NAME

XtHasCallbacks − determine the status of a widget’s callback list. 

Synopsis

XtCallbackStatus XtHasCallbacks(object, callback_name)

    Widget object;
    String callback_name;

Inputs

objectSpecifies the object; may be of class Object or any subclass thereof. 

callback_name
Specifies the callback list to be checked.

Returns

An XtCallbackStatus value. 

Description

XtHasCallbacks() checks the widget for a resource named callback_name.  If the resource does not exist or is not of type XtRCallback, XtHasCallbacks() returns XtCallbackNoList.  If the callback list exists but is empty, it returns XtCallbackHasNone.  If the callback list contains at least one callback procedure, it returns XtCallbackHasSome. 

Structures

typedef enum {
XtCallbackNoList,
XtCallbackHasNone,
XtCallbackHasSome
} XtCallbackStatus;

See Also

XtAddCallbacks(1), XtCallCallbacks(1), XtCallCallbackList(1). 

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