Init

transparent.py

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+import math
+import sys
+
+import gi
+
+gi.require_version("Gtk", "3.0")
+from gi.repository import Gtk  # noqa
+import cairo  # noqa
+
+
+class TestWin(Gtk.Window):
+    WINDOW_POPUP = 1
+
+    def __init__(self):
+        Gtk.Window.__init__(self, type=self.WINDOW_POPUP)
+
+        self._default_monitor = 0
+        self.make_fullscreen()
+        self.label = Gtk.Label(label="Hallo! :)")
+        self.label.show()
+        self.add(self.label)
+
+        self.make_rgba()
+        self.set_app_paintable(True)
+        self.connect("draw", self.on_draw)
+
+        self.show()
+        self.make_untouchable()
+
+    def make_rgba(self):
+        self.screen = self.get_screen()
+        self.visual = self.screen.get_rgba_visual()
+        if self.visual is None or not self.screen.is_composited():
+            print("ERROR: You do not appear to be running a composite manager")
+            sys.exit(1)
+        else:
+            self.set_visual(self.visual)
+
+    def make_fullscreen(self):
+        geo = self.get_screen_size(self._default_monitor)
+        self.move(geo.x, geo.y)
+        self.resize(geo.width, geo.height)
+ 
+    def get_screen_size(self, monitor):
+        return self.get_screen().get_monitor_geometry(monitor)
+
+    def on_draw(self, widget, cr):
+        # make everything transparent
+        cr.set_source_rgba(1.0, 1.0, 1.0, 0.1)
+        cr.set_operator(cairo.OPERATOR_SOURCE)
+        cr.paint()
+        cr.set_operator(cairo.OPERATOR_OVER)
+
+        # draw the circle
+        w, h = self.get_size()
+        cr.translate(w / 2, h / 2)
+        cr.set_source_rgba(0.7, 0.3, 0.0, 0.6)
+        cr.arc(0, 0, 10, 0, 2 * math.pi)
+        cr.stroke_preserve()
+        cr.fill()
+
+    def make_untouchable(self):
+        self.input_shape_combine_region(cairo.Region(cairo.RectangleInt(0, 0, 0, 0)))
+
+    def run(self):
+        Gtk.main()
+        return 0
+
+
+if __name__ == "__main__":
+    app = TestWin()
+    sys.exit(app.run())