TkCreateClientMessageHandler(T3k)Library ProceduTrkesCreateClientMessageHandler(3)

NAME
       TkCreateClientMessageHandler,  TkDeleteClientMessageHandler  -  asso-
       ciate procedure callback with ClientMessage type X events

SYNOPSIS
       ##iinncclluuddee <>

       TTkkCCrreeaatteeCClliieennttMMeessssaaggeeHHaannddlleerr(proc)

       TTkkDDeelleetteeCClliieennttMMeessssaaggeeHHaannddlleerr(proc)

AARRGGUUMMEENNTTSS
       TkClientMessageProc            *proc(in) Procedure to invoke  whenever
                                                 a   ClientMessage   X   event
                                                 occurs on any display.



DESCRIPTION
       TTkkCCrreeaatteeCClliieennttMMeessssaaggeeHHaannddlleerr arranges for proc to be  invoked  in  the
       future  whenever  a  ClientMessage X event occurs that isn't handled by
       WWMMPPRROOTTOOCCOOLL.  TTkkCCrreeaatteeCClliieennttMMeessssaaggeeHHaannddlleerr  is  intended  for  use  by
       applications  which  need to watch X ClientMessage events, such as drag
       and drop applications.

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

       Proc should have arguments and result that match the type TTkkCClliieennttMMeess-
       ssaaggeePPrroocc:
              typedef int TkClientMessageProc(
                TkWindow tkwin,
                XEvent *eventPtr);
       The tkwin parameter to proc is the Tk window which is  associated  with
       this event.  EventPtr is a pointer to the X event.

       Whenever  an  X ClientMessage event is processed by TTkkHHaannddlleeEEvveenntt, the
       proc is called if it wasn't handled as a WWMMPPRROOTTOOCCOOLL.  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 process-
       ing that is to be allowed for the event.

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

       TTkkDDeelleetteeCClliieennttMMeessssaaggeeHHaannddlleerr may be called to delete a previously-cre-
       ated ClientMessage event handler: it deletes each handler it finds that
       matches the proc argument.  If no such handler exists, then  TTkkDDeelleettee-
       CClliieennttMMeessssaaggeeHHaannddlleerr  returns without doing anything.  Although Tk sup-
       ports it, it's probably a bad idea to have more than one callback  with
       the same proc argument.


KKEEYYWWOORRDDSS
       bind, callback, event, handler



Tk                                    8.4     TkCreateClientMessageHandler(3)