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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 javax.swing.*;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new GridLayout(2, 1));
add(new JButton("JButton"));
add(makeOverlayLayoutButton());
setPreferredSize(new Dimension(320, 240));
}
private static Component makeOverlayLayoutButton() {
JButton b1 = new JButton("OverlayLayoutButton");
b1.setLayout(new OverlayLayout(b1));
b1.addActionListener(e -> Toolkit.getDefaultToolkit().beep());
Insets i = b1.getInsets();
b1.setBorder(BorderFactory.createEmptyBorder(i.top, i.left, i.bottom, 4));
JButton b2 = new JButton("▼") {
private final Dimension dim = new Dimension(120, 24);
@Override public Dimension getPreferredSize() {
return dim;
}
@Override public Dimension getMaximumSize() {
return getPreferredSize();
}
@Override public Dimension getMinimumSize() {
return getPreferredSize();
}
};
b2.addActionListener(e -> JOptionPane.showMessageDialog(b2, "▼:sub"));
b2.setAlignmentX(RIGHT_ALIGNMENT);
b2.setAlignmentY(BOTTOM_ALIGNMENT);
b1.add(b2);
return b1;
}
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);
}
}