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// Copyright 2016 The Chromium Authors
// 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 <memory>
#include "base/memory/raw_ptr.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/vector2d_f.h"
namespace cc {
class Animation;
class AnimationHost;
class AnimationTimeline;
// This class represents a scroll offset animation that is managed by only the
// impl thread, i.e. an impl-only scroll animation. It contains an
// AnimationTimeline and owns the (impl-only) scroll offset Animation running
// on a particular CC Layer. It exists only on the compositor thread.
class CC_ANIMATION_EXPORT ScrollOffsetAnimationImpl : public AnimationDelegate {
public:
explicit ScrollOffsetAnimationImpl(AnimationHost* animation_host);
ScrollOffsetAnimationImpl(const ScrollOffsetAnimationImpl&) = delete;
~ScrollOffsetAnimationImpl() override;
ScrollOffsetAnimationImpl& operator=(const ScrollOffsetAnimationImpl&) =
delete;
void AutoScrollAnimationCreate(ElementId element_id,
const gfx::PointF& target_offset,
const gfx::PointF& current_offset,
float autoscroll_velocity,
base::TimeDelta animation_start_offset);
// |delayed_by| shrinks the duration of the
// animation. |animation_start_offset| causes us to start the animation
// partway through.
void MouseWheelScrollAnimationCreate(ElementId element_id,
const gfx::PointF& target_offset,
const gfx::PointF& current_offset,
base::TimeDelta delayed_by,
base::TimeDelta animation_start_offset);
std::optional<gfx::PointF> ScrollAnimationUpdateTarget(
const gfx::Vector2dF& scroll_delta,
const gfx::PointF& max_scroll_offset,
base::TimeTicks frame_monotonic_time,
base::TimeDelta delayed_by);
// AnimationDelegate implementation.
void NotifyAnimationStarted(base::TimeTicks monotonic_time,
int target_property,
int group) override {}
void NotifyAnimationFinished(base::TimeTicks monotonic_time,
int target_property,
int group) override;
void NotifyAnimationAborted(base::TimeTicks monotonic_time,
int target_property,
int group) override {}
void NotifyAnimationTakeover(
base::TimeTicks monotonic_time,
int target_property,
base::TimeTicks animation_start_time,
std::unique_ptr<gfx::AnimationCurve> curve) override {}
void NotifyLocalTimeUpdated(
std::optional<base::TimeDelta> local_time) override {}
// Aborts the currently running scroll offset animation on an element and
// starts a new one offsetted by adjustment.
void ScrollAnimationApplyAdjustment(ElementId element_id,
const gfx::Vector2dF& adjustment);
void ScrollAnimationAbort(bool needs_completion);
void AnimatingElementRemovedByCommit();
bool IsAnimating() const;
bool IsAutoScrolling() const;
ElementId GetElementId() const;
private:
void ScrollAnimationCreateInternal(ElementId element_id,
std::unique_ptr<gfx::AnimationCurve> curve,
base::TimeDelta animation_start_offset);
void ReattachScrollOffsetAnimationIfNeeded(ElementId element_id);
raw_ptr<AnimationHost> animation_host_;
scoped_refptr<AnimationTimeline> scroll_offset_timeline_;
scoped_refptr<Animation> scroll_offset_animation_;
bool animation_is_autoscroll_ = false;
};
// Pre-MultiImplScrollAnimations:
// Contains an ScrollOffsetAnimationImpl which encapsulates the scroll offset
// animation running on a particular CC Layer.
// We have just one animation for impl-only scroll offset animations. I.e. only
// one element can have an impl-only scroll offset animation at any given time.
//
// Post-MultiImplScrollAnimations:
// Contains a map from ElementId to ScrollOffsetAnimationImpl that owns the impl
// only scroll offset animation running on a particular CC Layer.
//
// Note that this class only exists on the compositor thread.
class CC_ANIMATION_EXPORT ScrollOffsetAnimationsImpl {
public:
explicit ScrollOffsetAnimationsImpl(AnimationHost* animation_host);
ScrollOffsetAnimationsImpl(const ScrollOffsetAnimationsImpl&) = delete;
~ScrollOffsetAnimationsImpl();
ScrollOffsetAnimationsImpl& operator=(const ScrollOffsetAnimationsImpl&) =
delete;
void AutoScrollAnimationCreate(ElementId element_id,
const gfx::PointF& target_offset,
const gfx::PointF& current_offset,
float autoscroll_velocity,
base::TimeDelta animation_start_offset);
// |delayed_by| shrinks the duration of the
// animation. |animation_start_offset| causes us to start the animation
// partway through.
void MouseWheelScrollAnimationCreate(ElementId element_id,
const gfx::PointF& target_offset,
const gfx::PointF& current_offset,
base::TimeDelta delayed_by,
base::TimeDelta animation_start_offset);
std::optional<gfx::PointF> ScrollAnimationUpdateTarget(
const gfx::Vector2dF& scroll_delta,
const gfx::PointF& max_scroll_offset,
base::TimeTicks frame_monotonic_time,
base::TimeDelta delayed_by,
ElementId element_id);
// Aborts the currently running scroll offset animation on an element and
// starts a new one offsetted by adjustment.
void ScrollAnimationApplyAdjustment(ElementId element_id,
const gfx::Vector2dF& adjustment);
void ScrollAnimationAbort(bool needs_completion, ElementId element_id);
void HandleRemovedScrollAnimatingElements(bool commits_to_active);
bool ElementHasImplOnlyScrollAnimation(ElementId element_id) const;
bool HasImplOnlyScrollAnimatingElement() const;
bool HasImplOnlyAutoScrollAnimatingElement() const;
bool IsAnimating() const;
bool IsAutoScrolling() const;
ElementId GetElementId() const;
private:
// This retrieves the ScrollOffsetAnimationImpl object associated with the
// given ElementId. It is only used when MultiImplScrollAnimations is enabled.
ScrollOffsetAnimationImpl* GetScrollAnimation(ElementId element_id) const;
raw_ptr<AnimationHost> animation_host_;
// We have just one animation for impl-only scroll offset animations.
// I.e. only one element can have an impl-only scroll offset animation at
// any given time.
std::unique_ptr<ScrollOffsetAnimationImpl> scroll_offset_animation_;
// This maps each animating scroll container's ElementId to a
// ScrollOffsetAnimationImpl object. It is only used when
// MultiImplScrollAnimations is enabled.
base::flat_map<ElementId, std::unique_ptr<ScrollOffsetAnimationImpl>>
element_to_animation_map_;
};
} // namespace cc
#endif // CC_ANIMATION_SCROLL_OFFSET_ANIMATIONS_IMPL_H_
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