Desktop player on mpv: floating window, system integration

tools/linux/fake_screensaver.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""A stand-in org.freedesktop.ScreenSaver for the test stand's D-Bus (tools/linux/stand.sh): prints every Inhibit and
+UnInhibit, so the app's screensaver inhibition (L9) can be checked without the user's desktop.
+
+  stand.sh bus python3 tools/linux/fake_screensaver.py > log &
+"""
+from gi.repository import Gio, GLib
+
+XML = """<node><interface name="org.freedesktop.ScreenSaver">
+<method name="Inhibit"><arg type="s" direction="in"/><arg type="s" direction="in"/><arg type="u" direction="out"/></method>
+<method name="UnInhibit"><arg type="u" direction="in"/></method>
+</interface></node>"""
+cookies = iter(range(1, 1 << 31))
+
+
+def call(conn, sender, path, iface, method, args, invocation):
+    if method == "Inhibit":
+        cookie = next(cookies)
+        print(f"Inhibit {args.unpack()} from {sender} -> {cookie}", flush=True)
+        invocation.return_value(GLib.Variant("(u)", (cookie,)))
+    else:
+        print(f"UnInhibit {args.unpack()[0]} from {sender}", flush=True)
+        invocation.return_value(None)
+
+
+def acquired(conn, name):
+    conn.register_object("/org/freedesktop/ScreenSaver", Gio.DBusNodeInfo.new_for_xml(XML).interfaces[0], call, None, None)
+    # The real service drops an inhibition when its owner leaves the bus; show that moment.
+    conn.signal_subscribe("org.freedesktop.DBus", "org.freedesktop.DBus", "NameOwnerChanged", None, None, 0,
+                          lambda c, s, p, i, sig, a: a.unpack()[2] == "" and a.unpack()[0].startswith(":") and print(f"gone {a.unpack()[0]}", flush=True))
+    print("ready", flush=True)
+
+
+Gio.bus_own_name(Gio.BusType.SESSION, "org.freedesktop.ScreenSaver", 0, acquired, None, None)
+GLib.MainLoop().run()