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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GridResolvedPosition_h
#define GridResolvedPosition_h
#include "core/rendering/style/GridPosition.h"
namespace WebCore {
struct GridSpan;
class RenderBox;
class RenderStyle;
enum GridPositionSide {
ColumnStartSide,
ColumnEndSide,
RowStartSide,
RowEndSide
};
enum GridTrackSizingDirection {
ForColumns,
ForRows
};
// This class represents an index into one of the dimensions of the grid array.
// Wraps a size_t integer just for the purpose of knowing what we manipulate in the grid code.
class GridResolvedPosition {
public:
static GridResolvedPosition adjustGridPositionForAfterEndSide(size_t resolvedPosition)
{
return resolvedPosition ? GridResolvedPosition(resolvedPosition - 1) : GridResolvedPosition(0);
}
static GridResolvedPosition adjustGridPositionForSide(size_t resolvedPosition, GridPositionSide side)
{
// An item finishing on the N-th line belongs to the N-1-th cell.
if (side == ColumnEndSide || side == RowEndSide)
return adjustGridPositionForAfterEndSide(resolvedPosition);
return GridResolvedPosition(resolvedPosition);
}
static void initialAndFinalPositionsFromStyle(const RenderStyle&, const RenderBox&, GridTrackSizingDirection, GridPosition &initialPosition, GridPosition &finalPosition);
static GridSpan resolveGridPositionsFromAutoPlacementPosition(const RenderStyle&, const RenderBox&, GridTrackSizingDirection, const GridResolvedPosition&);
static PassOwnPtr<GridSpan> resolveGridPositionsFromStyle(const RenderStyle&, const RenderBox&, GridTrackSizingDirection);
static GridResolvedPosition resolveNamedGridLinePositionFromStyle(const RenderStyle&, const GridPosition&, GridPositionSide);
static GridResolvedPosition resolveGridPositionFromStyle(const RenderStyle&, const GridPosition&, GridPositionSide);
static PassOwnPtr<GridSpan> resolveGridPositionAgainstOppositePosition(const RenderStyle&, const GridResolvedPosition& resolvedOppositePosition, const GridPosition&, GridPositionSide);
static PassOwnPtr<GridSpan> resolveNamedGridLinePositionAgainstOppositePosition(const RenderStyle&, const GridResolvedPosition& resolvedOppositePosition, const GridPosition&, GridPositionSide);
GridResolvedPosition(size_t position)
: m_integerPosition(position)
{
}
GridResolvedPosition(const GridPosition& position, GridPositionSide side)
{
ASSERT(position.integerPosition());
size_t integerPosition = position.integerPosition() - 1;
m_integerPosition = adjustGridPositionForSide(integerPosition, side).toInt();
}
GridResolvedPosition& operator++()
{
m_integerPosition++;
return *this;
}
bool operator==(const GridResolvedPosition& other) const
{
return m_integerPosition == other.m_integerPosition;
}
bool operator!=(const GridResolvedPosition& other) const
{
return m_integerPosition != other.m_integerPosition;
}
bool operator<(const GridResolvedPosition& other) const
{
return m_integerPosition < other.m_integerPosition;
}
bool operator>(const GridResolvedPosition& other) const
{
return m_integerPosition > other.m_integerPosition;
}
bool operator<=(const GridResolvedPosition& other) const
{
return m_integerPosition <= other.m_integerPosition;
}
bool operator>=(const GridResolvedPosition& other) const
{
return m_integerPosition >= other.m_integerPosition;
}
size_t toInt() const
{
return m_integerPosition;
}
GridResolvedPosition next() const
{
return GridResolvedPosition(m_integerPosition + 1);
}
static size_t explicitGridColumnCount(const RenderStyle&);
static size_t explicitGridRowCount(const RenderStyle&);
private:
static size_t explicitGridSizeForSide(const RenderStyle&, GridPositionSide);
size_t m_integerPosition;
};
} // namespace WebCore
#endif // GridResolvedPosition_h
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