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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2001-2003 Bastien Nocera <hadess@hadess.net>
* Copyright (C) 2006-2007 William Jon McCann <mccann@jhu.edu>
* Copyright (C) 2008 Jens Granseuer <jensgr@gmx.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "config.h"
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#ifdef HAVE_X11_EXTENSIONS_XKB_H
#include <X11/XKBlib.h>
#include <X11/extensions/XKB.h>
#include <gdk/gdkkeysyms.h>
#endif
#include "eggaccelerators.h"
#include "msd-keygrab.h"
/* these are the mods whose combinations are ignored by the keygrabbing code */
static GdkModifierType msd_ignored_mods = 0;
/* these are the ones we actually use for global keys, we always only check
* for these set */
static GdkModifierType msd_used_mods = 0;
static void
setup_modifiers (void)
{
if (msd_used_mods == 0 || msd_ignored_mods == 0) {
GdkModifierType dynmods;
/* default modifiers */
msd_ignored_mods = \
0x2000 /*Xkb modifier*/ | GDK_LOCK_MASK | GDK_HYPER_MASK;
msd_used_mods = \
GDK_SHIFT_MASK | GDK_CONTROL_MASK |\
GDK_MOD1_MASK | GDK_MOD2_MASK | GDK_MOD3_MASK | GDK_MOD4_MASK |\
GDK_MOD5_MASK | GDK_SUPER_MASK | GDK_META_MASK;
/* NumLock can be assigned to varying keys so we need to
* resolve and ignore it specially */
dynmods = 0;
egg_keymap_resolve_virtual_modifiers (gdk_keymap_get_default (),
EGG_VIRTUAL_NUM_LOCK_MASK,
&dynmods);
msd_ignored_mods |= dynmods;
msd_used_mods &= ~dynmods;
}
}
static void
grab_key_real (guint keycode,
GdkWindow *root,
gboolean grab,
int mask)
{
if (grab) {
XGrabKey (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
keycode,
mask,
GDK_WINDOW_XID (root),
True,
GrabModeAsync,
GrabModeAsync);
} else {
XUngrabKey (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
keycode,
mask,
GDK_WINDOW_XID (root));
}
}
/* Grab the key. In order to ignore MSD_IGNORED_MODS we need to grab
* all combinations of the ignored modifiers and those actually used
* for the binding (if any).
*
* inspired by all_combinations from mate-panel/mate-panel/global-keys.c
*
* This may generate X errors. The correct way to use this is like:
*
* gdk_error_trap_push ();
*
* grab_key_unsafe (key, grab, screens);
*
* gdk_flush ();
* if (gdk_error_trap_pop ())
* g_warning ("Grab failed, another application may already have access to key '%u'",
* key->keycode);
*
* This is not done in the function itself, to allow doing multiple grab_key
* operations with one flush only.
*/
#define N_BITS 32
void
grab_key_unsafe (Key *key,
gboolean grab,
GSList *screens)
{
int indexes[N_BITS]; /* indexes of bits we need to flip */
int i;
int bit;
int bits_set_cnt;
int uppervalue;
guint mask;
setup_modifiers ();
mask = msd_ignored_mods & ~key->state & GDK_MODIFIER_MASK;
bit = 0;
/* store the indexes of all set bits in mask in the array */
for (i = 0; mask; ++i, mask >>= 1) {
if (mask & 0x1) {
indexes[bit++] = i;
}
}
bits_set_cnt = bit;
uppervalue = 1 << bits_set_cnt;
/* grab all possible modifier combinations for our mask */
for (i = 0; i < uppervalue; ++i) {
GSList *l;
int j;
int result = 0;
/* map bits in the counter to those in the mask */
for (j = 0; j < bits_set_cnt; ++j) {
if (i & (1 << j)) {
result |= (1 << indexes[j]);
}
}
for (l = screens; l; l = l->next) {
GdkScreen *screen = l->data;
guint *code;
for (code = key->keycodes; *code; ++code) {
grab_key_real (*code,
gdk_screen_get_root_window (screen),
grab,
result | key->state);
}
}
}
}
static gboolean
have_xkb (Display *dpy)
{
static int have_xkb = -1;
if (have_xkb == -1) {
#ifdef HAVE_X11_EXTENSIONS_XKB_H
int opcode, error_base, major, minor, xkb_event_base;
have_xkb = XkbQueryExtension (dpy,
&opcode,
&xkb_event_base,
&error_base,
&major,
&minor)
&& XkbUseExtension (dpy, &major, &minor);
#else
have_xkb = 0;
#endif
}
return have_xkb;
}
gboolean
key_uses_keycode (const Key *key, guint keycode)
{
if (key->keycodes != NULL) {
guint *c;
for (c = key->keycodes; *c; ++c) {
if (*c == keycode)
return TRUE;
}
}
return FALSE;
}
gboolean
match_key (Key *key, XEvent *event)
{
guint keyval;
GdkModifierType consumed;
gint group;
if (key == NULL)
return FALSE;
setup_modifiers ();
#ifdef HAVE_X11_EXTENSIONS_XKB_H
if (have_xkb (event->xkey.display))
group = XkbGroupForCoreState (event->xkey.state);
else
#endif
group = (event->xkey.state & GDK_Mode_switch) ? 1 : 0;
/* Check if we find a keysym that matches our current state */
if (gdk_keymap_translate_keyboard_state (NULL, event->xkey.keycode,
event->xkey.state, group,
&keyval, NULL, NULL, &consumed)) {
guint lower, upper;
gdk_keyval_convert_case (keyval, &lower, &upper);
/* If we are checking against the lower version of the
* keysym, we might need the Shift state for matching,
* so remove it from the consumed modifiers */
if (lower == key->keysym)
consumed &= ~GDK_SHIFT_MASK;
return ((lower == key->keysym || upper == key->keysym)
&& (event->xkey.state & ~consumed & msd_used_mods) == key->state);
}
/* The key we passed doesn't have a keysym, so try with just the keycode */
return (key != NULL
&& key->state == (event->xkey.state & msd_used_mods)
&& key_uses_keycode (key, event->xkey.keycode));
}
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