/*
* Beryl - A web platform based on XML, XSLT and Java
* This file is part of the Beryl XML GUI
*
* Copyright (C) 2004 Wenzel Jakob <wazlaf@tigris.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-3107 USA
*/
package org.beryl.gui.widgets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JRadioButton;
import org.beryl.gui.GUIException;
import org.beryl.gui.Widget;
import org.beryl.gui.WidgetInfo;
import org.beryl.gui.model.MapChangeEvent;
import org.beryl.gui.model.MapDataModel;
import org.beryl.gui.model.ModelChangeEvent;
public class ButtonGroup extends Panel {
protected static WidgetInfo buttonGroupInfo = null;
private String key = null;
private javax.swing.ButtonGroup buttonGroup = null;
static {
buttonGroupInfo = new WidgetInfo(ButtonGroup.class, panelInfo);
buttonGroupInfo.addProperty("key", "string", "");
};
public ButtonGroup(Widget parentWidget, String name) throws GUIException {
super(parentWidget, name);
buttonGroup = new javax.swing.ButtonGroup();
}
public void setProperty(String name, Object value) throws GUIException {
if ("key".equals(name)) {
this.key = (String) value;
} else {
super.setProperty(name, value);
}
}
public void addChild(Widget widget, Object constraint) throws GUIException {
if (widget instanceof RadioButton) {
final RadioButton radioButton = (RadioButton) widget;
JRadioButton button = (JRadioButton) radioButton.getRealWidget();
super.addChild(widget, constraint);
buttonGroup.add(button);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
MapDataModel model = getDataModel();
if (model != null && key != null) {
model.setValue(ButtonGroup.this, key, radioButton.getValue());
}
} catch (GUIException ex) {
throw new RuntimeException(ex);
}
}
});
} else {
super.addChild(widget, constraint);
}
}
public void removeChildWidget(Widget widget) throws GUIException {
if (widget instanceof RadioButton) {
RadioButton radioButton = (RadioButton) widget;
buttonGroup.remove((JRadioButton) radioButton.getRealWidget());
}
super.removeChildWidget(widget);
}
private void reload() throws GUIException {
Object value = (Object) getDataModel().getValue(key);
if (value != null) {
RadioButton button = findButton(value);
if (button != null)
((JRadioButton) button.getRealWidget()).setSelected(true);
else
throw new GUIException("Invalid radio button value [" + value + "]");
}
}
public void modelChanged(ModelChangeEvent e) throws GUIException {
if (e.getSource() == this) {
/* New data model */
reload();
} else if (e instanceof MapChangeEvent) {
MapChangeEvent event = (MapChangeEvent) e;
if (event.getKey() == null) {
reload();
} else if (event.getKey().equals(key)) {
RadioButton button = findButton(event.getNewValue());
if (button != null)
((JRadioButton) button.getRealWidget()).setSelected(true);
else
throw new GUIException("Invalid radio button value [" + event.getNewValue() + "]");
}
}
}
private RadioButton findButton(Object object) throws GUIException {
for (int i=0, count = getChildCount(); i<count; i++) {
Widget widget = (Widget) getChild(i);
if (widget instanceof RadioButton) {
RadioButton button = (RadioButton) widget;
if (button.getValue() == object || button.getValue().equals(object)) {
return button;
}
}
}
throw new GUIException("Value not found in ButtonGroup");
}
public WidgetInfo getWidgetInfo() {
return buttonGroupInfo;
}
}