From 24344d81412715eb6088489698b6fd7e78b28c88 Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Tue, 5 Sep 2023 13:08:14 +0200
Subject: [PATCH] core: Add ::focus-window signal

This will be triggered whenever the input focus changes, so that
other pieces may hook to this place.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3269>
---
 src/core/display.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/core/display.c b/src/core/display.c
index 71daeea14..b30414d19 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -347,6 +347,14 @@ meta_display_class_init (MetaDisplayClass *klass)
                   g_signal_accumulator_first_wins, NULL, NULL,
                   G_TYPE_BOOLEAN, 0);
 
+  display_signals[FOCUS_WINDOW] =
+    g_signal_new ("focus-window",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 2, META_TYPE_WINDOW, G_TYPE_INT64);
+
   display_signals[WINDOW_CREATED] =
     g_signal_new ("window-created",
                   G_TYPE_FROM_CLASS (klass),
@@ -1618,6 +1626,8 @@ meta_display_set_input_focus (MetaDisplay *display,
   if (meta_display_timestamp_too_old (display, &timestamp))
     return;
 
+  g_signal_emit (display, display_signals[FOCUS_WINDOW], 0, window, ms2us (timestamp));
+
 #ifdef HAVE_X11_CLIENT
   if (display->x11_display)
     {