Compass.java

/*
 * 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.client;

import java.util.Date;

import com.google.gwt.core.client.JavaScriptObject;

public class Compass {
	
	public static native void getCurrentHeading(Callback callback) /*-{
		$wnd.navigator.compass.getCurrentHeading(function(heading) {
	    	callback.@com.gwtmobile.phonegap.client.Compass.Callback::onSuccess(Lcom/gwtmobile/phonegap/client/Compass$CompassHeading;)(heading);
	    }, function() {
	    	callback.@com.gwtmobile.phonegap.client.Compass.Callback::onError()();
	    });
	}-*/;

    public static String watchHeading(Callback callback) {
    	return watchHeading(callback, null);
	}
	
    public final static native String watchHeading(Callback callback, Options options) /*-{
	    var id = $wnd.navigator.compass.watchHeading(function(heading) {
	    	callback.@com.gwtmobile.phonegap.client.Compass.Callback::onSuccess(Lcom/gwtmobile/phonegap/client/Compass$CompassHeading;)(heading);
	    }, function() {
	    	callback.@com.gwtmobile.phonegap.client.Compass.Callback::onError()();
	    }, options);
	    return id;
	}-*/;

	public static native void clearWatch(String watchId) /*-{
		$wnd.navigator.compass.clearWatch(watchId);
	}-*/;
        

    public interface Callback {
    	void onSuccess(CompassHeading heading);
    	void onError();
    }
    
    public static class Options extends JavaScriptObject {

    	protected Options() {};

    	public static Options newInstance() {
    		return (Options) JavaScriptObject.createObject();
    	}
    	
    	public final native Options frequency(int f) /*-{
    		this.frequency = f;
    		return this;
    	}-*/;
    	
    }

    public static class CompassHeading extends JavaScriptObject {

    	protected CompassHeading() {}
    	
    	public native final double getMagneticHeading() /*-{
    		return this.magneticHeading;
    	}-*/;
    	
    	public native final double getTrueHeading() /*-{
			return this.trueHeading;
		}-*/;
	
    	public native final double getHeadingAccuracy() /*-{
			return this.headingAccuracy;
		}-*/;

    	public final Date getTimestamp() {
			return new Date((long) getTimestampNative());
		}

    	private native final double getTimestampNative() /*-{
			return this.timestamp;
		}-*/;
	
    }

}