[mutter] clutter/main: Remove global/context grabs

[Carlos Garnacho <carlosg src gnome org>]

commit 959eb9809019f7e98c90fbdec4f24b9ce8d61e02
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Sun Apr 14 18:30:31 2019 +0200

    clutter/main: Remove global/context grabs
    
    Those are deprecated in favour of per device grabs.
    
    Also switch to ClutterInputDevice grabs for the grab test.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/536

 clutter/clutter/clutter-main.c        | 238 ++--------------------------------
 clutter/clutter/clutter-main.h        |  13 --
 clutter/clutter/clutter-private.h     |   4 -
 clutter/tests/interactive/test-grab.c |  28 ++--
 4 files changed, 28 insertions(+), 255 deletions(-)
---
diff --git a/clutter/clutter/clutter-main.c b/clutter/clutter/clutter-main.c
index 0fad6c642..5de7602dd 100644
--- a/clutter/clutter/clutter-main.c
+++ b/clutter/clutter/clutter-main.c
@@ -1701,37 +1701,19 @@ static inline void
 emit_pointer_event (ClutterEvent       *event,
                     ClutterInputDevice *device)
 {
-  ClutterMainContext *context = _clutter_context_get_default ();
-
   if (_clutter_event_process_filters (event))
     return;
 
-  if (context->pointer_grab_actor == NULL &&
-      (device == NULL || device->pointer_grab_actor == NULL))
-    {
-      /* no grab, time to capture and bubble */
-      emit_event_chain (event);
-    }
+  if (device != NULL && device->pointer_grab_actor != NULL)
+    clutter_actor_event (device->pointer_grab_actor, event, FALSE);
   else
-    {
-      if (context->pointer_grab_actor != NULL)
-        {
-          /* global grab */
-          clutter_actor_event (context->pointer_grab_actor, event, FALSE);
-        }
-      else if (device != NULL && device->pointer_grab_actor != NULL)
-        {
-          /* per device grab */
-          clutter_actor_event (device->pointer_grab_actor, event, FALSE);
-        }
-    }
+    emit_event_chain (event);
 }
 
 static inline void
 emit_crossing_event (ClutterEvent       *event,
                      ClutterInputDevice *device)
 {
-  ClutterMainContext *context = _clutter_context_get_default ();
   ClutterEventSequence *sequence = clutter_event_get_event_sequence (event);
   ClutterActor *grab_actor = NULL;
 
@@ -1745,9 +1727,7 @@ emit_crossing_event (ClutterEvent       *event,
     }
   else
     {
-      if (context->pointer_grab_actor != NULL)
-        grab_actor = context->pointer_grab_actor;
-      else if (device != NULL && device->pointer_grab_actor != NULL)
+      if (device != NULL && device->pointer_grab_actor != NULL)
         grab_actor = device->pointer_grab_actor;
     }
 
@@ -1788,30 +1768,13 @@ static inline void
 emit_keyboard_event (ClutterEvent       *event,
                      ClutterInputDevice *device)
 {
-  ClutterMainContext *context = _clutter_context_get_default ();
-
   if (_clutter_event_process_filters (event))
     return;
 
-  if (context->keyboard_grab_actor == NULL &&
-      (device == NULL || device->keyboard_grab_actor == NULL))
-    {
-      /* no grab, time to capture and bubble */
-      emit_event_chain (event);
-    }
+  if (device != NULL && device->keyboard_grab_actor != NULL)
+    clutter_actor_event (device->keyboard_grab_actor, event, FALSE);
   else
-    {
-      if (context->keyboard_grab_actor != NULL)
-        {
-          /* global key grab */
-          clutter_actor_event (context->keyboard_grab_actor, event, FALSE);
-        }
-      else if (device != NULL && device->keyboard_grab_actor != NULL)
-        {
-          /* per-device key grab */
-          clutter_actor_event (context->keyboard_grab_actor, event, FALSE);
-        }
-    }
+    emit_event_chain (event);
 }
 
 static inline void
@@ -2009,15 +1972,7 @@ _clutter_process_event_details (ClutterActor        *stage,
             if (_clutter_event_process_filters (event))
               break;
 
-            /* global grabs */
-            if (context->pointer_grab_actor != NULL)
-              {
-                clutter_actor_event (context->pointer_grab_actor,
-                                     event,
-                                     FALSE);
-                break;
-              }
-            else if (device != NULL && device->pointer_grab_actor != NULL)
+            if (device != NULL && device->pointer_grab_actor != NULL)
               {
                 clutter_actor_event (device->pointer_grab_actor,
                                      event,
@@ -2384,19 +2339,6 @@ static void
 on_grab_actor_destroy (ClutterActor       *actor,
                        ClutterInputDevice *device)
 {
-  if (device == NULL)
-    {
-      ClutterMainContext *context = _clutter_context_get_default ();
-
-      if (context->pointer_grab_actor == actor)
-        clutter_ungrab_pointer ();
-
-      if (context->keyboard_grab_actor == actor)
-        clutter_ungrab_keyboard ();
-
-      return;
-    }
-
   switch (device->device_type)
     {
     case CLUTTER_POINTER_DEVICE:
@@ -2412,58 +2354,6 @@ on_grab_actor_destroy (ClutterActor       *actor,
     }
 }
 
