[mutter/wip/carlosg/grabs-pt1: 2/9] clutter: Propagate events only inside the grab

[Carlos Garnacho <carlosg src gnome org>]

commit e2b761848f5b1c23f19fc2ab24ff15a8ca0af21a
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Oct 27 00:13:35 2021 +0200

    clutter: Propagate events only inside the grab
    
    The grab actor becomes the "root" of the events being handled, events
    inside propagate normally, but become silenced when falling outside
    the grab area.

 clutter/clutter/clutter-main.c  |  4 +++-
 clutter/clutter/clutter-stage.c | 12 ++++++++++++
 clutter/clutter/clutter-stage.h |  3 +++
 3 files changed, 18 insertions(+), 1 deletion(-)
---
diff --git a/clutter/clutter/clutter-main.c b/clutter/clutter/clutter-main.c
index 132576e67c..f80fbae9be 100644
--- a/clutter/clutter/clutter-main.c
+++ b/clutter/clutter/clutter-main.c
@@ -683,7 +683,9 @@ emit_event_chain (ClutterEvent *event)
       return;
     }
 
-  _clutter_actor_handle_event (event->any.source, NULL, event);
+  _clutter_actor_handle_event (event->any.source,
+                               clutter_stage_get_grab_actor (event->any.stage),
+                               event);
 }
 
 /*
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index ab8dcc1ec4..d67267e053 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -3846,3 +3846,15 @@ clutter_grab_dismiss (ClutterGrab *grab)
 
   g_free (grab);
 }
+
+ClutterActor *
+clutter_stage_get_grab_actor (ClutterStage *stage)
+{
+  ClutterStagePrivate *priv = stage->priv;
+
+  if (!priv->topmost_grab)
+    return NULL;
+
+  /* Return active grab */
+  return priv->topmost_grab->actor;
+}
diff --git a/clutter/clutter/clutter-stage.h b/clutter/clutter/clutter-stage.h
index b45c50ccd7..fc90f69104 100644
--- a/clutter/clutter/clutter-stage.h
+++ b/clutter/clutter/clutter-stage.h
@@ -274,6 +274,9 @@ CLUTTER_EXPORT
 ClutterGrab * clutter_stage_grab (ClutterStage *stage,
                                   ClutterActor *actor);
 
+CLUTTER_EXPORT
+ClutterActor * clutter_stage_get_grab_actor (ClutterStage *stage);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_STAGE_H__ */