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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_DEFERRED_TIMELINE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_DEFERRED_TIMELINE_H_
#include "third_party/blink/renderer/core/animation/scroll_snapshot_timeline.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_vector.h"
namespace blink {
class Document;
class CORE_EXPORT DeferredTimeline : public ScrollSnapshotTimeline {
public:
explicit DeferredTimeline(Document*);
AnimationTimeline* ExposedTimeline() override {
return SingleAttachedTimeline();
}
void AttachTimeline(ScrollSnapshotTimeline*);
void DetachTimeline(ScrollSnapshotTimeline*);
void Trace(Visitor*) const override;
protected:
ScrollAxis GetAxis() const override;
TimelineState ComputeTimelineState() const override;
private:
ScrollSnapshotTimeline* SingleAttachedTimeline() {
return (attached_timelines_.size() == 1u) ? attached_timelines_.back().Get()
: nullptr;
}
const ScrollSnapshotTimeline* SingleAttachedTimeline() const {
return const_cast<DeferredTimeline*>(this)->SingleAttachedTimeline();
}
void OnAttachedTimelineChange();
HeapVector<Member<ScrollSnapshotTimeline>> attached_timelines_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_DEFERRED_TIMELINE_H_
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