-/**
- * clutter_grab_pointer:
- * @actor: a #ClutterActor
- *
- * Grabs pointer events, after the grab is done all pointer related events
- * (press, motion, release, enter, leave and scroll) are delivered to this
- * actor directly without passing through both capture and bubble phases of
- * the event delivery chain. The source set in the event will be the actor
- * that would have received the event if the pointer grab was not in effect.
- *
- * Grabs completely override the entire event delivery chain
- * done by Clutter. Pointer grabs should only be used as a last resource;
- * using the #ClutterActor::captured-event signal should always be the
- * preferred way to intercept event delivery to reactive actors.
- *
- * This function should rarely be used.
- *
- * If a grab is required, you are strongly encouraged to use a specific
- * input device by calling clutter_input_device_grab().
- *
- * Since: 0.6
- */
-void
-clutter_grab_pointer (ClutterActor *actor)
-{
-  ClutterMainContext *context;
-
-  g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
-
-  context = _clutter_context_get_default ();
-
-  if (context->pointer_grab_actor == actor)
-    return;
-
-  if (context->pointer_grab_actor != NULL)
-    {
-      g_signal_handlers_disconnect_by_func (context->pointer_grab_actor,
-                                            G_CALLBACK (on_grab_actor_destroy),
-                                            NULL);
-      context->pointer_grab_actor = NULL;
-    }
-
-  if (actor != NULL)
-    {
-      context->pointer_grab_actor = actor;
-
-      g_signal_connect (context->pointer_grab_actor, "destroy",
-                        G_CALLBACK (on_grab_actor_destroy),
-                        NULL);
-    }
-}
-
 /**
  * clutter_input_device_grab:
  * @device: a #ClutterInputDevice
@@ -2594,118 +2484,6 @@ clutter_input_device_get_grabbed_actor (ClutterInputDevice *device)
   return NULL;
 }
 
-/**
- * clutter_ungrab_pointer:
- *
- * Removes an existing grab of the pointer.
- *
- * Since: 0.6
- */
-void
-clutter_ungrab_pointer (void)
-{
-  clutter_grab_pointer (NULL);
-}
-
-/**
- * clutter_get_pointer_grab:
- *
- * Queries the current pointer grab of clutter.
- *
- * Return value: (transfer none): the actor currently holding the pointer grab, or NULL if there is no grab.
- *
- * Since: 0.6
- */
-ClutterActor *
-clutter_get_pointer_grab (void)
-{
-  ClutterMainContext *context;
-  context = _clutter_context_get_default ();
-
-  return context->pointer_grab_actor;
-}
-
-
-/**
- * clutter_grab_keyboard:
- * @actor: a #ClutterActor
- *
- * Grabs keyboard events, after the grab is done keyboard
- * events (#ClutterActor::key-press-event and #ClutterActor::key-release-event)
- * are delivered to this actor directly. The source set in the event will be
- * the actor that would have received the event if the keyboard grab was not
- * in effect.
- *
- * Like pointer grabs, keyboard grabs should only be used as a last
- * resource.
- *
- * See also clutter_stage_set_key_focus() and clutter_actor_grab_key_focus()
- * to perform a "soft" key grab and assign key focus to a specific actor.
- *
- * Since: 0.6
- */
-void
-clutter_grab_keyboard (ClutterActor *actor)
-{
-  ClutterMainContext *context;
-
-  g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
-
-  context = _clutter_context_get_default ();
-
-  if (context->keyboard_grab_actor == actor)
-    return;
-
-  if (context->keyboard_grab_actor != NULL)
-    {
-      g_signal_handlers_disconnect_by_func (context->keyboard_grab_actor,
-                                            G_CALLBACK (on_grab_actor_destroy),
-                                            NULL);
-      context->keyboard_grab_actor = NULL;
-    }
-
-  if (actor != NULL)
-    {
-      context->keyboard_grab_actor = actor;
-
-      g_signal_connect (context->keyboard_grab_actor, "destroy",
-                        G_CALLBACK (on_grab_actor_destroy),
-                        NULL);
-    }
-}
-
-/**
- * clutter_ungrab_keyboard:
- *
- * Removes an existing grab of the keyboard.
- *
- * Since: 0.6
- */
-void
-clutter_ungrab_keyboard (void)
-{
-  clutter_grab_keyboard (NULL);
-}
-
-/**
- * clutter_get_keyboard_grab:
- *
- * Queries the current keyboard grab of clutter.
- *
- * Return value: (transfer none): the actor currently holding the keyboard grab, or NULL if there is no grab.
- *
- * Since: 0.6
- */
-ClutterActor *
-clutter_get_keyboard_grab (void)
-{
-  ClutterMainContext *context;
-
-  context = _clutter_context_get_default ();
-
-  return context->keyboard_grab_actor;
-}
-
 /**
  * clutter_get_font_map:
  *
diff --git a/clutter/clutter/clutter-main.h b/clutter/clutter/clutter-main.h
index 70e40f958..16de42bf3 100644
--- a/clutter/clutter/clutter-main.h
+++ b/clutter/clutter/clutter-main.h
@@ -146,19 +146,6 @@ guint                   clutter_threads_add_repaint_func_full   (ClutterRepaintF
 CLUTTER_EXPORT
 void                    clutter_threads_remove_repaint_func     (guint          handle_id);
 
