/** Constructs the tree path for a directory. */
private TreePath getTreePath(File dir) {
LinkedList<File> files = new LinkedList<File>();
files.add(dir);
File parent = dir.getParentFile();
while (parent != null && !directoryTreeModel.isSubRoot(dir)) {
files.addFirst(parent);
dir = parent;
parent = parent.getParentFile();
}
Object[] path = new Object[files.size() + 1];
path[0] = directoryTreeModel.getRoot();
System.arraycopy(files.toArray(), 0, path, 1, path.length - 1);
return new TreePath(path);
}
/** Expand the visible or invisible root node. */
public void setRootExpanded() {
directoryTree.expandPath(new TreePath(directoryTreeModel.getRoot()));
}