Rename and refactor ScrollOffsetAnimations to ScrollOffsetAnimationsImpl

cc/animation/scroll_offset_animations_impl.cc

+// Copyright 2013 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.
+
+#include "cc/animation/scroll_offset_animations_impl.h"
+
+#include "cc/animation/animation_events.h"
+#include "cc/animation/animation_host.h"
+#include "cc/animation/animation_id_provider.h"
+#include "cc/animation/animation_player.h"
+#include "cc/animation/animation_timeline.h"
+#include "cc/animation/element_animations.h"
+#include "cc/animation/timing_function.h"
+
+namespace cc {
+
+ScrollOffsetAnimationsImpl::ScrollOffsetAnimationsImpl(
+    AnimationHost* animation_host)
+    : animation_host_(animation_host),
+      scroll_offset_timeline_(
+          AnimationTimeline::Create(AnimationIdProvider::NextTimelineId())),
+      scroll_offset_animation_player_(
+          AnimationPlayer::Create(AnimationIdProvider::NextPlayerId())) {
+  scroll_offset_timeline_->set_is_impl_only(true);
+  scroll_offset_animation_player_->set_animation_delegate(this);
+
+  animation_host_->AddAnimationTimeline(scroll_offset_timeline_.get());
+  scroll_offset_timeline_->AttachPlayer(scroll_offset_animation_player_.get());
+}
+
+ScrollOffsetAnimationsImpl::~ScrollOffsetAnimationsImpl() {
+  scroll_offset_timeline_->DetachPlayer(scroll_offset_animation_player_.get());
+  animation_host_->RemoveAnimationTimeline(scroll_offset_timeline_.get());
+}
+
+void ScrollOffsetAnimationsImpl::ScrollAnimationCreate(
+    ElementId element_id,
+    const gfx::ScrollOffset& target_offset,
+    const gfx::ScrollOffset& current_offset) {
+  std::unique_ptr<ScrollOffsetAnimationCurve> curve =
+      ScrollOffsetAnimationCurve::Create(
+          target_offset, EaseInOutTimingFunction::Create(),
+          ScrollOffsetAnimationCurve::DurationBehavior::INVERSE_DELTA);
+  curve->SetInitialValue(current_offset);
+
+  std::unique_ptr<Animation> animation = Animation::Create(
+      std::move(curve), AnimationIdProvider::NextAnimationId(),
+      AnimationIdProvider::NextGroupId(), TargetProperty::SCROLL_OFFSET);
+  animation->set_is_impl_only(true);
+
+  DCHECK(scroll_offset_animation_player_);
+  DCHECK(scroll_offset_animation_player_->animation_timeline());
+
+  ReattachScrollOffsetPlayerIfNeeded(element_id);
+
+  scroll_offset_animation_player_->AddAnimation(std::move(animation));
+}
+
+bool ScrollOffsetAnimationsImpl::ScrollAnimationUpdateTarget(
+    ElementId element_id,
+    const gfx::Vector2dF& scroll_delta,
+    const gfx::ScrollOffset& max_scroll_offset,
+    base::TimeTicks frame_monotonic_time) {
+  DCHECK(scroll_offset_animation_player_);
+  if (!scroll_offset_animation_player_->element_animations())
+    return false;
+
+  DCHECK_EQ(element_id, scroll_offset_animation_player_->element_id());
+
+  Animation* animation =
+      scroll_offset_animation_player_->element_animations()->GetAnimation(
+          TargetProperty::SCROLL_OFFSET);
+  if (!animation) {
+    scroll_offset_animation_player_->DetachElement();
+    return false;
+  }
+
+  ScrollOffsetAnimationCurve* curve =
+      animation->curve()->ToScrollOffsetAnimationCurve();
+
+  gfx::ScrollOffset new_target =
+      gfx::ScrollOffsetWithDelta(curve->target_value(), scroll_delta);
+  new_target.SetToMax(gfx::ScrollOffset());
+  new_target.SetToMin(max_scroll_offset);
+
+  curve->UpdateTarget(
+      animation->TrimTimeToCurrentIteration(frame_monotonic_time).InSecondsF(),
+      new_target);
+
+  return true;
+}
+
+void ScrollOffsetAnimationsImpl::ScrollAnimationAbort(bool needs_completion) {
+  DCHECK(scroll_offset_animation_player_);
+  scroll_offset_animation_player_->AbortAnimations(
+      TargetProperty::SCROLL_OFFSET, needs_completion);
+}
+
+void ScrollOffsetAnimationsImpl::NotifyAnimationFinished(
+    base::TimeTicks monotonic_time,
+    TargetProperty::Type target_property,
+    int group) {
+  DCHECK_EQ(target_property, TargetProperty::SCROLL_OFFSET);
+  DCHECK(animation_host_->mutator_host_client());
+  animation_host_->mutator_host_client()->ScrollOffsetAnimationFinished();
+}
+
+void ScrollOffsetAnimationsImpl::ReattachScrollOffsetPlayerIfNeeded(
+    ElementId element_id) {
+  if (scroll_offset_animation_player_->element_id() != element_id) {
+    if (scroll_offset_animation_player_->element_id())
+      scroll_offset_animation_player_->DetachElement();
+    if (element_id)
+      scroll_offset_animation_player_->AttachElement(element_id);
+  }
+}
+
+}  // namespace cc