sky/engine/public/platform/WebCompositorAnimation.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SKY_ENGINE_PUBLIC_PLATFORM_WEBCOMPOSITORANIMATION_H_
#define SKY_ENGINE_PUBLIC_PLATFORM_WEBCOMPOSITORANIMATION_H_

#define WEB_ANIMATION_SUPPORTS_FRACTIONAL_ITERATIONS 1

namespace blink {

// A compositor driven animation.
class WebCompositorAnimation {
public:
    enum TargetProperty {
        TargetPropertyTransform = 0,
        TargetPropertyOpacity,
        TargetPropertyFilter,
        TargetPropertyScrollOffset
    };

    virtual ~WebCompositorAnimation() { }

    // An id is effectively the animation's name, and it is not unique.
    virtual int id() = 0;

    virtual TargetProperty targetProperty() const = 0;

    // This is the number of times that the animation will play. If this
    // value is zero the animation will not play. If it is negative, then
    // the animation will loop indefinitely.
    virtual double iterations() const = 0;
    virtual void setIterations(double) = 0;

    virtual double startTime() const = 0;
    virtual void setStartTime(double monotonicTime) = 0;

    virtual double timeOffset() const = 0;
    virtual void setTimeOffset(double monotonicTime) = 0;

    // If alternatesDirection is true, on odd numbered iterations we reverse the curve.
    virtual bool alternatesDirection() const = 0;
    virtual void setAlternatesDirection(bool) = 0;
};

} // namespace blink

#endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBCOMPOSITORANIMATION_H_