add inactive-alpha IPC script

ipc-scripts/inactive-alpha.py

@@ -0,0 +1,27 @@
+#!/usr/bin/python3
+#
+# This script demonstrates how Wayfire's IPC can be used to set the opacity of inactive views.
+
+import os
+from wayfire_socket import *
+
+addr = os.getenv('WAYFIRE_SOCKET')
+sock = WayfireSocket(addr)
+sock.watch()
+
+last_focused_toplevel = -1
+while True:
+    msg = sock.read_message()
+    # The view-mapped event is emitted when a new window has been opened.
+    if "event" in msg and msg["event"] == "view-focused":
+        view = msg["view"]
+        print(view)
+        new_focus = view["id"] if view and view["type"] == "toplevel" else -1
+        if last_focused_toplevel != new_focus:
+            if last_focused_toplevel != -1 and new_focus != -1:
+                sock.set_view_alpha(last_focused_toplevel, 0.8)
+
+            if new_focus != -1:
+                sock.set_view_alpha(new_focus, 1.0)
+
+            last_focused_toplevel = new_focus