not support alpha channels!")
visual = screen.get_system_visual()
supports_alpha = False
else:
print("Your screen supports alpha channels!")
supports_alpha = True
widget.set_visual(visual)
def expose_draw(widget, event, userdata=None):
global supports_alpha
cr = Gdk.cairo_create(widget.get_window())
if supports_alpha:
print("setting transparent window")
cr.set_source_rgba(1.0, 1.0, 1.0, 0.0)
else:
print("setting opaque window")
cr.set_source_rgb(1.0, 1.0, 1.0)
cr.set_operator(cairo.OPERATOR_SOURCE)
cr.paint()
return False
def clicked(window, event, userdata=None):
# toggle window manager frames
window.set_decorated(not window.get_decorated())
if __name__ == "__main__":
window = Gtk.Window()
window.set_position(Gtk.WindowPosition.CENTER)
window.set_default_size(400, 400)
window.set_title("Alpha Demo")
window.connect("delete-event", Gtk.main_quit)
window.set_app_paintable(True)
window.connect("draw", expose_draw)
window.connect("screen-changed", screen_changed)
window.set_decorated(False)
window.add_events(Gdk.EventMask.BUTTON_PRESS_MASK)
window.connect("button-press-event", clicked)
fixed_container = Gtk.Fixed()
window.add(fixed_container)
button = Gtk.Button.new_with_label("button1")
button.set_size_request(100, 100)
fixed_container.add(button)
screen_changed(window, None, None)
window.show_all()
Gtk.main()