import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.*;

public class TreeShellExample2 {    
        Display d;
        Shell s;
        TreeShellExample2()    {
            d = new Display();
            s = new Shell(d);
            
            s.setSize(250,200);
            s.setImage(new Image(d, "c:\\icons\\JavaCup.ico"));
            s.setText("A Tree Shell Example");
            s.setLayout(new FillLayout(SWT.HORIZONTAL));
            final Tree t = new Tree(s, SWT.SINGLE | SWT.BORDER);
            final TreeItem child1 = new TreeItem(t, SWT.NONE, 0);
            child1.setText("1");
            child1.setImage(new Image(d, "c:\\icons\\folder.gif"));
            final TreeItem child2 = new TreeItem(t, SWT.NONE, 1);
            child2.setText("2");
            child2.setImage(new Image(d, "c:\\icons\\folder.gif"));
            final TreeItem child2a = new TreeItem(child2, SWT.NONE, 0);
            child2a.setText("2A");
            final TreeItem child2b = new TreeItem(child2, SWT.NONE, 1);
            child2b.setText("2B");
            final TreeItem child3 = new TreeItem(t, SWT.NONE, 2);
            child3.setText("3");
            child3.setImage(new Image(d, "c:\\icons\\folder.gif"));
            
            final List l = new List(s, SWT.BORDER | SWT.SINGLE);
            
            t.addTreeListener(new TreeListener() {
                public void treeExpanded(TreeEvent e) {
                    TreeItem ti = (TreeItem)e.item;
                    ti.setImage(new Image(d, "c:\\icons\\open.gif"));
                }
                
                public void treeCollapsed(TreeEvent e) {
                    TreeItem ti = (TreeItem)e.item;
                    ti.setImage(new Image(d, "c:\\icons\\folder.gif"));
                }
            });
            
            t.addSelectionListener(new SelectionAdapter() {
                public void widgetSelected(SelectionEvent e) {
                    TreeItem ti = (TreeItem)e.item;
                    populateList(ti.getText());
                }
                
                private void populateList(String type){
                    if(type.equals("1"))
                    {
                        l.removeAll();
                        l.add("File 1");
                        l.add("File 2");
                    }
                    if(type.equals("2"))
                    {
                        l.removeAll();
                    }
                    if(type.equals("2A"))
                    {
                        l.removeAll();
                        l.add("File 3");
                        l.add("File 4");
                    }
                    if(type.equals("2B"))
                    {
                        l.removeAll();
                        l.add("File 5");
                        l.add("File 6");
                    }
                    if(type.equals("3"))
                    {
                        l.removeAll();
                        l.add("File 7");
                        l.add("File 8");
                    }
                    
                }
            });
            s.open();
            while(!s.isDisposed()){
                if(!d.readAndDispatch())
                    d.sleep();
            }
            d.dispose();
        }
}