com.google.gwt.animation.client.AnimationSchedulerImplStandard Maven / Gradle / Ivy
/*
* Copyright 2013 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.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Element;
/**
* {@link AnimationScheduler} implementation that uses standard {@code requestAnimationFrame} API.
*/
class AnimationSchedulerImplStandard extends AnimationScheduler {
/**
* Check if the implementation is natively supported.
*
* @return {@code true} if natively supported, {@code false} if not
*/
static native boolean isNativelySupported() /*-{
return !!$wnd.requestAnimationFrame && !!$wnd.cancelAnimationFrame;
}-*/;
@Override
public AnimationHandle requestAnimationFrame(AnimationCallback callback, Element element) {
final JavaScriptObject handle = requestImpl(callback, element);
return new AnimationHandle() {
@Override public void cancel() {
cancelImpl(handle);
}
};
}
private static native JavaScriptObject requestImpl(AnimationCallback cb, Element element) /*-{
var callback = $entry(function() {
var time = @com.google.gwt.core.client.Duration::currentTimeMillis()();
cb.@com.google.gwt.animation.client.AnimationScheduler.AnimationCallback::execute(D)(time);
});
var handle = $wnd.requestAnimationFrame(callback, element);
// We can not treat handle as JSO in dev-mode if it is a number. Ensure that it is not:
return {id: handle};
}-*/;
private static native void cancelImpl(JavaScriptObject holder) /*-{
$wnd.cancelAnimationFrame(holder.id);
}-*/;
}