Trees - The Definitive Guide to Java Swing - page 642

Listing 17-10. Custom Node Renderer for a JTree
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.tree.*;
import java.awt.*;
public class CheckBoxNodeRenderer implements TreeCellRenderer {
private JCheckBox leafRenderer = new JCheckBox();
private DefaultTreeCellRenderer nonLeafRenderer = new DefaultTreeCellRenderer();
Color selectionBorderColor, selectionForeground, selectionBackground,
textForeground, textBackground;
protected JCheckBox getLeafRenderer() {
return leafRenderer;
}
public CheckBoxNodeRenderer() {
Font fontValue;
fontValue = UIManager.getFont("Tree.font");
if (fontValue != null) {
leafRenderer.setFont(fontValue);
}
Boolean booleanValue =
(Boolean)UIManager.get("Tree.drawsFocusBorderAroundIcon");
leafRenderer.setFocusPainted((booleanValue != null) &&
(booleanValue.booleanValue()));
selectionBorderColor = UIManager.getColor("Tree.selectionBorderColor");
selectionForeground = UIManager.getColor("Tree.selectionForeground");
selectionBackground = UIManager.getColor("Tree.selectionBackground");
textForeground = UIManager.getColor("Tree.textForeground");
textBackground = UIManager.getColor("Tree.textBackground");
}
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
Component returnValue;
if (leaf) {
String stringValue = tree.convertValueToText(value, selected, expanded,
leaf, row, false);
leafRenderer.setText(stringValue);
leafRenderer.setSelected(false);
leafRenderer.setEnabled(tree.isEnabled());