/* * Routine to let user select a window using the mouse */Window Select_Window(dpy) Display *dpy;{ int status; Cursor cursor; XEvent event; Window target_win = None, root = RootWindow(dpy,screen); int buttons = 0; /* Make the target cursor */ cursor = XCreateFontCursor(dpy, XC_crosshair); /* Grab the pointer using target cursor, letting it room all over */ status = XGrabPointer(dpy, root, False, ButtonPressMask|ButtonReleaseMask, GrabModeSync, GrabModeAsync, root, cursor, CurrentTime); if (status != GrabSuccess) Fatal_Error("Can't grab the mouse."); /* Let the user select a window... */ while ((target_win == None) || (buttons != 0)) { /* allow one more event */ XAllowEvents(dpy, SyncPointer, CurrentTime); XWindowEvent(dpy, root, ButtonPressMask|ButtonReleaseMask, &event); switch (event.type) { case ButtonPress: if (target_win == None) { target_win = event.xbutton.subwindow; /* window selected */ if (target_win == None) target_win = root; } buttons++; break; case ButtonRelease: if (buttons > 0) /* there may have been some down before we started */ buttons--; break; } } XUngrabPointer(dpy, CurrentTime); /* Done with pointer */ return(target_win);}