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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 BorderLayout());
UIManager.put("Tree.paintLines", Boolean.FALSE);
JTree tree = new JTree();
for (int i = 0; i < tree.getRowCount(); i++) {
tree.expandRow(i);
}
JCheckBox check = new JCheckBox("Tree.paintLines");
check.addActionListener(e -> {
UIManager.put("Tree.paintLines", ((JCheckBox) e.getSource()).isSelected());
SwingUtilities.updateComponentTreeUI(tree);
});
JPanel p = new JPanel(new GridLayout(1, 2));
p.add(new JScrollPane(tree));
p.add(new JScrollPane(new JTree()));
add(check, BorderLayout.NORTH);
add(p);
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);
}
}