Lex Trotman wrote:
On 2 March 2010 15:29, Vikram Noel Ambrose <noel.ambrose@xxxxxxxxx <mailto:noel.ambrose@xxxxxxxxx>> wrote:I'd like to capture global key press events to enable a "Global Shortcuts" feature in my application. I've looked at a few other projects that have such capabilities and they all seem to hook straight into xlib. Is there a more GTK way of doing it? At the moment I'm using, XKeysymToKeycode($DISPLAY,XStringToKeysym("some key in here")); And then passing the resulting key code to XGrabKey, XGrabKey($DISPLAY,key,Mod4Mask|ShiftMask,$WINDOW,True,GrabModeAsync,GrabModeAsync); Then I call XSync($DISPLAY,0); I dont know why, but if I dont, gtk segfaults. I then wait for events with XNextEvent($DISPLAY,&event); inside a pthread and when an event comes by, i call a signal callback surrounded with gdk_threads_enter and _leave. Now all this worked nicely for a while, but somehow I've managed to break it :( It doesnt seem to pick up the events from the keys I passed to XGrabKeys anymore. If I switch to AnyModifier, it picks things up, but obviously the keyboard becomes unusable for other applications then. I believe XGrabKeys will alert me with a BadAccess error if i try to use a key that is already being grabbed by another x client, but I dont know how well this mechanism works. Mod4Mask seems to refer to the Super Key, aka, "Windows Key". So in my example I have modifiers Shift+Super and keycode "key". When it worked, I had Shift+Super+{z,x,c,v,b} setup. Now nothing works and for the best of me, I can't seem to understand what I've changed. A little background information: My app is heavily threaded, there are about 12+ threads at any given time. They are all created with pthread_create, and use gdk_threads_enter/leave before touching anything gdk/gtk/glib related. In main() I call g_thread_init( NULL ); and gdk_threads_init(); before gtk_init(argc,argv); I've read in some places one should surround gtk_main() with gdk_threads_enter/leave, but this absolutely doesnt make any sense to me. If I try to do that, the app locks in gtk_main and doesnt startup. My assumption is that gdk_threads_enter() "acts" like sem_wait() and gdk_threads_leave() acts like sem_post(), where gdk_threads_init() sets the value of the semaphore to 1. With this assumption I've used gdk_threads_enter/leave throughout my app and it definitely works. I'm guessing there is some sort of conflict between the key-press-event for the top level GtkWindow and my xlib key grabbing, but I don't know how to debug the situation further. Any ideas whats going on? thanks, Vikram. PS: GTK docs are much better than X11 docs :)I assume you've looked at accelerator groups and accelerator maps then, what don't they do?
By "global" I meant from any keyboard on a particular X Display. ie, my gtk application will not be the focus of input.
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