Source Code : Create a SWT tree (lazy)

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Create a SWT tree (lazy)

/*
 * Tree example snippet: create a tree (lazy)
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import java.io.File;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;

public class Snippet8 {

  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Lazy Tree");
    shell.setLayout(new FillLayout());
    final Tree tree = new Tree(shell, SWT.BORDER);
    File[] roots = File.listRoots();
    for (int i = 0; i < roots.length; i++) {
      TreeItem root = new TreeItem(tree, 0);
      root.setText(roots[i].toString());
      root.setData(roots[i]);
      new TreeItem(root, 0);
    }
    tree.addListener(SWT.Expand, new Listener() {
      public void handleEvent(final Event event) {
        final TreeItem root = (TreeItem) event.item;
        TreeItem[] items = root.getItems();
        for (int i = 0; i < items.length; i++) {
          if (items[i].getData() != null)
            return;
          items[i].dispose();
        }
        File file = (File) root.getData();
        File[] files = file.listFiles();
        if (files == null)
          return;
        for (int i = 0; i < files.length; i++) {
          TreeItem item = new TreeItem(root, 0);
          item.setText(files[i].getName());
          item.setData(files[i]);
          if (files[i].isDirectory()) {
            new TreeItem(item, 0);
          }
        }
      }
    });
    Point size = tree.computeSize(300, SWT.DEFAULT);
    int width = Math.max(300, size.x);
    int height = Math.max(300, size.y);
    shell.setSize(shell.computeSize(width, height));
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}


           
       

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