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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.Document;
import com.google.gwt.dom.client.VideoElement;

/**
 * 

* A widget representing a <video> element. * *

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

* * This widget may not be supported on all browsers. */ public class Video extends MediaBase { /** * Detector for permutations that might support {@link VideoElement}. */ @SuppressWarnings("unused") private static class VideoElementSupportDetectedMaybe extends VideoElementSupportDetector { /** * Using a compile-time check, return true if {@link VideoElement} might be * supported. * * @return true if might be supported, false otherwise. */ @Override boolean isSupportedCompileTime() { return true; } } /** * Detector for permutations that do not support {@link VideoElement}. */ @SuppressWarnings("unused") private static class VideoElementSupportDetectedNo extends VideoElementSupportDetector { /** * Using a compile-time check, return true if {@link VideoElement} might be * supported. * * @return true if might be supported, false otherwise. */ @Override boolean isSupportedCompileTime() { return false; } } /** * Detector for browser support of {@link VideoElement}. */ private static class VideoElementSupportDetector { /** * Using a run-time check, return true if the {@link VideoElement} is * supported. * * @return true if supported, false otherwise. */ static native boolean isSupportedRunTime(VideoElement element) /*-{ return !!element.canPlayType; }-*/; /** * Using a compile-time check, return true if {@link VideoElement} might be * supported. * * @return true if might be supported, false otherwise. */ boolean isSupportedCompileTime() { // will be true in VideoElementSupportDetectedMaybe // will be false in VideoElementSupportDetectedNo return false; } } private static VideoElementSupportDetector detector; /** * Return a new {@link Video} if supported, and null otherwise. * * @return a new {@link Video} if supported, and null otherwise */ public static Video createIfSupported() { if (detector == null) { detector = GWT.create(VideoElementSupportDetector.class); } if (!detector.isSupportedCompileTime()) { return null; } VideoElement element = Document.get().createVideoElement(); if (!detector.isSupportedRunTime(element)) { return null; } return new Video(element); } /** * Runtime check for whether the video element is supported in this browser. * * @return whether the video element is supported */ public static boolean isSupported() { if (detector == null) { detector = GWT.create(VideoElementSupportDetector.class); } if (!detector.isSupportedCompileTime()) { return false; } VideoElement element = Document.get().createVideoElement(); if (!detector.isSupportedRunTime(element)) { return false; } return true; } /** * Protected constructor. Use {@link #createIfSupported()} to create a Video. */ protected Video(VideoElement element) { super(element); } /** * Creates a Video widget with a given source URL. * * @param src a String URL. * @deprecated use {@link #createIfSupported()}. */ @Deprecated public Video(String src) { super(Document.get().createVideoElement()); getMediaElement().setSrc(src); } /** * Returns a poster URL. * * @return a URL containing a poster image * * @see #setPoster(String) */ public String getPoster() { return getVideoElement().getPoster(); } /** * Returns the attached VideoElement. * * @return the VideoElement */ public VideoElement getVideoElement() { return getMediaElement().cast(); } /** * Gets the intrinsic height of video within the element. * * To get the element height, use {@link VideoElement#getOffsetHeight()} * * @return the height, in pixels */ public int getVideoHeight() { return getVideoElement().getVideoHeight(); } /** * Gets the instrinsic width of the video within the element. * * To get the element width, use {@link VideoElement#getOffsetWidth()} * * @return the width, in pixels */ public int getVideoWidth() { return getVideoElement().getVideoWidth(); } /** * Sets the poster URL. * * @param url the poster image URL * @see #getPoster */ public void setPoster(String url) { getVideoElement().setPoster(url); } }




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