Windows Explorer in Java

[Parita Patel]

Respected Sir/Madam
this is a project i have attempted to make in java, but i cannot proceed. i can't display all the drives in a PC in the left panel where the tree is created. Also on the selection of the folder i want all it's contents to be displayed on right hand side. please help me out to design something similar to Windows Explorer already exsisting.
i am waiting 4 a quick response on [e-mail]
thanking u. the code is as under...........
*******************************************
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.io.File;
import javax.swing.border.*;

public class Explorer extends Frame {
public Explorer() {
try
{
// UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (Exception exc)
{
System.err.println("Error loading L&F: " + exc);
}
MenuBar mbar = new MenuBar();
setMenuBar(mbar);
Menu file = new Menu("File");
MenuItem item1, item2, item3, item4;
Menu subf=new Menu("New....",true);
MenuItem item11, item12;
subf.add(item11=new MenuItem("Folder"));
subf.add(item12=new MenuItem("Text Document"));
file.add(subf);

item2=new MenuItem("Open");
file.add(item2);
item3=new MenuItem("Close");
file.add(item3);
item4=new MenuItem("Quit....");
//file.add(item4 = new MenuItem("Quit...."));
file.add(item4);

mbar.add(file);
Menu edit = new Menu("Edit");
MenuItem item5,item6, item7, item8,item9;
edit.add(item5 = new MenuItem("Undo"));
edit.add(item6 = new MenuItem("Cut"));
edit.add(item7 = new MenuItem("Copy"));
edit.add(item8 = new MenuItem("Paste"));
edit.add(new MenuItem("-"));
edit.add(item9=new MenuItem("Select All"));
mbar.add(edit);
Menu view = new Menu("View");
MenuItem item20, item14, item15,item16,item17;
Menu subv=new Menu("Explorer Bar.....",true);
MenuItem item10, item13;
subv.add(item10 = new MenuItem("History"));
subv.add(item13 = new MenuItem("Folders"));
view.add(subv);
view.add(new MenuItem("-"));
view.add(item14 = new MenuItem("Large Icons"));
view.add(item15 = new MenuItem("Small Icons"));
view.add(item16 = new MenuItem("List"));
view.add(item17 = new MenuItem("Details"));
view.add(new MenuItem("-"));
Menu subv1=new Menu("Arrange icons.....",true);
MenuItem item18,item19;
subv1.add(item18=new MenuItem("by Name"));
subv1.add(item19=new MenuItem("by Type"));
view.add(subv1);
view.add(new MenuItem("-"));
view.add(item20 = new MenuItem("Refresh"));
mbar.add(view);
Menu go=new Menu("Go");
MenuItem item21,item22,item23;
go.add(item21=new MenuItem("Back"));
go.add(item22=new MenuItem("Forward"));
go.add(new MenuItem("-"));
go.add(item23=new MenuItem("My Computer"));
mbar.add(go);
Menu tools = new Menu("Tools");
MenuItem item24;
tools.add(item24 = new MenuItem("Find(files/folders)"));
mbar.add(tools);
Menu help = new Menu("Help");
MenuItem item25,item26;
help.add(item25 = new MenuItem("Help Topic"));
mbar.add(help);
MyMenuHandler handler = new MyMenuHandler(this);
//item1.addActionListener(handler);
item2.addActionListener(handler);
item3.addActionListener(handler);
item4.addActionListener(handler);
item5.addActionListener(handler);
item6.addActionListener(handler);
item7.addActionListener(handler);
item8.addActionListener(handler);
item9.addActionListener(handler);
item10.addActionListener(handler);
item11.addActionListener(handler);
item12.addActionListener(handler);
item13.addActionListener(handler);
item14.addActionListener(handler);
item15.addActionListener(handler);
item16.addActionListener(handler);
item17.addActionListener(handler);
item18.addActionListener(handler);
item19.addActionListener(handler);
item20.addActionListener(handler);

final JTree tree = new JTree(createTreeModel());
JScrollPane scrollPane = new JScrollPane(tree);
FileNodeRenderer renderer = new FileNodeRenderer();
AbstractBorder border=new EtchedBorder();
tree.setEditable(true);
tree.setCellRenderer(renderer);
// getContentPane().add(scrollPane, BorderLayout.CENTER);
setLayout(new GridLayout(1, 2));
JPanel contentPane=new JPanel();
add(contentPane);
contentPane.setBorder(border);
contentPane.setLayout(new BorderLayout());
contentPane.add(scrollPane, BorderLayout.CENTER);
JPanel contentPane1=new JPanel();
add(contentPane1);
contentPane1.setBorder(border);

