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Diffstat (limited to 'lib/src/sugar-key-grabber.c')
-rw-r--r-- | lib/src/sugar-key-grabber.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/lib/src/sugar-key-grabber.c b/lib/src/sugar-key-grabber.c new file mode 100644 index 0000000..f31e012 --- /dev/null +++ b/lib/src/sugar-key-grabber.c @@ -0,0 +1,249 @@ +/* + * Copyright (C) 2006 Red Hat, Inc + * + * Sugar 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. + * + * Sugar 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 <X11/X.h> +#include <gdk/gdkscreen.h> +#include <gdk/gdkx.h> +#include <gdk/gdk.h> + +#include "sugar-key-grabber.h" +#include "eggaccelerators.h" + +/* we exclude shift, GDK_CONTROL_MASK and GDK_MOD1_MASK since we know what + these modifiers mean + these are the mods whose combinations are bound by the keygrabbing code */ +#define IGNORED_MODS (0x2000 /*Xkb modifier*/ | GDK_LOCK_MASK | \ + GDK_MOD2_MASK | GDK_MOD3_MASK | GDK_MOD4_MASK | GDK_MOD5_MASK) +/* these are the ones we actually use for global keys, we always only check + * for these set */ +#define USED_MODS (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK) + +struct _SugarKeyGrabber { + GObject base_instance; + + GdkWindow *root; + GList *keys; +}; + +struct _SugarKeyGrabberClass { + GObjectClass base_class; + + void (* key_pressed) (SugarKeyGrabber *grabber, + const char *key); + void (* key_released) (SugarKeyGrabber *grabber, + const char *key); +}; + +enum { + KEY_PRESSED, + KEY_RELEASED, + N_SIGNALS +}; + +typedef struct { + char *key; + guint keysym; + guint state; + guint keycode; +} Key; + +G_DEFINE_TYPE(SugarKeyGrabber, sugar_key_grabber, G_TYPE_OBJECT) + +static guint signals[N_SIGNALS]; + +static void +free_key_info(Key *key_info) +{ + g_free(key_info->key); + g_free(key_info); +} + +static void +sugar_key_grabber_dispose (GObject *object) +{ + SugarKeyGrabber *grabber = SUGAR_KEY_GRABBER(object); + + if (grabber->keys) { + g_list_foreach(grabber->keys, (GFunc)free_key_info, NULL); + g_list_free(grabber->keys); + grabber->keys = NULL; + } +} + +static void +sugar_key_grabber_class_init(SugarKeyGrabberClass *grabber_class) +{ + GObjectClass *g_object_class = G_OBJECT_CLASS (grabber_class); + + g_object_class->dispose = sugar_key_grabber_dispose; + + signals[KEY_PRESSED] = g_signal_new ("key-pressed", + G_TYPE_FROM_CLASS (grabber_class), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (SugarKeyGrabberClass, key_pressed), + NULL, NULL, + g_cclosure_marshal_VOID__STRING, + G_TYPE_NONE, 1, + G_TYPE_STRING); + signals[KEY_RELEASED] = g_signal_new ("key-released", + G_TYPE_FROM_CLASS (grabber_class), + G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, + G_STRUCT_OFFSET (SugarKeyGrabberClass, key_released), + NULL, NULL, + g_cclosure_marshal_VOID__STRING, + G_TYPE_NONE, 1, + G_TYPE_STRING); +} + +static char * +get_key_from_event(SugarKeyGrabber *grabber, XEvent *xev) +{ + GList *l; + guint keycode, state; + + keycode = xev->xkey.keycode; + state = xev->xkey.state; + + for (l = grabber->keys; l != NULL; l = l->next) { + Key *keyinfo = (Key *)l->data; + if (keyinfo->keycode == keycode && + (state & USED_MODS) == keyinfo->state) { + return g_strdup(keyinfo->key); + } + } + + return NULL; +} + +static GdkFilterReturn +filter_events(GdkXEvent *xevent, GdkEvent *event, gpointer data) +{ + SugarKeyGrabber *grabber = (SugarKeyGrabber *)data; + XEvent *xev = (XEvent *)xevent; + + if (xev->type == KeyRelease) { + char *key; + + key = get_key_from_event(grabber, xevent); + if (key) { + g_signal_emit (grabber, signals[KEY_RELEASED], 0, key); + g_free(key); + + XUngrabKeyboard (GDK_WINDOW_XDISPLAY (grabber->root), 0L); + + return GDK_FILTER_REMOVE; + } + } + + if (xev->type == KeyPress) { + char *key; + + key = get_key_from_event(grabber, xevent); + if (key) { + g_signal_emit (grabber, signals[KEY_PRESSED], 0, key); + g_free(key); + + XGrabKeyboard (GDK_WINDOW_XDISPLAY (grabber->root), + GDK_WINDOW_XID (grabber->root), + 0, GrabModeAsync, GrabModeAsync, 0L); + + return GDK_FILTER_REMOVE; + } + } + + return GDK_FILTER_CONTINUE; +} + +static void +sugar_key_grabber_init(SugarKeyGrabber *grabber) +{ + GdkScreen *screen; + + screen = gdk_screen_get_default(); + grabber->root = gdk_screen_get_root_window(screen); + grabber->keys = NULL; + + gdk_window_add_filter(grabber->root, filter_events, grabber); +} + +/* grab_key and grab_key_real are from + * gnome-control-center/gnome-settings-daemon/gnome-settings-multimedia-keys.c + */ + +static gboolean +grab_key_real (Key *key, GdkWindow *root, gboolean grab, int result) +{ + gdk_error_trap_push (); + if (grab) + XGrabKey (GDK_DISPLAY(), key->keycode, (result | key->state), + GDK_WINDOW_XID (root), True, GrabModeAsync, GrabModeAsync); + else + XUngrabKey(GDK_DISPLAY(), key->keycode, (result | key->state), + GDK_WINDOW_XID (root)); + gdk_flush (); + + gdk_error_trap_pop (); + + return TRUE; +} + +#define N_BITS 32 +static void +grab_key (SugarKeyGrabber *grabber, Key *key, gboolean grab) +{ + int indexes[N_BITS];/*indexes of bits we need to flip*/ + int i, bit, bits_set_cnt; + int uppervalue; + guint mask_to_traverse = IGNORED_MODS & ~ key->state; + + bit = 0; + for (i = 0; i < N_BITS; i++) { + if (mask_to_traverse & (1<<i)) + indexes[bit++]=i; + } + + bits_set_cnt = bit; + + uppervalue = 1<<bits_set_cnt; + for (i = 0; i < uppervalue; i++) { + int j, result = 0; + + for (j = 0; j < bits_set_cnt; j++) { + if (i & (1<<j)) + result |= (1<<indexes[j]); + } + + if (grab_key_real (key, grabber->root, grab, result) == FALSE) + return; + } +} + +void +sugar_key_grabber_grab(SugarKeyGrabber *grabber, const char *key) +{ + Key *keyinfo; + + keyinfo = g_new0 (Key, 1); + keyinfo->key = g_strdup(key); + egg_accelerator_parse_virtual (key, &keyinfo->keysym, + &keyinfo->keycode, &keyinfo->state); + + grab_key(grabber, keyinfo, TRUE); + + grabber->keys = g_list_append(grabber->keys, keyinfo); +} |