src/share/demo/jfc/SampleTree/SampleTreeModel.java

/*
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 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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/*
 */

import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.Color;

/**
  * SampleTreeModel extends JTreeModel to extends valueForPathChanged.
  * This method is called as a result of the user editing a value in
  * the tree.  If you allow editing in your tree, are using TreeNodes
  * and the user object of the TreeNodes is not a String, then you're going
  * to have to subclass JTreeModel as this example does.
  *
  * @author Scott Violet
  */

public class SampleTreeModel extends DefaultTreeModel
{
    /**
      * Creates a new instance of SampleTreeModel with newRoot set
      * to the root of this model.
      */
    public SampleTreeModel(TreeNode newRoot) {
        super(newRoot);
    }

    /**
      * Subclassed to message setString() to the changed path item.
      */
    public void valueForPathChanged(TreePath path, Object newValue) {
        /* Update the user object. */
        DefaultMutableTreeNode      aNode = (DefaultMutableTreeNode)path.getLastPathComponent();
        SampleData    sampleData = (SampleData)aNode.getUserObject();

        sampleData.setString((String)newValue);
        /* UUUhhhhh, pretty colors. */
        sampleData.setColor(Color.green);

        /* Since we've changed how the data is to be displayed, message
           nodeChanged. */
        nodeChanged(aNode);
    }
}