[mutter/wip/carlosg/grabs-pt1: 37/42] clutter: Notify grab changes on the key focus

[Carlos Garnacho <carlosg src gnome org>]

commit 49de1eb85dd4f2d383f50bd3e17779fff9a13707
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Oct 27 18:00:25 2021 +0200

    clutter: Notify grab changes on the key focus
    
    Dissociate clutter_stage_set_key_focus() from the actors focused
    state, so that it obeys stage grabs. The key focus actor state may
    also change due to grab changes, add the code to notify about this.

 clutter/clutter/clutter-stage.c | 49 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 5 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index 14d37f20da..bcb112c0f0 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -2034,13 +2034,23 @@ clutter_stage_set_key_focus (ClutterStage *stage,
    * intended. The order of events would be:
    *   1st focus-out, 2nd focus-out (on stage), 2nd focus-in, 1st focus-in
    */
-  if (actor != NULL)
+  priv->key_focused_actor = actor;
+
+  /* If the key focused actor is allowed to receive key events according
+   * to the given grab (or there is none) set key focus on it, otherwise
+   * key focus is delayed until there are grabbing conditions that allow
+   * it to get key focus.
+   */
+  if (!priv->grabs ||
+      priv->grabs->actor == CLUTTER_ACTOR (stage) ||
+      priv->grabs->actor == actor ||
+      (actor && clutter_actor_contains (priv->grabs->actor, actor)))
     {
-      priv->key_focused_actor = actor;
-      _clutter_actor_set_has_key_focus (actor, TRUE);
+      if (actor != NULL)
+        _clutter_actor_set_has_key_focus (actor, TRUE);
+      else
+        _clutter_actor_set_has_key_focus (CLUTTER_ACTOR (stage), TRUE);
     }
-  else
-    _clutter_actor_set_has_key_focus (CLUTTER_ACTOR (stage), TRUE);
 
   g_object_notify_by_pspec (G_OBJECT (stage), obj_props[PROP_KEY_FOCUS]);
 }
@@ -3654,6 +3664,33 @@ clutter_stage_notify_grab_on_entry (ClutterStage       *stage,
     }
 }
 
+static void
+clutter_stage_notify_grab_on_key_focus (ClutterStage *stage,
+                                        ClutterActor *grab_actor,
+                                        ClutterActor *old_grab_actor)
+{
+  ClutterStagePrivate *priv = stage->priv;
+  ClutterActor *key_focus;
+  gboolean focus_in_grab, focus_in_old_grab;
+
+  key_focus = priv->key_focused_actor ?
+    priv->key_focused_actor : CLUTTER_ACTOR (stage);
+
+  focus_in_grab =
+    !grab_actor ||
+    grab_actor == key_focus ||
+    clutter_actor_contains (grab_actor, key_focus);
+  focus_in_old_grab =
+    !old_grab_actor ||
+    old_grab_actor == key_focus ||
+    clutter_actor_contains (old_grab_actor, key_focus);
+
+  if (focus_in_grab && !focus_in_old_grab)
+    _clutter_actor_set_has_key_focus (CLUTTER_ACTOR (stage), TRUE);
+  else if (!focus_in_grab && focus_in_old_grab)
+    _clutter_actor_set_has_key_focus (CLUTTER_ACTOR (stage), FALSE);
+}
+
 static void
 clutter_stage_notify_grab (ClutterStage *stage,
                            ClutterGrab  *cur,
@@ -3692,6 +3729,8 @@ clutter_stage_notify_grab (ClutterStage *stage,
                                           cur_actor,
                                           old_actor);
     }
+
+  clutter_stage_notify_grab_on_key_focus (stage, cur_actor, old_actor);
 }
 
 ClutterGrab *