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window: Add comment documenting the target widget checks during window drag

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Was suggested during review of
https://bugzilla.gnome.org/show_bug.cgi?id=745562#c2
This commit is contained in:
Carlos Garnacho 2015-03-03 22:17:58 +01:00
parent 08b5de7836
commit 40c8d8bcf4
1 changed files with 9 additions and 0 deletions
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9
gtk/gtkwindow.c
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@ -1549,6 +1549,15 @@ drag_gesture_update_cb (GtkGestureDrag *gesture,
event = gtk_gesture_get_last_event (GTK_GESTURE (gesture), sequence);
event_widget = gtk_get_event_widget ((GdkEvent *) event);
/* Check whether the target widget should be left alone at handling
* the sequence, this is better done late to give room for gestures
* there to go denied.
*
* Besides claiming gestures, we must bail out too if there's gestures
* in the "none" state at this point, as those are still handling events
* and can potentially go claimed, and we don't want to stop the target
* widget from doing anything.
*/
if (event_widget != GTK_WIDGET (window) &&
!gtk_widget_has_grab (event_widget) &&
_gtk_widget_consumes_motion (event_widget, sequence))