wayland: Add meta_wayland_compositor_is_grabbed() method

This will return TRUE if there is an existing pointer or keyboard
grab from the wayland compositor.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2683>

src/wayland/meta-wayland-keyboard.c

@@ -926,3 +926,9 @@ meta_wayland_keyboard_class_init (MetaWaylandKeyboardClass *klass)
 
   object_class->finalize = meta_wayland_keyboard_finalize;
 }
+
+gboolean
+meta_wayland_keyboard_is_grabbed (MetaWaylandKeyboard *keyboard)
+{
+  return keyboard->grab != &keyboard->default_grab;
+}

src/wayland/meta-wayland-keyboard.h

@@ -142,4 +142,6 @@ void meta_wayland_keyboard_start_grab (MetaWaylandKeyboard     *keyboard,
                                        MetaWaylandKeyboardGrab *grab);
 void meta_wayland_keyboard_end_grab   (MetaWaylandKeyboard     *keyboard);
 
+gboolean meta_wayland_keyboard_is_grabbed (MetaWaylandKeyboard *keyboard);
+
 #endif /* META_WAYLAND_KEYBOARD_H */

src/wayland/meta-wayland-pointer.c

@@ -1571,3 +1571,9 @@ meta_wayland_pointer_class_init (MetaWaylandPointerClass *klass)
                                                  NULL, NULL, NULL,
                                                  G_TYPE_NONE, 0);
 }
+
+gboolean
+meta_wayland_pointer_is_grabbed (MetaWaylandPointer *pointer)
+{
+  return pointer->grab != &pointer->default_grab;
+}

src/wayland/meta-wayland-pointer.h

@@ -159,4 +159,6 @@ void meta_wayland_surface_cursor_update (MetaWaylandSurface *cursor_surface);
 
 void meta_wayland_pointer_update_cursor_surface (MetaWaylandPointer *pointer);
 
+gboolean meta_wayland_pointer_is_grabbed (MetaWaylandPointer *pointer);
+
 #endif /* META_WAYLAND_POINTER_H */

src/wayland/meta-wayland-seat.c

@@ -534,3 +534,17 @@ meta_wayland_seat_get_compositor (MetaWaylandSeat *seat)
 {
   return seat->compositor;
 }
+
+gboolean
+meta_wayland_seat_is_grabbed (MetaWaylandSeat *seat)
+{
+  if (meta_wayland_seat_has_pointer (seat) &&
+      meta_wayland_pointer_is_grabbed (seat->pointer))
+    return TRUE;
+
+  if (meta_wayland_seat_has_keyboard (seat) &&
+      meta_wayland_keyboard_is_grabbed (seat->keyboard))
+    return TRUE;
+
+  return FALSE;
+}

src/wayland/meta-wayland-seat.h

@@ -84,4 +84,6 @@ gboolean meta_wayland_seat_has_touch (MetaWaylandSeat *seat);
 
 MetaWaylandCompositor * meta_wayland_seat_get_compositor (MetaWaylandSeat *seat);
 
+gboolean meta_wayland_seat_is_grabbed (MetaWaylandSeat *seat);
+
 #endif /* META_WAYLAND_SEAT_H */

src/wayland/meta-wayland.c

@@ -849,3 +849,9 @@ meta_wayland_compositor_get_context (MetaWaylandCompositor *compositor)
 {
   return compositor->context;
 }
+
+gboolean
+meta_wayland_compositor_is_grabbed (MetaWaylandCompositor *compositor)
+{
+  return meta_wayland_seat_is_grabbed (compositor->seat);
+}

src/wayland/meta-wayland.h

@@ -103,4 +103,6 @@ META_EXPORT_TEST
 MetaContext * meta_wayland_compositor_get_context (MetaWaylandCompositor *compositor);
 
 
+gboolean meta_wayland_compositor_is_grabbed (MetaWaylandCompositor *compositor);
+
 #endif