MirOS Manual: XtCallCallbackList(3), XtCallCallbacks(3), XtHasCallbacks(3)


XtCallCallbacks(3Xt)      XT FUNCTIONS       XtCallCallbacks(3Xt)

NAME

     XtCallCallbacks, XtCallCallbackList, XtHasCallbacks - pro-
     cess callbacks

SYNTAX

     void XtCallCallbacks(Widget w, String callback_name,
          XtPointer call_data);

     void XtCallCallbackList(Widget w, XtCallbackList callbacks,
          XtPointer call_data);

     typedef enum {XtCallbackNoList, XtCallbackHasNone,
     XtCallbackHasSome} XtCallbackStatus;

     XtCallbackStatus XtHasCallbacks(Widget w, String
          callback_name);

ARGUMENTS

     callback_name
               Specifies the callback list to be executed or
               checked.

     call_data Specifies a callback-list specific data value to
               pass to each of the callback procedure in the
               list.

     callbacks Specifies the callback list to be executed.

     w         Specifies the widget.

DESCRIPTION

     The XtCallCallbacks function calls each procedure that is
     registered in the specified widget's callback list.

     If callbacks is not NULL, XtCallCallbackList calls each of
     the callback procedures in the list, passing client data and
     call_data. The callbacks parameter must specify the contents
     of a widget or object resource declared with representation
     type XtRCallback.

     The XtHasCallbacks function first checks to see if the wid-
     get has a callback list identified by callback_name. If the
     callback list does not exist, XtHasCallbacks returns
     XtCallbackNoList. If the callback list exists but is empty,
     it returns XtCallbackHasNone. If the callback list exists
     and has at least one callback registered, it returns
     XtCallbackHasSome.

SEE ALSO

     XtAddCallback(3Xt)
     X Toolkit Intrinsics - C Language Interface
     Xlib - C Language X Interface

XFree86                   Version 4.5.0                         1

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