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compositor: Spoof events on the guard window

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This allows events generated for the guard window to be picked up
by Clutter as if they were events for the mutter stage.

https://bugzilla.gnome.org/show_bug.cgi?id=681540
This commit is contained in:
Jasper St. Pierre 2012-12-21 07:32:41 -05:00
parent f5de1c78af
commit 5e9621ed80
1 changed files with 48 additions and 0 deletions
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48
src/compositor/compositor.c
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@ -812,6 +812,52 @@ meta_compositor_window_shape_changed (MetaCompositor *compositor,
meta_window_actor_update_shape (window_actor);
}
/* Clutter makes the assumption that there is only one X window
* per stage, which is a valid assumption to make for a generic
* application toolkit. As such, it will ignore any events sent
* to the a stage that isn't its X window.
*
* When a user clicks on what she thinks is the wallpaper, she
* is actually clicking on the guard window, which is an entirely
* separate top-level override-redirect window in the hierarchy.
* We want to recieve events on this guard window so that users
* can right-click on the background actor. We do this by telling
* Clutter a little white lie, by transforming clicks on the guard
* window to become clicks on the stage window, allowing Clutter
* to process the event normally.
*/
static void
maybe_spoof_guard_window_event_as_stage_event (MetaCompScreen *info,
XEvent *event)
{
MetaDisplay *display = meta_screen_get_display (info->screen);
if (event->type == GenericEvent &&
event->xcookie.extension == display->xinput_opcode)
{
XIEvent *input_event = (XIEvent *) event->xcookie.data;
/* Only care about pointer events for now. */
switch (input_event->evtype)
{
case XI_Motion:
case XI_ButtonPress:
case XI_ButtonRelease:
{
XIDeviceEvent *device_event = ((XIDeviceEvent *) input_event);
if (device_event->event == info->screen->guard_window)
{
Window xwin = clutter_x11_get_stage_window (CLUTTER_STAGE (info->stage));
device_event->event = xwin;
}
}
break;
default:
break;
}
}
}
/**
* meta_compositor_process_event: (skip)
*
@ -860,6 +906,8 @@ meta_compositor_process_event (MetaCompositor *compositor,
info = meta_screen_get_compositor_data (screen);
maybe_spoof_guard_window_event_as_stage_event (info, event);
if (meta_plugin_manager_xevent_filter (info->plugin_mgr, event))
{
DEBUG_TRACE ("meta_compositor_process_event (filtered,window==NULL)\n");