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// gcc -o wm_take_focus wm_take_focus.c -lX11
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
Display *display;
int screen_num;
Window root;
Atom XA_WM_TAKE_FOCUS;
Window create_window(char * name, Window parent, int x, int y, int width, int height)
{
XSizeHints sh;
XWMHints wmh;
Window win = XCreateSimpleWindow(display, parent, x, y, width, height,
2, // border width
BlackPixel(display, screen_num),
WhitePixel(display, screen_num));
XStoreName(display, win, name);
XSelectInput(display, win, FocusChangeMask | ButtonPressMask | ButtonReleaseMask );
sh.width = width;
sh.height = height;
sh.x = x;
sh.y = y;
sh.flags = USPosition | USSize;
XSetWMNormalHints(display, win, &sh);
wmh.input = False;
wmh.flags = InputHint;
XSetWMHints(display, win, &wmh);
Atom protocols[1];
protocols[0] = XA_WM_TAKE_FOCUS = XInternAtom (display, "WM_TAKE_FOCUS", True);
XSetWMProtocols (display, win, protocols, 1);
return win;
}
int main(int argc, char **argv)
{
Window window, win;
XEvent ev;
char *display_name = NULL;
if ((display = XOpenDisplay(display_name)) == NULL)
{
fprintf(stderr, "Couldn't open %s\n", XDisplayName(display_name));
return -1;
}
screen_num = DefaultScreen(display);
root = RootWindow(display, screen_num);
window = create_window("TestFrame", root, 100, 100, 200, 100);
XMapWindow(display, window);
XFlush(display);
XSync(display, False);
while (1)
{
XNextEvent(display, &ev);
int i = 0;
for (i = 0; i < 2; i++) {
win = ev.xany.window;
if (win == window) {
fprintf(stderr, "event on frame %i: ", i);
switch(ev.xany.type) {
case ClientMessage:
fprintf(stderr, "ClientMessage\n");
if (ev.xclient.data.l[0] == XA_WM_TAKE_FOCUS) {
fprintf(stderr, " WM_TAKE_FOCUS\n");
XSetInputFocus(display, win, RevertToPointerRoot, CurrentTime);
}
break;
case FocusIn:
fprintf(stderr, "FocusIn\n");
break;
case FocusOut:
fprintf(stderr, "FocusOut\n");
break;
default:
fprintf(stderr, "%d\n", ev.xany.type);
}
}
}
}
return 0;
}
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