Mega Code Archive
Create a lazy file tree
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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
//package org.eclipse.swt.snippets;
/*
* Tree example snippet: create a tree (lazy)
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/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 FileTreeLazy{
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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