--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet022ComputedListCombo.d	Sun Apr 19 11:33:55 2009 +0200
@@ -0,0 +1,138 @@
+/*******************************************************************************
+ * Copyright (c) 2008 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.jface.examples.databinding.snippets;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.eclipse.core.databinding.observable.Realm;
+import org.eclipse.core.databinding.observable.list.ComputedList;
+import org.eclipse.core.databinding.observable.list.IObservableList;
+import org.eclipse.core.databinding.observable.list.WritableList;
+import org.eclipse.core.databinding.observable.value.IObservableValue;
+import org.eclipse.jface.databinding.swt.SWTObservables;
+import org.eclipse.jface.databinding.viewers.ObservableListContentProvider;
+import org.eclipse.jface.layout.GridDataFactory;
+import org.eclipse.jface.layout.GridLayoutFactory;
+import org.eclipse.jface.viewers.ComboViewer;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Combo;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Group;
+import org.eclipse.swt.widgets.Shell;
+
+/**
+ * @since 3.2
+ * 
+ */
+public class Snippet022ComputedListCombo {
+	private static WritableList model;
+
+	public static void main(String[] args) {
+		Display display = new Display();
+		final Shell shell = new Shell(display);
+		shell.setLayout(new GridLayout(1, false));
+
+		Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
+			public void run() {
+				Snippet022ComputedListCombo snippet = new Snippet022ComputedListCombo();
+				snippet.createModel();
+				snippet.createControls(shell);
+			}
+		});
+
+		shell.pack();
+		shell.open();
+		while (!shell.isDisposed()) {
+			if (!display.readAndDispatch())
+				display.sleep();
+		}
+		display.dispose();
+	}
+
+	/**
+	 * 
+	 */
+	protected void createModel() {
+		model = new WritableList();
+		model.add(new Thing("Alice", true, false));
+		model.add(new Thing("Beth", true, false));
+		model.add(new Thing("Cathy", true, false));
+		model.add(new Thing("Arthur", false, true));
+		model.add(new Thing("Bob", false, true));
+		model.add(new Thing("Curtis", false, true));
+		model.add(new Thing("Snail", true, true));
+		model.add(new Thing("Nail", false, false));
+	}
+
+	/**
+	 * @param shell
+	 */
+	protected void createControls(Shell shell) {
+		Composite composite = new Composite(shell, SWT.NONE);
+		Group group = new Group(composite, SWT.NONE);
+		group.setText("Filter");
+		Button male = new Button(group, SWT.CHECK);
+		male.setText("Male");
+		Button female = new Button(group, SWT.CHECK);
+		female.setText("Female");
+		final IObservableValue femaleObservable = SWTObservables
+				.observeSelection(female);
+		final IObservableValue maleObservable = SWTObservables
+				.observeSelection(male);
+		Combo combo = new Combo(composite, SWT.DROP_DOWN | SWT.READ_ONLY);
+		GridDataFactory.defaultsFor(combo).align(SWT.BEGINNING, SWT.BEGINNING)
+				.applyTo(combo);
+		ComboViewer viewer = new ComboViewer(combo);
+		viewer.setContentProvider(new ObservableListContentProvider());
+		// We should really have an out-of-the box filtered list...
+		IObservableList filteredList = new ComputedList() {
+			protected List calculate() {
+				ArrayList result = new ArrayList();
+				for (Iterator it = model.iterator(); it.hasNext();) {
+					Thing thing = (Thing) it.next();
+					if (((Boolean) femaleObservable.getValue()).booleanValue()
+							&& !thing.female)
+						continue;
+					if (((Boolean) maleObservable.getValue()).booleanValue()
+							&& !thing.male)
+						continue;
+					result.add(thing);
+				}
+				return result;
+			}
+		};
+		viewer.setInput(filteredList);
+		GridLayoutFactory.swtDefaults().applyTo(group);
+		GridLayoutFactory.swtDefaults().applyTo(composite);
+	}
+
+	static class Thing {
+		String name;
+		boolean male;
+		boolean female;
+
+		public Thing(String name, boolean female, boolean male) {
+			this.name = name;
+			this.female = female;
+			this.male = male;
+		}
+
+		public String toString() {
+			return name;
+		}
+	}
+}