CentOS 7.0 - man page for tk_createclientmessagehandler (centos section 3)
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Tk_CreateClientMessageHandler(3) Tk Library Procedures Tk_CreateClientMessageHandler(3)
Tk_CreateClientMessageHandler, Tk_DeleteClientMessageHandler - associate procedure call-
back with ClientMessage type X events
Tk_ClientMessageProc *proc (in) Procedure to invoke whenever a ClientMessage X
event occurs on any display.
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_CreateClientMessage-
Handler 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 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_ClientMessageProc:
typedef int Tk_ClientMessageProc(
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 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 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 handler: 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.
bind, callback, event, handler
Tk 8.4 Tk_CreateClientMessageHandler(3)
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