Hi, I am creating an application where I want to show a file system. I have never worked with them before, so i am not sure on what I need to do to accomplish my goal. So far I found a script through google that lists all the files and folders. What I want to do is modified the script to only show just the folders, then when the user clicks on the folder, I want to populate another object (maybe JList), with only images(jpg,bmp, tiff,png,gif) that are in the folder the user clicked. Any ideas??!?!? Thanks
Code:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.io.File;
import java.util.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.filechooser.FileSystemView;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeNode;
public class FileTreePanel extends JPanel {
protected static FileSystemView fsv = FileSystemView.getFileSystemView();
private static class FileTreeCellRenderer extends DefaultTreeCellRenderer {
private Map<String, Icon> iconCache = new HashMap<String, Icon>();
private Map<File, String> rootNameCache = new HashMap<File, String>();
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
FileTreeNode ftn = (FileTreeNode) value;
File file = ftn.file;
String filename = "";
if (file != null) {
if (ftn.isFileSystemRoot) {
filename = this.rootNameCache.get(file);
if (filename == null) {
filename = fsv.getSystemDisplayName(file);
this.rootNameCache.put(file, filename);
}
} else {
filename = file.getName();
}
}
JLabel result = (JLabel) super.getTreeCellRendererComponent(tree,
filename, sel, expanded, leaf, row, hasFocus);
if (file != null) {
Icon icon = this.iconCache.get(filename);
if (icon == null) {
// System.out.println("Getting icon of " + filename);
icon = fsv.getSystemIcon(file);
this.iconCache.put(filename, icon);
}
result.setIcon(icon);
}
return result;
}
}
private static class FileTreeNode implements TreeNode {
private File file;
private File[] children;
private TreeNode parent;
private boolean isFileSystemRoot;
public FileTreeNode(File file, boolean isFileSystemRoot, TreeNode parent) {
this.file = file;
this.isFileSystemRoot = isFileSystemRoot;
this.parent = parent;
this.children = this.file.listFiles();
if (this.children == null)
this.children = new File[0];
}
public FileTreeNode(File[] children) {
this.file = null;
this.parent = null;
this.children = children;
}
public Enumeration<?> children() {
final int elementCount = this.children.length;
return new Enumeration<File>() {
int count = 0;
public boolean hasMoreElements() {
return this.count < elementCount;
}
public File nextElement() {
if (this.count < elementCount) {
return FileTreeNode.this.children[this.count++];
}
throw new NoSuchElementException("Vector Enumeration");
}
};
}
public boolean getAllowsChildren() {
return true;
}
public TreeNode getChildAt(int childIndex) {
return new FileTreeNode(this.children[childIndex],
this.parent == null, this);
}
public int getChildCount() {
return this.children.length;
}
public int getIndex(TreeNode node) {
FileTreeNode ftn = (FileTreeNode) node;
for (int i = 0; i < this.children.length; i++) {
if (ftn.file.equals(this.children[i]))
return i;
}
return -1;
}
public TreeNode getParent() {
return this.parent;
}
public boolean isLeaf() {
return (this.getChildCount() == 0);
}
}
private JTree tree;
public FileTreePanel() {
this.setLayout(new BorderLayout());
File[] roots = File.listRoots();
FileTreeNode rootTreeNode = new FileTreeNode(roots);
this.tree = new JTree(rootTreeNode);
this.tree.setCellRenderer(new FileTreeCellRenderer());
this.tree.setRootVisible(false);
final JScrollPane jsp = new JScrollPane(this.tree);
jsp.setBorder(new EmptyBorder(0, 0, 0, 0));
this.add(jsp, BorderLayout.CENTER);
}
}
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