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/*
* Copyright (C) 2018 Igalia S.L.
*
* 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.
*/
#include "config.h"
#include "GridBaselineAlignment.h"
#include "AncestorSubgridIterator.h"
#include "BaselineAlignmentInlines.h"
#include "RenderBoxInlines.h"
#include "RenderGrid.h"
#include "RenderStyleConstants.h"
namespace WebCore {
LayoutUnit GridBaselineAlignment::logicalAscentForGridItem(const RenderBox& gridItem, GridAxis alignmentAxis, ItemPosition position) const
{
auto hasOrthogonalAncestorSubgrids = [&] {
for (auto& currentAncestorSubgrid : ancestorSubgridsOfGridItem(gridItem, GridTrackSizingDirection::ForRows)) {
if (currentAncestorSubgrid.isHorizontalWritingMode() != currentAncestorSubgrid.parent()->isHorizontalWritingMode())
return true;
}
return false;
};
ExtraMarginsFromSubgrids extraMarginsFromAncestorSubgrids;
if (alignmentAxis == GridAxis::GridColumnAxis && !hasOrthogonalAncestorSubgrids())
extraMarginsFromAncestorSubgrids = GridLayoutFunctions::extraMarginForSubgridAncestors(GridTrackSizingDirection::ForRows, gridItem);
LayoutUnit ascent = ascentForGridItem(gridItem, alignmentAxis, position) + extraMarginsFromAncestorSubgrids.extraTrackStartMargin();
return (isDescentBaselineForGridItem(gridItem, alignmentAxis) || position == ItemPosition::LastBaseline) ? descentForGridItem(gridItem, ascent, alignmentAxis, extraMarginsFromAncestorSubgrids) : ascent;
}
LayoutUnit GridBaselineAlignment::ascentForGridItem(const RenderBox& gridItem, GridAxis alignmentAxis, ItemPosition position) const
{
static const LayoutUnit noValidBaseline = LayoutUnit(-1);
ASSERT(position == ItemPosition::Baseline || position == ItemPosition::LastBaseline);
auto baseline = 0_lu;
auto gridItemMargin = alignmentAxis == GridAxis::GridColumnAxis
? gridItem.marginBefore(m_writingMode)
: gridItem.marginStart(m_writingMode);
auto& parentStyle = gridItem.parent()->style();
if (alignmentAxis == GridAxis::GridColumnAxis) {
auto alignmentContextDirection = [&] {
return parentStyle.writingMode().isHorizontal() ? LineDirectionMode::HorizontalLine : LineDirectionMode::VerticalLine;
};
if (!isParallelToAlignmentAxisForGridItem(gridItem, alignmentAxis))
return gridItemMargin + synthesizedBaseline(gridItem, parentStyle, alignmentContextDirection(), BaselineSynthesisEdge::BorderBox);
auto ascent = position == ItemPosition::Baseline ? gridItem.firstLineBaseline() : gridItem.lastLineBaseline();
if (!ascent)
return gridItemMargin + synthesizedBaseline(gridItem, parentStyle, alignmentContextDirection(), BaselineSynthesisEdge::BorderBox);
baseline = ascent.value();
} else {
auto computedBaselineValue = position == ItemPosition::Baseline ? gridItem.firstLineBaseline() : gridItem.lastLineBaseline();
baseline = isParallelToAlignmentAxisForGridItem(gridItem, alignmentAxis) ? computedBaselineValue.value_or(noValidBaseline) : noValidBaseline;
// We take border-box's under edge if no valid baseline.
