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/* keybinder.c
* Developed by Alex Graveley for Tomboy
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <gdk/gdk.h>
#include <gdk/gdkwindow.h>
#include <gdk/gdkx.h>
#include <X11/Xlib.h>
#include "eggaccelerators.h"
#include "keybinder.h"
/* Uncomment the next line to print a debug trace. */
/* #define DEBUG */
#ifdef DEBUG
# define TRACE(x) x
#else
# define TRACE(x) do {} while (FALSE);
#endif
typedef struct _Binding {
BindkeyHandler handler;
gpointer user_data;
char *keystring;
uint keycode;
uint modifiers;
} Binding;
static GSList *bindings = NULL;
static guint32 last_event_time = 0;
static gboolean processing_event = FALSE;
static guint num_lock_mask, caps_lock_mask, scroll_lock_mask;
static void
lookup_ignorable_modifiers (GdkKeymap *keymap)
{
egg_keymap_resolve_virtual_modifiers (keymap,
EGG_VIRTUAL_LOCK_MASK,
&caps_lock_mask);
egg_keymap_resolve_virtual_modifiers (keymap,
EGG_VIRTUAL_NUM_LOCK_MASK,
&num_lock_mask);
egg_keymap_resolve_virtual_modifiers (keymap,
EGG_VIRTUAL_SCROLL_LOCK_MASK,
&scroll_lock_mask);
}
static void
grab_ungrab_with_ignorable_modifiers (GdkWindow *rootwin,
Binding *binding,
gboolean grab)
{
guint mod_masks [] = {
0, /* modifier only */
num_lock_mask,
caps_lock_mask,
scroll_lock_mask,
num_lock_mask | caps_lock_mask,
num_lock_mask | scroll_lock_mask,
caps_lock_mask | scroll_lock_mask,
num_lock_mask | caps_lock_mask | scroll_lock_mask,
};
int i;
for (i = 0; i < G_N_ELEMENTS (mod_masks); i++) {
if (grab) {
XGrabKey (GDK_WINDOW_XDISPLAY (rootwin),
binding->keycode,
binding->modifiers | mod_masks [i],
GDK_WINDOW_XID (rootwin),
False,
GrabModeAsync,
GrabModeAsync);
} else {
XUngrabKey (GDK_WINDOW_XDISPLAY (rootwin),
binding->keycode,
binding->modifiers | mod_masks [i],
GDK_WINDOW_XID (rootwin));
}
}
}
static gboolean
do_grab_key (Binding *binding)
{
GdkKeymap *keymap = gdk_keymap_get_default ();
GdkWindow *rootwin = gdk_get_default_root_window ();
EggVirtualModifierType virtual_mods = 0;
guint keysym = 0;
if (keymap == NULL || rootwin == NULL)
return FALSE;
if (!egg_accelerator_parse_virtual (binding->keystring,
&keysym,
&virtual_mods))
return FALSE;
TRACE (g_print ("Got accel %d, %d\n", keysym, virtual_mods));
binding->keycode = XKeysymToKeycode (GDK_WINDOW_XDISPLAY (rootwin),
keysym);
if (binding->keycode == 0)
return FALSE;
TRACE (g_print ("Got keycode %d\n", binding->keycode));
egg_keymap_resolve_virtual_modifiers (keymap,
virtual_mods,
&binding->modifiers);
TRACE (g_print ("Got modmask %d\n", binding->modifiers));
gdk_error_trap_push ();
grab_ungrab_with_ignorable_modifiers (rootwin,
binding,
TRUE /* grab */);
gdk_flush ();
if (gdk_error_trap_pop ()) {
g_warning ("Binding '%s' failed!\n", binding->keystring);
return FALSE;
}
return TRUE;
}
static gboolean
do_ungrab_key (Binding *binding)
{
GdkWindow *rootwin = gdk_get_default_root_window ();
TRACE (g_print ("Removing grab for '%s'\n", binding->keystring));
grab_ungrab_with_ignorable_modifiers (rootwin,
binding,
FALSE /* ungrab */);
return TRUE;
}
static GdkFilterReturn
filter_func (GdkXEvent *gdk_xevent, GdkEvent *event, gpointer data)
{
GdkFilterReturn return_val = GDK_FILTER_CONTINUE;
XEvent *xevent = (XEvent *) gdk_xevent;
guint event_mods;
GSList *iter;
TRACE (g_print ("Got Event! %d, %d\n", xevent->type, event->type));
switch (xevent->type) {
case KeyPress:
TRACE (g_print ("Got KeyPress! keycode: %d, modifiers: %d\n",
xevent->xkey.keycode,
xevent->xkey.state));
/*
* Set the last event time for use when showing
* windows to avoid anti-focus-stealing code.
