JTree: addTreeSelectionListener(TreeSelectionListener tsl) : JTree « javax.swing « Java by API

1. Java by API
2. javax.swing
3. JTree

JTree: addTreeSelectionListener(TreeSelectionListener tsl)

  
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.io.File;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;

public class MainClass extends JPanel {
  public MainClass(File dir) {
    setLayout(new BorderLayout());
    JTree tree = new JTree(addNodes(null, dir));

    tree.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent e) {
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.getPath().getLastPathComponent();
        System.out.println("You selected " + node);
      }
    });

    JScrollPane scrollpane = new JScrollPane();
    scrollpane.getViewport().add(tree);
    add(BorderLayout.CENTER, scrollpane);
  }

  DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop, File dir) {
    String curPath = dir.getPath();
    DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath);
    if (curTop != null) {
      curTop.add(curDir);
    }
    ArrayList ol = new ArrayList();
    String[] tmp = dir.list();
    for (int i = 0; i < tmp.length; i++)
      ol.add(tmp[i]);
    File f;
    ArrayList files = new ArrayList();

    for (int i = 0; i < ol.size(); i++) {
      String thisObject = (String) ol.get(i);
      String newPath;
      if (curPath.equals("."))
        newPath = thisObject;
      else
        newPath = curPath + File.separator + thisObject;
      if ((f = new File(newPath)).isDirectory())
        addNodes(curDir, f);
      else
        files.add(thisObject);
    }
    for (int fnum = 0; fnum < files.size(); fnum++)
      curDir.add(new DefaultMutableTreeNode(files.get(fnum)));
    return curDir;
  }

  public Dimension getMinimumSize() {
    return new Dimension(200, 400);
  }

  public Dimension getPreferredSize() {
    return new Dimension(200, 400);
  }

  public static void main(String[] av) {
    JFrame frame = new JFrame("MainClass");
    frame.setForeground(Color.black);
    frame.setBackground(Color.lightGray);
    Container cp = frame.getContentPane();
    cp.add(new MainClass(new File(".")));

    frame.pack();
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
}
           
         
    
  

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