NAME
XtCallCallbacks, XtCallCallbackList, XtHasCallbacks - process 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 widget 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(3)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface