[mutter/wip/carlosg/grabs-pt1: 79/86] clutter: Propagate events only inside the grab

[Carlos Garnacho <carlosg src gnome org>]

commit 8bcab17f6ceb08338e20a23674dc36d10d807c8d
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 d7e4b5ac1b..6816e91870 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -3848,3 +3848,15 @@ 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__ */