/******************************************************************************* * Copyright (c) 2000, 2003 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.custom;import org.eclipse.swt.internal.SWTEventListener;/** * The StyledText widget implements this listener to receive * notifications when changes to the model occur. * It is not intended to be implemented by clients or by  * implementors of StyledTextContent.  * Clients should listen to the ModifyEvent or ExtendedModifyEvent  * that is sent by the StyledText widget to receive text change  * notifications. * Implementors of StyledTextContent should call the textChanging * and textChanged methods when text changes occur as described  * below. If the entire text is replaced the textSet method  * should be called instead. */public interface TextChangeListener extends SWTEventListener {/** * This method is called when the content is about to be changed. * Callers also need to call the textChanged method after the  * content change has been applied. The widget only updates the  * screen properly when it receives both events.  *  * @param event the text changing event. All event fields need * 	to be set by the sender. * @see TextChangingEvent */public void textChanging(TextChangingEvent event);/** * This method is called when the content has changed. * Callers need to have called the textChanging method prior to  * applying the content change and calling this method. The widget  * only updates the screen properly when it receives both events. *  * @param event the text changed event */public void textChanged(TextChangedEvent event);/** * This method is called instead of the textChanging/textChanged  * combination when the entire old content has been replaced  * (e.g., by a call to StyledTextContent.setText()). *  * @param event the text changed event */public void textSet(TextChangedEvent event);}