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// Copyright 2017 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 THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_SCROLL_TIMELINE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_SCROLL_TIMELINE_H_
#include "third_party/blink/renderer/core/animation/animation_timeline.h"
#include "third_party/blink/renderer/core/animation/scroll_timeline_options.h"
#include "third_party/blink/renderer/core/animation/timing.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/css/css_primitive_value.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
// Implements the ScrollTimeline concept from the Scroll-linked Animations spec.
//
// A ScrollTimeline is a special form of AnimationTimeline whose time values are
// not determined by wall-clock time but instead the progress of scrolling in a
// scroll container. The user is able to specify which scroll container to
// track, the direction of scroll they care about, and various attributes to
// control the conversion of scroll amount to time output.
//
// Spec: https://wicg.github.io/scroll-animations/#scroll-timelines
class CORE_EXPORT ScrollTimeline final : public AnimationTimeline {
DEFINE_WRAPPERTYPEINFO();
public:
enum ScrollDirection {
Block,
Inline,
Horizontal,
Vertical,
};
static ScrollTimeline* Create(Document&,
ScrollTimelineOptions*,
ExceptionState&);
ScrollTimeline(Element*,
ScrollDirection,
CSSPrimitiveValue*,
CSSPrimitiveValue*,
double,
Timing::FillMode);
// AnimationTimeline implementation.
double currentTime(bool& is_null) final;
bool IsScrollTimeline() const override { return true; }
// ScrollTimeline is not active if scrollSource is null, does not currently
// have a CSS layout box, or if its layout box is not a scroll container.
// https://github.com/WICG/scroll-animations/issues/31
bool IsActive() const override;
// IDL API implementation.
Element* scrollSource();
String orientation();
String startScrollOffset();
String endScrollOffset();
void timeRange(DoubleOrScrollTimelineAutoKeyword&);
String fill();
// Returns the Node that should actually have the ScrollableArea (if one
// exists). This can differ from |scrollSource| when |scroll_source_| is the
// Document's scrollingElement, and it may be null if the document was removed
// before the ScrollTimeline was created.
Node* ResolvedScrollSource() const { return resolved_scroll_source_; }
ScrollDirection GetOrientation() const { return orientation_; }
Timing::FillMode GetFillMode() const { return fill_; }
void GetCurrentAndMaxOffset(const LayoutBox*,
double& current_offset,
double& max_offset) const;
void ResolveScrollStartAndEnd(const LayoutBox*,
double max_offset,
double& resolved_start_scroll_offset,
double& resolved_end_scroll_offset) const;
// Must be called when this ScrollTimeline is attached/detached from an
// animation.
void AttachAnimation();
void DetachAnimation();
void Trace(blink::Visitor*) override;
// For the AnimationWorklet origin trial, we need to automatically composite
// elements that are targets of ScrollTimelines (http://crbug.com/776533). We
// expose a static lookup method to enable this.
//
// TODO(crbug.com/839341): Remove once WorkletAnimations can run on main.
static bool HasActiveScrollTimeline(Node* node);
private:
// Use |scroll_source_| only to implement the web-exposed API but use
// resolved_scroll_source_ to actually access the scroll related properties.
Member<Element> scroll_source_;
Member<Node> resolved_scroll_source_;
ScrollDirection orientation_;
Member<CSSPrimitiveValue> start_scroll_offset_;
Member<CSSPrimitiveValue> end_scroll_offset_;
double time_range_;
Timing::FillMode fill_;
};
DEFINE_TYPE_CASTS(ScrollTimeline,
AnimationTimeline,
value,
value->IsScrollTimeline(),
value.IsScrollTimeline());
} // namespace blink
#endif
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