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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.util.Arrays;
import javax.swing.*;
import javax.swing.tree.TreePath;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
JTree tree = new JTree();
tree.setComponentPopupMenu(new TreePopupMenu());
JButton button = new JButton("Clear node selection");
button.addActionListener(e -> tree.clearSelection());
add(new JScrollPane(tree));
add(button, BorderLayout.SOUTH);
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);
}
}
final class TreePopupMenu extends JPopupMenu {
/* default */ TreePopupMenu() {
super();
add("path").addActionListener(e -> {
JTree tree = (JTree) getInvoker();
TreePath path = tree.getSelectionPath();
if (path != null) {
JOptionPane.showMessageDialog(tree, path, "path", JOptionPane.INFORMATION_MESSAGE);
}
});
add("JMenuItem");
}
@Override public void show(Component c, int x, int y) {
if (c instanceof JTree) {
JTree tree = (JTree) c;
TreePath path = tree.getPathForLocation(x, y);
// tree.getSelectionCount() > 0 == tree.getSelectionPaths() != null
TreePath[] tsp = tree.getSelectionPaths();
if (tsp != null && Arrays.asList(tsp).contains(path)) {
super.show(c, x, y);
}
}
}
}