void hookEvents() {
super.hookEvents();
if ((style & SWT.SEPARATOR) != 0) return;
int windowProc = display.windowProc;
OS.XtAddEventHandler(handle, OS.KeyPressMask, false, windowProc, KEY_PRESS);
OS.XtAddEventHandler(handle, OS.KeyReleaseMask, false, windowProc, KEY_RELEASE);
OS.XtAddEventHandler(handle, OS.ButtonPressMask, false, windowProc, BUTTON_PRESS);
OS.XtAddEventHandler(handle, OS.ButtonReleaseMask, false, windowProc, BUTTON_RELEASE);
OS.XtAddEventHandler(handle, OS.PointerMotionMask, false, windowProc, POINTER_MOTION);
OS.XtAddEventHandler(handle, OS.EnterWindowMask, false, windowProc, ENTER_WINDOW);
OS.XtAddEventHandler(handle, OS.LeaveWindowMask, false, windowProc, LEAVE_WINDOW);
OS.XtAddCallback(handle, OS.XmNexposeCallback, windowProc, EXPOSURE_CALLBACK);
OS.XtInsertEventHandler(
handle, OS.FocusChangeMask, false, windowProc, FOCUS_CHANGE, OS.XtListTail);
}
