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Don't expose a temporary grab during a scrollwheel button press/release cycle.

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If we do this there is a short window where we think there is a grab, and
if we generate a client side pointer motion event in this time (e.g. from
a window move) we could be delivering that according to the grab. But in
the Xserver that grab is infinitely short as it sends Press and then
Release immediately.

To see a problem from this, try using the scrollwheel to quickly scroll
in the testgtk list of buttons.
This commit is contained in:
Alexander Larsson 2009-01-21 14:42:46 +01:00 committed by Alexander Larsson
parent 7cebc68bde
commit 8a0ef57ba3
1 changed files with 12 additions and 7 deletions
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19
gdk/x11/gdkevents-x11.c
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@ -1213,7 +1213,15 @@ gdk_event_translate (GdkDisplay *display,
set_user_time (window, event);
_gdk_xgrab_check_button_event (window, xevent);
/* We treat button presses as scroll wheel events, so don't expose
* this grab to gtk, as it will be immediately released. If we do
* expose it there is a short time before we receive the Release
* where a client-side generated pointer motion event could be handled
* as if the grab was effect.
*/
if (!(xevent->xbutton.button == 4 || xevent->xbutton.button == 5 ||
xevent->xbutton.button == 6 || xevent->xbutton.button == 7))
_gdk_xgrab_check_button_event (window, xevent);
break;
case ButtonRelease:
@ -1236,7 +1244,7 @@ gdk_event_translate (GdkDisplay *display,
xevent->xbutton.button == 6 || xevent->xbutton.button ==7)
{
return_val = FALSE;
goto release_out;
break;
}
event->button.type = GDK_BUTTON_RELEASE;
@ -1252,13 +1260,10 @@ gdk_event_translate (GdkDisplay *display,
event->button.device = display->core_pointer;
if (!set_screen_from_root (display, event, xevent->xbutton.root))
{
return_val = FALSE;
goto release_out;
}
return_val = FALSE;
release_out:
_gdk_xgrab_check_button_event (window, xevent);
break;
case MotionNotify: