Source/WebCore/rendering/LegacyInlineFlowBox.h

/*
 * Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#pragma once

#include <WebCore/LegacyInlineBox.h>
#include <WebCore/RenderOverflow.h>

namespace WebCore {

class HitTestRequest;
class HitTestResult;
class LegacyInlineTextBox;
class RenderLineBoxList;
class Font;

struct GlyphOverflow;

typedef HashMap<const LegacyInlineTextBox*, std::pair<Vector<SingleThreadWeakPtr<const Font>>, GlyphOverflow>> GlyphOverflowAndFallbackFontsMap;

class LegacyInlineFlowBox : public LegacyInlineBox {
    WTF_MAKE_TZONE_ALLOCATED(LegacyInlineFlowBox);
public:
    explicit LegacyInlineFlowBox(RenderBoxModelObject& renderer)
        : LegacyInlineBox(renderer)
    {
    }

#if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
    virtual ~LegacyInlineFlowBox();
#endif

#if ENABLE(TREE_DEBUGGING)
    void outputLineTreeAndMark(WTF::TextStream&, const LegacyInlineBox* markedBox, int depth) const override;
    ASCIILiteral boxName() const override;
#endif

    RenderBoxModelObject& renderer() const { return downcast<RenderBoxModelObject>(LegacyInlineBox::renderer()); }
    const RenderStyle& lineStyle() const { return isFirstLine() ? renderer().firstLineStyle() : renderer().style(); }

    LegacyInlineFlowBox* prevLineBox() const { return m_prevLineBox; }
    LegacyInlineFlowBox* nextLineBox() const { return m_nextLineBox; }
    void setNextLineBox(LegacyInlineFlowBox* n) { m_nextLineBox = n; }
    void setPreviousLineBox(LegacyInlineFlowBox* p) { m_prevLineBox = p; }

    LegacyInlineBox* firstChild() const { checkConsistency(); return m_firstChild; }
    LegacyInlineBox* lastChild() const { checkConsistency(); return m_lastChild; }

    bool isLeaf() const final { return false; }
    
    LegacyInlineBox* firstLeafDescendant() const;
    LegacyInlineBox* lastLeafDescendant() const;

    void setConstructed() final
    {
        LegacyInlineBox::setConstructed();
        for (auto* child = firstChild(); child; child = child->nextOnLine())
            child->setConstructed();
    }

    void addToLine(LegacyInlineBox* child);
    void deleteLine() final;
    void adjustPosition(float dx, float dy) override;

    virtual void removeLineBoxFromRenderObject();

    void computeOverflow(LayoutUnit lineTop, LayoutUnit lineBottom, GlyphOverflowAndFallbackFontsMap&);
    
    void removeChild(LegacyInlineBox* child);

    RenderObject::HighlightState selectionState() const override;

    bool hasTextChildren() const { return m_hasTextChildren; }
    bool hasTextDescendants() const { return m_hasTextDescendants; }
    void setHasTextChildren() { m_hasTextChildren = true; setHasTextDescendants(); }
    void setHasTextDescendants() { m_hasTextDescendants = true; }
    
    void checkConsistency() const;
    void setHasBadChildList();

    LayoutRect visualOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
    { 
        return m_overflow ? m_overflow->visualOverflowRect() : enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
    }
    LayoutUnit logicalLeftVisualOverflow() const { return m_overflow ? (isHorizontal() ? m_overflow->visualOverflowRect().x() : m_overflow->visualOverflowRect().y()) : LayoutUnit(logicalLeft()); }
    LayoutUnit logicalRightVisualOverflow() const { return m_overflow ? (isHorizontal() ? m_overflow->visualOverflowRect().maxX() : m_overflow->visualOverflowRect().maxY()) : LayoutUnit(ceilf(logicalRight())); }
    LayoutUnit logicalTopVisualOverflow(LayoutUnit lineTop) const
    {
        if (m_overflow)
            return isHorizontal() ? m_overflow->visualOverflowRect().y() : m_overflow->visualOverflowRect().x();
        return lineTop;
    }
    LayoutUnit logicalBottomVisualOverflow(LayoutUnit lineBottom) const
    {
        if (m_overflow)
            return isHorizontal() ? m_overflow->visualOverflowRect().maxY() : m_overflow->visualOverflowRect().maxX();
        return lineBottom;
    }
    LayoutRect logicalVisualOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
    {
        LayoutRect result = visualOverflowRect(lineTop, lineBottom);
        if (!renderer().isHorizontalWritingMode())
            result = result.transposedRect();
        return result;
    }

    void setOverflowFromLogicalRects(const LayoutRect& logicalVisualOverflow, LayoutUnit lineTop, LayoutUnit lineBottom);
    void setVisualOverflow(const LayoutRect&, LayoutUnit lineTop, LayoutUnit lineBottom);

    FloatRect frameRectIncludingLineHeight(LayoutUnit lineTop, LayoutUnit lineBottom) const
    {
        if (isHorizontal())
            return FloatRect(x(), lineTop, width(), lineBottom - lineTop);
        return FloatRect(lineTop, y(), lineBottom - lineTop, height());
    }
    
    FloatRect logicalFrameRectIncludingLineHeight(LayoutUnit lineTop, LayoutUnit lineBottom) const
    {
        return FloatRect(logicalLeft(), lineTop, logicalWidth(), lineBottom - lineTop);
    }

    bool hasSelfPaintInlineBox() const { return m_hasSelfPaintInlineBox; }

private:
    bool isInlineFlowBox() const final { return true; }
    void boxModelObject() const = delete;

    void addTextBoxVisualOverflow(LegacyInlineTextBox&, GlyphOverflowAndFallbackFontsMap&, LayoutRect& logicalVisualOverflow);

private:
    unsigned m_hasTextChildren : 1 { false };
    unsigned m_hasTextDescendants : 1 { false };

protected:
    // The following members are only used by RootInlineBox but moved here to keep the bits packed.

    // Whether or not this line uses alphabetic or ideographic baselines by default.
    unsigned m_baselineType : 1 { enumToUnderlyingType(FontBaseline::Alphabetic) }; // FontBaseline

    unsigned m_lineBreakBidiStatusEor : 5; // UCharDirection
    unsigned m_lineBreakBidiStatusLastStrong : 5; // UCharDirection
    unsigned m_lineBreakBidiStatusLast : 5; // UCharDirection

    unsigned m_hasSelfPaintInlineBox : 1 { false };

    // End of RootInlineBox-specific members.

#if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
private:
    unsigned m_hasBadChildList : 1 { false };
#endif

protected:
    std::unique_ptr<RenderOverflow> m_overflow;

    LegacyInlineBox* m_firstChild { nullptr };
    LegacyInlineBox* m_lastChild { nullptr };

    LegacyInlineFlowBox* m_prevLineBox { nullptr }; // The previous box that also uses our RenderObject
    LegacyInlineFlowBox* m_nextLineBox { nullptr }; // The next box that also uses our RenderObject
};

#ifdef NDEBUG

inline void LegacyInlineFlowBox::checkConsistency() const
{
}

#endif

#if ASSERT_WITH_SECURITY_IMPLICATION_DISABLED

inline void LegacyInlineFlowBox::setHasBadChildList()
{
}

#endif

} // namespace WebCore

SPECIALIZE_TYPE_TRAITS_INLINE_BOX(LegacyInlineFlowBox, isInlineFlowBox())

#if ENABLE(TREE_DEBUGGING)
// Outside the WebCore namespace for ease of invocation from the debugger.
void showTree(const WebCore::LegacyInlineFlowBox*);
#endif