cc/animation/layer_animation_value_provider.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_ANIMATION_LAYER_ANIMATION_VALUE_PROVIDER_H_
   6 #define CC_ANIMATION_LAYER_ANIMATION_VALUE_PROVIDER_H_
   7
   8 #include "cc/base/cc_export.h"
   9
  10 namespace gfx {
  11 class ScrollOffset;
  12 }
  13
  14 namespace cc {
  15
  16 // A LayerAnimationValueProvider is used for determining the starting value
  17 // for animations that start at their 'current' value rather than at a
  18 // pre-specified value.
  19 class CC_EXPORT LayerAnimationValueProvider {
  20  public:
  21   virtual ~LayerAnimationValueProvider() {}
  22
  23   virtual gfx::ScrollOffset ScrollOffsetForAnimation() const = 0;
  24 };
  25
  26 }  // namespace cc
  27
  28 #endif  // CC_ANIMATION_LAYER_ANIMATION_VALUE_PROVIDER_H_