Tk_HandleEvent - invoke event handlers for window system events
- XEvent *eventPtr (in)
- Pointer to X event to dispatch to relevant handler(s). It is important
that all unused fields of the structure be set to zero.
Tk_HandleEvent is a lower-level procedure that deals with window events.
It is called by Tcl_ServiceEvent (and indirectly by
Tcl_DoOneEvent), and in a few other cases within Tk. It makes callbacks
to any window event handlers (created by calls to
Tk_CreateEventHandler) that match eventPtr and then returns. In
some cases it may be useful for an application to bypass the Tk event queue
and call Tk_HandleEvent directly instead of calling
Tcl_QueueEvent followed by Tcl_ServiceEvent.
This procedure may be invoked recursively. For example, it is
possible to invoke Tk_HandleEvent recursively from a handler called
by Tk_HandleEvent. This sort of operation is useful in some modal
situations, such as when a notifier has been popped up and an application
wishes to wait for the user to click a button in the notifier before doing
callback, event, handler, window