if (baseline == noValidBaseline) {
ASSERT(!gridItem.needsLayout());
if (isVerticalAlignmentContext(alignmentAxis))
return m_writingMode.isBlockFlipped() ? gridItemMargin + gridItem.size().width().toInt() : gridItemMargin;
return gridItemMargin + synthesizedBaseline(gridItem, parentStyle, LineDirectionMode::HorizontalLine, BaselineSynthesisEdge::BorderBox);
}
}
return gridItemMargin + baseline;
}
LayoutUnit GridBaselineAlignment::descentForGridItem(const RenderBox& gridItem, LayoutUnit ascent, GridAxis alignmentAxis, ExtraMarginsFromSubgrids extraMarginsFromAncestorSubgrids) const
{
ASSERT(!gridItem.needsLayout());
if (isParallelToAlignmentAxisForGridItem(gridItem, alignmentAxis))
return extraMarginsFromAncestorSubgrids.extraTotalMargin() + gridItem.marginLogicalHeight() + gridItem.logicalHeight() - ascent;
return gridItem.marginLogicalWidth() + gridItem.logicalWidth() - ascent;
}
bool GridBaselineAlignment::isDescentBaselineForGridItem(const RenderBox& gridItem, GridAxis alignmentAxis) const
{
return isVerticalAlignmentContext(alignmentAxis)
&& ((gridItem.writingMode().isBlockFlipped() && !m_writingMode.isBlockFlipped())
|| (gridItem.writingMode().isLineInverted() && m_writingMode.isBlockFlipped()));
}
bool GridBaselineAlignment::isVerticalAlignmentContext(GridAxis alignmentAxis) const
{
return (alignmentAxis == GridAxis::GridRowAxis) == m_writingMode.isHorizontal();
}
bool GridBaselineAlignment::isOrthogonalGridItemForBaseline(const RenderBox& gridItem) const
{
return m_writingMode.isOrthogonal(gridItem.writingMode());
}
bool GridBaselineAlignment::isParallelToAlignmentAxisForGridItem(const RenderBox& gridItem, GridAxis alignmentAxis) const
{
return alignmentAxis == GridAxis::GridColumnAxis ? !isOrthogonalGridItemForBaseline(gridItem) : isOrthogonalGridItemForBaseline(gridItem);
}
const BaselineGroup& GridBaselineAlignment::baselineGroupForGridItem(ItemPosition preference, unsigned sharedContext, const RenderBox& gridItem, GridAxis alignmentAxis) const
{
ASSERT(isBaselinePosition(preference));
bool isRowAxisContext = alignmentAxis == GridAxis::GridColumnAxis;
auto& baselineAlignmentStateMap = isRowAxisContext ? m_rowAxisBaselineAlignmentStates : m_colAxisBaselineAlignmentStates;
auto* baselineAlignmentState = baselineAlignmentStateMap.get(sharedContext);
ASSERT(baselineAlignmentState);
return baselineAlignmentState->sharedGroup(gridItem, preference);
}
void GridBaselineAlignment::updateBaselineAlignmentContext(ItemPosition preference, unsigned sharedContext, const RenderBox& gridItem, GridAxis alignmentAxis)
{
ASSERT(isBaselinePosition(preference));
ASSERT(!gridItem.needsLayout());
// Determine Ascent and Descent values of this grid item with respect to
// its grid container.
LayoutUnit ascent = logicalAscentForGridItem(gridItem, alignmentAxis, preference);
// Looking up for a shared alignment context perpendicular to the
// alignment axis.
bool isRowAxisContext = alignmentAxis == GridAxis::GridColumnAxis;
auto& baselineAlignmentStateMap = isRowAxisContext ? m_rowAxisBaselineAlignmentStates : m_colAxisBaselineAlignmentStates;
// Looking for a compatible baseline-sharing group.
if (auto* baselineAlignmentStateSearch = baselineAlignmentStateMap.get(sharedContext))
baselineAlignmentStateSearch->updateSharedGroup(gridItem, preference, ascent);
else
baselineAlignmentStateMap.add(sharedContext, makeUnique<BaselineAlignmentState>(gridItem, preference, ascent));
}
LayoutUnit GridBaselineAlignment::baselineOffsetForGridItem(ItemPosition preference, unsigned sharedContext, const RenderBox& gridItem, GridAxis alignmentAxis) const
{
ASSERT(isBaselinePosition(preference));
auto& group = baselineGroupForGridItem(preference, sharedContext, gridItem, alignmentAxis);
if (group.computeSize() > 1)
return group.maxAscent() - logicalAscentForGridItem(gridItem, alignmentAxis, preference);
return LayoutUnit();
}
void GridBaselineAlignment::clear(GridAxis alignmentAxis)
{
if (alignmentAxis == GridAxis::GridColumnAxis)
m_rowAxisBaselineAlignmentStates.clear();
else
m_colAxisBaselineAlignmentStates.clear();
}
} // namespace WebCore
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