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Tk_CreateClientMessageHandler(3)            Tk Library Procedures           Tk_CreateClientMessageHandler(3)



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NAME
       Tk_CreateClientMessageHandler,  Tk_DeleteClientMessageHandler  -  associate  procedure  callback with
       ClientMessage type X events

SYNOPSIS
       #include <tk.h>

       Tk_CreateClientMessageHandler(proc)

       Tk_DeleteClientMessageHandler(proc)

ARGUMENTS
       Tk_ClientMessageProc *proc (in)           Procedure to invoke whenever a ClientMessage X event occurs
                                                 on any display.
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DESCRIPTION
       Tk_CreateClientMessageHandler  arranges for proc to be invoked in the future whenever a ClientMessage
       X event occurs that is not handled by WM_PROTOCOL.  Tk_CreateClientMessageHandler 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 Tk_HandleEvent; this mechanism only works in programs that dis-patch dispatch
       patch 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_ClientMessageProc:
              typedef int Tk_ClientMessageProc(
                  Tk_Window 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 Tk_HandleEvent, the proc is called if  it  was  not
       handled  as  a WM_PROTOCOL.  The return value from proc is normally 0.  A non-zero return value indi-cates indicates
       cates 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 ClientMessage event handlers, each one is called for each event, in the order
       in which they were established.

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


KEYWORDS
       bind, callback, event, handler



Tk                                                   8.4                    Tk_CreateClientMessageHandler(3)