|Tk_HandleEvent(3)||Tk Library Procedures||Tk_HandleEvent(3)|
Tk_HandleEvent - invoke event handlers for window system events
#include <tk.h> Tk_HandleEvent(eventPtr)
- 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 anything else.
callback, event, handler, window