flutter_flutter/sky/engine/core/rendering/RootInlineBox.h

/*
 * Copyright (C) 2003, 2006, 2007, 2008 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.
 *
 */

#ifndef SKY_ENGINE_CORE_RENDERING_ROOTINLINEBOX_H_
#define SKY_ENGINE_CORE_RENDERING_ROOTINLINEBOX_H_

#include "flutter/sky/engine/core/rendering/InlineFlowBox.h"
#include "flutter/sky/engine/platform/text/BidiContext.h"

namespace blink {

class EllipsisBox;
class HitTestResult;
class RenderParagraph;

struct BidiStatus;
struct GapRects;

class RootInlineBox : public InlineFlowBox {
 public:
  explicit RootInlineBox(RenderParagraph&);

  virtual void destroy() override final;

  virtual bool isRootInlineBox() const override final { return true; }

  void detachEllipsisBox();

  RootInlineBox* nextRootBox() const {
    return static_cast<RootInlineBox*>(m_nextLineBox);
  }
  RootInlineBox* prevRootBox() const {
    return static_cast<RootInlineBox*>(m_prevLineBox);
  }

  virtual void adjustPosition(float dx, float dy) override final;

  LayoutUnit lineTop() const { return m_lineTop; }
  LayoutUnit lineBottom() const { return m_lineBottom; }

  LayoutUnit lineTopWithLeading() const { return m_lineTopWithLeading; }
  LayoutUnit lineBottomWithLeading() const { return m_lineBottomWithLeading; }

  LayoutUnit selectionTop() const;
  LayoutUnit selectionBottom() const;
  LayoutUnit selectionHeight() const {
    return max<LayoutUnit>(0, selectionBottom() - selectionTop());
  }

  LayoutUnit selectionTopAdjustedForPrecedingBlock() const;
  LayoutUnit selectionHeightAdjustedForPrecedingBlock() const {
    return max<LayoutUnit>(
        0, selectionBottom() - selectionTopAdjustedForPrecedingBlock());
  }

  int blockDirectionPointInLine() const;

  LayoutUnit alignBoxesInBlockDirection(LayoutUnit heightOfBlock,
                                        GlyphOverflowAndFallbackFontsMap&,
                                        VerticalPositionCache&);
  void setLineTopBottomPositions(
      LayoutUnit top,
      LayoutUnit bottom,
      LayoutUnit topWithLeading,
      LayoutUnit bottomWithLeading,
      LayoutUnit selectionBottom = LayoutUnit::min()) {
    m_lineTop = top;
    m_lineBottom = bottom;
    m_lineTopWithLeading = topWithLeading;
    m_lineBottomWithLeading = bottomWithLeading;
    m_selectionBottom =
        selectionBottom == LayoutUnit::min() ? bottom : selectionBottom;
  }

  virtual RenderLineBoxList* rendererLineBoxes() const override final;

  RenderObject* lineBreakObj() const { return m_lineBreakObj; }
  BidiStatus lineBreakBidiStatus() const;
  void setLineBreakInfo(RenderObject*, unsigned breakPos, const BidiStatus&);

  unsigned lineBreakPos() const { return m_lineBreakPos; }
  void setLineBreakPos(unsigned p) { m_lineBreakPos = p; }

  using InlineBox::endsWithBreak;
  using InlineBox::setEndsWithBreak;

  void childRemoved(InlineBox* box);

  void paintEllipsisBox(PaintInfo&,
                        const LayoutPoint&,
                        LayoutUnit lineTop,
                        LayoutUnit lineBottom,
                        Vector<RenderBox*>& layers) const;

  virtual void clearTruncation() override final;

  virtual int baselinePosition(FontBaseline baselineType) const override final;
  virtual LayoutUnit lineHeight() const override final;

  virtual void paint(PaintInfo&,
                     const LayoutPoint&,
                     LayoutUnit lineTop,
                     LayoutUnit lineBottom,
                     Vector<RenderBox*>& layers) override;
  virtual bool nodeAtPoint(const HitTestRequest&,
                           HitTestResult&,
                           const HitTestLocation& locationInContainer,
                           const LayoutPoint& accumulatedOffset,
                           LayoutUnit lineTop,
                           LayoutUnit lineBottom) override final;

  using InlineBox::hasSelectedChildren;
  using InlineBox::setHasSelectedChildren;

  virtual RenderObject::SelectionState selectionState() override final;
  InlineBox* firstSelectedBox();
  InlineBox* lastSelectedBox();

