/* Copyright (c) 2010 Zhihua (Dennis) Jiang
*
* 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.gwtmobile.phonegap.kitchensink.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Widget;
import com.gwtmobile.phonegap.client.Compass;
import com.gwtmobile.phonegap.client.Compass.Callback;
import com.gwtmobile.phonegap.client.Compass.Options;
import com.gwtmobile.ui.client.event.SelectionChangedEvent;
import com.gwtmobile.ui.client.page.Page;
public class CompassUi extends Page {
@UiField HTML text;
String watchId;
private static CompassUiUiBinder uiBinder = GWT
.create(CompassUiUiBinder.class);
interface CompassUiUiBinder extends UiBinder<Widget, CompassUi> {
}
public CompassUi() {
initWidget(uiBinder.createAndBindUi(this));
}
@Override
protected void onUnload() {
clearWatch();
super.onUnload();
}
@UiHandler("list")
void onListSelectionChanged(SelectionChangedEvent e) {
switch (e.getSelection()) {
case 0:
getCurrentHeading();
break;
case 1:
watchHeading();
break;
case 2:
clearWatch();
break;
}
}
public void getCurrentHeading() {
Compass.getCurrentHeading(new Callback() {
@Override
public void onSuccess(float heading) {
text.setHTML("Current Heading:<br/>" + heading);
}
@Override
public void onError() {
text.setText("Error");
}
});
}
public void watchHeading() {
watchId = Compass.watchHeading(new Callback() {
@Override
public void onSuccess(float heading) {
text.setHTML("Watch Heading:<br/>" + heading);
}
@Override
public void onError() {
text.setHTML("Error");
}
}, new Options().frequency(100));
}
public void clearWatch() {
if (watchId != null) {
Compass.clearWatch(watchId);
text.setText("");
watchId = null;
}
}
}