Re: XGrabKey

[Tristan Sloughter <kungfooguru gmail com>]

I did this in my program tilda like this:

   key_grab (gchar *key) {
   XModifierKeymap *modmap;
   unsigned int numlockmask = 0;
   unsigned int modmask = 0;
   gint i, j;

   /* Key grabbing stuff taken from yeahconsole who took it from evilwm */
   modmap = XGetModifierMapping(dpy);
   for (i = 0; i < 8; i++) {
       for (j = 0; j < modmap->max_keypermod; j++) {
           if (modmap->modifiermap[i * modmap->max_keypermod + j] == 
XKeysymToKeycode(dpy, XK_Num_Lock)) {
               numlockmask = (1 << i);
           }
       }
   }
   XFreeModifiermap(modmap);

   if (strstr(key, "Control"))
       modmask = modmask | ControlMask;

   if (strstr(key, "Alt"))
       modmask = modmask | Mod1Mask;

   if (strstr(key, "Win"))
       modmask = modmask | Mod4Mask;

   if (strstr(key, "None"))
       modmask = 0;

   if (strtok(key, "+"))
       key = XStringToKeysym(strtok(NULL, "+"));

   XGrabKey(dpy, XKeysymToKeycode(dpy, key), modmask, root, True, 
GrabModeAsync, GrabModeAsync);
   XGrabKey(dpy, XKeysymToKeycode(dpy, key), LockMask | modmask, root, 
True, GrabModeAsync, GrabModeAsync);

   if (numlockmask)
   {
       XGrabKey(dpy, XKeysymToKeycode(dpy, key), numlockmask | modmask, 
root, True, GrabModeAsync, GrabModeAsync);
       XGrabKey(dpy, XKeysymToKeycode(dpy, key), numlockmask | LockMask 
| modmask, root, True, GrabModeAsync,                     GrabModeAsync);
   }
   }


   some_function()
{
   KeySym grabbed_key;
   XEvent event;

   if (!(dpy = XOpenDisplay(NULL)))
       fprintf (stderr, "Can't open Display %s", XDisplayName(NULL));

   screen = DefaultScreen(dpy);
   root = RootWindow(dpy, screen);

   key_grab ();

   for (;;)
   {
       XNextEvent(dpy, &event);

       switch (event.type)
       {
           case KeyPress:
               grabbed_key = XKeycodeToKeysym(dpy, event.xkey.keycode, 0);

               if (key == grabbed_key)
               {
                   WHATEVER_YOU_WANT_IT_TO_DO ();
                   break;
               }
           default:
               break;
       }
   }

Sorry for the lots of source and no comments, just wanted to pop this 
out quickly in hopes it would help you.

Tristan

Mario Levinsky wrote:

> Hi!
>
> I would like to make possilbe in my gtk+ application using global hot keys,
> I found xbindkeys application, and use part of its code.
>
> Usage is simple: 
>
> first I call this
>
> void grab_keys(Display *dpy, Keys_t *keys, int nb_keys);
>
> and after that I catch XKeyEvent.
>
> In xbindkeys it works,
>
> in gtk application I use instead of dpy
>
> gdk_x11_display_get_xdisplay(gdk_screen_get_display(gtk_window_get_screen(GTK_WINDOW(topLevelWindow))))
>
> instead of XKeyEvent
> "key_press_event" of topLevelWindow,
>
> but I got strange result, I press key and my window has focus, I can catch
> all keys with the exclusion of which I give grab_keys functions,
> and when my window has no focus I can not catch anything.
>
> Any help?
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>