1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
// Copyright 2017 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_VIEW_TIMELINE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_VIEW_TIMELINE_H_
#include "base/time/time.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_typedefs.h"
#include "third_party/blink/renderer/core/animation/scroll_timeline.h"
#include "third_party/blink/renderer/core/animation/timeline_inset.h"
#include "third_party/blink/renderer/core/animation/timeline_range.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/layout_box.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
namespace blink {
class ViewTimelineOptions;
// Implements the ViewTimeline from the Scroll-linked Animations spec.
//
// A ViewTimeline is a special form of ScrollTimeline in which the start and
// end scroll offsets are derived based on relative offset of the subject view
// within the source scroll container.
//
// TODO(crbug.com/1329159): Update link once rewrite replaces the draft version.
// https://drafts.csswg.org/scroll-animations-1/rewrite#viewtimeline-interface
class CORE_EXPORT ViewTimeline : public ScrollTimeline {
DEFINE_WRAPPERTYPEINFO();
public:
static ViewTimeline* Create(Document&, ViewTimelineOptions*, ExceptionState&);
ViewTimeline(Document*, Element* subject, ScrollAxis axis, TimelineInset);
bool IsViewTimeline() const override { return true; }
CSSNumericValue* getCurrentTime(const String& rangeName) override;
// IDL API implementation.
Element* subject() const;
bool Matches(Element* subject, ScrollAxis, const TimelineInset&) const;
const TimelineInset& GetInset() const;
CSSNumericValue* startOffset() const;
CSSNumericValue* endOffset() const;
void Trace(Visitor*) const override;
double ToFractionalOffset(const TimelineOffset& timeline_offset) const;
protected:
void CalculateOffsets(PaintLayerScrollableArea* scrollable_area,
ScrollOrientation physical_orientation,
TimelineState* state) const override;
private:
std::optional<gfx::SizeF> SubjectSize() const;
std::optional<gfx::PointF> SubjectPosition(LayoutBox* scroll_container) const;
void ApplyStickyAdjustments(ScrollOffsets& scroll_offsets,
ViewOffsets& view_offsets,
double viewport_size,
double target_size,
double target_offset,
ScrollOrientation orientation,
LayoutBox* scroll_container) const;
TimelineInset inset_;
// If either of the following elements are non-null, we need to update
// |inset_| on a style change.
Member<const CSSValue> style_dependant_start_inset_;
Member<const CSSValue> style_dependant_end_inset_;
};
template <>
struct DowncastTraits<ViewTimeline> {
static bool AllowFrom(const AnimationTimeline& value) {
return value.IsViewTimeline();
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_VIEW_TIMELINE_H_
|
