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timeline_offset.cc
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timeline_offset.cc
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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.
#include "third_party/blink/renderer/core/animation/timeline_offset.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_timeline_range_offset.h"
#include "third_party/blink/renderer/core/css/css_identifier_value.h"
#include "third_party/blink/renderer/core/css/css_primitive_value_mappings.h"
#include "third_party/blink/renderer/core/css/css_to_length_conversion_data.h"
#include "third_party/blink/renderer/core/css/css_value_list.h"
#include "third_party/blink/renderer/core/css/cssom/css_numeric_value.h"
#include "third_party/blink/renderer/core/css/parser/css_parser_token_range.h"
#include "third_party/blink/renderer/core/css/parser/css_tokenizer.h"
#include "third_party/blink/renderer/core/css/properties/computed_style_utils.h"
#include "third_party/blink/renderer/core/css/properties/css_parsing_utils.h"
#include "third_party/blink/renderer/core/css/resolver/element_resolve_context.h"
#include "third_party/blink/renderer/core/css/style_sheet_contents.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
namespace blink {
namespace {
void ThrowExceptionForInvalidTimelineOffset(ExceptionState& exception_state) {
exception_state.ThrowTypeError(
"Animation range must be a name <length-percent> pair");
}
} // anonymous namespace
/* static */
String TimelineOffset::TimelineRangeNameToString(
TimelineOffset::NamedRange range_name) {
switch (range_name) {
case NamedRange::kNone:
return "none";
case NamedRange::kCover:
return "cover";
case NamedRange::kContain:
return "contain";
case NamedRange::kEntry:
return "entry";
case NamedRange::kEntryCrossing:
return "entry-crossing";
case NamedRange::kExit:
return "exit";
case NamedRange::kExitCrossing:
return "exit-crossing";
}
}
String TimelineOffset::ToString() const {
CSSValueList* list = CSSValueList::CreateSpaceSeparated();
if (name != NamedRange::kNone) {
list->Append(*MakeGarbageCollected<CSSIdentifierValue>(name));
}
list->Append(*CSSValue::Create(offset, 1));
return list->CssText();
}
bool TimelineOffset::UpdateOffset(Element* element, CSSValue* value) {
Length new_offset = ResolveLength(element, value);
if (new_offset != offset) {
offset = new_offset;
return true;
}
return false;
}
/* static */
absl::optional<TimelineOffset> TimelineOffset::Create(
Element* element,
String css_text,
double default_percent,
ExceptionState& exception_state) {
if (!element) {
exception_state.ThrowDOMException(
DOMExceptionCode::kInvalidStateError,
"Unable to parse TimelineOffset from CSS text with a null effect or "
"target");
return absl::nullopt;
}
Document& document = element->GetDocument();
CSSTokenizer tokenizer(css_text);
Vector<CSSParserToken, 32> tokens = tokenizer.TokenizeToEOF();
CSSParserTokenRange range(tokens);
range.ConsumeWhitespace();
const CSSValue* value = css_parsing_utils::ConsumeAnimationRange(
range, *document.ElementSheet().Contents()->ParserContext(),
/* default_offset_percent */ default_percent);
if (!value || !range.AtEnd()) {
ThrowExceptionForInvalidTimelineOffset(exception_state);
return absl::nullopt;
}
if (IsA<CSSIdentifierValue>(value)) {
DCHECK_EQ(CSSValueID::kNormal, To<CSSIdentifierValue>(*value).GetValueID());
return absl::nullopt;
}
const auto& list = To<CSSValueList>(*value);
DCHECK(list.length());
NamedRange range_name = NamedRange::kNone;
Length offset = Length::Percent(default_percent);
absl::optional<String> style_dependent_offset_str;
if (list.Item(0).IsIdentifierValue()) {
range_name = To<CSSIdentifierValue>(list.Item(0)).ConvertTo<NamedRange>();
if (list.length() == 2u) {
const CSSValue* css_offset_value = &list.Item(1);
