com.google.gwt.maps.client.event.StreetviewOverlayChangedHandler.java Source code

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Here is the source code for com.google.gwt.maps.client.event.StreetviewOverlayChangedHandler.java

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/*
 * Copyright 2009 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.maps.client.event;

import com.google.gwt.maps.client.overlay.StreetviewOverlay;

import java.util.EventObject;

/**
 * Provides an interface to implement in order to receive MapEvent.CHANGED
 * events from the {@link StreetviewOverlay}.
 */
public interface StreetviewOverlayChangedHandler {

    /**
     * Encapsulates the arguments for the MapEvent.CHANGED event on a
     * {@link StreetviewOverlay}.
     */
    @SuppressWarnings("serial")
    class StreetviewOverlayChangedEvent extends EventObject {

        final boolean hasStreetviewData;

        public StreetviewOverlayChangedEvent(StreetviewOverlay source, boolean hasStreetviewData) {
            super(source);
            this.hasStreetviewData = hasStreetviewData;
        }

        /**
         * Returns the instance of the overlay that generated this event.
         * 
         * @return the instance of the overlay that generated this event.
         */
        public StreetviewOverlay getSender() {
            return (StreetviewOverlay) getSource();
        }

        /**
         * Returns <code>true</code> if the viewport contains Street View data and
         * false otherwise. The event works regardless of whether the layer is
         * hidden or shown.
         * 
         * @return <code>true</code> if the viewport contains Street View data and
         *         false otherwise.
         */
        public boolean hasStreetviewData() {
            return hasStreetviewData;
        }
    }

    /**
     * Method to be invoked when a MapEvent.CHANGED event fires on a
     * {@link StreetviewOverlay}.
     * 
     * @param event contains the properties of the event.
     */
    void onChanged(StreetviewOverlayChangedEvent event);
}