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From: Sun on 22 Jan 2010 10:38
Hi,
I have an overlay input-only window created as following:

....
screen = DefaultScreen(dpy);
width = DisplayWidth(dpy, screen);
height = DisplayHeight(dpy, screen);
root = RootWindow(dpy, screen);
vmask |= CWDontPropagate;
attrib.do_not_propagate_mask = KeyPressMask | KeyReleaseMask |
ButtonPressMask | ButtonReleaseMask;
window = XCreateWindow(dpy, root, 0, 0, width, height, 0,
CopyFromParent, InputOnly, CopyFromParent,
vmask, &attrib);

/* Put the wait cursor into the window */
XDefineCursor(dpy, window, 0);
....

Now, when this window is mapped and raised, the application's main
event loop still receives keypress and mouse events. When such event
occurs (For ex: F1 key press), the following function is called to
raise a window:

static void SendButtonEvent(Widget cascadebutton)
{
static XButtonEvent *ButtonEvent=NULL;

XSetInputFocus(UxDisplay,XtWindow
(UxTopLevel),RevertToPointerRoot,CurrentTime);
if (ButtonEvent)
{
free(ButtonEvent);
ButtonEvent = NULL;
}
ButtonEvent = (XButtonEvent *)malloc(sizeof
(XButtonEvent));
ButtonEvent->type = ButtonPress;
ButtonEvent->window = XtWindow(cascadebutton);
ButtonEvent->subwindow = XtWindow(cascadebutton);
ButtonEvent->state = 0;
ButtonEvent->button = Button1;
XSendEvent(XtDisplay(cascadebutton), XtWindow
(cascadebutton),
True, ButtonPressMask, (XEvent*) ButtonEvent);
ButtonEvent->type = ButtonRelease;
XSendEvent(XtDisplay(cascadebutton), XtWindow
(cascadebutton),
True, ButtonReleaseMask, (XEvent*)
ButtonEvent);
}

At this point the UI looks frozen. No more key events or buttons
events are processed by the main event loop.

My questions are:
1. Why does the main event loop continue to receive the key press
event when the overlay window is up?
2. When the overlay window is up and keypress event is generated, why
does the keyboard and mouse becomes inactive?

We are using X/Motif 1.2 and Solaris 2.6.
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