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Manual pages › X Window and screen libraries (3X)

XtAddCbk(3X)

add and remove callback procedures

From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.

NAME

XtAddCallback, XtAddCallbacks, XtRemoveCallback, XtRemove-Callbacks, XtRemoveAllCallbacks - add and remove callback procedures

SYNTAX

void XtAddCallback(w, callback_name, callback, client_data)
      Widget w;
      String callback_name;
      XtCallbackProc callback;
      caddr_t client_data;

void XtAddCallbacks(w, callback_name, callbacks)
      Widget w;
      String callback_name;
      XtCallbackList callbacks;

void XtRemoveCallback(w, callback_name, callback,
client_data)
      Widget w;
      String callback_name;
      XtCallbackProc callback;
      caddr_t client_data;

void XtRemoveCallbacks(w, callback_name, callbacks)
      Widget w;
      String callback_name;
      XtCallbackList callbacks;

void XtRemoveAllCallbacks(w, callback_name)
      Widget w;
      String callback_name;

ARGUMENTS

callback  Specifies the callback procedure.

callbacks Specifies the null-terminated list of callback
          procedures and corresponding client data.

callback_name

Specifies the callback list to which the procedure is to be appended or deleted.

client_data

Specifies the argument that is to be passed to the specified procedure when it is invoked by XtCallbacks or NULL, or the client data to match on the registered callback procedures.

     w         Specifies the widget.

XWIN 3.0               Last change: 9/1/88                 .ie t

DESCRIPTION

The XtAddCallback function adds the specified callback procedure to the specified widget's callback list.

The XtAddCallbacks add the specified list of callbacks to
the specified widget's callback list.

The XtRemoveCallback function removes a callback only if
both the procedure and the client data match.

The XtRemoveCallbacks function removes the specified callback procedures from the specified widget's callback list.

The XtRemoveAllCallbacks function removes all the callback procedures from the specified widget's callback list.

SEE ALSO

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

XWIN 3.0               Last change: 9/1/88                 .ie t

XWIN 3.0               Last change: 9/1/88                 .ie t