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keybindings: Add API to freeze/unfreeze the keyboard

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We'll use this in gnome-shell to freeze the keyboard right before
switching input source and unfreeze it after that's finished so that
we don't lose any key events to the wrong input source.

https://bugzilla.gnome.org/show_bug.cgi?id=697001
This commit is contained in:
Rui Matos 2013-03-29 02:38:43 +01:00
parent f86032d700
commit 10df80762c
2 changed files with 47 additions and 4 deletions
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44
src/core/keybindings.c
View File

@ -1264,7 +1264,8 @@ grab_status_to_string (int status)
static gboolean
grab_keyboard (MetaDisplay *display,
Window xwindow,
guint32 timestamp)
guint32 timestamp,
int grab_mode)
{
int result;
int grab_status;
@ -1280,12 +1281,21 @@ grab_keyboard (MetaDisplay *display,
*/
meta_error_trap_push_with_return (display);
/* Strictly, we only need to set grab_mode on the keyboard device
* while the pointer should always be XIGrabModeAsync. Unfortunately
* there is a bug in the X server, only fixed (link below) in 1.15,
* which swaps these arguments for keyboard devices. As such, we set
* both the device and the paired device mode which works around
* that bug and also works on fixed X servers.
*
* http://cgit.freedesktop.org/xorg/xserver/commit/?id=9003399708936481083424b4ff8f18a16b88b7b3
*/
grab_status = XIGrabDevice (display->xdisplay,
META_VIRTUAL_CORE_KEYBOARD_ID,
xwindow,
timestamp,
None,
XIGrabModeAsync, XIGrabModeAsync,
grab_mode, grab_mode,
True, /* owner_events */
&mask);
@ -1339,7 +1349,7 @@ meta_screen_grab_all_keys (MetaScreen *screen, guint32 timestamp)
meta_topic (META_DEBUG_KEYBINDINGS,
"Grabbing all keys on RootWindow\n");
retval = grab_keyboard (screen->display, screen->xroot, timestamp);
retval = grab_keyboard (screen->display, screen->xroot, timestamp, XIGrabModeAsync);
if (retval)
{
screen->all_keys_grabbed = TRUE;
@ -1392,7 +1402,7 @@ meta_window_grab_all_keys (MetaWindow *window,
meta_topic (META_DEBUG_KEYBINDINGS,
"Grabbing all keys on window %s\n", window->desc);
retval = grab_keyboard (window->display, grabwindow, timestamp);
retval = grab_keyboard (window->display, grabwindow, timestamp, XIGrabModeAsync);
if (retval)
{
window->keys_grabbed = FALSE;
@ -1419,6 +1429,32 @@ meta_window_ungrab_all_keys (MetaWindow *window, guint32 timestamp)
}
}
void
meta_display_freeze_keyboard (MetaDisplay *display, Window window, guint32 timestamp)
{
grab_keyboard (display, window, timestamp, XIGrabModeSync);
}
void
meta_display_ungrab_keyboard (MetaDisplay *display, guint32 timestamp)
{
ungrab_keyboard (display, timestamp);
}
void
meta_display_unfreeze_keyboard (MetaDisplay *display, guint32 timestamp)
{
meta_error_trap_push (display);
XIAllowEvents (display->xdisplay, META_VIRTUAL_CORE_KEYBOARD_ID,
XIAsyncDevice, timestamp);
/* We shouldn't need to unfreeze the pointer device here, however we
* have to, due to the workaround we do in grab_keyboard().
*/
XIAllowEvents (display->xdisplay, META_VIRTUAL_CORE_POINTER_ID,
XIAsyncDevice, timestamp);
meta_error_trap_pop (display);
}
static gboolean
is_modifier (MetaDisplay *display,
unsigned int keycode)

7
src/meta/display.h
View File

@ -191,4 +191,11 @@ void meta_display_unmanage_screen (MetaDisplay *display,
void meta_display_clear_mouse_mode (MetaDisplay *display);
void meta_display_freeze_keyboard (MetaDisplay *display,
Window window,
guint32 timestamp);
void meta_display_ungrab_keyboard (MetaDisplay *display,
guint32 timestamp);
void meta_display_unfreeze_keyboard (MetaDisplay *display,
guint32 timestamp);
#endif