implements TreeSelectionListener to create your own listener : Tree « Swing JFC « Java

1. Java
2. Swing JFC
3. Tree

implements TreeSelectionListener to create your own listener

    
/*
Swing, Second Edition
by Matthew Robinson, Pavel Vorobiev

*/

import java.awt.*;
import java.awt.event.*;
import java.util.*;

import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;

public class Tree1 
  extends JFrame 
{

  protected JTree  m_tree = null;
  protected DefaultTreeModel m_model = null;
  protected JTextField m_display;

  public Tree1()
  {
    super("Sample Tree [OID]");
    setSize(400, 300);

        Object[] nodes = new Object[5];
    DefaultMutableTreeNode top = new DefaultMutableTreeNode(
      new OidNode(1, "ISO"));
    DefaultMutableTreeNode parent = top;
    nodes[0] = top;

    DefaultMutableTreeNode node = new DefaultMutableTreeNode(
      new OidNode(0, "standard"));
    parent.add(node);
    node = new DefaultMutableTreeNode(new OidNode(2, 
      "member-body"));
    parent.add(node);
    node = new DefaultMutableTreeNode(new OidNode(3, "org"));
    parent.add(node);
    parent = node;
    nodes[1] = parent;

    node = new DefaultMutableTreeNode(new OidNode(6, "dod"));
    parent.add(node);
    parent = node;
    nodes[2] = parent;

    node = new DefaultMutableTreeNode(new OidNode(1, 
      "internet"));
    parent.add(node);
    parent = node;
    nodes[3] = parent;

    node = new DefaultMutableTreeNode(new OidNode(1, 
      "directory"));
    parent.add(node);
    node = new DefaultMutableTreeNode(new OidNode(2, 
      "mgmt"));
    parent.add(node);
    nodes[4] = node;
    node.add(new DefaultMutableTreeNode(new OidNode(1, 
      "mib-2")));
    node = new DefaultMutableTreeNode(new OidNode(3, 
      "experimental"));
    parent.add(node);
    node = new DefaultMutableTreeNode(new OidNode(4, 
      "private"));
    node.add(new DefaultMutableTreeNode(new OidNode(1, 
      "enterprises")));
    parent.add(node);
    node = new DefaultMutableTreeNode(new OidNode(5, 
      "security"));
    parent.add(node);
    node = new DefaultMutableTreeNode(new OidNode(6, 
      "snmpV2"));
    parent.add(node);
    node = new DefaultMutableTreeNode(new OidNode(7, 
      "mail"));
    parent.add(node);

    m_model = new DefaultTreeModel(top);
    m_tree = new JTree(m_model);

    DefaultTreeCellRenderer renderer = new 
      DefaultTreeCellRenderer();
    renderer.setOpenIcon(new ImageIcon("opened.gif"));
    renderer.setClosedIcon(new ImageIcon("closed.gif"));
    renderer.setLeafIcon(new ImageIcon("leaf.gif"));
    m_tree.setCellRenderer(renderer);

    m_tree.setShowsRootHandles(true); 
    m_tree.setEditable(false);
    TreePath path = new TreePath(nodes);
    m_tree.setSelectionPath(path);

    m_tree.addTreeSelectionListener(new 
      OidSelectionListener());

    JScrollPane s = new JScrollPane();
    s.getViewport().add(m_tree);
    getContentPane().add(s, BorderLayout.CENTER);

    m_display = new JTextField();
    m_display.setEditable(false);
    getContentPane().add(m_display, BorderLayout.SOUTH);

    WindowListener wndCloser = new WindowAdapter()
    {
      public void windowClosing(WindowEvent e) 
      {
        System.exit(0);
      }
    };
    addWindowListener(wndCloser);
    
    setVisible(true);
  }

  public static void main(String argv[]) 
  {
    new Tree1();
  }

  class OidSelectionListener 
    implements TreeSelectionListener 
  {
    public void valueChanged(TreeSelectionEvent e)
    {
      TreePath path = e.getPath();
      Object[] nodes = path.getPath();
      String oid = "";
      for (int k=0; k<nodes.length; k++)
      {
        DefaultMutableTreeNode node = 
          (DefaultMutableTreeNode)nodes[k];
        OidNode nd = (OidNode)node.getUserObject();
        oid += "."+nd.getId();
      }
      m_display.setText(oid);
    }
  }
}

class OidNode
{
  protected int    m_id;
  protected String m_name;

  public OidNode(int id, String name)
  {
    m_id = id;
    m_name = name;
  }

  public int getId() 
  { 
    return m_id;
  }

  public String getName() 
  { 
    return m_name;
  }

  public String toString() 
  { 
    return m_name;
  }
}



           
         
    
    
    
  

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