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CentOS 7.0 - man page for xtappaddactionhook (centos section 3)

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XtAppAddActionHook(3)			   XT FUNCTIONS 		    XtAppAddActionHook(3)

       XtAppAddActionHook, XtRemoveActionHook - register an action hook procedure

       XtActionHookId XtAppAddActionHook(XtAppContext app_context, XtActionHookProc proc,
	      XtPointer client_data);

       void XtRemoveActionHook(XtActionHookId id);

		 Specifies the application context.

       proc	 Specifies the action hook procedure.

       num_args  Specifies the application-specific data to be passed to the action hook.

       XtAppAddActionHook adds the specified procedure to the front of a list maintained in the
       application context. In the future, when an action routine is about to be invoked for any
       widget in this application context, either through the translation manager or via
       XtCallActionProc, the action hohok procedures will be called in reverse order of registra-
       tion jut prior to invoking the action routine.

       Action hook procedures are removed automatically and the XtActionHookId s destroyed when
       the application context in which they were added is destroyed.

       XtRemoveActionHook removes the specified action hook procedure from the list in which it
       was registered.

       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11				   libXt 1.1.4			    XtAppAddActionHook(3)
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