| /* |
| * 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(); |
| } |