Java by API/org.eclipse.swt.events/TreeListener

implements TreeListener

   <source lang="java">

import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.TreeEvent; import org.eclipse.swt.events.TreeListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.List; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; public class MainClass {

 public static void main(String[] a) {
   final Display d = new Display();
   final Shell s = new Shell(d);
   s.setSize(250, 200);
   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");
   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");
   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("1");
         l.add("2");
       }
       if (type.equals("2")) {
         l.removeAll();
       }
       if (type.equals("2A")) {
         l.removeAll();
         l.add("3");
         l.add("4");
       }
       if (type.equals("2B")) {
         l.removeAll();
         l.add("5");
         l.add("6");
       }
       if (type.equals("3")) {
         l.removeAll();
         l.add("7");
         l.add("8");
       }
     }
   });
   s.open();
   while (!s.isDisposed()) {
     if (!d.readAndDispatch())
       d.sleep();
   }
   d.dispose();
 }

}

      </source>