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// Copyright 2020 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_OFFSET_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_SCROLL_TIMELINE_OFFSET_H_
#include "third_party/blink/renderer/bindings/core/v8/v8_scroll_timeline_element_based_offset.h"
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/css/properties/css_parsing_utils.h"
#include "third_party/blink/renderer/core/scroll/scroll_types.h"
namespace blink {
class
CSSNumericValueOrStringOrCSSKeywordValueOrScrollTimelineElementBasedOffset;
using ScrollTimelineOffsetValue =
CSSNumericValueOrStringOrCSSKeywordValueOrScrollTimelineElementBasedOffset;
// Represent a scroll timeline start/end offset which can be an
// scroll offset or an element based offset
class CORE_EXPORT ScrollTimelineOffset final
: public GarbageCollected<ScrollTimelineOffset> {
public:
static ScrollTimelineOffset* Create(const ScrollTimelineOffsetValue& offset);
// Create a default offset representing 'auto'.
ScrollTimelineOffset() = default;
// Create a scroll based offset.
explicit ScrollTimelineOffset(const CSSPrimitiveValue*);
// Create an element based offset.
explicit ScrollTimelineOffset(ScrollTimelineElementBasedOffset*);
void Trace(blink::Visitor*) const;
// Resolves this offset against the scroll source and in the given orientation
// returning eqiuvalent concrete scroll offset.
//
// - Length-based values are converted into concrete length values resolving
// percentages and zoom factor.
// - Element-based values are resolved to the equivalent scroll offset that
// satisfy the requirement.
// - Auto value simply returns the |detfault_offset|.
//
// max offset is expected to be the maximum scroll offset in the scroll
// orientation.
//
// Returns nullopt if the offset cannot be resolved.
base::Optional<double> ResolveOffset(Node* scroll_source,
ScrollOrientation,
double max_offset,
double default_offset);
ScrollTimelineOffsetValue ToScrollTimelineOffsetValue() const;
bool IsDefaultValue() const {
return !length_based_offset_ && !element_based_offset_;
}
bool operator==(const ScrollTimelineOffset&) const;
bool operator!=(const ScrollTimelineOffset& o) const { return !(*this == o); }
private:
// We either have an scroll or element based offset so at any time one of
// these is null. If both are null, it represents the default value of
// 'auto'.
Member<const CSSPrimitiveValue> length_based_offset_;
Member<ScrollTimelineElementBasedOffset> element_based_offset_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_SCROLL_TIMELINE_OFFSET_H_
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