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