/*
* Copyright 2008 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.sample.hellomaps.client;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.maps.client.MapWidget;
import com.google.gwt.maps.client.event.TrafficOverlayChangedHandler;
import com.google.gwt.maps.client.geom.LatLng;
import com.google.gwt.maps.client.overlay.TrafficOverlay;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Panel;
import java.util.Date;
/**
* The Google Maps API now allows you to add traffic information to your maps.
* Traffic information is displayed using the GTrafficOverlay, which implements
* the GOverlay interface. You add traffic information to your map using the
* Map.addOverlay() method. GTrafficOverlay has two methods (hide() and show())
* for toggling display of the traffic overlay. Traffic information is displayed
* only for supported cities.
*/
public class TrafficOverlayDemo extends MapsDemo {
private static HTML descHTML = null;
private static final String descString = "<p>Displays a map centered on Brooklyn, NY USA</p>"
+ "<p>The Google traffic service is called and retrieves an overlay "
+ "representing current traffic conditions. Pressing the 'Toggle Traffic' "
+ "button will alternately hide and show the overlay.</p>"
+ "<p>Equivalent to the Maps JavaScript API Example: "
+ "<a href=\"http://code.google.com/apis/maps/documentation/examples/trafficOverlay.html\">"
+ "http://code.google.com/apis/maps/documentation/examples/trafficOverlay.html</a></p>\n";
public static MapsDemoInfo init() {
return new MapsDemoInfo() {
@Override
public MapsDemo createInstance() {
return new TrafficOverlayDemo();
}
@Override
public HTML getDescriptionHTML() {
if (descHTML == null) {
descHTML = new HTML(descString);
}
return descHTML;
}
@Override
public String getName() {
return "Traffic Overlays";
}
};
}
private MapWidget map;
private TrafficOverlay trafficInfo;
private boolean trafficShown;
public TrafficOverlayDemo() {
Panel panel = new FlowPanel();
map = new MapWidget(LatLng.newInstance(40.652513, -73.936615), 12);
map.setSize("640px", "480px");
panel.add(map);
Button toggleTraffic = new Button("Toggle Traffic");
toggleTraffic.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
if (trafficShown) {
map.removeOverlay(trafficInfo);
} else {
map.addOverlay(trafficInfo);
}
trafficShown = !trafficShown;
}
});
panel.add(toggleTraffic);
final Label changeLabel = new Label();
panel.add(changeLabel);
initWidget(panel);
trafficInfo = new TrafficOverlay();
trafficInfo.addTrafficOverlayChangedHandler(new TrafficOverlayChangedHandler() {
public void onChanged(TrafficOverlayChangedEvent event) {
changeLabel.setText("Last Changed: " + new Date());
}
});
}
@Override
public void onShow() {
map.clearOverlays();
map.addOverlay(trafficInfo);
trafficShown = true;
}
// TODO(zundel): Add handler for event "changed"
}