TreeTips.java Source code

Introduction

Here is the source code for TreeTips.java

Source

/*
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;
    }
}