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Tk_CreateGenericHandler(3)   Tk Library Procedures  Tk_CreateGenericHandler(3)


       Tk_CreateGenericHandler,	 Tk_DeleteGenericHandler - associate procedure
       callback with all X events

       #include <tk.h>

       Tk_CreateGenericHandler(proc, clientData)

       Tk_DeleteGenericHandler(proc, clientData)

       Tk_GenericProc	*proc	     (in)      Procedure  to  invoke  whenever
					       any  X event occurs on any dis‐

       ClientData	clientData   (in)      Arbitrary  one-word  value   to
					       pass to proc.

       Tk_CreateGenericHandler	arranges  for proc to be invoked in the future
       whenever any X event occurs.  This mechanism is not intended  for  dis‐
       patching	 X  events  on	windows	 managed by Tk (you should use Tk_Cre‐
       ateEventHandler for this purpose).  Tk_CreateGenericHandler is intended
       for other purposes, such as tracing X events, monitoring events on win‐
       dows not owned by Tk, accessing X-related libraries that were not orig‐
       inally designed for use with Tk, and so on.

       The  callback  to  proc	will be made by Tk_HandleEvent; this mechanism
       only works in programs that dispatch events through Tk_HandleEvent  (or
       through	 other	 Tk  procedures	 that  call  Tk_HandleEvent,  such  as
       Tk_DoOneEvent or Tk_MainLoop).

       Proc should have arguments and result that  match  the  type  Tk_Gener‐
	      typedef int Tk_GenericProc(
		ClientData clientData,
		XEvent *eventPtr);
       The  clientData	parameter to proc is a copy of the clientData argument
       given to Tk_CreateGenericHandler when the callback was created.	 Typi‐
       cally,  clientData  points  to a data structure containing application-
       specific information about how to handle events.	 EventPtr is a pointer
       to the X event.

       Whenever	 an  X	event  is processed by Tk_HandleEvent, proc is called.
       The return value from proc is normally  0.   A  non-zero	 return	 value
       indicates  that	the  event is not to be handled further; that is, proc
       has done all processing that is to be allowed for the event.

       If there are multiple generic event handlers, each one  is  called  for
       each event, in the order in which they were established.

       Tk_DeleteGenericHandler	may  be	 called to delete a previously-created
       generic event handler:  it deletes each handler it finds	 that  matches
       the  proc  and  clientData  arguments.  If no such handler exists, then
       Tk_DeleteGenericHandler returns without doing  anything.	  Although  Tk
       supports	 it,  it's  probably a bad idea to have more than one callback
       with the same proc and clientData arguments.

       Establishing a generic event handler does nothing to  ensure  that  the
       process	will  actually	receive the X events that the handler wants to
       process.	 For example, it is the caller's responsibility to invoke XSe‐
       lectInput to select the desired events, if that is necessary.

       bind, callback, event, handler

Tk						    Tk_CreateGenericHandler(3)

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