  GapRects lineSelectionGap(RenderBlock* rootBlock,
                            const LayoutPoint& rootBlockPhysicalPosition,
                            const LayoutSize& offsetFromRootBlock,
                            LayoutUnit selTop,
                            LayoutUnit selHeight,
                            const PaintInfo*);

  RenderParagraph& block() const;

  InlineBox* closestLeafChildForPoint(const IntPoint&, bool onlyEditableLeaves);
  InlineBox* closestLeafChildForLogicalLeftPosition(
      int,
      bool onlyEditableLeaves = false);

  virtual void extractLineBoxFromRenderObject() override final;
  virtual void attachLineBoxToRenderObject() override final;
  virtual void removeLineBoxFromRenderObject() override final;

  FontBaseline baselineType() const {
    return static_cast<FontBaseline>(m_baselineType);
  }

  bool hasAnnotationsBefore() const { return m_hasAnnotationsBefore; }
  bool hasAnnotationsAfter() const { return m_hasAnnotationsAfter; }

  LayoutRect paddedLayoutOverflowRect(LayoutUnit endPadding) const;

  void ascentAndDescentForBox(InlineBox*,
                              GlyphOverflowAndFallbackFontsMap&,
                              int& ascent,
                              int& descent,
                              bool& affectsAscent,
                              bool& affectsDescent) const;
  LayoutUnit verticalPositionForBox(InlineBox*, VerticalPositionCache&);
  bool includeLeadingForBox(InlineBox*) const;
  bool includeFontForBox(InlineBox*) const;
  bool includeGlyphsForBox(InlineBox*) const;
  bool includeMarginForBox(InlineBox*) const;
  bool fitsToGlyphs() const;
  bool includesRootLineBoxFontOrLeading() const;

  LayoutUnit logicalTopVisualOverflow() const {
    return InlineFlowBox::logicalTopVisualOverflow(lineTop());
  }
  LayoutUnit logicalBottomVisualOverflow() const {
    return InlineFlowBox::logicalBottomVisualOverflow(lineBottom());
  }
  LayoutUnit logicalTopLayoutOverflow() const {
    return InlineFlowBox::logicalTopLayoutOverflow(lineTop());
  }
  LayoutUnit logicalBottomLayoutOverflow() const {
    return InlineFlowBox::logicalBottomLayoutOverflow(lineBottom());
  }

  // Used to calculate the underline offset for TextUnderlinePositionUnder.
  float maxLogicalTop() const;

#ifndef NDEBUG
  virtual const char* boxName() const override;
#endif
 private:
  LayoutUnit beforeAnnotationsAdjustment() const;

  // This folds into the padding at the end of InlineFlowBox on 64-bit.
  unsigned m_lineBreakPos;

  // Where this line ended.  The exact object and the position within that
  // object are stored so that we can create an InlineIterator beginning just
  // after the end of this line.
  RenderObject* m_lineBreakObj;
  RefPtr<BidiContext> m_lineBreakContext;

  LayoutUnit m_lineTop;
  LayoutUnit m_lineBottom;
  LayoutUnit m_lineTopWithLeading;
  LayoutUnit m_lineBottomWithLeading;
  LayoutUnit m_selectionBottom;
};

}  // namespace blink

#endif  // SKY_ENGINE_CORE_RENDERING_ROOTINLINEBOX_H_