001package gwt.material.design.client.events;
002
003/*
004 * #%L
005 * GwtMaterial
006 * %%
007 * Copyright (C) 2015 GwtMaterialDesign
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 * 
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 * 
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023
024import com.google.gwt.event.shared.EventHandler;
025import com.google.gwt.event.shared.GwtEvent;
026import com.google.gwt.event.shared.HasHandlers;
027
028public class ObservedEvent extends GwtEvent<ObservedEvent.ObservedHandler> {
029
030    public interface ObservedHandler extends EventHandler {
031        void onObserved(ObservedEvent event);
032    }
033
034    public static final Type<ObservedHandler> TYPE = new Type<>();
035
036    private final String old;
037    private final String value;
038
039    public ObservedEvent(String old, String value) {
040        this.old = old;
041        this.value = value;
042    }
043
044    public static void fire(HasHandlers source, String old, String value) {
045        source.fireEvent(new ObservedEvent(old, value));
046    }
047
048    public String getOld() {
049        return old;
050    }
051
052    public String getValue() {
053        return value;
054    }
055
056    @Override
057    public Type<ObservedHandler> getAssociatedType() {
058        return TYPE;
059    }
060
061    @Override
062    protected void dispatch(ObservedHandler handler) {
063        handler.onObserved(this);
064    }
065}