-CLUTTER_EXPORT
-void                    clutter_grab_pointer                    (ClutterActor  *actor);
-CLUTTER_EXPORT
-void                    clutter_ungrab_pointer                  (void);
-CLUTTER_EXPORT
-ClutterActor *          clutter_get_pointer_grab                (void);
-CLUTTER_EXPORT
-void                    clutter_grab_keyboard                   (ClutterActor  *actor);
-CLUTTER_EXPORT
-void                    clutter_ungrab_keyboard                 (void);
-CLUTTER_EXPORT
-ClutterActor *          clutter_get_keyboard_grab               (void);
-
 CLUTTER_EXPORT
 PangoFontMap *          clutter_get_font_map                    (void);
 
diff --git a/clutter/clutter/clutter-private.h b/clutter/clutter/clutter-private.h
index a97fd12c9..a4e69ce2b 100644
--- a/clutter/clutter/clutter-private.h
+++ b/clutter/clutter/clutter-private.h
@@ -142,10 +142,6 @@ struct _ClutterMainContext
   /* default FPS; this is only used if we cannot sync to vblank */
   guint frame_rate;
 
-  /* actors with a grab on all devices */
-  ClutterActor *pointer_grab_actor;
-  ClutterActor *keyboard_grab_actor;
-
   /* fb bit masks for col<->id mapping in picking */
   gint fb_r_mask;
   gint fb_g_mask;
diff --git a/clutter/tests/interactive/test-grab.c b/clutter/tests/interactive/test-grab.c
index 7c03a397b..cb48fe6cf 100644
--- a/clutter/tests/interactive/test-grab.c
+++ b/clutter/tests/interactive/test-grab.c
@@ -123,7 +123,9 @@ grab_pointer_cb (ClutterActor    *actor,
                  ClutterEvent    *event,
                  gpointer         data)
 {
-  clutter_grab_pointer (actor);
+  ClutterInputDevice *device = clutter_event_get_device (event);
+
+  clutter_input_device_grab (device, actor);
   return FALSE;
 }
 
@@ -132,7 +134,9 @@ red_release_cb (ClutterActor    *actor,
                 ClutterEvent    *event,
                 gpointer         data)
 {
-  clutter_ungrab_pointer ();
+  ClutterInputDevice *device = clutter_event_get_device (event);
+
+  clutter_input_device_ungrab (device);
   return FALSE;
 }
 
@@ -169,14 +173,17 @@ toggle_grab_pointer_cb (ClutterActor    *actor,
                         ClutterEvent    *event,
                         gpointer         data)
 {
+  ClutterInputDevice *device = clutter_event_get_device (event);
+
   /* we only deal with the event if the source is ourself */
   if (event->button.source == actor)
     {
-      if (clutter_get_pointer_grab () != NULL)
-        clutter_ungrab_pointer ();
+      if (clutter_input_device_get_grabbed_actor (device) != NULL)
+        clutter_input_device_ungrab (device);
       else
-        clutter_grab_pointer (actor);
+        clutter_input_device_grab (device, actor);
     }
+
   return FALSE;
 }
 
@@ -185,10 +192,15 @@ cyan_press_cb (ClutterActor    *actor,
                ClutterEvent    *event,
                gpointer         data)
 {
-  if (clutter_get_keyboard_grab () != NULL)
-    clutter_ungrab_keyboard ();
+  ClutterDeviceManager *dm = clutter_device_manager_get_default ();
+  ClutterInputDevice *device =
+    clutter_device_manager_get_core_device (dm, CLUTTER_KEYBOARD_DEVICE);
+
+  if (clutter_input_device_get_grabbed_actor (device) != NULL)
+    clutter_input_device_ungrab (device);
   else
-    clutter_grab_keyboard (actor);
+    clutter_input_device_grab (device, actor);
+
   return FALSE;
 }