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/*
* Copyright (C) 2013 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#ifndef GridCoordinate_h
#define GridCoordinate_h
#include "core/rendering/style/GridPosition.h"
#include "wtf/HashMap.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
// A span in a single direction (either rows or columns). Note that |initialPositionIndex|
// and |finalPositionIndex| are grid areas' indexes, NOT grid lines'. Iterating over the
// span should include both |initialPositionIndex| and |finalPositionIndex| to be correct.
struct GridSpan {
static PassOwnPtr<GridSpan> create(size_t initialPosition, size_t finalPosition)
{
return adoptPtr(new GridSpan(initialPosition, finalPosition));
}
static PassOwnPtr<GridSpan> createWithSpanAgainstOpposite(size_t resolvedOppositePosition, const GridPosition& position, GridPositionSide side)
{
// 'span 1' is contained inside a single grid track regardless of the direction.
// That's why the CSS span value is one more than the offset we apply.
size_t positionOffset = position.spanPosition() - 1;
if (side == ColumnStartSide || side == RowStartSide) {
size_t initialResolvedPosition = std::max<int>(0, resolvedOppositePosition - positionOffset);
return GridSpan::create(initialResolvedPosition, resolvedOppositePosition);
}
return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition + positionOffset);
}
static PassOwnPtr<GridSpan> createWithNamedSpanAgainstOpposite(size_t resolvedOppositePosition, const GridPosition& position, GridPositionSide side, const Vector<size_t>& gridLines)
{
if (side == RowStartSide || side == ColumnStartSide)
return createWithInitialNamedSpanAgainstOpposite(resolvedOppositePosition, position, gridLines);
return createWithFinalNamedSpanAgainstOpposite(resolvedOppositePosition, position, gridLines);
}
static PassOwnPtr<GridSpan> createWithInitialNamedSpanAgainstOpposite(size_t resolvedOppositePosition, const GridPosition& position, const Vector<size_t>& gridLines)
{
// The grid line inequality needs to be strict (which doesn't match the after / end case) because |resolvedOppositePosition|
// is already converted to an index in our grid representation (ie one was removed from the grid line to account for the side).
size_t firstLineBeforeOppositePositionIndex = 0;
const size_t* firstLineBeforeOppositePosition = std::lower_bound(gridLines.begin(), gridLines.end(), resolvedOppositePosition);
if (firstLineBeforeOppositePosition != gridLines.end())
firstLineBeforeOppositePositionIndex = firstLineBeforeOppositePosition - gridLines.begin();
size_t gridLineIndex = std::max<int>(0, firstLineBeforeOppositePositionIndex - position.spanPosition() + 1);
size_t resolvedGridLinePosition = gridLines[gridLineIndex];
if (resolvedGridLinePosition > resolvedOppositePosition)
resolvedGridLinePosition = resolvedOppositePosition;
return GridSpan::create(resolvedGridLinePosition, resolvedOppositePosition);
}
static PassOwnPtr<GridSpan> createWithFinalNamedSpanAgainstOpposite(size_t resolvedOppositePosition, const GridPosition& position, const Vector<size_t>& gridLines)
{
size_t firstLineAfterOppositePositionIndex = gridLines.size() - 1;
const size_t* firstLineAfterOppositePosition = std::upper_bound(gridLines.begin(), gridLines.end(), resolvedOppositePosition);
if (firstLineAfterOppositePosition != gridLines.end())
firstLineAfterOppositePositionIndex = firstLineAfterOppositePosition - gridLines.begin();
size_t gridLineIndex = std::min(gridLines.size() - 1, firstLineAfterOppositePositionIndex + position.spanPosition() - 1);
size_t resolvedGridLinePosition = GridPosition::adjustGridPositionForAfterEndSide(gridLines[gridLineIndex]);
if (resolvedGridLinePosition < resolvedOppositePosition)
resolvedGridLinePosition = resolvedOppositePosition;
return GridSpan::create(resolvedOppositePosition, resolvedGridLinePosition);
}
GridSpan(size_t initialPosition, size_t finalPosition)
: initialPositionIndex(initialPosition)
, finalPositionIndex(finalPosition)
{
ASSERT(initialPositionIndex <= finalPositionIndex);
}
bool operator==(const GridSpan& o) const
{
return initialPositionIndex == o.initialPositionIndex && finalPositionIndex == o.finalPositionIndex;
}
size_t initialPositionIndex;
size_t finalPositionIndex;
};
// This represents a grid area that spans in both rows' and columns' direction.
struct GridCoordinate {
// HashMap requires a default constuctor.
GridCoordinate()
: columns(0, 0)
, rows(0, 0)
{
}
GridCoordinate(const GridSpan& r, const GridSpan& c)
: columns(c)
, rows(r)
{
}
bool operator==(const GridCoordinate& o) const
{
return columns == o.columns && rows == o.rows;
}
bool operator!=(const GridCoordinate& o) const
{
return !(*this == o);
}
GridSpan columns;
GridSpan rows;
};
typedef HashMap<String, GridCoordinate> NamedGridAreaMap;
} // namespace WebCore
#endif // GridCoordinate_h
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