FileTreepublic class FileTree extends JPanel | Display a file system in a JTree view |
| Constructors Summary |
|---|
public FileTree(File dir)Construct a FileTree
setLayout(new BorderLayout());
// Make a tree list with all the nodes, and make it a JTree
JTree tree = new JTree(addNodes(null, dir));
// Add a listener
tree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node =
(DefaultMutableTreeNode)e.getPath().getLastPathComponent();
System.out.println("You selected " + node);
}
});
// Lastly, put the JTree into a JScrollPane.
JScrollPane scrollpane = new JScrollPane();
scrollpane.getViewport().add(tree);
add(BorderLayout.CENTER, scrollpane);
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| Methods Summary |
|---|
| javax.swing.tree.DefaultMutableTreeNode | addNodes(javax.swing.tree.DefaultMutableTreeNode curTop, java.io.File dir)Add nodes from under "dir" into curTop. Highly recursive.
String curPath = dir.getPath();
DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath);
if (curTop != null) { // should only be null at root
curTop.add(curDir);
}
Vector ol = new Vector();
String[] tmp = dir.list();
for (int i=0; i<tmp.length; i++)
ol.addElement(tmp[i]);
Collections.sort(ol, String.CASE_INSENSITIVE_ORDER);
File f;
Vector files = new Vector();
// Make two passes, one for Dirs and one for Files. This is #1.
for (int i=0; i<ol.size(); i++) {
String thisObject = (String)ol.elementAt(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.addElement(thisObject);
}
// Pass two: for files.
for (int fnum=0; fnum<files.size(); fnum++)
curDir.add(new DefaultMutableTreeNode(files.elementAt(fnum)));
return curDir;
| | public java.awt.Dimension | getMinimumSize()
return new Dimension(200, 400);
| | public java.awt.Dimension | getPreferredSize()
return new Dimension(200, 400);
| | public static void | main(java.lang.String[] av)Main: make a Frame, add a FileTree
JFrame frame = new JFrame("FileTree");
frame.setForeground(Color.black);
frame.setBackground(Color.lightGray);
Container cp = frame.getContentPane();
if (av.length == 0) {
cp.add(new FileTree(new File(".")));
} else {
cp.setLayout(new BoxLayout(cp, BoxLayout.X_AXIS));
for (int i=0; i<av.length; i++)
cp.add(new FileTree(new File(av[i])));
}
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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