XtInsertEventTypeHandler(3X) XT FUNCTIONS XtInsertEventTypeHandler(3X)NAMEXtInsertEventTypeHandler - extension event handling
SYNTAX
void XtInsertEventTypeHandler(widget, event_type, select_data, proc,
client_data, position)
Widget widget;
int event_type;
XtPointer select_data;
XtEventHandler proc;
XtPointer client_data;
XtListPosition position;
ARGUMENTS
widget Specifies the widget for this event handler. Must be of
class Core or any subclass thereof.
event_type
Specifies the event type.
select_data
Specifies data used to select or deselect events from the
server.
proc Specifies the proc.
client_data
Specifies additional data to be passed to the event handler.
position Specifies when the event handler is to be called relative to
other previously registered handlers.
DESCRIPTION
The XtInsertEventTypeHandler function registeres a procedure with the
dispatch mechanism that is to be called when an event that matches the
specified event_type is dispatched to the specified widget.
If event_type is one of the core X protocol events then select_data
must be a pointer to a value of type EventMask, indicating the event
mask to be used to select for the desired event. This event mask will
be included in the value returned by XtBuildEventMask. If the widget
is realized XtInsertEventTypeHandler calls XSelectInput if necessary.
Specifying NULL for select_data is equivalent to specifying a pointer
to an event mask containing 0. This is similar to the XtInsertRawEven‐
tHandler function.
If event_type specifies an extension event type then the semantics of
the data pointed to by select_data are defined by the extension selec‐
tor registered for the specified event type.
In either case the Intrinsics are not required to copy the data pointed
to by select_data, so the caller must ensure that it remains valid as
long as the event handler remains registered with this value of
select_data.
The position argument allows the client to control the order of the
invocation of event handlers registered for the same event type. If the
client does not care about the order, it should normally specify
XtListTail, which registers this event handler after any previously
registered handlers for this event type.
SEE ALSOXtEventHandlerProc(3X)XtGetKeyboardFocusWidget(3X), XtRemoveEventType‐
Handler(3X), XtRegisterExtensionSelector(3X), XtSetEventDispatcher(3X),
XtDispatchEventToWidget(3X)X Version 11 Release 6 XtInsertEventTypeHandler(3X)
