/*
* 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.maps.client.MapWidget;
import com.google.gwt.maps.client.event.MapMoveEndHandler;
import com.google.gwt.maps.client.geom.LatLng;
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;
/**
* To register an event listener, call the GEvent.addListener method. Pass it a
* map, an event to listen for, and a function to call when the specified event
* occurs. In the following example code, we display the latitude and longitude
* of the center of the map after the user drags the map.
*/
public class EventDemo extends MapsDemo {
private static HTML descHTML =
null;
private static final String descString =
"<p>Creates a 500 x 300 pixel map viewport centered on Palo Alto, CA USA. "
+ "You should be able to scroll the viewport by clicking and dragging "
+ "with the mouse.</p>\n"
+ "<p>Dragging the map fires a MapMoveListener that reports the "
+ "Lat/Lng coordinates below the map.</p>"
+ "<p>Equivalent to the Maps JavaScript API Example: "
+ "<a href=\"http://code.google.com/apis/maps/documentation/examples/event-context.html\">"
+ "http://code.google.com/apis/maps/documentation/examples/event-context.html</a></p>\n";
public static MapsDemoInfo init() {
return new MapsDemoInfo() {
@Override
public MapsDemo createInstance() {
return new EventDemo();
}
@Override
public HTML getDescriptionHTML() {
if (descHTML == null) {
descHTML = new HTML(descString);
}
return descHTML;
}
@Override
public String getName() {
return "Simple Event Handler Demo";
}
};
}
private MapWidget map;
public EventDemo() {
Panel panel =
new FlowPanel();
map =
new MapWidget(LatLng.newInstance(37.4419, -122.1419), 13);
map.setSize("500px", "300px");
map.setUIToDefault();
panel.add(map);
final Label message =
new Label();
panel.add(message);
initWidget(panel);
map.addMapMoveEndHandler(new MapMoveEndHandler() {
public void onMoveEnd(MapMoveEndEvent event) {
message.setText(map.getCenter().toString());
}
});
}
}