XtCallCallbacks
Section: XT FUNCTIONS (3)
Updated: libXt 1.0.7
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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