XtDispatchEventToWidget man page on BSDOS

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XtInsertEventTypeHandler(3XXT FUNCTIXtInsertEventTypeHandler(3Xt)

NAME
       XtInsertEventTypeHandler, XtRemoveEventTypeHandler, XtReg-
       isterExtensionSelector, XtSetEventDispatcher, XtDispatch-
       EventToWidget - extension event handling

SYNTAX
       void XtInsertEventTypeHandler(widget, event_type,
       select_data, proc, client_data, position)
	     Widget wdget;
	     int event_type;
	     XtPointer select_data;
	     XtEventHandler proc;
	     XtPointer client_data;
	     XtListPosition position;

       void XtRemoveEventTypeHandler(widget, event_type,
       select_data, proc, client_data)
	     Widget wdget;
	     int event_type;
	     XtPointer select_data;
	     XtEventHandler proc;
	     XtPointer client_data;

       void XtRegisterExtensionSelector(display, min_event_type,
       max_event_type, proc, client_data)
	     Display* display;
	     int min_event_type;
	     int max_event_type;
	     XtExtensionSelectProc proc;
	     XtPointer client_data;

       XtEventDispatchProc XtSetEventDispatcher(display,
       event_type, proc)
	     Widget widget;
	     int event_type;
	     XtEventDispatchProc proc;

       Boolean XtDispatchEventToWidget(widget, event)
	     Widget widget;
	     XEvent* event;

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.

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XtInsertEventTypeHandler(3XXT FUNCTIXtInsertEventTypeHandler(3Xt)

       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 han-
		 dlers.

       display	Specifies the display.

       min_event_type, max_event_type
		 Specifies the range of event types for this
		 extension.

       event	Specifies a pointer to the event to be dis-
		 patched.

DESCRIPTION
       The XtInsertEventTypeHandler function registeres a proce-
       dure with the dispatch mechanism that is to be called when
       an event that matches the specified event_type is dis-
       patched 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 XtInsertRawEventHandler 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 selector registered for the spec-
       ified 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 regis-
       ters this event handler after any previously registered
       handlers for this event type.

       The XtRemoveEventTypeHandler function unregisters an even
       handler registered with XtInsertEventTypeHandler for the
       specified event type. The request is ignored if
       client_data does not match the value given with the

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XtInsertEventTypeHandler(3XXT FUNCTIXtInsertEventTypeHandler(3Xt)

       handler was registered.

       If event_type specifies on of the core X protocol events,
       select_data must be a pointer to a value of type
       EventMask, indicating the mask to be used to deselect for
       the appropriate event.  If the widget is realized,
       XtRemoveEventTypeHandler calls XSelectInput if necessary.
       Specifying NULL for select_data is equivalent to specify-
       ing a pointer to an event mask containing 0. This is simi-
       lar to the XtRemoveRawEventHandler 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 selector registered for the spec-
       ified event type.

       The XtRegisterExtensionSelector function registers a pro-
       cedure to arrange for the delivery of extension events to
       widgets.

       If min_event_type and max_event_type match the parameters
       to a previous call to XtRegisterExtensionSelector for the
       same display, the proc and client_data replace the previ-
       ously registered values. If the range specified by
       min_event_type and max_event_type overlaps the range of
       the parameters to a previous call for the same display in
       any other way, an error results.

       The XtSetEventDispatcher function registes the event dis-
       patcher procedure specified by proc for event swith the
       type event_type. The previously registered dispatcher (or
       the default dispatcher if there was no previousl regis-
       tered dispatcher) is returned. If proc is NULL, the
       default procedure is restored for the specified type.

       In the future, when XtDispatchEvent is called with an
       event of event_type, the specified proc (or the default
       dispatcher) will be invoked to determine a widget ot which
       to dispatch the event.

       The XtDispatchEventToWidget function scans the list of
       registered event handlers for the specified widget and
       calls each handler that has been registered for the speci-
       fied event type, subject to the continue_to_dispatch value
       returned by each handler. The Intrinsics behave as if
       event handlers were registered at the head of the list for
       Expose, NoExpose, GraphicsExpose, and VisibilityNotify
       events to invoke the widget's expose procedure according
       to the exposure compression rules and to update the wid-
       get's visible field if visible_interest is True. These
       internal event handlers never set continue_to_dispatch to
       False.

       XtDispatchEventToWidget returns True if any event handler

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XtInsertEventTypeHandler(3XXT FUNCTIXtInsertEventTypeHandler(3Xt)

       was called and False otherwise.

SEE ALSO
       XtGetKeyboardFocusWidget(3Xt)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11		Release 6.4				4

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