[clutter] stage: Allow tracking dragged actors

[Emmanuele Bassi <ebassi src gnome org>]

commit 530a13f02f710710607732ed21b1493f04931615
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Fri Jun 17 16:51:05 2011 +0100

    stage: Allow tracking dragged actors
    
    We should be able to internally attach the actor currently being dragged
    to the device that is dragging it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=652842

 clutter/clutter-stage-private.h |    8 ++++++
 clutter/clutter-stage.c         |   48 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-stage-private.h b/clutter/clutter-stage-private.h
index 07ac99d..9911f38 100644
--- a/clutter/clutter-stage-private.h
+++ b/clutter/clutter-stage-private.h
@@ -99,6 +99,14 @@ void            _clutter_stage_release_pick_id          (ClutterStage *stage,
 ClutterActor *  _clutter_stage_get_actor_by_pick_id     (ClutterStage *stage,
                                                          gint32        pick_id);
 
+void            _clutter_stage_add_drag_actor           (ClutterStage       *stage,
+                                                         ClutterInputDevice *device,
+                                                         ClutterActor       *actor);
+ClutterActor *  _clutter_stage_get_drag_actor           (ClutterStage       *stage,
+                                                         ClutterInputDevice *device);
+void            _clutter_stage_remove_drag_actor        (ClutterStage       *stage,
+                                                         ClutterInputDevice *device);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_STAGE_PRIVATE_H__ */
diff --git a/clutter/clutter-stage.c b/clutter/clutter-stage.c
index 10190a9..e045406 100644
--- a/clutter/clutter-stage.c
+++ b/clutter/clutter-stage.c
@@ -4091,3 +4091,51 @@ _clutter_stage_get_actor_by_pick_id (ClutterStage *stage,
 
   return _clutter_id_pool_lookup (priv->pick_id_pool, pick_id);
 }
+
+void
+_clutter_stage_add_drag_actor (ClutterStage       *stage,
+                               ClutterInputDevice *device,
+                               ClutterActor       *actor)
+{
+  GHashTable *drag_actors;
+
+  drag_actors = g_object_get_data (G_OBJECT (stage), "__clutter_stage_drag_actors");
+  if (drag_actors == NULL)
+    {
+      drag_actors = g_hash_table_new (NULL, NULL);
+      g_object_set_data_full (G_OBJECT (stage), "__clutter_stage_drag_actors",
+                              drag_actors,
+                              (GDestroyNotify) g_hash_table_destroy);
+    }
+
+  g_hash_table_replace (drag_actors, device, actor);
+}
+
+ClutterActor *
+_clutter_stage_get_drag_actor (ClutterStage       *stage,
+                               ClutterInputDevice *device)
+{
+  GHashTable *drag_actors;
+
+  drag_actors = g_object_get_data (G_OBJECT (stage), "__clutter_stage_drag_actors");
+  if (drag_actors == NULL)
+    return NULL;
+
+  return g_hash_table_lookup (drag_actors, device);
+}
+
+void
+_clutter_stage_remove_drag_actor (ClutterStage       *stage,
+                                  ClutterInputDevice *device)
+{
+  GHashTable *drag_actors;
+
+  drag_actors = g_object_get_data (G_OBJECT (stage), "__clutter_stage_drag_actors");
+  if (drag_actors == NULL)
+    return;
+
+  g_hash_table_remove (drag_actors, device);
+
+  if (g_hash_table_size (drag_actors) == 0)
+    g_object_set_data (G_OBJECT (stage), "__clutter_stage_drag_actors", NULL);
+}