| /* |
| * 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.animation.client; |
| |
| import com.google.gwt.dom.client.Element; |
| |
| /** |
| * Implementation using <code>webkitRequestAnimationFrame</code> and |
| * <code>webkitCancelRequestAnimationFrame</code>. |
| * |
| * @see <a |
| * href="http://www.chromium.org/developers/web-platform-status#TOC-requestAnimationFrame"> |
| * Chromium Web Platform Status</a> |
| * @see <a href="http://webstuff.nfshost.com/anim-timing/Overview.html"> webkit |
| * draft spec</a> |
| */ |
| class AnimationSchedulerImplWebkit extends AnimationSchedulerImpl { |
| |
| /** |
| * Webkit implementation of {@link AnimationScheduler.AnimationHandle}. Webkit |
| * provides the request ID as a double. |
| */ |
| private class AnimationHandleImpl extends AnimationHandle { |
| private final double requestId; |
| |
| public AnimationHandleImpl(double requestId) { |
| this.requestId = requestId; |
| } |
| |
| @Override |
| public void cancel() { |
| cancelAnimationFrameImpl(requestId); |
| } |
| } |
| |
| @Override |
| public AnimationHandle requestAnimationFrame(AnimationCallback callback, Element element) { |
| double requestId = requestAnimationFrameImpl(callback, element); |
| return new AnimationHandleImpl(requestId); |
| } |
| |
| @Override |
| protected native boolean isNativelySupported() /*-{ |
| return !!($wnd.webkitRequestAnimationFrame && $wnd.webkitCancelRequestAnimationFrame); |
| }-*/; |
| |
| private native void cancelAnimationFrameImpl(double requestId) /*-{ |
| $wnd.webkitCancelRequestAnimationFrame(requestId); |
| }-*/; |
| |
| private native double requestAnimationFrameImpl(AnimationCallback callback, Element element) /*-{ |
| var _callback = callback; |
| var wrapper = $entry(function() { |
| // Older versions of Chrome pass the current timestamp, but newer versions pass a |
| // high resolution timer. We normalize on the current timestamp. |
| var now = @com.google.gwt.core.client.Duration::currentTimeMillis()(); |
| _callback.@com.google.gwt.animation.client.AnimationScheduler.AnimationCallback::execute(D)(now); |
| }); |
| return $wnd.webkitRequestAnimationFrame(wrapper, element); |
| }-*/; |
| } |