001/*
002 * #%L
003 * GwtMaterial
004 * %%
005 * Copyright (C) 2015 - 2017 GwtMaterialDesign
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 * 
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 * 
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package gwt.material.design.client.events;
021
022import com.google.gwt.event.shared.EventHandler;
023import com.google.gwt.event.shared.GwtEvent;
024import com.google.gwt.event.shared.HasHandlers;
025
026public class ObservedEvent extends GwtEvent<ObservedEvent.ObservedHandler> {
027
028    public interface ObservedHandler extends EventHandler {
029        void onObserved(ObservedEvent event);
030    }
031
032    public static final Type<ObservedHandler> TYPE = new Type<>();
033
034    private final String old;
035    private final String value;
036
037    public ObservedEvent(String old, String value) {
038        this.old = old;
039        this.value = value;
040    }
041
042    public static void fire(HasHandlers source, String old, String value) {
043        source.fireEvent(new ObservedEvent(old, value));
044    }
045
046    public String getOld() {
047        return old;
048    }
049
050    public String getValue() {
051        return value;
052    }
053
054    @Override
055    public Type<ObservedHandler> getAssociatedType() {
056        return TYPE;
057    }
058
059    @Override
060    protected void dispatch(ObservedHandler handler) {
061        handler.onObserved(this);
062    }
063}