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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.*;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new GridLayout(1, 3));
Icon icon = new ColorIcon(Color.RED);
JTree tree1 = new JTree() {
@Override public void updateUI() {
setCellRenderer(null);
super.updateUI();
DefaultTreeCellRenderer r = new DefaultTreeCellRenderer();
setCellRenderer((tree, value, selected, expanded, leaf, row, hasFocus) -> {
Component c = r.getTreeCellRendererComponent(
tree, value, selected, expanded, leaf, row, hasFocus);
if (c instanceof JLabel) {
((JLabel) c).setIcon(icon);
}
return c;
});
}
};
tree1.setEditable(true);
JTree tree2 = new JTree() {
@Override public void updateUI() {
setCellRenderer(null);
super.updateUI();
DefaultTreeCellRenderer r = new DefaultTreeCellRenderer();
r.setOpenIcon(icon);
r.setClosedIcon(icon);
r.setLeafIcon(icon);
setCellRenderer(r);
}
};
tree2.setEditable(true);
JTree tree3 = new JTree() {
@Override public void updateUI() {
setCellRenderer(null);
setCellEditor(null);
super.updateUI();
DefaultTreeCellRenderer r2 = new DefaultTreeCellRenderer();
r2.setOpenIcon(icon);
r2.setClosedIcon(icon);
r2.setLeafIcon(icon);
DefaultTreeCellRenderer r3 = new DefaultTreeCellRenderer();
r3.setOpenIcon(new ColorIcon(Color.GREEN));
r3.setClosedIcon(new ColorIcon(Color.BLUE));
r3.setLeafIcon(new ColorIcon(Color.ORANGE));
setCellRenderer(r2);
setCellEditor(new DefaultTreeCellEditor(this, r3));
}
};
tree3.setEditable(true);
add(new JScrollPane(tree1));
add(new JScrollPane(tree2));
add(new JScrollPane(tree3));
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);
}
}
class ColorIcon implements Icon {
private final Color color;
protected ColorIcon(Color color) {
this.color = color;
}
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g.create();
g2.translate(x, y);
g2.setPaint(color);
g2.fillRect(1, 1, getIconWidth() - 2, getIconHeight() - 2);
g2.dispose();
}
@Override public int getIconWidth() {
return 16;
}
@Override public int getIconHeight() {
return 16;
}
}