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| package demo;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.EventListener;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.event.EventListenerList;
public class Formulaire extends JPanel {
private static final long serialVersionUID = 1L;
public enum IdData {
DATA1,
DATA2;
}
private DataModel dataModel;
private Controller controller;
private JComboBox<String> combo1;
private JComboBox<String> combo2;
/**
*
*/
public Formulaire(String[] dataCombo1, String[] dataCombo2) {
dataModel=new DataModel();
controller=new Controller();
setLayout(new GridLayout(2,2));
add(new JLabel("Choix 1"));
combo1=new JComboBox<>(dataCombo1);
add(combo1);
combo1.addActionListener(controller);
add(new JLabel("Choix 2"));
combo2=new JComboBox<>(dataCombo2);
add(combo2);
combo2.addActionListener(controller);
dataModel.setData1((String) combo1.getSelectedItem());
dataModel.setData2((String) combo2.getSelectedItem());
addChangeListener(new IDataModelChangeListener() {
@Override
public void valueChange(Object source, IdData id, Object oldValue,
Object newValue) {
switch (id) {
case DATA1:
if ( changed(combo1.getSelectedItem(), newValue) ) {
combo1.setSelectedItem(newValue);
}
break;
case DATA2:
if ( changed(combo2.getSelectedItem(), newValue) ) {
combo2.setSelectedItem(newValue);
}
break;
default:
break;
}
}
});
}
public String getData1() {
return dataModel.getData1();
}
public String getData2() {
return dataModel.getData2();
}
public void addChangeListener(IDataModelChangeListener listener) {
dataModel.add(listener);
}
public void removeChangeListener(IDataModelChangeListener listener) {
dataModel.remove(listener);
}
private static boolean changed(Object oldValue, Object newValue) {
if ( oldValue==null ) {
if ( newValue==null ) {
return false;
}
else {
return true;
}
}
else if ( oldValue.equals(newValue)) {
return false;
}
else {
return true;
}
}
private class DataModel {
private EventListenerList listenerList = new EventListenerList();
private String data1;
private String data2;
public void setData1(String data1) {
Object old = this.data1;
this.data1 = data1;
fireEvent(IdData.DATA1, old, this.data1);
}
public String getData1() {
return data1;
}
public void setData2(String data2) {
Object old = this.data2;
this.data2 = data2;
fireEvent(IdData.DATA2, old, this.data2);
}
public String getData2() {
return data2;
}
public void remove(IDataModelChangeListener listener) {
listenerList.remove(IDataModelChangeListener.class,listener);
}
public void add(IDataModelChangeListener listener) {
listenerList.add(IDataModelChangeListener.class,listener);
}
private void fireEvent(IdData dataId, Object oldValue, Object newValue) {
if ( !changed(oldValue,newValue) ) {
return;
}
for(IDataModelChangeListener listener : listenerList.getListeners(IDataModelChangeListener.class) ) {
listener.valueChange(Formulaire.this, dataId, oldValue, newValue);
}
}
}
public static interface IDataModelChangeListener extends EventListener {
public void valueChange(Object source, IdData id, Object oldValue, Object newValue);
}
private class Controller implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if ( e.getSource()==combo1 ) {
dataModel.setData1((String) combo1.getSelectedItem());
}
else if ( e.getSource()==combo2 ) {
dataModel.setData2((String) combo2.getSelectedItem());
}
}
}
} |
