Tree node editing with DefaultTreeModel : TreeModel « Swing « Java Tutorial





import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreePath;

public class MainClass {
  public static void main(String[] args) {
    MutableTreeNode root = new DefaultMutableTreeNode("A");
    MutableTreeNode beams = new DefaultMutableTreeNode("B");
    MutableTreeNode gears = new DefaultMutableTreeNode("C");
    root.insert(beams, 0);
    root.insert(gears, 1);
    beams.insert(new DefaultMutableTreeNode("4 "), 0);
    beams.insert(new DefaultMutableTreeNode("6 "), 1);
    beams.insert(new DefaultMutableTreeNode("8 "), 2);
    beams.insert(new DefaultMutableTreeNode("12 "), 3);
    gears.insert(new DefaultMutableTreeNode("8t"), 0);
    gears.insert(new DefaultMutableTreeNode("24t"), 1);
    gears.insert(new DefaultMutableTreeNode("40t"), 2);

    final DefaultTreeModel model = new DefaultTreeModel(root);
    final JTree tree = new JTree(model);

    final JTextField nameField = new JTextField("16t");
    final JButton button = new JButton("Add a part");
    button.setEnabled(false);
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        TreePath tp = tree.getSelectionPath();
        MutableTreeNode insertNode = (MutableTreeNode) tp.getLastPathComponent();
        int insertIndex = 0;
        if (insertNode.getParent() != null) {
          MutableTreeNode parent = (MutableTreeNode) insertNode.getParent();
          insertIndex = parent.getIndex(insertNode) + 1;
          insertNode = parent;
        }
        MutableTreeNode node = new DefaultMutableTreeNode(nameField.getText());
        model.insertNodeInto(node, insertNode, insertIndex);
      }
    });
    JPanel addPanel = new JPanel(new GridLayout(2, 1));
    addPanel.add(nameField);
    addPanel.add(button);

    tree.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent e) {
        TreePath tp = e.getNewLeadSelectionPath();
        button.setEnabled(tp != null);
      }
    });

    JFrame frame = new JFrame();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.getContentPane().add(new JScrollPane(tree));
    frame.getContentPane().add(addPanel, BorderLayout.SOUTH);
    frame.setVisible(true);
  }
}










14.68.TreeModel
14.68.1.Tree node editing with DefaultTreeModel
14.68.2.implements TreeModelimplements TreeModel
14.68.3.Genealogy Tree
14.68.4.JTree.getModel().addTreeModelListener(new TreeModelListener())
14.68.5.Expand All for a tree path
14.68.6.Get tree path from TreeNode