Rename and refactor ScrollOffsetAnimations to ScrollOffsetAnimationsImpl

cc/animation/scroll_offset_animations_impl.h

+// Copyright (c) 2016 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 CC_ANIMATION_SCROLL_OFFSET_ANIMATIONS_IMPL_H_
+#define CC_ANIMATION_SCROLL_OFFSET_ANIMATIONS_IMPL_H_
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/memory/ref_counted.h"
+#include "cc/animation/animation_delegate.h"
+#include "cc/animation/scroll_offset_animation_curve.h"
+#include "cc/trees/mutator_host_client.h"
+#include "ui/gfx/geometry/scroll_offset.h"
+
+namespace cc {
+
+class AnimationPlayer;
+class AnimationHost;
+class AnimationTimeline;
+class ElementAnimations;
+
+// Contains an AnimationTimeline and its AnimationPlayer that owns the impl
+// only scroll offset animations running on a particular CC Layer.
+// We have just one player for impl-only scroll offset animations. I.e. only
+// one element can have an impl-only scroll offset animation at any given time.
+// Note that this class only exists on the compositor thread.
+class CC_EXPORT ScrollOffsetAnimationsImpl : public AnimationDelegate {
+ public:
+  explicit ScrollOffsetAnimationsImpl(AnimationHost* animation_host);
+
+  ~ScrollOffsetAnimationsImpl() override;
+
+  void ScrollAnimationCreate(ElementId element_id,
+                             const gfx::ScrollOffset& target_offset,
+                             const gfx::ScrollOffset& current_offset);
+
+  bool ScrollAnimationUpdateTarget(ElementId element_id,
+                                   const gfx::Vector2dF& scroll_delta,
+                                   const gfx::ScrollOffset& max_scroll_offset,
+                                   base::TimeTicks frame_monotonic_time);
+
+  void ScrollAnimationAbort(bool needs_completion);
+
+  // AnimationDelegate implementation.
+  void NotifyAnimationStarted(base::TimeTicks monotonic_time,
+                              TargetProperty::Type target_property,
+                              int group) override {}
+  void NotifyAnimationFinished(base::TimeTicks monotonic_time,
+                               TargetProperty::Type target_property,
+                               int group) override;
+  void NotifyAnimationAborted(base::TimeTicks monotonic_time,
+                              TargetProperty::Type target_property,
+                              int group) override {}
+  void NotifyAnimationTakeover(base::TimeTicks monotonic_time,
+                               TargetProperty::Type target_property,
+                               double animation_start_time,
+                               std::unique_ptr<AnimationCurve> curve) override {
+  }
+
+ private:
+  void ReattachScrollOffsetPlayerIfNeeded(ElementId element_id);
+
+  AnimationHost* animation_host_;
+  scoped_refptr<AnimationTimeline> scroll_offset_timeline_;
+
+  // We have just one player for impl-only scroll offset animations.
+  // I.e. only one element can have an impl-only scroll offset animation at
+  // any given time.
+  scoped_refptr<AnimationPlayer> scroll_offset_animation_player_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScrollOffsetAnimationsImpl);
+};
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_SCROLL_OFFSET_ANIMATIONS_IMPL_H_