--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/util/PropertyChangeEvent.d	Fri Mar 28 17:08:33 2008 +0100
@@ -0,0 +1,112 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.util.PropertyChangeEvent;
+
+import dwtx.core.runtime.Assert;
+
+import dwt.dwthelper.utils;
+
+/**
+ * An event object describing a change to a named property.
+ * <p>
+ * This concrete class was designed to be instantiated, but may
+ * also be subclassed if required.
+ * </p>
+ * <p>
+ * The JFace frameworks contain classes that report property
+ * change events for internal state changes that may be of interest
+ * to external parties. A special listener interface
+ * (<code>IPropertyChangeListener</code>) is defined for this purpose,
+ * and a typical class allow listeners to be registered via
+ * an <code>addPropertyChangeListener</code> method.
+ * </p>
+ *
+ * @see IPropertyChangeListener
+ */
+public class PropertyChangeEvent : EventObject {
+
+    /**
+     * Generated serial version UID for this class.
+     * @since 3.1
+     */
+    private static final long serialVersionUID = 3256726173533811256L;
+
+    /**
+     * The name of the changed property.
+     */
+    private String propertyName;
+
+    /**
+     * The old value of the changed property, or <code>null</code> if
+     * not known or not relevant.
+     */
+    private Object oldValue;
+
+    /**
+     * The new value of the changed property, or <code>null</code> if
+     * not known or not relevant.
+     */
+    private Object newValue;
+
+    /**
+     * Creates a new property change event.
+     *
+     * @param source the object whose property has changed
+     * @param property the property that has changed (must not be <code>null</code>)
+     * @param oldValue the old value of the property, or <code>null</code> if none
+     * @param newValue the new value of the property, or <code>null</code> if none
+     */
+    public this(Object source, String property, Object oldValue,
+            Object newValue) {
+        super(source);
+        Assert.isTrue( property.length > 0 );
+        this.propertyName = property;
+        this.oldValue = oldValue;
+        this.newValue = newValue;
+    }
+
+    /**
+     * Returns the new value of the property.
+     *
+     * @return the new value, or <code>null</code> if not known
+     *  or not relevant (for instance if the property was removed).
+     */
+    public Object getNewValue() {
+        return newValue;
+    }
+
+    /**
+     * Returns the old value of the property.
+     *
+     * @return the old value, or <code>null</code> if not known
+     *  or not relevant (for instance if the property was just
+     *  added and there was no old value).
+     */
+    public Object getOldValue() {
+        return oldValue;
+    }
+
+    /**
+     * Returns the name of the property that changed.
+     * <p>
+     * Warning: there is no guarantee that the property name returned
+     * is a constant string.  Callers must compare property names using
+     * equals, not is.
+     * </p>
+     *
+     * @return the name of the property that changed
+     */
+    public String getProperty() {
+        return propertyName;
+    }
+}