I'm trying to get the current keyboard modifiers state through gnome GDK or GTK library in aim to implement an accessibility gnome shell extension that shows that state.
I know how to get thier state using xlib, but there is not full binding for gnome gjs.
The code below get only the initial state. It does not update state.
/*
* compiling: gcc `pkg-config --cflags gdk-3.0` -o gdk_mod gdk_mod.c `pkg-config --libs gdk-3.0`
*/
#include <gdk/gdk.h>
int main (int argc, char **argv) {
gdk_init(&argc, &argv);
GdkDisplay * disp;
disp = gdk_display_open(NULL);
if (disp!=NULL) g_printf("display connected!\n");
GdkKeymap * kmap;
kmap = gdk_keymap_get_for_display(disp);
guint state;
state = gdk_keymap_get_modifier_state(kmap);
g_printf("mod state: %x\n", state);
while (1) {
g_usleep(1000000);
//kmap = gdk_keymap_get_for_display(disp);
state = gdk_keymap_get_modifier_state(kmap);
g_printf("mod state: %x\n", state);
}
}
Here an example output with CAPS lock active then inactive but no change:
$ ./gdk_mod
display found!
mod state: 2
mod state: 2
mod state: 2
mod state: 2
mod state: 2
^C
Currently using Kubuntu 15.04.
What's wrong with my code?