src/third_party/WebKit/Source/core/rendering/style/GridResolvedPosition.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GridResolvedPosition_h
   6 #define GridResolvedPosition_h
   7
   8 #include "core/rendering/style/GridPosition.h"
   9
  10 namespace WebCore {
  11
  12 struct GridSpan;
  13 class RenderBox;
  14 class RenderStyle;
  15
  16 enum GridPositionSide {
  17     ColumnStartSide,
  18     ColumnEndSide,
  19     RowStartSide,
  20     RowEndSide
  21 };
  22
  23 enum GridTrackSizingDirection {
  24     ForColumns,
  25     ForRows
  26 };
  27
  28 // This class represents an index into one of the dimensions of the grid array.
  29 // Wraps a size_t integer just for the purpose of knowing what we manipulate in the grid code.
  30 class GridResolvedPosition {
  31 public:
  32     static GridResolvedPosition adjustGridPositionForAfterEndSide(size_t resolvedPosition)
  33     {
  34         return resolvedPosition ? GridResolvedPosition(resolvedPosition - 1) : GridResolvedPosition(0);
  35     }
  36
  37     static GridResolvedPosition adjustGridPositionForSide(size_t resolvedPosition, GridPositionSide side)
  38     {
  39         // An item finishing on the N-th line belongs to the N-1-th cell.
  40         if (side == ColumnEndSide || side == RowEndSide)
  41             return adjustGridPositionForAfterEndSide(resolvedPosition);
  42
  43         return GridResolvedPosition(resolvedPosition);
  44     }
  45
  46     static GridSpan resolveGridPositionsFromAutoPlacementPosition(const RenderBox&, GridTrackSizingDirection, const GridResolvedPosition&);
  47     static PassOwnPtr<GridSpan> resolveGridPositionsFromStyle(const RenderStyle&, const RenderBox&, GridTrackSizingDirection);
  48     static GridResolvedPosition resolveNamedGridLinePositionFromStyle(const RenderStyle&, const GridPosition&, GridPositionSide);
  49     static GridResolvedPosition resolveGridPositionFromStyle(const RenderStyle&, const GridPosition&, GridPositionSide);
  50     static PassOwnPtr<GridSpan> resolveGridPositionAgainstOppositePosition(const RenderStyle&, const GridResolvedPosition& resolvedOppositePosition, const GridPosition&, GridPositionSide);
  51     static PassOwnPtr<GridSpan> resolveNamedGridLinePositionAgainstOppositePosition(const RenderStyle&, const GridResolvedPosition& resolvedOppositePosition, const GridPosition&, GridPositionSide);
  52
  53     GridResolvedPosition(size_t position)
  54         : m_integerPosition(position)
  55     {
  56     }
  57
  58     GridResolvedPosition(const GridPosition& position, GridPositionSide side)
  59     {
  60         ASSERT(position.integerPosition());
  61         size_t integerPosition = position.integerPosition() - 1;
  62
  63         m_integerPosition = adjustGridPositionForSide(integerPosition, side).toInt();
  64     }
  65
  66     GridResolvedPosition& operator++()
  67     {
  68         m_integerPosition++;
  69         return *this;
  70     }
  71
  72     bool operator==(const GridResolvedPosition& other) const
  73     {
  74         return m_integerPosition == other.m_integerPosition;
  75     }
  76
  77     bool operator!=(const GridResolvedPosition& other) const
  78     {
  79         return m_integerPosition != other.m_integerPosition;
  80     }
  81
  82     bool operator<(const GridResolvedPosition& other) const
  83     {
  84         return m_integerPosition < other.m_integerPosition;
  85     }
  86
  87     bool operator>(const GridResolvedPosition& other) const
  88     {
  89         return m_integerPosition > other.m_integerPosition;
  90     }
  91
  92     bool operator<=(const GridResolvedPosition& other) const
  93     {
  94         return m_integerPosition <= other.m_integerPosition;
  95     }
  96
  97     bool operator>=(const GridResolvedPosition& other) const
  98     {
  99         return m_integerPosition >= other.m_integerPosition;
 100     }
 101
 102     size_t toInt() const
 103     {
 104         return m_integerPosition;
 105     }
 106
 107     GridResolvedPosition next() const
 108     {
 109         return GridResolvedPosition(m_integerPosition + 1);
 110     }
 111
 112     static size_t explicitGridColumnCount(const RenderStyle&);
 113     static size_t explicitGridRowCount(const RenderStyle&);
 114
 115 private:
 116
 117     static size_t explicitGridSizeForSide(const RenderStyle&, GridPositionSide);
 118
 119     size_t m_integerPosition;
 120 };
 121
 122 } // namespace WebCore
 123
 124 #endif // GridResolvedPosition_h