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MainPanel.java
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MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.util.Objects;
import javax.swing.*;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
String[] model = {"123456", "7890", "a"};
JComboBox<String> comboBox0 = new JComboBox<>(model);
comboBox0.setEditable(true);
JComboBox<String> comboBox1 = new JComboBox<String>(model) {
private transient PopupMenuListener handler;
@Override public void updateUI() {
removePopupMenuListener(handler);
super.updateUI();
setEditable(true);
handler = new SelectItemMenuListener();
addPopupMenuListener(handler);
}
};
JComboBox<String> comboBox2 = new JComboBox<String>(model) {
private static final int MAX_HISTORY = 10;
private static final String ENTER_PRESSED = "enterPressed";
private transient PopupMenuListener handler;
@Override public void updateUI() {
removePopupMenuListener(handler);
getActionMap().put(ENTER_PRESSED, null);
super.updateUI();
Action defaultAction = getActionMap().get(ENTER_PRESSED);
Action a = new AbstractAction() {
@Override public void actionPerformed(ActionEvent e) {
boolean isPopupVisible = isPopupVisible();
setPopupVisible(false);
DefaultComboBoxModel<String> m = (DefaultComboBoxModel<String>) getModel();
String str = Objects.toString(getEditor().getItem(), "");
if (m.getIndexOf(str) < 0) {
m.removeElement(str);
m.insertElementAt(str, 0);
if (m.getSize() > MAX_HISTORY) {
m.removeElementAt(MAX_HISTORY);
}
setSelectedIndex(0);
setPopupVisible(isPopupVisible);
} else {
defaultAction.actionPerformed(e);
}
}
};
getActionMap().put(ENTER_PRESSED, a);
setEditable(true);
handler = new SelectItemMenuListener();
addPopupMenuListener(handler);
}
};
JPanel p = new JPanel(new GridLayout(0, 1));
p.add(new JLabel("Default:", SwingConstants.LEFT));
p.add(comboBox0);
p.add(Box.createVerticalStrut(15));
p.add(new JLabel("popupMenuWillBecomeVisible:", SwingConstants.LEFT));
p.add(comboBox1);
p.add(Box.createVerticalStrut(15));
p.add(new JLabel("+enterPressed Action:", SwingConstants.LEFT));
p.add(comboBox2);
add(p, BorderLayout.NORTH);
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
setPreferredSize(new Dimension(320, 240));
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class SelectItemMenuListener implements PopupMenuListener {
@Override public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
JComboBox<?> c = (JComboBox<?>) e.getSource();
c.setSelectedItem(c.getEditor().getItem());
}
@Override public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
/* not needed */
}
@Override public void popupMenuCanceled(PopupMenuEvent e) {
/* not needed */
}
}