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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.commons.ui.swing.delegate;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import org.databene.commons.BeanUtil;
import org.databene.commons.StringUtil;
import org.databene.commons.bean.ObservableBean;
import org.databene.commons.converter.ToStringConverter;
/**
* {@link JTextField} implementation that serves as delegate of a property of a JavaBean object.
* Created at 17.07.2008 14:38:14
* @since 0.5.13
* @author Volker Bergmann
*/
public class PropertyTextField extends JTextField {
/** uid for serialization */
private static final long serialVersionUID = -6986676080916477887L;
// attributes ------------------------------------------------------------------------------------------------------
private Object bean;
private String propertyName;
private ToStringConverter toStringConverter;
boolean locked;
// constructor -----------------------------------------------------------------------------------------------------
public PropertyTextField(Object bean, String propertyName, int length) {
super(length);
this.bean = bean;
this.propertyName = propertyName;
this.toStringConverter = new ToStringConverter();
this.locked = true;
Listener listener = new Listener();
if (bean instanceof ObservableBean)
((ObservableBean) bean).addPropertyChangeListener(propertyName, listener);
this.getDocument().addDocumentListener(listener);
this.locked = false;
refresh();
}
// event handlers --------------------------------------------------------------------------------------------------
/**
* reads the current property value and writes it to the text field.
*/
void refresh() {
if (!locked) {
locked = true;
Object propertyValue = BeanUtil.getPropertyValue(bean, propertyName);
String text = toStringConverter.convert(propertyValue);
text = StringUtil.escape(text);
if (!getText().equals(text))
setText(text);
locked = false;
}
}
/**
* writes the current text field content to the property.
*/
void update() {
if (!locked) {
locked = true;
Document document = getDocument();
String text;
try {
text = document.getText(0, document.getLength());
} catch (BadLocationException e) {
throw new RuntimeException(e);
}
text = StringUtil.unescape(text);
if (!text.equals(BeanUtil.getPropertyValue(bean, propertyName)))
BeanUtil.setPropertyValue(bean, propertyName, text);
locked = false;
}
}
class Listener implements PropertyChangeListener, DocumentListener {
@Override
public void propertyChange(PropertyChangeEvent evt) {
refresh();
}
@Override
public void changedUpdate(DocumentEvent evt) {
update();
}
@Override
public void insertUpdate(DocumentEvent evt) {
update();
}
@Override
public void removeUpdate(DocumentEvent evt) {
update();
}
}
}