FreeBSD Manual Pages
Tk_HandleEvent(3) Tk Library Procedures Tk_HandleEvent(3) ______________________________________________________________________________ NAME Tk_HandleEvent - invoke event handlers for window system events SYNOPSIS #include <tk.h> Tk_HandleEvent(eventPtr) ARGUMENTS XEvent *eventPtr (in) Pointer to X event to dispatch to rele- vant handler(s). It is important that all unused fields of the structure be set to zero. ______________________________________________________________________________ DESCRIPTION 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 call- backs to any window event handlers (created by calls to Tk_CreateEven- tHandler) 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_Han- dleEvent. 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 any- thing else. KEYWORDS callback, event, handler, window Tk Tk_HandleEvent(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | KEYWORDS
Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=Tk_HandleEvent.tk85&sektion=3&manpath=FreeBSD+12.2-RELEASE+and+Ports>