/*
* 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.MapUIOptions;
import com.google.gwt.maps.client.MapWidget;
import com.google.gwt.maps.client.event.MapClickHandler;
import com.google.gwt.maps.client.geom.LatLng;
import com.google.gwt.maps.client.overlay.Marker;
import com.google.gwt.maps.client.overlay.Overlay;
import com.google.gwt.user.client.ui.HTML;
/**
* To trigger an action when a user clicks the map, register a listener for the
* "click" event on your Map instance. When the event is triggered, the event
* handler will receive two arguments: the marker that was clicked (if any), and
* the GLatLng of the clicked point. If no marker was clicked, the first
* argument will be null. Note: Markers are the only built-in overlay that
* supports the "click" event. Other types of overlays, like GPolyline, are not
* clickable.
*
* In the following example, when the visitor clicks a point on the map without
* a marker, we create a new marker at that point. When the visitor clicks a
* marker, we remove it from the map.
*/
public class ClickDemo 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. " + "</p>\n"
+ "<p>Each time the mouse is clicked in this demo, a new marker is "
+ "placed on the map at the point there the click event occurred.</p>";
public static MapsDemoInfo init() {
return new MapsDemoInfo() {
@Override
public MapsDemo createInstance() {
return new ClickDemo();
}
@Override
public HTML getDescriptionHTML() {
if (descHTML == null) {
descHTML = new HTML(descString);
}
return descHTML;
}
@Override
public String getName() {
return "Click Handling";
}
};
}
private final MapWidget map;
public ClickDemo() {
map = new MapWidget(LatLng.newInstance(37.4419, -122.1419), 13);
map.setSize("500px", "300px");
initWidget(map);
// Workaround for bug with click handler & setUItoDefaults() - see issue 260
MapUIOptions opts = map.getDefaultUI();
opts.setDoubleClick(false);
map.setUI(opts);
map.addMapClickHandler(new MapClickHandler() {
public void onClick(MapClickEvent e) {
MapWidget sender = e.getSender();
Overlay overlay = e.getOverlay();
LatLng point = e.getLatLng();
if (overlay != null && overlay instanceof Marker) {
sender.removeOverlay(overlay);
} else {
sender.addOverlay(new Marker(point));
}
}
});
}
}