transient.c

   1 /* cc transient.c -o transient -lX11 */
   2
   3 #include <X11/Xlib.h>
   4 #include <X11/Xutil.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7
   8 int main(void) {
   9         Display *d;
  10         Window r, f, t = None;
  11         XSizeHints h;
  12         XEvent e;
  13
  14         d = XOpenDisplay(NULL);
  15         if (!d) {
  16                 exit(1);
  17   }
  18         r = DefaultRootWindow(d);
  19
  20         f = XCreateSimpleWindow(d, r, 100, 100, 400, 400, 0, 0, 0);
  21         h.min_width = h.max_width = h.min_height = h.max_height = 400;
  22         h.flags = PMinSize | PMaxSize;
  23         XSetWMNormalHints(d, f, &h);
  24         XStoreName(d, f, "floating");
  25         XMapWindow(d, f);
  26
  27         XSelectInput(d, f, ExposureMask);
  28         while (1) {
  29                 XNextEvent(d, &e);
  30
  31                 if (t == None) {
  32                         sleep(5);
  33                         t = XCreateSimpleWindow(d, r, 50, 50, 100, 100, 0, 0, 0);
  34                         XSetTransientForHint(d, t, f);
  35                         XStoreName(d, t, "transient");
  36                         XMapWindow(d, t);
  37                         XSelectInput(d, t, ExposureMask);
  38                 }
  39         }
  40
  41         XCloseDisplay(d);
  42         exit(0);
  43 }