我正在尝试构建基于 JTree 的文件浏览器并尝试使用setSelectionPathwith导航到特定路径DefaultMutableTreeNode。
我已经从这里参考了代码
import java.io.File;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Vector;
import static javax.management.Query.value;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
public class FileSysBrowser extends JFrame {
public JTree fileTree;
private FileSystemModel fileSystemModel;
static String REPO = "repo/dinesh/trunk";
static String[] REPO_PATH = REPO.split("/", -1);
static int repoPathIdx = 0;
private JTextArea fileDetailsTextArea = new JTextArea();
public FileSysBrowser(String directory) {
System.out.println(Arrays.toString(REPO_PATH));
setTitle("FileSysBrowser");
fileDetailsTextArea.setEditable(false);
fileSystemModel = new FileSystemModel(new File(directory));
fileTree = new JTree(fileSystemModel);
fileTree.setEditable(true);
fileTree.addTreeSelectionListener(new TreeSelectionListener() {
@Override
public void valueChanged(TreeSelectionEvent event) {
// System.out.println(fileTree.getLastSelectedPathComponent());
// File file = (File) fileTree.getLastSelectedPathComponent();
// fileDetailsTextArea.setText(getFileDetails(file));
}
});
getContentPane().add(new JScrollPane(fileTree));
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(640, 480);
setVisible(true);
}
private DefaultMutableTreeNode buildNodeFromString(String path) {
String[] s = path.split("/");
File myFilePath = new File(path);
DefaultMutableTreeNode node, lastNode = null, root = null;
for (String str : s) {
if (str.indexOf(":") != -1) {
str = str.substring(0, str.indexOf(":"));
}
node = new DefaultMutableTreeNode(str);
if (root == null) {
root = node;
}
if (lastNode != null) {
lastNode.add(node);
}
lastNode = node;
}
return root;
}
public static void main(String args[]) {
FileSysBrowser fileSysBrowser = new FileSysBrowser("/");
JTree jt = fileSysBrowser.fileTree;
// jt.expandRow(21);
// jt.expandRow(32);
// TreePath pathForRow = jt.getPathForRow(4);
// System.out.println(pathForRow);
DefaultMutableTreeNode node = fileSysBrowser.buildNodeFromString("repo/dinesh/trunk");
TreePath pathForRow = new TreePath(node.getLastLeaf().getPath());
System.out.println("pathForRow : " + pathForRow);
jt.setSelectionPath(pathForRow);
}
}
class FileSystemModel implements TreeModel {
private File root;
private final Vector listeners = new Vector();
public FileSystemModel(File rootDirectory) {
root = rootDirectory;
}
@Override
public Object getRoot() {
return root;
}
@Override
public Object getChild(Object parent, int index) {
File directory = (File) parent;
String[] children = directory.list();
Arrays.sort(children);
String currentChild = children[index];
return new TreeFile(directory, currentChild);
}
@Override
public int getChildCount(Object parent) {
File file = (File) parent;
if (file.isDirectory()) {
String[] fileList = file.list();
if (fileList != null) {
return file.list().length;
}
}
return 0;
}
@Override
public boolean isLeaf(Object node) {
if (node.getClass() == DefaultMutableTreeNode.class) {
DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode) node;
System.out.println("chidcount ->" + dmtn.getChildCount());
System.out.println(dmtn.getChildCount()==0);
return dmtn.getChildCount() == 0;
} else {
File file = (File) node;
return file.isFile();
}
}
@Override
public int getIndexOfChild(Object parent, Object child) {
File directory = (File) parent;
File file = (File) child;
String[] children = directory.list();
for (int i = 0; i < children.length; i++) {
if (file.getName().equals(children[i])) {
return i;
}
}
return -1;
}
@Override
public void valueForPathChanged(TreePath path, Object value) {
File oldFile = (File) path.getLastPathComponent();
String fileParentPath = oldFile.getParent();
String newFileName = (String) value;
File targetFile = new File(fileParentPath, newFileName);
oldFile.renameTo(targetFile);
File parent = new File(fileParentPath);
int[] changedChildrenIndices = {getIndexOfChild(parent, targetFile)};
Object[] changedChildren = {targetFile};
fireTreeNodesChanged(path.getParentPath(), changedChildrenIndices, changedChildren);
}
private void fireTreeNodesChanged(TreePath parentPath, int[] indices, Object[] children) {
TreeModelEvent event = new TreeModelEvent(this, parentPath, indices, children);
Iterator iterator = listeners.iterator();
TreeModelListener listener = null;
while (iterator.hasNext()) {
listener = (TreeModelListener) iterator.next();
listener.treeNodesChanged(event);
}
}
@Override
public void addTreeModelListener(TreeModelListener listener) {
listeners.add(listener);
}
@Override
public void removeTreeModelListener(TreeModelListener listener) {
listeners.remove(listener);
}
private class TreeFile extends File {
public TreeFile(File parent, String child) {
super(parent, child);
}
@Override
public String toString() {
return getName();
}
}
}
我刚刚包括isLeaf单独检查。到目前为止，它还没有扩展路径。
只有，我expandRow能够实现节点扩展。
我应该怎么做才能让它工作setSelectionPath？