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/*
 * Copyright 2011 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.media.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.AudioElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.PartialSupport;

/**
 * 

* A widget representing an <audio> element. * *

* Experimental API: This API is still under development * and is subject to change. *

* * This widget may not be supported on all browsers. */ @PartialSupport public class Audio extends MediaBase { /** * Detector for permutations that might support {@link AudioElement}. */ @SuppressWarnings("unused") private static class AudioElementSupportDetectedMaybe extends AudioElementSupportDetector { /** * Using a compile-time check, return true if {@link AudioElement} might be * supported. * * @return true if might be supported, false otherwise. */ @Override boolean isSupportedCompileTime() { return true; } } /** * Detector for permutations that do not support {@link AudioElement}. */ @SuppressWarnings("unused") private static class AudioElementSupportDetectedNo extends AudioElementSupportDetector { /** * Using a compile-time check, return true if {@link AudioElement} might be * supported. * * @return true if might be supported, false otherwise. */ @Override boolean isSupportedCompileTime() { return false; } } /** * Detector for browser support of {@link AudioElement}. */ private static class AudioElementSupportDetector { /** * Using a run-time check, return true if the {@link AudioElement} is * supported. * * @return true if supported, false otherwise. */ static native boolean isSupportedRunTime(AudioElement element) /*-{ return !!element.canPlayType; }-*/; /** * Using a compile-time check, return true if {@link AudioElement} might be * supported. * * @return true if might be supported, false otherwise. */ boolean isSupportedCompileTime() { // will be true in AudioElementSupportDetectedMaybe // will be false in AudioElementSupportDetectedNo return false; } } private static AudioElementSupportDetector detector; /** * Return a new {@link Audio} if supported, and null otherwise. * * @return a new {@link Audio} if supported, and null otherwise */ public static Audio createIfSupported() { if (detector == null) { detector = GWT.create(AudioElementSupportDetector.class); } if (!detector.isSupportedCompileTime()) { return null; } AudioElement element = Document.get().createAudioElement(); if (!detector.isSupportedRunTime(element)) { return null; } return new Audio(element); } /** * Runtime check for whether the audio element is supported in this browser. * * @return whether the audio element is supported */ public static boolean isSupported() { if (detector == null) { detector = GWT.create(AudioElementSupportDetector.class); } if (!detector.isSupportedCompileTime()) { return false; } AudioElement element = Document.get().createAudioElement(); if (!detector.isSupportedRunTime(element)) { return false; } return true; } /** * Protected constructor. Use {@link #createIfSupported()} to create an Audio. */ protected Audio(AudioElement element) { super(element); } /** * Returns the attached AudioElement. * * @return the AudioElement */ public AudioElement getAudioElement() { return getMediaElement().cast(); } }




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