MyWindowAdapter adapter = new MyWindowAdapter(this);
addWindowListener(adapter);

tree.addTreeExpansionListener(new TreeExpansionListener(){
public void treeCollapsed(TreeExpansionEvent e) {
}
public void treeExpanded(TreeExpansionEvent e) {
TreePath path = e.getPath();
FileNode node = (FileNode)
path.getLastPathComponent();
if( ! node.isExplored()) {
DefaultTreeModel model =
(DefaultTreeModel)tree.getModel();
node.explore();
model.nodeStructureChanged(node);
}
}
});
}
private DefaultTreeModel createTreeModel() {
String dirname[]={"A:/..","C:/..","D:/..","E:/..","F:/..","G:/.."};
File root = new File("C:/");
FileNode rootNode = new FileNode(root), node;
rootNode.explore();

return new DefaultTreeModel(rootNode);
}
public static void main(String args[]) {
Explorer f = new Explorer();
f.setSize(new Dimension(400,360));
f.setVisible(true);

/* GJApp.launch(new Explorer(),"JTree File Explorer",
300,300,450,400);*/
}
}
class MyWindowAdapter extends WindowAdapter
{
Explorer exp;
public MyWindowAdapter()
{
}
public MyWindowAdapter(Explorer exp)
{
this.exp = exp;
}
public void windowClosing(WindowEvent we)
{
exp.dispose();
System.exit(0);
}
}
class MyMenuHandler implements ActionListener, ItemListener
{
Explorer exp1;
public MyMenuHandler(Explorer exp1)
{
this.exp1 = exp1;
}
public void actionPerformed(ActionEvent ae)
{
}
public void itemStateChanged(ItemEvent ie)
{
}
}

class FileNode extends DefaultMutableTreeNode {
private boolean explored = false, selected = false;
public FileNode(File file) {
setUserObject(file);
}
public boolean getAllowsChildren() { return isDirectory(); }
public boolean isLeaf() { return !isDirectory(); }
public File getFile(){ return (File)getUserObject(); }
public void explore() { explore(false); }
public boolean isExplored() { return explored; }
public void setSelected(boolean s) { selected = s; }
public boolean isSelected() { return selected; }
public boolean isDirectory() {
File file = (File)getUserObject();
return file.isDirectory();
}
public String toString() {
File file = (File)getUserObject();
String filename = file.toString();
int index = filename.lastIndexOf("\\");
return (index != -1 && index != filename.length()-1) ?
filename.substring(index+1) :
filename;
}
public void explore(boolean force) {
if(!isExplored() || force) {
File file = getFile();
File[] children = file.listFiles();
for(int i=0; i < children.length; ++i)
add(new FileNode(children[i]));
explored = true;
}
}
}
class FileNodeRenderer extends DefaultTreeCellRenderer {
// protected JCheckBox checkBox = new JCheckBox("backup");
// private Component strut = Box.createHorizontalStrut(8);
private JPanel panel = new JPanel();
public FileNodeRenderer() {
panel.setBackground(
UIManager.getColor("Tree.textBackground"));

setOpaque(false);
// checkBox.setOpaque(false);
panel.setOpaque(false);
panel.setLayout(new FlowLayout(FlowLayout.CENTER,0,0));
panel.add(this);
// panel.add(strut);
// panel.add(checkBox);
}
public Component getTreeCellRendererComponent(
JTree tree, Object value,
boolean selected, boolean expanded,
boolean leaf, int row,
boolean hasFocus) {
FileNode node = (FileNode)value;
String s = tree.convertValueToText(value, selected,
expanded, leaf, row, hasFocus);
super.getTreeCellRendererComponent(
tree, value, selected, expanded,
leaf, row, hasFocus);
// checkBox.setVisible(node.isDirectory());
// checkBox.setSelected(node.isSelected());
return panel;
}
}

[Jim Yingst]

Please don't post the same question in different forums. Followups can go here. Thanks.
[ April 28, 2003: Message edited by: Jim Yingst ]