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| 14. 67. 15. 搜索节点的JTree |
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import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
import javax.swing.BorderFactory;
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.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
public class EditableTree extends JFrame {
private DefaultMutableTreeNode m_rootNode = new DefaultMutableTreeNode("AA");
private DefaultTreeModel m_model = new DefaultTreeModel(m_rootNode);
private JTree m_tree = new JTree(m_model);
private JButton m_addButton = new JButton("Add Node");
private JButton m_delButton = new JButton("Delete Node");
private JButton m_searchButton = new JButton("Search Node");
private JButton m_searchAndDeleteButton = new JButton("Search and Delete Node");
private JTextField m_searchText;
public EditableTree() {
DefaultMutableTreeNode forums = new DefaultMutableTreeNode("A");
forums.add(new DefaultMutableTreeNode("B"));
DefaultMutableTreeNode articles = new DefaultMutableTreeNode("E");
articles.add(new DefaultMutableTreeNode("F"));
DefaultMutableTreeNode examples = new DefaultMutableTreeNode("G");
examples.add(new DefaultMutableTreeNode("H"));
m_rootNode.add(forums);
m_rootNode.add(articles);
m_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.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
DefaultMutableTreeNode selNode = (DefaultMutableTreeNode) m_tree
.getLastSelectedPathComponent();
if (selNode == null) {
return;
}
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New Node");
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);
m_delButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
DefaultMutableTreeNode selNode = (DefaultMutableTreeNode) m_tree
.getLastSelectedPathComponent();
removeNode(selNode);
}
});
panel.add(m_delButton);
JPanel searchPanel = new JPanel();
searchPanel.setBorder(BorderFactory.createEtchedBorder());
m_searchText = new JTextField(10);
searchPanel.add(m_searchText);
m_searchButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
DefaultMutableTreeNode node = searchNode(m_searchText.getText());
if (node != null) {
TreeNode[] nodes = m_model.getPathToRoot(node);
TreePath path = new TreePath(nodes);
m_tree.scrollPathToVisible(path);
m_tree.setSelectionPath(path);
} else {
System.out.println("Node with string " + m_searchText.getText() + " not found");
}
}
});
searchPanel.add(m_searchButton);
m_searchAndDeleteButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
DefaultMutableTreeNode node = searchNode(m_searchText.getText());
if (node != null) {
removeNode(node);
} else {
System.out.println("Node with string " + m_searchText.getText() + " not found");
}
}
});
searchPanel.add(m_searchAndDeleteButton);
panel.add(searchPanel);
getContentPane().add(panel, BorderLayout.SOUTH);
setSize(700, 400);
setVisible(true);
}
public DefaultMutableTreeNode searchNode(String nodeStr) {
DefaultMutableTreeNode node = null;
Enumeration e = m_rootNode.breadthFirstEnumeration();
while (e.hasMoreElements()) {
node = (DefaultMutableTreeNode) e.nextElement();
if (nodeStr.equals(node.getUserObject().toString())) {
return node;
}
}
return null;
}
public void removeNode(DefaultMutableTreeNode selNode) {
if (selNode == null) {
return;
}
MutableTreeNode parent = (MutableTreeNode) (selNode.getParent());
if (parent == null) {
return;
}
MutableTreeNode toBeSelNode = getSibling(selNode);
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);
}
private MutableTreeNode getSibling(DefaultMutableTreeNode selNode) {
MutableTreeNode sibling = (MutableTreeNode) selNode.getPreviousSibling();
if (sibling == null) {
sibling = (MutableTreeNode) selNode.getNextSibling();
}
return sibling;
}
public static void main(String[] arg) {
EditableTree editableTree = new EditableTree();
}
}
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