GridSpan GridPositionsResolver::resolveGridPositionsFromStyle(const RenderStyle& gridContainerStyle, const RenderBox& gridItem, GridTrackSizingDirection direction, unsigned autoRepeatTracksCount)
{
GridPosition initialPosition, finalPosition;
adjustGridPositionsFromStyle(gridContainerStyle, gridItem, direction, initialPosition, finalPosition);
GridPositionSide initialSide = initialPositionSide(direction);
GridPositionSide finalSide = finalPositionSide(direction);
// We can't get our grid positions without running the auto placement algorithm.
if (initialPosition.shouldBeResolvedAgainstOppositePosition() && finalPosition.shouldBeResolvedAgainstOppositePosition())
return GridSpan::indefiniteGridSpan();
if (initialPosition.shouldBeResolvedAgainstOppositePosition()) {
// Infer the position from the final position ('auto / 1' or 'span 2 / 3' case).
auto endLine = resolveGridPositionFromStyle(gridContainerStyle, finalPosition, finalSide, autoRepeatTracksCount);
return resolveGridPositionAgainstOppositePosition(gridContainerStyle, endLine, initialPosition, initialSide, autoRepeatTracksCount);
}
if (finalPosition.shouldBeResolvedAgainstOppositePosition()) {
// Infer our position from the initial position ('1 / auto' or '3 / span 2' case).
auto startLine = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialSide, autoRepeatTracksCount);
return resolveGridPositionAgainstOppositePosition(gridContainerStyle, startLine, finalPosition, finalSide, autoRepeatTracksCount);
}
int startLine = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialSide, autoRepeatTracksCount);
int endLine = resolveGridPositionFromStyle(gridContainerStyle, finalPosition, finalSide, autoRepeatTracksCount);
if (startLine > endLine)
std::swap(startLine, endLine);
else if (startLine == endLine)
endLine = startLine + 1;
return GridSpan::untranslatedDefiniteGridSpan(startLine, std::max(startLine, endLine));
}
GridSpan GridResolvedPosition::resolveGridPositionsFromStyle(const ComputedStyle& gridContainerStyle, const LayoutBox& gridItem, GridTrackSizingDirection direction)
{
GridPosition initialPosition, finalPosition;
initialAndFinalPositionsFromStyle(gridContainerStyle, gridItem, direction, initialPosition, finalPosition);
GridPositionSide initialSide = initialPositionSide(direction);
GridPositionSide finalSide = finalPositionSide(direction);
if (initialPosition.shouldBeResolvedAgainstOppositePosition() && finalPosition.shouldBeResolvedAgainstOppositePosition()) {
// We can't get our grid positions without running the auto placement algorithm.
return GridSpan::indefiniteGridSpan();
}
if (initialPosition.shouldBeResolvedAgainstOppositePosition()) {
// Infer the position from the final position ('auto / 1' or 'span 2 / 3' case).
GridResolvedPosition finalResolvedPosition = resolveGridPositionFromStyle(gridContainerStyle, finalPosition, finalSide);
return resolveGridPositionAgainstOppositePosition(gridContainerStyle, finalResolvedPosition, initialPosition, initialSide);
}
if (finalPosition.shouldBeResolvedAgainstOppositePosition()) {
// Infer our position from the initial position ('1 / auto' or '3 / span 2' case).
GridResolvedPosition initialResolvedPosition = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialSide);
return resolveGridPositionAgainstOppositePosition(gridContainerStyle, initialResolvedPosition, finalPosition, finalSide);
}
GridResolvedPosition resolvedInitialPosition = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialSide);
GridResolvedPosition resolvedFinalPosition = resolveGridPositionFromStyle(gridContainerStyle, finalPosition, finalSide);
// If 'grid-after' specifies a line at or before that specified by 'grid-before', it computes to 'span 1'.
if (resolvedFinalPosition <= resolvedInitialPosition)
resolvedFinalPosition = resolvedInitialPosition.next();
return GridSpan::definiteGridSpan(resolvedInitialPosition, resolvedFinalPosition);
}
static void adjustGridPositionsFromStyle(const RenderStyle& gridContainerStyle, const RenderBox& gridItem, GridTrackSizingDirection direction, GridPosition& initialPosition, GridPosition& finalPosition)
{
bool isForColumns = direction == ForColumns;
initialPosition = isForColumns ? gridItem.style().gridItemColumnStart() : gridItem.style().gridItemRowStart();
finalPosition = isForColumns ? gridItem.style().gridItemColumnEnd() : gridItem.style().gridItemRowEnd();
// 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();
if (gridItem.isOutOfFlowPositioned()) {
// Early detect the case of non existing named grid lines for positioned items.
if (initialPosition.isNamedGridArea() && !NamedLineCollection::isValidNamedLineOrArea(initialPosition.namedGridLine(), gridContainerStyle, initialPositionSide(direction)))
initialPosition.setAutoPosition();
if (finalPosition.isNamedGridArea() && !NamedLineCollection::isValidNamedLineOrArea(finalPosition.namedGridLine(), gridContainerStyle, finalPositionSide(direction)))
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());
}
void GridResolvedPosition::initialAndFinalPositionsFromStyle(const ComputedStyle& gridContainerStyle, const LayoutBox& gridItem, GridTrackSizingDirection direction, GridPosition& initialPosition, GridPosition& finalPosition)
{
initialPosition = (direction == ForColumns) ? gridItem.style()->gridColumnStart() : gridItem.style()->gridRowStart();
finalPosition = (direction == ForColumns) ? gridItem.style()->gridColumnEnd() : gridItem.style()->gridRowEnd();
// 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() always return a valid resolved position.
if (initialPosition.isNamedGridArea() && !isValidNamedLineOrArea(initialPosition.namedGridLine(), gridContainerStyle, initialPositionSide(direction)))
initialPosition.setAutoPosition();
if (finalPosition.isNamedGridArea() && !isValidNamedLineOrArea(finalPosition.namedGridLine(), gridContainerStyle, finalPositionSide(direction)))
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());
}
