import java.awt.BorderLayout;
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.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
public class Main extends JFrame {
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("A");
private DefaultTreeModel m_model = new DefaultTreeModel(rootNode);
private JTree m_tree = new JTree(m_model);
private JButton m_addButton;
private JButton m_delButton;
public Main() {
DefaultMutableTreeNode forums = new DefaultMutableTreeNode("B");
forums.add(new DefaultMutableTreeNode("T"));
DefaultMutableTreeNode articles = new DefaultMutableTreeNode("A");
articles.add(new DefaultMutableTreeNode("A"));
DefaultMutableTreeNode examples = new DefaultMutableTreeNode("E");
examples.add(new DefaultMutableTreeNode("E"));
rootNode.add(forums);
rootNode.add(articles);
rootNode.add(examples);
m_tree.setEditable(true);
m_tree.setSelectionRow(0);
JScrollPane scrollPane = new JScrollPane(m_tree);
getContentPane().add(scrollPane, BorderLayout.CENTER);
JPanel panel = new JPanel();
m_addButton = new JButton("Add Node");
m_addButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
DefaultMutableTreeNode selNode = (DefaultMutableTreeNode) m_tree
.getLastSelectedPathComponent();
if (selNode == null) {
return;
}
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New");
m_model.insertNodeInto(newNode, selNode, selNode.getChildCount());
TreeNode[] nodes = m_model.getPathToRoot(newNode);
TreePath path = new TreePath(nodes);
m_tree.scrollPathToVisible(path);
m_tree.setSelectionPath(path);
m_tree.startEditingAtPath(path);
}
});
panel.add(m_addButton);
getContentPane().add(panel, BorderLayout.SOUTH);
m_delButton = new JButton("Delete Node");
m_delButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
DefaultMutableTreeNode selNode = (DefaultMutableTreeNode) m_tree
.getLastSelectedPathComponent();
if (selNode == null) {
return;
}
MutableTreeNode parent = (MutableTreeNode) (selNode.getParent());
if (parent == null) {
return;
}
MutableTreeNode toBeSelNode = (MutableTreeNode) selNode.getPreviousSibling();
if (toBeSelNode == null) {
toBeSelNode = (MutableTreeNode) selNode.getNextSibling();
}
if (toBeSelNode == null) {
toBeSelNode = parent;
}
TreeNode[] nodes = m_model.getPathToRoot(toBeSelNode);
TreePath path = new TreePath(nodes);
m_tree.scrollPathToVisible(path);
m_tree.setSelectionPath(path);
m_model.removeNodeFromParent(selNode);
}
});
panel.add(m_delButton);
getContentPane().add(panel, BorderLayout.SOUTH);
setSize(300, 400);
setVisible(true);
}
public static void main(String[] arg) {
new Main();
}
}