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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.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import javax.swing.*;
public final class MainPanel extends JPanel {
public static final AtomicInteger COUNTER = new AtomicInteger(0);
public static JFrame createFrame(String title) {
JFrame frame = new JFrame(Objects.toString(title, "Frame #" + COUNTER));
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
COUNTER.getAndIncrement();
frame.addWindowListener(new WindowAdapter() {
@Override public void windowClosing(WindowEvent e) {
if (COUNTER.getAndDecrement() == 0) {
Window w = e.getWindow();
if (w instanceof JFrame) {
((JFrame) w).setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
}
});
return frame;
}
private MainPanel() {
super(new BorderLayout());
JButton button = new JButton("New Frame");
button.addActionListener(e -> {
JButton b = (JButton) e.getSource();
JFrame f = createFrame(null);
f.getContentPane().add(new MainPanel());
f.pack();
Container c = b.getTopLevelAncestor();
if (c instanceof Window) {
Point pt = c.getLocation();
f.setLocation(pt.x, pt.y + f.getSize().height);
}
// f.setLocationByPlatform(true);
f.setVisible(true);
});
add(button);
setPreferredSize(new Dimension(320, 100));
}
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 = createFrame("@title@"); // new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}