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| import java.awt.BorderLayout;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.events.XMLEvent;
public class JComboBoxDemo {
public static void main(String[] args) {
List<Grade> grades = populateGrades();
JFrame frame = new JFrame("Démo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
JComboBox<Grade> combo1 = new JComboBox<>(grades.stream().toArray(Grade[]::new));
JComboBox<Echelle> combo2 = new JComboBox<>();
JComboBox<Echelon> combo3 = new JComboBox<>();
panel.add(combo1);
panel.add(combo2);
panel.add(combo3);
frame.add(panel);
JTextField indiceField = new JTextField(10);
JPanel fieldPanel = new JPanel();
fieldPanel.add(indiceField);
frame.add(fieldPanel, BorderLayout.SOUTH);
combo1.addItemListener(e->selectCombo1(combo1,combo2));
combo2.addItemListener(e->selectCombo2(combo2,combo3));
combo3.addItemListener(e->selectCombo3(combo3,indiceField));
// sert à simuler les évenements pour la première sélection
selectCombo1(combo1, combo2);
selectCombo2(combo2, combo3);
selectCombo3(combo3, indiceField);
frame.setSize(500, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static List<Grade> populateGrades() {
List<Grade> grades = new ArrayList<>();
XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
xmlInputFactory.setProperty(XMLInputFactory.IS_COALESCING, Boolean.TRUE);
xmlInputFactory.setProperty(XMLInputFactory.IS_REPLACING_ENTITY_REFERENCES, Boolean.TRUE);
try(InputStream inputStream = JComboBoxDemo.class.getResourceAsStream("grades.xml")) {
XMLStreamReader reader = xmlInputFactory.createXMLStreamReader( inputStream );
while( reader.hasNext() ) {
int eventType = reader.next();
if ( XMLEvent.START_ELEMENT==eventType ) {
if ( "grade".equalsIgnoreCase(reader.getLocalName()) ) {
grades.add(createGrade(reader));
}
}
else if ( XMLEvent.END_ELEMENT==eventType ) {
if ( !"grade".equalsIgnoreCase(reader.getLocalName()) ) {
break;
}
}
}
} catch (IOException | XMLStreamException e) {
e.printStackTrace();
}
return grades;
}
private static Grade createGrade(XMLStreamReader reader) throws XMLStreamException {
String name = reader.getAttributeValue(null, "nom");
List<Echelle> echelles = new ArrayList<>();
while( reader.hasNext() ) {
int eventType = reader.next();
if ( XMLEvent.START_ELEMENT==eventType ) {
if ( "echelle".equalsIgnoreCase(reader.getLocalName()) ) {
echelles.add(createEchelle(reader));
}
}
else if ( XMLEvent.END_ELEMENT==eventType ) {
if ( !"echelle".equalsIgnoreCase(reader.getLocalName()) ) {
break;
}
}
}
return new Grade(name, echelles);
}
private static Echelle createEchelle(XMLStreamReader reader) throws XMLStreamException {
String name = reader.getAttributeValue(null, "nom");
List<Echelon> echelons = new ArrayList<>();
while( reader.hasNext() ) {
int eventType = reader.next();
if ( XMLEvent.START_ELEMENT==eventType ) {
if ( "echelon".equalsIgnoreCase(reader.getLocalName()) ) {
echelons.add(createEchelon(reader));
}
}
else if ( XMLEvent.END_ELEMENT==eventType ) {
if ( !"echelon".equalsIgnoreCase(reader.getLocalName()) ) {
break;
}
}
}
return new Echelle(name, echelons);
}
private static Echelon createEchelon(XMLStreamReader reader) {
String name = reader.getAttributeValue(null, "nom");
String indice = reader.getAttributeValue(null, "indice");
return new Echelon(name, indice);
}
private static void selectCombo1(JComboBox<Grade> combo1, JComboBox<Echelle> combo2) {
Grade selection1 = (Grade)combo1.getSelectedItem();
Echelle selection2 = (Echelle)combo2.getSelectedItem();
combo2.removeAllItems();
if ( selection1!=null ) {
selection1.getEchelles().forEach(echelle-> combo2.addItem(echelle));
}
if ( selection2!=null ) {
combo2.setSelectedItem(selection2);
}
}
private static void selectCombo2(JComboBox<Echelle> combo2, JComboBox<Echelon> combo3) {
Echelle selection2 = (Echelle)combo2.getSelectedItem();
Echelon selection3 = (Echelon)combo3.getSelectedItem();
combo3.removeAllItems();
if ( selection2!=null ) {
selection2.getEchelons().forEach(echelon-> combo3.addItem(echelon));
}
if ( selection3!=null ) {
combo3.setSelectedItem(selection3);
}
}
private static void selectCombo3(JComboBox<Echelon> combo3, JTextField indiceField) {
Echelon echelon = (Echelon) combo3.getSelectedItem();
if ( echelon==null) {
indiceField.setText("");
}
else {
indiceField.setText(echelon.getIndice());
}
}
public static class Grade {
private final String grade;
private final List<Echelle> echelles;
public Grade(String grade, List<Echelle> echelles) {
this.grade=grade;
this.echelles = Collections.unmodifiableList(new ArrayList<>(echelles));
}
public List<Echelle> getEchelles() {
return echelles;
}
public String toString() {
return grade;
}
}
public static class Echelle {
private final String echelle ;
private final List<Echelon> echelons;
public Echelle(String echelle, List<Echelon> echelons) {
this.echelle=echelle;
this.echelons=Collections.unmodifiableList(echelons);
}
public List<Echelon> getEchelons() {
return echelons;
}
public String toString() {
return echelle;
}
}
public static class Echelon {
private final String echelon ;
private final String indice;
public Echelon(String echelon, String indice) {
this.echelon=echelon;
this.indice=indice;
}
public String getIndice() {
return indice;
}
public String toString() {
return echelon;
}
}
} |
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