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 #include "ui/gfx/vector2d_f.h"
  10
  11 namespace cc {
  12
  13 // A LayerAnimationValueProvider is used for determining the starting value
  14 // for animations that start at their 'current' value rather than at a
  15 // pre-specified value.
  16 class CC_EXPORT LayerAnimationValueProvider {
  17  public:
  18   virtual ~LayerAnimationValueProvider() {}
  19
  20   virtual gfx::Vector2dF ScrollOffsetForAnimation() const = 0;
  21 };
  22
  23 }  // namespace cc
  24
  25 #endif  // CC_ANIMATION_LAYER_ANIMATION_VALUE_PROVIDER_H_