*/
processing_event = TRUE;
last_event_time = xevent->xkey.time;
event_mods = xevent->xkey.state & ~(num_lock_mask |
caps_lock_mask |
scroll_lock_mask);
for (iter = bindings; iter != NULL; iter = iter->next) {
Binding *binding = (Binding *) iter->data;
if (binding->keycode == xevent->xkey.keycode &&
binding->modifiers == event_mods) {
TRACE (g_print ("Calling handler for '%s'...\n",
binding->keystring));
(binding->handler) (binding->keystring,
binding->user_data);
}
}
processing_event = FALSE;
break;
case KeyRelease:
TRACE (g_print ("Got KeyRelease! \n"));
break;
}
return return_val;
}
static void
keymap_changed (GdkKeymap *map)
{
GdkKeymap *keymap = gdk_keymap_get_default ();
GSList *iter;
TRACE (g_print ("Keymap changed! Regrabbing keys..."));
for (iter = bindings; iter != NULL; iter = iter->next) {
Binding *binding = (Binding *) iter->data;
do_ungrab_key (binding);
}
lookup_ignorable_modifiers (keymap);
for (iter = bindings; iter != NULL; iter = iter->next) {
Binding *binding = (Binding *) iter->data;
do_grab_key (binding);
}
}
void
keybinder_init (void)
{
GdkKeymap *keymap = gdk_keymap_get_default ();
GdkWindow *rootwin = gdk_get_default_root_window ();
lookup_ignorable_modifiers (keymap);
gdk_window_add_filter (rootwin,
filter_func,
NULL);
g_signal_connect (keymap,
"keys_changed",
G_CALLBACK (keymap_changed),
NULL);
}
void
keybinder_bind (const char *keystring,
BindkeyHandler handler,
gpointer user_data)
{
Binding *binding;
gboolean success;
binding = g_new0 (Binding, 1);
binding->keystring = g_strdup (keystring);
binding->handler = handler;
binding->user_data = user_data;
/* Sets the binding's keycode and modifiers */
success = do_grab_key (binding);
if (success) {
bindings = g_slist_prepend (bindings, binding);
} else {
g_free (binding->keystring);
g_free (binding);
}
}
void
keybinder_unbind (const char *keystring,
BindkeyHandler handler)
{
GSList *iter;
for (iter = bindings; iter != NULL; iter = iter->next) {
Binding *binding = (Binding *) iter->data;
if (strcmp (keystring, binding->keystring) != 0 ||
handler != binding->handler)
continue;
do_ungrab_key (binding);
bindings = g_slist_remove (bindings, binding);
g_free (binding->keystring);
g_free (binding);
break;
}
}
/*
* From eggcellrenderkeys.c.
*/
gboolean
keybinder_is_modifier (guint keycode)
{
gint i;
gint map_size;
XModifierKeymap *mod_keymap;
gboolean retval = FALSE;
mod_keymap = XGetModifierMapping (
GDK_WINDOW_XDISPLAY(gdk_display_get_default()));
map_size = 8 * mod_keymap->max_keypermod;
i = 0;
while (i < map_size) {
if (keycode == mod_keymap->modifiermap[i]) {
retval = TRUE;
break;
}
++i;
}
XFreeModifiermap (mod_keymap);
return retval;
}
guint32
keybinder_get_current_event_time (void)
{
if (processing_event)
return last_event_time;
else
return GDK_CURRENT_TIME;
}