/* * Copyright (c) 2000 David Flanagan.  All rights reserved. * This code is from the book Java Examples in a Nutshell, 2nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book (recommended), * visit http://www.davidflanagan.com/javaexamples2. */package com.davidflanagan.examples.beans;import java.beans.*;import java.awt.*;import java.awt.event.*;/** * This class is a custom editor for the messageText property of the * YesNoPanel bean.  It is necessary because the default editor for * properties of type String does not allow multi-line strings * to be entered. */public class YesNoPanelMessageEditor implements PropertyEditor {    protected String value;  // The value we will be editing.        public void setValue(Object o) {  value = (String) o; }    public Object getValue() { return value; }    public void setAsText(String s) { value = s; }    public String getAsText() { return value; }    public String[] getTags() { return null; }  // not enumerated; no tags        // Say that we allow custom editing.    public boolean supportsCustomEditor() { return true; }        // Return the custom editor.  This just creates and returns a TextArea    // to edit the multi-line text.  But it also registers a listener on the    // text area to update the value as the user types and to fire the    // property change events that property editors are required to fire.    public Component getCustomEditor() {	final TextArea t = new TextArea(value);	t.setSize(300, 150); // TextArea has no preferred size, so set one	t.addTextListener(new TextListener() {		public void textValueChanged(TextEvent e) {		    value = t.getText();		    listeners.firePropertyChange(null, null, null);		}	    });	return t;    }        // Visual display of the value, for use with the custom editor.    // Just print some instructions and hope they fit in the in the box.    // This could be more sophisticated.    public boolean isPaintable() { return true; }    public void paintValue(Graphics g, Rectangle r) {	g.setClip(r);	g.drawString("Click to edit...", r.x+5, r.y+15);    }        // Important method for code generators.  Note that it really ought to    // escape any quotes or backslashes in value before returning the string.    public String getJavaInitializationString() { return "\"" + value + "\""; }        // This code uses the PropertyChangeSupport class to maintain a list of    // listeners interested in the edits we make to the value.    protected PropertyChangeSupport listeners =new PropertyChangeSupport(this);    public void addPropertyChangeListener(PropertyChangeListener l) {	listeners.addPropertyChangeListener(l);    }    public void removePropertyChangeListener(PropertyChangeListener l) {	listeners.removePropertyChangeListener(l);    }}