com.google.gwt.animation.client.AnimationSchedulerImpl 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.core.client.GWT;
/**
* Base class for animation implementations.
*/
abstract class AnimationSchedulerImpl extends AnimationScheduler {
/**
* The singleton instance of animation scheduler.
*/
static final AnimationScheduler INSTANCE;
static {
AnimationScheduler impl = GWT.create(AnimationScheduler.class);
/*
* If the implementation isn't natively supported, revert back to the timer
* based implementation.
*
* If impl==null (such as with GWTMockUitlities.disarm()), use null. We
* don't want to create a new AnimationSchedulerImplTimer in this case.
*/
if (impl instanceof AnimationSchedulerImpl) {
if (!((AnimationSchedulerImpl) impl).isNativelySupported()) {
impl = new AnimationSchedulerImplTimer();
}
}
INSTANCE = impl;
}
/**
* Check if the implementation is natively supported.
*
* @return true if natively supported, false if not
*/
protected abstract boolean isNativelySupported();
}