/******************************************************************************* * Copyright (c) 2000, 2004 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.ole.win32;import org.eclipse.swt.internal.ole.win32.*;import org.eclipse.swt.*;final class OlePropertyChangeSink {	private OleControlSite controlSite;	//private IUnknown objIUnknown;		private COMObject iUnknown;	private COMObject iPropertyNotifySink;	private int refCount;		private int propertyCookie;	private OleEventTable eventTable;	OlePropertyChangeSink(OleControlSite controlSite) {		this.controlSite = controlSite;		createCOMInterfaces();}void addListener(int propertyID, OleListener listener) {	if (listener == null) OLE.error (SWT.ERROR_NULL_ARGUMENT);	if (eventTable == null) eventTable = new OleEventTable ();	eventTable.hook(propertyID, listener);}int AddRef() {	refCount++;	return refCount;}void connect(IUnknown objIUnknown) {	// Set up property change notification sink	int[] ppvObject = new int[1];	if (objIUnknown.QueryInterface(COM.IIDIConnectionPointContainer, ppvObject) == COM.S_OK) {		IConnectionPointContainer cpc = new IConnectionPointContainer(ppvObject[0]);		if (cpc.FindConnectionPoint(COM.IIDIPropertyNotifySink, ppvObject) == COM.S_OK) {			IConnectionPoint cp = new IConnectionPoint(ppvObject[0]);			int[] cookie = new int[1];			if (cp.Advise(iPropertyNotifySink.getAddress(), cookie) == COM.S_OK) {				propertyCookie = cookie[0];			}			cp.Release();		}		cpc.Release();	}}private void createCOMInterfaces() {	// register each of the interfaces that this object implements	iUnknown = new COMObject(new int[]{2, 0, 0}){		public int method0(int[] args) {return QueryInterface(args[0], args[1]);}		public int method1(int[] args) {return AddRef();}		public int method2(int[] args) {return Release();}	};		iPropertyNotifySink = new COMObject(new int[]{2, 0, 0, 1, 1}){		public int method0(int[] args) {return QueryInterface(args[0], args[1]);}		public int method1(int[] args) {return AddRef();}		public int method2(int[] args) {return Release();}		public int method3(int[] args) {return OnChanged(args[0]);}		public int method4(int[] args) {return OnRequestEdit(args[0]);}	};}void disconnect(IUnknown objIUnknown) {	// disconnect property notification sink	if (propertyCookie != 0 && objIUnknown != null) {		int[] ppvObject = new int[1];		if (objIUnknown.QueryInterface(COM.IIDIConnectionPointContainer, ppvObject) == COM.S_OK) {			IConnectionPointContainer cpc = new IConnectionPointContainer(ppvObject[0]);			if (cpc.FindConnectionPoint(COM.IIDIPropertyNotifySink, ppvObject) == COM.S_OK) {				IConnectionPoint cp = new IConnectionPoint(ppvObject[0]);				if (cp.Unadvise(propertyCookie) == COM.S_OK) {					propertyCookie = 0;				}				cp.Release();			}			cpc.Release();		}	}}private void disposeCOMInterfaces() {	if (iUnknown != null)		iUnknown.dispose();	iUnknown = null;	if (iPropertyNotifySink != null)		iPropertyNotifySink.dispose();	iPropertyNotifySink = null;	}/*** Notify listeners of an event.* <p>*	This method notifies all listeners that an event* has occurred.** @param eventType the desired SWT event* @param event the event data** @exception SWTError <ul>*		<li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li>*		<li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li>* 		<li>ERROR_NULL_ARGUMENT when handler is null</li>*	</ul>*/private void notifyListener (int eventType, OleEvent event) {	if (event == null) OLE.error (SWT.ERROR_NULL_ARGUMENT);	if (eventTable == null) return;	event.type = eventType;	event.widget = controlSite;	eventTable.sendEvent (event);}private int OnChanged(int dispID) {	if (eventTable == null || !eventTable.hooks(dispID)) return COM.S_OK;		OleEvent event = new OleEvent();	event.detail = OLE.PROPERTY_CHANGED;	try {		notifyListener(dispID,event);	} catch (Throwable e) {	}		return COM.S_OK;}private int OnRequestEdit(int dispID) {	if (eventTable == null || !eventTable.hooks(dispID)) return COM.S_OK;		OleEvent event = new OleEvent();	event.doit = true;	event.detail = OLE.PROPERTY_CHANGING;		try {		notifyListener(dispID,event);	} catch (Throwable e) {	}		if (event.doit) return COM.S_OK;	return COM.S_FALSE;}private int QueryInterface(int riid, int ppvObject) {	if (riid == 0 || ppvObject == 0)		return COM.E_INVALIDARG;	GUID guid = new GUID();	COM.MoveMemory(guid, riid, GUID.sizeof);	if (COM.IsEqualGUID(guid, COM.IIDIUnknown)) {		COM.MoveMemory(ppvObject, new int[] {iUnknown.getAddress()}, 4);		AddRef();		return COM.S_OK;	}	if (COM.IsEqualGUID(guid, COM.IIDIPropertyNotifySink)) {		COM.MoveMemory(ppvObject, new int[] {iPropertyNotifySink.getAddress()}, 4);		AddRef();		return COM.S_OK;	}	COM.MoveMemory(ppvObject, new int[] {0}, 4);	return COM.E_NOINTERFACE;}int Release() {	refCount--;	if (refCount == 0) {		disposeCOMInterfaces();	}		return refCount;}void removeListener(int propertyID, OleListener listener) {	if (listener == null) OLE.error (SWT.ERROR_NULL_ARGUMENT);	if (eventTable == null) return;	eventTable.unhook (propertyID, listener);}}