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/*
* Copyright (C) 2020 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
#include "InlineLevelBox.h"
#include "InlineLine.h"
#include "InlineRect.h"
#include "LayoutElementBox.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/UniqueRef.h>
namespace WebCore {
namespace Layout {
class BoxGeometry;
class InlineFormattingContext;
class LineBoxBuilder;
class LineBoxVerticalAligner;
// ____________________________________________________________ Line Box
// | --------------------
// | | |
// | ----------------------------------|--------------------|---------- Root Inline Box
// || _____ ___ ___ | |
// || | / \ / \ | Inline Level Box |
// || |_____ | | | | | | ascent
// || | | | | | | |
// ||__|________\___/____\___/_________|____________________|_______ alignment_baseline
// ||
// || descent
// ||_______________________________________________________________
// |________________________________________________________________
// The resulting rectangular area that contains the boxes that form a single line of inline-level content is called a line box.
// https://www.w3.org/TR/css-inline-3/#model
class LineBox {
WTF_MAKE_FAST_ALLOCATED;
public:
LineBox(const Box& rootLayoutBox, InlineLayoutUnit contentLogicalLeft, InlineLayoutUnit contentLogicalWidth, size_t lineIndex, size_t nonSpanningInlineLevelBoxCount);
// Note that the line can have many inline boxes and be "empty" the same time e.g. <div><span></span><span></span></div>
bool hasContent() const { return m_hasContent; }
bool hasInlineBox() const { return m_boxTypes.contains(InlineLevelBox::Type::InlineBox); }
bool hasNonInlineBox() const { return m_boxTypes.containsAny({ InlineLevelBox::Type::AtomicInlineLevelBox, InlineLevelBox::Type::LineBreakBox, InlineLevelBox::Type::GenericInlineLevelBox }); }
bool hasAtomicInlineLevelBox() const { return m_boxTypes.contains(InlineLevelBox::Type::AtomicInlineLevelBox); }
InlineRect logicalRectForTextRun(const Line::Run&) const;
InlineRect logicalRectForLineBreakBox(const Box&) const;
InlineRect logicalRectForRootInlineBox() const { return m_rootInlineBox.logicalRect(); }
InlineRect logicalBorderBoxForAtomicInlineLevelBox(const Box&, const BoxGeometry&) const;
InlineRect logicalBorderBoxForInlineBox(const Box&, const BoxGeometry&) const;
const InlineLevelBox* inlineLevelBoxFor(const Box& layoutBox) const { return const_cast<LineBox&>(*this).inlineLevelBoxFor(layoutBox); }
const InlineLevelBox& inlineLevelBoxFor(const Line::Run& lineRun) const { return const_cast<LineBox&>(*this).inlineLevelBoxFor(lineRun); }
const InlineLevelBox& rootInlineBox() const { return m_rootInlineBox; }
using InlineLevelBoxList = Vector<InlineLevelBox>;
const InlineLevelBoxList& nonRootInlineLevelBoxes() const { return m_nonRootInlineLevelBoxList; }
FontBaseline baselineType() const { return m_baselineType; }
const InlineRect& logicalRect() const { return m_logicalRect; }
size_t lineIndex() const { return m_lineIndex; }
private:
friend class LineBoxBuilder;
friend class LineBoxVerticalAligner;
void addInlineLevelBox(InlineLevelBox&&);
InlineLevelBoxList& nonRootInlineLevelBoxes() { return m_nonRootInlineLevelBoxList; }
InlineLevelBox& rootInlineBox() { return m_rootInlineBox; }
const InlineLevelBox& parentInlineBox(const InlineLevelBox& inlineLevelBox) const { return const_cast<LineBox&>(*this).parentInlineBox(inlineLevelBox); }
InlineLevelBox& parentInlineBox(const InlineLevelBox&);
const InlineLevelBox& parentInlineBox(const Line::Run& lineRun) const { return const_cast<LineBox&>(*this).parentInlineBox(lineRun); }
InlineLevelBox& parentInlineBox(const Line::Run&);
InlineLevelBox& inlineLevelBoxFor(const Line::Run&);
InlineLevelBox* inlineLevelBoxFor(const Box& layoutBox);
InlineRect logicalRectForInlineLevelBox(const Box& layoutBox) const;
void setLogicalRect(const InlineRect& logicalRect) { m_logicalRect = logicalRect; }
void setHasContent(bool hasContent) { m_hasContent = hasContent; }
void setBaselineType(FontBaseline baselineType) { m_baselineType = baselineType; }
InlineLayoutUnit inlineLevelBoxAbsoluteTop(const InlineLevelBox&) const;
private:
size_t m_lineIndex { 0 };
bool m_hasContent { false };
InlineRect m_logicalRect;
OptionSet<InlineLevelBox::Type> m_boxTypes;
FontBaseline m_baselineType { AlphabeticBaseline };
InlineLevelBox m_rootInlineBox;
InlineLevelBoxList m_nonRootInlineLevelBoxList;
HashMap<const Box*, size_t> m_nonRootInlineLevelBoxMap;
};
inline InlineLevelBox* LineBox::inlineLevelBoxFor(const Box& layoutBox)
{
if (&layoutBox == &m_rootInlineBox.layoutBox())
return &m_rootInlineBox;
auto entry = m_nonRootInlineLevelBoxMap.find(&layoutBox);
if (entry == m_nonRootInlineLevelBoxMap.end())
return nullptr;
return &m_nonRootInlineLevelBoxList[entry->value];
}
inline InlineLevelBox& LineBox::parentInlineBox(const InlineLevelBox& inlineLevelBox)
{
return *inlineLevelBoxFor(inlineLevelBox.layoutBox().parent());
}
inline InlineLevelBox& LineBox::parentInlineBox(const Line::Run& lineRun)
{
return *inlineLevelBoxFor(lineRun.layoutBox().parent());
}
inline InlineLevelBox& LineBox::inlineLevelBoxFor(const Line::Run& lineRun)
{
return *inlineLevelBoxFor(lineRun.layoutBox());
}
}
}
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