/*
* 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.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ComboBoxModel;
import javax.swing.JComboBox;
import org.beryl.gui.GUIException;
import org.beryl.gui.Widget;
import org.beryl.gui.WidgetInfo;
import org.beryl.gui.model.ListDataModel;
import org.beryl.gui.model.MapChangeEvent;
import org.beryl.gui.model.MapDataModel;
import org.beryl.gui.model.ModelChangeEvent;
public class ComboBox extends Widget {
protected static WidgetInfo comboBoxInfo = null;
private JComboBox comboBox = null;
private ListDataModel listDataModel = null;
private String indexKey = null, valueKey = null;
private boolean sendEvents = true;
private boolean processEvents = true;
static {
comboBoxInfo = new WidgetInfo(ComboBox.class, widgetInfo);
comboBoxInfo.addProperty("valuekey", "string", "");
comboBoxInfo.addProperty("indexkey", "string", "");
};
public static class ComboBoxDataModelAdapter extends List.ListDataModelAdapter implements ComboBoxModel {
private Object selectedItem = null;
public ComboBoxDataModelAdapter(ListDataModel model) {
super(model);
}
public void setSelectedItem(Object anItem) {
selectedItem = anItem;
}
public Object getSelectedItem() {
return selectedItem;
}
};
public ComboBox(Widget parent, String name) throws GUIException {
super(parent, name);
comboBox = new JComboBox();
comboBox.setPreferredSize(new Dimension(MAX_WIDTH, DEFAULT_HEIGHT));
comboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
MapDataModel model = getDataModel();
if (sendEvents && model != null) {
try {
sendEvents = false;
processEvents = false;
if (indexKey != null)
model.setValue(ComboBox.this, indexKey, new Integer(comboBox.getSelectedIndex()));
if (valueKey != null)
model.setValue(ComboBox.this, valueKey, comboBox.getSelectedItem());
} finally {
sendEvents = true;
processEvents = true;
}
}
} catch (GUIException ex) {
throw new RuntimeException(ex);
}
}
});
}
public void addChild(Widget widget, Object constraint) throws GUIException {
if (widget instanceof Item) {
try {
if (listDataModel == null) {
listDataModel = new ListDataModel();
sendEvents = false;
comboBox.setModel(new ComboBoxDataModelAdapter(listDataModel));
}
listDataModel.addValue(this, widget);
addChild(widget);
} finally {
sendEvents = true;
}
} else {
throw new GUIException("Only Item children are allowed inside a ComboBox");
}
}
public void removeChildWidget(Widget widget) throws GUIException {
if (listDataModel != null) {
listDataModel.removeValue(this, widget);
super.removeChildWidget(widget);
} else {
throw new GUIException("There are no static items to remove");
}
}
public void setProperty(String name, Object value) throws GUIException {
if ("indexkey".equals(name)) {
indexKey = (String) value;
} else if ("valuekey".equals(name)) {
valueKey = (String) value;
} else {
super.setProperty(name, value);
}
}
public void setListDataModel(ListDataModel listDataModel) throws GUIException {
ModelChangeEvent event = new ModelChangeEvent(this, listDataModel);
this.listDataModel = listDataModel;
sendEvents = false;
try {
comboBox.setModel(new ComboBoxDataModelAdapter(listDataModel));
} finally {
sendEvents = true;
}
/* Reload data model information */
modelChanged(event);
}
public ListDataModel getListDataModel() {
return this.listDataModel;
}
private void reload() throws GUIException {
MapDataModel model = getDataModel();
if (model != null) {
try {
processEvents = false;
Integer index = indexKey == null ? null : (Integer) model.getValue(indexKey);
Object value = valueKey == null ? null : model.getValue(valueKey);
if (index != null) {
comboBox.setSelectedIndex(index.intValue());
comboBox.repaint();
} else if (value != null) {
comboBox.setSelectedItem(value);
comboBox.repaint();
}
if (((value != null && index == null) || (value == null && index == null)) && indexKey != null) {
model.setValue(ComboBox.this, indexKey, new Integer(comboBox.getSelectedIndex()));
}
if (((index != null && value == null) || (value == null && index == null)) && valueKey != null) {
model.setValue(ComboBox.this, valueKey, comboBox.getSelectedItem());
}
} finally {
processEvents = true;
}
} else {
}
}
public void modelChanged(ModelChangeEvent e) throws GUIException {
if (processEvents) {
try {
sendEvents = false;
if (e.getSource() == this) {
try {
reload();
} catch (IllegalArgumentException ex) {
/* Ignore, list data model is not yet set */
} catch (ArrayIndexOutOfBoundsException ex) {
/* Ignore, list data model is not yet set */
}
} else if (e instanceof MapChangeEvent) {
MapChangeEvent event = (MapChangeEvent) e;
if (event.getKey() == null) {
reload();
} else if (event.getKey().equals(indexKey)) {
try {
comboBox.setSelectedIndex(((Integer) event.getNewValue()).intValue());
comboBox.repaint();
try {
processEvents = false;
if (valueKey != null)
((MapDataModel) event.getModel()).setValue(
ComboBox.this,
valueKey,
comboBox.getSelectedItem());
} finally {
processEvents = true;
}
} catch (IllegalArgumentException ex) {
throw new GUIException("Changed data model has a bad selection index", ex);
}
} else if (event.getKey().equals(valueKey)) {
try {
comboBox.setSelectedItem(event.getNewValue());
comboBox.repaint();
try {
processEvents = false;
if (indexKey != null)
((MapDataModel) event.getModel()).setValue(
ComboBox.this,
indexKey,
new Integer(comboBox.getSelectedIndex()));
} finally {
processEvents = true;
}
} catch (IllegalArgumentException ex) {
throw new GUIException("Changed data model has a bad selection value", ex);
}
}
}
} finally {
sendEvents = true;
}
}
}
public JComboBox getComboBox() {
return comboBox;
}
public Component getWidget() {
return comboBox;
}
public WidgetInfo getWidgetInfo() {
return comboBoxInfo;
}
}