/*
* 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.core.client.GWT;
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.geom.LatLng;
import com.google.gwt.maps.client.overlay.GeoXmlLoadCallback;
import com.google.gwt.maps.client.overlay.GeoXmlOverlay;
import com.google.gwt.user.client.Window;
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.Panel;
/**
* The Google Maps API supports the KML and GeoRSS data formats for displaying
* geographic information. These data formats are added to a map using the
* GGeoXml object, whose factory method takes the URL of a publicly accessible
* XML file. GGeoXml placemarks are rendered as markers, while GGeoXml polylines
* and polygons are rendered as Google Maps API polylines and polygons.
* <GroundOverlay> elements within KML files are rendered as
* GGroundOverlay elements on the map.
*
* GeoXmlOverlay objects are added to a map using the
* {@link MapWidget#addOverlay(com.google.gwt.maps.client.overlay.Overlay)}
* method. (You can remove them from the map using
* {@link MapWidget#removeOverlay(com.google.gwt.maps.client.overlay.Overlay)}.)
* Both KML and GeoRSS XML files are supported.
*/
public class GeoRssOverlayDemo extends MapsDemo {
private static HTML descHTML = null;
private static final String descString = "<p>Creates a map view of the "
+ "contents of a Geo RSS file</p>"
+ "<p>Each entry in the RSS file is displayed as a marker.</p>\n"
+ "<p>Equivalent to the Maps JavaScript API Example: "
+ "<a href=\"http://code.google.com/apis/maps/documentation/examples/geoxml-rss.html\">"
+ "http://code.google.com/apis/maps/documentation/examples/geoxml-rss.html</a></p>\n";
public static MapsDemoInfo init() {
return new MapsDemoInfo() {
@Override
public MapsDemo createInstance() {
return new GeoRssOverlayDemo();
}
@Override
public HTML getDescriptionHTML() {
if (descHTML == null) {
descHTML = new HTML(descString);
}
return descHTML;
}
@Override
public String getName() {
return "GeoRSS Overlays";
}
};
}
private GeoXmlOverlay geoXml;
private boolean geoXmlShown;
private MapWidget map;
private Button toggleButton;
public GeoRssOverlayDemo() {
Panel panel = new FlowPanel();
map = new MapWidget(LatLng.newInstance(49.496675, -102.65625), 3);
map.setSize("640px", "480px");
map.setUIToDefault();
panel.add(map);
toggleButton = new Button("Toggle Markers");
toggleButton.setEnabled(false);
toggleButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
if (geoXml == null) {
return;
}
if (geoXmlShown) {
map.removeOverlay(geoXml);
} else {
map.addOverlay(geoXml);
}
geoXmlShown = !geoXmlShown;
}
});
panel.add(toggleButton);
initWidget(panel);
GeoXmlOverlay.load(
"http://api.flickr.com/services/feeds/groups_pool.gne?id=322338@N20&format=rss_200&georss=1",
new GeoXmlLoadCallback() {
@Override
public void onFailure(String url, Throwable e) {
StringBuffer message = new StringBuffer("GeoRss File " + url
+ " failed to load");
if (e != null) {
message.append(e.toString());
}
Window.alert(message.toString());
}
@Override
public void onSuccess(String url, GeoXmlOverlay overlay) {
geoXml = overlay;
toggleButton.setEnabled(true);
map.addOverlay(geoXml);
GWT.log("GeoRss File " + url + "loaded successfully", null);
GWT.log("Default Center=" + geoXml.getDefaultCenter(), null);
GWT.log("Default Span=" + geoXml.getDefaultSpan(), null);
GWT.log("Default Bounds=" + geoXml.getDefaultBounds(), null);
GWT.log("Supports hide=" + geoXml.supportsHide(), null);
}
});
}
@Override
public void onShow() {
map.clearOverlays();
if (geoXml != null) {
map.addOverlay(geoXml);
}
geoXmlShown = true;
}
}