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/*
* Copyright (C) 2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
#include "FormattingConstraints.h"
#include "InlineContentBreaker.h"
#include "InlineFormattingState.h"
#include "InlineLine.h"
namespace WebCore {
namespace Layout {
class FloatingContext;
struct LineCandidate;
struct UsedConstraints;
class LineBuilder {
public:
LineBuilder(InlineFormattingContext&, FloatingState&, HorizontalConstraints rootHorizontalConstraints, const InlineItems&, std::optional<IntrinsicWidthMode> = std::nullopt);
LineBuilder(const InlineFormattingContext&, const InlineItems&, std::optional<IntrinsicWidthMode>);
struct InlineItemRange {
bool isEmpty() const { return start == end; }
size_t size() const { return end - start; }
size_t start { 0 };
size_t end { 0 };
};
struct PartialContent {
PartialContent(size_t, std::optional<InlineLayoutUnit>);
size_t length { 0 };
std::optional<InlineLayoutUnit> width { };
};
struct PreviousLine {
InlineItemRange range;
bool endsWithLineBreak { false };
TextDirection inlineBaseDirection { TextDirection::LTR };
std::optional<PartialContent> partialOverflowingContent { };
// Content width measured during line breaking (avoid double-measuring).
std::optional<InlineLayoutUnit> trailingOverflowingContentWidth { };
};
using FloatList = Vector<const Box*>;
struct LineContent {
InlineItemRange inlineItemRange;
std::optional<PartialContent> partialOverflowingContent { };
std::optional<InlineLayoutUnit> trailingOverflowingContentWidth;
const FloatList& floats;
bool hasIntrusiveFloat { false };
InlineLayoutUnit lineMarginStart { 0 };
InlineLayoutPoint lineLogicalTopLeft;
InlineLayoutUnit lineLogicalWidth { 0 };
InlineLayoutUnit contentLogicalWidth { 0 };
InlineLayoutUnit contentLogicalRight { 0 };
InlineLayoutUnit hangingContentWidth { 0 };
bool isLastLineWithInlineContent { true };
size_t nonSpanningInlineLevelBoxCount { 0 };
Vector<int32_t> visualOrderList;
TextDirection inlineBaseDirection { TextDirection::LTR };
const Line::RunList& runs;
};
LineContent layoutInlineContent(const InlineItemRange&, const InlineRect& lineLogicalRect, const std::optional<PreviousLine>&);
struct IntrinsicContent {
InlineItemRange inlineItemRange;
InlineLayoutUnit logicalWidth { 0 };
std::optional<PartialContent> partialOverflowingContent { };
const FloatList& floats;
};
IntrinsicContent computedIntrinsicWidth(const InlineItemRange&, const std::optional<PreviousLine>&);
private:
void candidateContentForLine(LineCandidate&, size_t inlineItemIndex, const InlineItemRange& needsLayoutRange, InlineLayoutUnit currentLogicalRight);
size_t nextWrapOpportunity(size_t startIndex, const LineBuilder::InlineItemRange& layoutRange) const;
struct Result {
InlineContentBreaker::IsEndOfLine isEndOfLine { InlineContentBreaker::IsEndOfLine::No };
struct CommittedContentCount {
size_t value { 0 };
bool isRevert { false };
};
CommittedContentCount committedCount { };
size_t partialTrailingContentLength { 0 };
std::optional<InlineLayoutUnit> overflowLogicalWidth { };
};
UsedConstraints initialConstraintsForLine(const InlineRect& initialLineLogicalRect, std::optional<bool> previousLineEndsWithLineBreak) const;
std::optional<HorizontalConstraints> floatConstraints(const InlineRect& lineLogicalRect) const;
void handleFloatContent(const InlineItem&);
Result handleInlineContent(InlineContentBreaker&, const InlineItemRange& needsLayoutRange, const LineCandidate&);
size_t rebuildLine(const InlineItemRange& needsLayoutRange, const InlineItem& lastInlineItemToAdd);
size_t rebuildLineForTrailingSoftHyphen(const InlineItemRange& layoutRange);
void commitPartialContent(const InlineContentBreaker::ContinuousContent::RunList&, const InlineContentBreaker::Result::PartialTrailingContent&);
void initialize(const UsedConstraints&, size_t leadingInlineTextItemIndex, const std::optional<PreviousLine>&);
struct CommittedContent {
size_t inlineItemCount { 0 };
size_t partialTrailingContentLength { 0 };
std::optional<InlineLayoutUnit> overflowLogicalWidth { };
};
CommittedContent placeInlineContent(const InlineItemRange&);
InlineItemRange close(const InlineItemRange& needsLayoutRange, const CommittedContent&);
InlineLayoutUnit inlineItemWidth(const InlineItem&, InlineLayoutUnit contentLogicalLeft) const;
bool isLastLineWithInlineContent(const InlineItemRange& lineRange, size_t lastInlineItemIndex, bool hasPartialTrailingContent) const;
std::optional<IntrinsicWidthMode> intrinsicWidthMode() const { return m_intrinsicWidthMode; }
bool isInIntrinsicWidthMode() const { return !!intrinsicWidthMode(); }
bool isFirstLine() const { return !m_previousLine.has_value(); }
const InlineFormattingContext& formattingContext() const { return m_inlineFormattingContext; }
InlineFormattingState* formattingState() { return m_inlineFormattingState; }
FloatingState* floatingState() { return m_floatingState; }
const FloatingState* floatingState() const { return m_floatingState; }
const ContainerBox& root() const;
const LayoutState& layoutState() const;
private:
std::optional<PreviousLine> m_previousLine { };
std::optional<IntrinsicWidthMode> m_intrinsicWidthMode;
const InlineFormattingContext& m_inlineFormattingContext;
InlineFormattingState* m_inlineFormattingState { nullptr };
FloatingState* m_floatingState { nullptr };
std::optional<HorizontalConstraints> m_rootHorizontalConstraints;
Line m_line;
InlineRect m_lineLogicalRect;
InlineLayoutUnit m_lineMarginStart { 0 };
const InlineItems& m_inlineItems;
FloatList m_floats;
std::optional<InlineTextItem> m_partialLeadingTextItem;
std::optional<InlineLayoutUnit> m_overflowingLogicalWidth;
Vector<const InlineItem*> m_wrapOpportunityList;
Vector<InlineItem> m_lineSpanningInlineBoxes;
unsigned m_successiveHyphenatedLineCount { 0 };
bool m_contentIsConstrainedByFloat { false };
};
inline LineBuilder::PartialContent::PartialContent(size_t length, std::optional<InlineLayoutUnit> width)
: length(length)
, width(width)
{
}
}
}
#endif
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