[gtk+/gestures: 57/117] Revert "gtk: Remove propagation limit of captured events on the grab widget"

[Carlos Garnacho <carlosg src gnome org>]

commit 0f1ef1677f432fc925e4a0fde713b3543b6bbce0
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Apr 3 14:44:58 2014 +0200

    Revert "gtk: Remove propagation limit of captured events on the grab widget"
    
    This reverts commit 6511f411955adba4f960b8b07d39b93785afe33e.

 gtk/gtkmain.c |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index 657aab0..dfcc906 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -1496,6 +1496,7 @@ gtk_main_do_event (GdkEvent *event)
 {
   GtkWidget *event_widget;
   GtkWidget *grab_widget = NULL;
+  GtkWidget *topmost_widget = NULL;
   GtkWindowGroup *window_group;
   GdkEvent *rewritten_event = NULL;
   GdkDevice *device;
@@ -1555,6 +1556,14 @@ gtk_main_do_event (GdkEvent *event)
   if (!grab_widget)
     grab_widget = gtk_window_group_get_current_grab (window_group);
 
+  /* Find out the topmost widget where captured event propagation
+   * should start, which is the widget holding the GTK+ grab
+   * if any, otherwise it's left NULL and events are emitted
+   * from the toplevel (or topmost parentless parent).
+   */
+  if (grab_widget)
+    topmost_widget = grab_widget;
+
   /* If the grab widget is an ancestor of the event widget
    * then we send the event to the original event widget.
    * This is the key to implementing modality.
@@ -1668,7 +1677,7 @@ gtk_main_do_event (GdkEvent *event)
     case GDK_2BUTTON_PRESS:
     case GDK_3BUTTON_PRESS:
     case GDK_TOUCH_BEGIN:
-      if (!_gtk_propagate_captured_event (grab_widget, event, NULL))
+      if (!_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
         gtk_propagate_event (grab_widget, event);
       break;
 
@@ -1716,19 +1725,19 @@ gtk_main_do_event (GdkEvent *event)
     case GDK_TOUCH_UPDATE:
     case GDK_TOUCH_END:
     case GDK_TOUCH_CANCEL:
-      if (!_gtk_propagate_captured_event (grab_widget, event, NULL))
+      if (!_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
         gtk_propagate_event (grab_widget, event);
       break;
 
     case GDK_ENTER_NOTIFY:
       if (gtk_widget_is_sensitive (grab_widget) &&
-          !_gtk_propagate_captured_event (grab_widget, event, NULL))
+          !_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
         gtk_widget_event (grab_widget, event);
       break;
 
     case GDK_LEAVE_NOTIFY:
       if (gtk_widget_is_sensitive (grab_widget) &&
-          !_gtk_propagate_captured_event (grab_widget, event, NULL))
+          !_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
         gtk_widget_event (grab_widget, event);
       break;