void GridResolvedPosition::adjustGridPositionsFromStyle(const RenderStyle& gridContainerStyle, GridPosition& initialPosition, GridPosition& finalPosition, GridPositionSide initialPositionSide, GridPositionSide finalPositionSide)
{
ASSERT(isColumnSide(initialPositionSide) == isColumnSide(finalPositionSide));
// We must handle the placement error handling code here instead of in the StyleAdjuster because we don't want to
// overwrite the specified values.
if (initialPosition.isSpan() && finalPosition.isSpan())
finalPosition.setAutoPosition();
// Try to early detect the case of non existing named grid lines. This way we could assume later that
// GridResolvedPosition::resolveGrisPositionFromStyle() won't require the autoplacement to run, i.e., it'll always return a
// valid resolved position.
if (initialPosition.isNamedGridArea() && isNonExistentNamedLineOrArea(initialPosition.namedGridLine(), gridContainerStyle, initialPositionSide))
initialPosition.setAutoPosition();
if (finalPosition.isNamedGridArea() && isNonExistentNamedLineOrArea(finalPosition.namedGridLine(), gridContainerStyle, finalPositionSide))
finalPosition.setAutoPosition();
// If the grid item has an automatic position and a grid span for a named line in a given dimension, instead treat the grid span as one.
if (initialPosition.isAuto() && finalPosition.isSpan() && !finalPosition.namedGridLine().isNull())
finalPosition.setSpanPosition(1, String());
if (finalPosition.isAuto() && initialPosition.isSpan() && !initialPosition.namedGridLine().isNull())
initialPosition.setSpanPosition(1, String());
}
std::unique_ptr<GridSpan> GridResolvedPosition::resolveNamedGridLinePositionAgainstOppositePosition(const RenderStyle& gridContainerStyle, const GridResolvedPosition& resolvedOppositePosition, const GridPosition& position, GridPositionSide side)
{
ASSERT(position.isSpan());
ASSERT(!position.namedGridLine().isNull());
// Negative positions are not allowed per the specification and should have been handled during parsing.
ASSERT(position.spanPosition() > 0);
const NamedGridLinesMap& gridLinesNames = isColumnSide(side) ? gridContainerStyle.namedGridColumnLines() : gridContainerStyle.namedGridRowLines();
NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine());
// If there is no named grid line of that name, we resolve the position to 'auto' (which is equivalent to 'span 1' in this case).
// See http://lists.w3.org/Archives/Public/www-style/2013Jun/0394.html.
if (it == gridLinesNames.end())
return std::make_unique<GridSpan>(resolvedOppositePosition, resolvedOppositePosition);
if (side == RowStartSide || side == ColumnStartSide)
return resolveRowStartColumnStartNamedGridLinePositionAgainstOppositePosition(resolvedOppositePosition, position, it->value);
return resolveRowEndColumnEndNamedGridLinePositionAgainstOppositePosition(resolvedOppositePosition, position, it->value);
}
GridResolvedPosition GridResolvedPosition::resolveNamedGridLinePositionFromStyle(const RenderStyle& gridContainerStyle, const GridPosition& position, GridPositionSide side)
{
ASSERT(!position.namedGridLine().isNull());
const NamedGridLinesMap& gridLinesNames = isColumnSide(side) ? gridContainerStyle.namedGridColumnLines() : gridContainerStyle.namedGridRowLines();
NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine());
if (it == gridLinesNames.end()) {
if (position.isPositive())
return 0;
const size_t lastLine = explicitGridSizeForSide(gridContainerStyle, side);
return GridResolvedPosition::adjustGridPositionForSide(lastLine, side);
}
size_t namedGridLineIndex;
if (position.isPositive())
namedGridLineIndex = std::min<size_t>(position.integerPosition(), it->value.size()) - 1;
else
namedGridLineIndex = std::max<int>(it->value.size() - abs(position.integerPosition()), 0);
return GridResolvedPosition::adjustGridPositionForSide(it->value[namedGridLineIndex], side);
}
static unsigned explicitGridSizeForSide(const RenderStyle& gridContainerStyle, GridPositionSide side, unsigned autoRepeatTracksCount)
{
return isColumnSide(side) ? GridPositionsResolver::explicitGridColumnCount(gridContainerStyle, autoRepeatTracksCount) : GridPositionsResolver::explicitGridRowCount(gridContainerStyle, autoRepeatTracksCount);
}
static inline const NamedGridLinesMap& gridLinesForSide(const RenderStyle& style, GridPositionSide side)
{
return isColumnSide(side) ? style.namedGridColumnLines() : style.namedGridRowLines();
}
static size_t explicitGridSizeForSide(const RenderStyle& gridContainerStyle, GridPositionSide side)
{
return isColumnSide(side) ? gridContainerStyle.gridColumns().size() : gridContainerStyle.gridRows().size();
}
