gdk: Add internal API to deal with touch implicit grabs

The necessary information about a touch implicit grab is stored in
GdkTouchGrabInfo structs, these are meant to be transient to the
touch sequence.

1 files changed, 103 insertions, 0 deletions

diff --git a/gdk/gdkdisplay.c b/gdk/gdkdisplay.c
index bb4be5f6b2..5684247ca0 100644
--- a/gdk/gdkdisplay.c
+++ b/gdk/gdkdisplay.c
@@ -186,6 +186,7 @@ gdk_display_init (GdkDisplay *display)
   display->double_click_time = 250;
   display->double_click_distance = 5;
 
+  display->touch_implicit_grabs = g_array_new (FALSE, FALSE, sizeof (GdkTouchGrabInfo));
   display->device_grabs = g_hash_table_new (NULL, NULL);
   display->motion_hint_info = g_hash_table_new_full (NULL, NULL, NULL,
                                                      (GDestroyNotify) g_free);
@@ -234,6 +235,8 @@ gdk_display_finalize (GObject *object)
                                NULL);
   g_hash_table_destroy (display->device_grabs);
 
+  g_array_free (display->touch_implicit_grabs, TRUE);
+
   g_hash_table_destroy (display->motion_hint_info);
   g_hash_table_destroy (display->pointers_info);
   g_hash_table_destroy (display->multiple_click_info);
@@ -692,6 +695,79 @@ _gdk_display_add_device_grab (GdkDisplay       *display,
   return info;
 }
 
+static void
+_gdk_display_break_touch_grabs (GdkDisplay *display,
+                                GdkDevice  *device,
+                                GdkWindow  *new_grab_window)
+{
+  guint i = 0;
+
+  while (i < display->touch_implicit_grabs->len)
+    {
+      GdkTouchGrabInfo *info;
+
+      info = &g_array_index (display->touch_implicit_grabs,
+                             GdkTouchGrabInfo, i);
+
+      if (info->device == device &&
+          info->window != new_grab_window)
+        {
+          generate_grab_broken_event (GDK_WINDOW (info->window),
+                                      device, TRUE, new_grab_window);
+          g_array_remove_index_fast (display->touch_implicit_grabs, i);
+        }
+      else
+        i++;
+    }
+}
+
+void
+_gdk_display_add_touch_grab (GdkDisplay       *display,
+                             GdkDevice        *device,
+                             GdkEventSequence *sequence,
+                             GdkWindow        *window,
+                             GdkWindow        *native_window,
+                             GdkEventMask      event_mask,
+                             unsigned long     serial,
+                             guint32           time)
+{
+  GdkTouchGrabInfo info;
+
+  info.device = device;
+  info.sequence = sequence;
+  info.window = g_object_ref (window);
+  info.native_window = g_object_ref (native_window);
+  info.serial = serial;
+  info.event_mask = event_mask;
+  info.time = time;
+
+  g_array_append_val (display->touch_implicit_grabs, info);
+}
+
+gboolean
+_gdk_display_end_touch_grab (GdkDisplay       *display,
+                             GdkDevice        *device,
+                             GdkEventSequence *sequence)
+{
+  guint i;
+
+  for (i = 0; i < display->touch_implicit_grabs->len; i++)
+    {
+      GdkTouchGrabInfo *info;
+
+      info = &g_array_index (display->touch_implicit_grabs,
+                             GdkTouchGrabInfo, i);
+
+      if (info->device == device && info->sequence == sequence)
+        {
+          g_array_remove_index_fast (display->touch_implicit_grabs, i);
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
+
 /* _gdk_synthesize_crossing_events only works inside one toplevel.
    This function splits things into two calls if needed, converting the
    coordinates to the right toplevel */
@@ -1037,6 +1113,33 @@ _gdk_display_has_device_grab (GdkDisplay *display,
   return NULL;
 }
 
+GdkTouchGrabInfo *
+_gdk_display_has_touch_grab (GdkDisplay       *display,
+                             GdkDevice        *device,
+                             GdkEventSequence *sequence,
+                             gulong            serial)
+{
+  guint i;
+
+  for (i = 0; i < display->touch_implicit_grabs->len; i++)
+    {
+      GdkTouchGrabInfo *info;
+
+      info = &g_array_index (display->touch_implicit_grabs,
+                             GdkTouchGrabInfo, i);
+
+      if (info->device == device && info->sequence == sequence)
+        {
+          if (serial >= info->serial)
+            return info;
+          else
+            return NULL;
+        }
+    }
+
+  return NULL;
+}
+
 /* Returns true if last grab was ended
  * If if_child is non-NULL, end the grab only if the grabbed
  * window is the same as if_child or a descendant of it */