Install ToolTips for Tree (JTree)

    
/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski     
ISBN: 1-893115-78-X
Publisher: APress
*/

import java.awt.BorderLayout;
import java.awt.Component;
import java.util.Dictionary;
import java.util.Properties;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellRenderer;

public class TreeTips {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Tree Tips");
    Properties props = System.getProperties();
    JTree tree = new JTree(props);
    ToolTipManager.sharedInstance().registerComponent(tree);
    TreeCellRenderer renderer = new ToolTipTreeCellRenderer(props);
    tree.setCellRenderer(renderer);
    JScrollPane scrollPane = new JScrollPane(tree);
    frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}

class ToolTipTreeCellRenderer implements TreeCellRenderer {
  DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();

  Dictionary tipTable;

  public ToolTipTreeCellRenderer(Dictionary tipTable) {
    this.tipTable = tipTable;
  }

  public Component getTreeCellRendererComponent(JTree tree, Object value,
      boolean selected, boolean expanded, boolean leaf, int row,
      boolean hasFocus) {
    renderer.getTreeCellRendererComponent(tree, value, selected, expanded,
        leaf, row, hasFocus);
    if (value != null) {
      Object tipKey;
      if (value instanceof DefaultMutableTreeNode) {
        tipKey = ((DefaultMutableTreeNode) value).getUserObject();
      } else {
        tipKey = tree.convertValueToText(value, selected, expanded,
            leaf, row, hasFocus);
      }
      Object tip = tipTable.get(tipKey);
      if (tip != null) {
        renderer.setToolTipText(tip.toString());
      } else {
        renderer.setToolTipText(null);
      }
    }
    return renderer;
  }
}

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Install ToolTips for Tree (JTree) : Tree « Swing JFC « Java

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