offset = ResolveLength(element, css_offset_value);
if (IsStyleDependent(css_offset_value)) {
style_dependent_offset_str = css_offset_value->CssText();
}
}
} else {
const CSSValue* css_offset_value = &list.Item(0);
offset = ResolveLength(element, css_offset_value);
if (IsStyleDependent(css_offset_value)) {
style_dependent_offset_str = css_offset_value->CssText();
}
}
return TimelineOffset(range_name, offset, style_dependent_offset_str);
}
/* static */
absl::optional<TimelineOffset> TimelineOffset::Create(
Element* element,
const V8UnionStringOrTimelineRangeOffset* range_offset,
double default_percent,
ExceptionState& exception_state) {
if (range_offset->IsString()) {
return Create(element, range_offset->GetAsString(), default_percent,
exception_state);
}
TimelineRangeOffset* value = range_offset->GetAsTimelineRangeOffset();
NamedRange name =
value->hasRangeName() ? value->rangeName().AsEnum() : NamedRange::kNone;
Length parsed_offset;
absl::optional<String> style_dependent_offset_str;
if (value->hasOffset()) {
CSSNumericValue* offset = value->offset();
const CSSPrimitiveValue* css_value =
DynamicTo<CSSPrimitiveValue>(offset->ToCSSValue());
if (!css_value || (!css_value->IsPx() && !css_value->IsPercentage() &&
!css_value->IsCalculatedPercentageWithLength())) {
exception_state.ThrowTypeError(
"CSSNumericValue must be a length or percentage for animation "
"range.");
return absl::nullopt;
}
if (css_value->IsPx()) {
parsed_offset = Length::Fixed(css_value->GetDoubleValue());
} else if (css_value->IsPercentage()) {
parsed_offset = Length::Percent(css_value->GetDoubleValue());
} else {
DCHECK(css_value->IsCalculatedPercentageWithLength());
parsed_offset = TimelineOffset::ResolveLength(element, css_value);
style_dependent_offset_str = css_value->CssText();
}
} else {
parsed_offset = Length::Percent(default_percent);
}
return TimelineOffset(name, parsed_offset, style_dependent_offset_str);
}
/* static */
bool TimelineOffset::IsStyleDependent(const CSSValue* value) {
const CSSPrimitiveValue* primitive_value =
DynamicTo<CSSPrimitiveValue>(value);
if (!primitive_value) {
return true;
}
if (primitive_value->IsPercentage()) {
return false;
}
if (primitive_value->IsPx()) {
return false;
}
return true;
}
/* static */
Length TimelineOffset::ResolveLength(Element* element, const CSSValue* value) {
if (auto* primitive_value = DynamicTo<CSSPrimitiveValue>(value)) {
if (primitive_value->IsPercentage()) {
return Length::Percent(primitive_value->GetDoubleValue());
}
if (primitive_value->IsPx()) {
return Length::Fixed(primitive_value->GetDoubleValue());
}
}
// Elements without the computed style don't have a layout box,
// so the timeline will be inactive.
// See ScrollTimeline::IsResolved.
if (!element->GetComputedStyle()) {
return Length::Fixed();
}
ElementResolveContext element_resolve_context(*element);
Document& document = element->GetDocument();
CSSToLengthConversionData::Flags ignored_flags = 0;
CSSToLengthConversionData length_conversion_data(
element->ComputedStyleRef(), element_resolve_context.ParentStyle(),
element_resolve_context.RootElementStyle(), document.GetLayoutView(),
CSSToLengthConversionData::ContainerSizes(element),
element->GetComputedStyle()->EffectiveZoom(), ignored_flags);
return DynamicTo<CSSPrimitiveValue>(value)->ConvertToLength(
length_conversion_data);
}
/* static */
CSSValue* TimelineOffset::ParseOffset(Document* document, String css_text) {
if (!document) {
return nullptr;
}
CSSTokenizer tokenizer(css_text);
Vector<CSSParserToken, 32> tokens = tokenizer.TokenizeToEOF();
CSSParserTokenRange range(tokens);
range.ConsumeWhitespace();
CSSValue* value = css_parsing_utils::ConsumeLengthOrPercent(
range, *document->ElementSheet().Contents()->ParserContext(),
CSSPrimitiveValue::ValueRange::kAll);
if (!range.AtEnd()) {
return nullptr;
}
return value;
}
} // namespace blink