com.google.gwt.animation.client.AnimationSchedulerImplWebkit Maven / Gradle / Ivy
/*
* 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 webkitRequestAnimationFrame and
* webkitCancelRequestAnimationFrame.
*
* @see
* Chromium Web Platform Status
* @see webkit
* draft spec
*/
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);
}-*/;
}