XtAppAddActionHook, XtRemoveActionHook - register an action hook procedure
XtAppAddActionHook(app_context, proc, client_data)
Specifies the application context.
Specifies the action hook procedure.
Specifies the application-specific data to be passed to the
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 hook procedures will be called in reverse order of registration just prior to invoking the action routine.
Action hook procedures are removed automatically and the XtActionHookId is destroyed when the application context in which they were added is destroyed.
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