dwm/transient.c

/* cc transient.c -o transient -lX11 */

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdlib.h>
#include <unistd.h>

int
main(void)
{
    Display* d;
    Window r, f, t = None;
    XSizeHints h;
    XEvent e;

    d = XOpenDisplay(NULL);
    if (!d)
        exit(1);
    r = DefaultRootWindow(d);

    f = XCreateSimpleWindow(d, r, 100, 100, 400, 400, 0, 0, 0);
    h.min_width = h.max_width = h.min_height = h.max_height = 400;
    h.flags = PMinSize | PMaxSize;
    XSetWMNormalHints(d, f, &h);
    XStoreName(d, f, "floating");
    XMapWindow(d, f);

    XSelectInput(d, f, ExposureMask);
    while (1) {
        XNextEvent(d, &e);

        if (t == None) {
            sleep(5);
            t = XCreateSimpleWindow(d, r, 50, 50, 100, 100, 0, 0, 0);
            XSetTransientForHint(d, t, f);
            XStoreName(d, t, "transient");
            XMapWindow(d, t);
            XSelectInput(d, t, ExposureMask);
        }
    }

    XCloseDisplay(d);
    exit(0);
}