/
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 BorderLayout());
JCheckBox check = new JCheckBox("Adjust JPopupMenu location", true);
check.setFocusPainted(false);
JPopupMenu popup = makePopupMenu(check);
// setComponentPopupMenu(popup);
JLabel label = new JLabel("JLabel: 1234567890");
label.setOpaque(true);
// label.setInheritsPopupMenu(true);
// check.setInheritsPopupMenu(true);
label.setComponentPopupMenu(popup);
add(check, BorderLayout.NORTH);
add(label);
setBorder(BorderFactory.createLineBorder(Color.RED, 10));
setPreferredSize(new Dimension(320, 240));
}
private static JPopupMenu makePopupMenu(JCheckBox check) {
JPopupMenu popup = new JPopupMenu() {
@Override public void show(Component c, int x, int y) {
if (check.isSelected()) {
Point p = new Point(x, y);
Rectangle r = c.getBounds();
Dimension d = getPreferredSize();
if (p.x + d.width > r.width) {
p.x -= d.width;
}
if (p.y + d.height > r.height) {
p.y -= d.height;
}
super.show(c, Math.max(p.x, 0), Math.max(p.y, 0));
} else {
super.show(c, x, y);
}
}
};
popup.add("JMenuItem: 11111");
popup.add("JMenuItem: 222");
popup.add("JMenuItem: 3");
return popup;
}
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);
}
}