GridResolvedPosition GridResolvedPosition::resolveGridPositionFromStyle(const RenderStyle& gridContainerStyle, const GridPosition& position, GridPositionSide side) { switch (position.type()) { case ExplicitPosition: { ASSERT(position.integerPosition()); if (!position.namedGridLine().isNull()) return resolveNamedGridLinePositionFromStyle(gridContainerStyle, position, side); // Handle <integer> explicit position. if (position.isPositive()) return GridResolvedPosition::adjustGridPositionForSide(position.integerPosition() - 1, side); size_t resolvedPosition = abs(position.integerPosition()) - 1; const size_t endOfTrack = explicitGridSizeForSide(gridContainerStyle, side); // Per http://lists.w3.org/Archives/Public/www-style/2013Mar/0589.html, we clamp negative value to the first line. if (endOfTrack < resolvedPosition) return 0; return GridResolvedPosition::adjustGridPositionForSide(endOfTrack - resolvedPosition, side); } case NamedGridAreaPosition: { // First attempt to match the grid area's edge to a named grid area: if there is a named line with the name // ''<custom-ident>-start (for grid-*-start) / <custom-ident>-end'' (for grid-*-end), contributes the first such // line to the grid item's placement. String namedGridLine = position.namedGridLine(); ASSERT(!isNonExistentNamedLineOrArea(namedGridLine, gridContainerStyle, side)); const NamedGridLinesMap& gridLineNames = gridLinesForSide(gridContainerStyle, side); auto implicitLine = gridLineNames.find(implicitNamedGridLineForSide(namedGridLine, side)); if (implicitLine != gridLineNames.end()) return GridResolvedPosition::adjustGridPositionForSide(implicitLine->value[0], side); // Otherwise, if there is a named line with the specified name, contributes the first such line to the grid // item's placement. auto explicitLine = gridLineNames.find(namedGridLine); if (explicitLine != gridLineNames.end()) return GridResolvedPosition::adjustGridPositionForSide(explicitLine->value[0], side); // If none of the above works specs mandate us to treat it as auto BUT we should have detected it before calling // this function in resolveGridPositionsFromStyle(). We should be covered anyway by the ASSERT at the beginning // of this case block. ASSERT_NOT_REACHED(); return 0; } case AutoPosition: case SpanPosition: // 'auto' and span depend on the opposite position for resolution (e.g. grid-row: auto / 1 or grid-column: span 3 / "myHeader"). ASSERT_NOT_REACHED(); return GridResolvedPosition(0); } ASSERT_NOT_REACHED(); return GridResolvedPosition(0); }
PassOwnPtr<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 = gridLinesForSide(gridContainerStyle, side); 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 GridSpan::create(resolvedOppositePosition, resolvedOppositePosition); return GridSpan::createWithNamedSpanAgainstOpposite(resolvedOppositePosition, position, side, it->value); }
GridResolvedPosition GridResolvedPosition::resolveNamedGridLinePositionFromStyle(const RenderStyle& gridContainerStyle, const GridPosition& position, GridPositionSide side) { ASSERT(!position.namedGridLine().isNull()); const NamedGridLinesMap& gridLinesNames = gridLinesForSide(gridContainerStyle, side); NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine()); if (it == gridLinesNames.end()) { if (position.isPositive()) return GridResolvedPosition(0); const size_t lastLine = explicitGridSizeForSide(gridContainerStyle, side); return 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 adjustGridPositionForSide(it->value[namedGridLineIndex], side); }
static bool isNonExistentNamedLineOrArea(const String& lineName, const RenderStyle& style, GridPositionSide side) { const NamedGridLinesMap& gridLineNames = gridLinesForSide(style, side); return !gridLineNames.contains(implicitNamedGridLineForSide(lineName, side)) && !gridLineNames.contains(lineName); }
bool GridResolvedPosition::isValidNamedLineOrArea(const String& lineName, const ComputedStyle& style, GridPositionSide side) { const NamedGridLinesMap& gridLineNames = gridLinesForSide(style, side); return gridLineNames.contains(implicitNamedGridLineForSide(lineName, side)) || gridLineNames.contains(lineName); }