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/*
* Copyright (C) 2025 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "GridFormattingContext.h"
#include "GridItemRect.h"
#include "GridLayout.h"
#include "GridLayoutUtils.h"
#include "LayoutBoxGeometry.h"
#include "LayoutChildIterator.h"
#include "PlacedGridItem.h"
#include "RenderStyleInlines.h"
#include "StylePrimitiveNumeric.h"
#include "UnplacedGridItem.h"
#include "UsedTrackSizes.h"
#include <wtf/Vector.h>
namespace WebCore {
namespace Layout {
GridFormattingContext::GridFormattingContext(const ElementBox& gridBox, LayoutState& layoutState)
: m_gridBox(gridBox)
, m_globalLayoutState(layoutState)
, m_integrationUtils(layoutState)
{
}
UnplacedGridItems GridFormattingContext::constructUnplacedGridItems() const
{
struct GridItem {
CheckedRef<const ElementBox> layoutBox;
int order;
};
Vector<GridItem> gridItems;
for (CheckedRef gridItem : childrenOfType<ElementBox>(m_gridBox)) {
if (gridItem->isOutOfFlowPositioned())
continue;
gridItems.append({ gridItem, gridItem->style().order().value });
}
std::ranges::stable_sort(gridItems, { }, &GridItem::order);
UnplacedGridItems unplacedGridItems;
for (auto& gridItem : gridItems) {
CheckedRef gridItemStyle = gridItem.layoutBox->style();
auto gridItemColumnStart = gridItemStyle->gridItemColumnStart();
auto gridItemColumnEnd = gridItemStyle->gridItemColumnEnd();
auto gridItemRowStart = gridItemStyle->gridItemRowStart();
auto gridItemRowEnd = gridItemStyle->gridItemRowEnd();
UnplacedGridItem unplacedGridItem {
gridItem.layoutBox,
gridItemColumnStart,
gridItemColumnEnd,
gridItemRowStart,
gridItemRowEnd
};
// Check if this item is fully explicitly positioned
bool fullyExplicitlyPositionedItem = gridItemColumnStart.isExplicit()
&& gridItemColumnEnd.isExplicit()
&& gridItemRowStart.isExplicit()
&& gridItemRowEnd.isExplicit();
// FIXME: support definite row/column positioning
// We should place items with definite row or column positions
// but currently we only support fully explicitly positioned items.
// See: https://www.w3.org/TR/css-grid-1/#auto-placement-algo
if (fullyExplicitlyPositionedItem) {
unplacedGridItems.nonAutoPositionedItems.append(unplacedGridItem);
} else if (unplacedGridItem.hasDefiniteRowPosition()) {
unplacedGridItems.definiteRowPositionedItems.append(unplacedGridItem);
} else {
unplacedGridItems.autoPositionedItems.append(unplacedGridItem);
}
}
return unplacedGridItems;
}
void GridFormattingContext::layout(GridLayoutConstraints layoutConstraints)
{
auto unplacedGridItems = constructUnplacedGridItems();
auto [ usedTrackSizes, gridItemRects ] = GridLayout { *this }.layout(layoutConstraints, unplacedGridItems);
// Grid layout positions each item within its containing block which is the grid area.
// Here we translate it to the coordinate space of the grid.
auto mapGridItemLocationsToGrid = [&] {
for (auto& gridItemRect : gridItemRects) {
auto& lineNumbersForGridArea = gridItemRect.lineNumbersForGridArea;
auto columnLocation = GridLayoutUtils::computeTrackSizesBefore(lineNumbersForGridArea.columnStartLine, usedTrackSizes.columnSizes);
auto rowLocation = GridLayoutUtils::computeTrackSizesBefore(lineNumbersForGridArea.rowStartLine, usedTrackSizes.rowSizes);
gridItemRect.borderBoxRect.moveBy({ columnLocation, rowLocation });
}
};
mapGridItemLocationsToGrid();
setGridItemGeometries(gridItemRects);
}
PlacedGridItems GridFormattingContext::constructPlacedGridItems(const GridAreas& gridAreas) const
{
PlacedGridItems placedGridItems;
placedGridItems.reserveInitialCapacity(gridAreas.size());
for (auto [ unplacedGridItem, gridAreaLines ] : gridAreas) {
CheckedRef gridItemStyle = unplacedGridItem.m_layoutBox->style();
auto usedJustifySelf = [&] {
if (auto gridItemJustifySelf = gridItemStyle->justifySelf(); gridItemJustifySelf.position() != ItemPosition::Auto)
return gridItemJustifySelf;
auto& formattingContextRootStyle = root().style();
return formattingContextRootStyle.justifyItems();
};
auto usedAlignSelf = [&] {
if (auto gridItemAlignSelf = gridItemStyle->alignSelf(); gridItemAlignSelf.position() != ItemPosition::Auto)
return gridItemAlignSelf;
auto& formattingContextRootStyle = root().style();
return formattingContextRootStyle.alignItems();
};
PlacedGridItem::ComputedSizes inlineAxisSizes {
gridItemStyle->width(),
gridItemStyle->minWidth(),
gridItemStyle->maxWidth(),
gridItemStyle->marginLeft(),
gridItemStyle->marginRight()
};
PlacedGridItem::ComputedSizes blockAxisSizes {
gridItemStyle->height(),
gridItemStyle->minHeight(),
gridItemStyle->maxHeight(),
gridItemStyle->marginTop(),
gridItemStyle->marginBottom()
};
placedGridItems.constructAndAppend(unplacedGridItem, gridAreaLines, inlineAxisSizes, blockAxisSizes, usedJustifySelf(), usedAlignSelf());
}
return placedGridItems;
}
const BoxGeometry& GridFormattingContext::geometryForGridItem(const ElementBox& layoutBox) const
{
ASSERT(layoutBox.isGridItem());
return layoutState().geometryForBox(layoutBox);
}
BoxGeometry& GridFormattingContext::geometryForGridItem(const ElementBox& layoutBox)
{
ASSERT(layoutBox.isGridItem());
return m_globalLayoutState->ensureGeometryForBox(layoutBox);
}
void GridFormattingContext::setGridItemGeometries(const GridItemRects& gridItemRects)
{
for (auto& gridItemRect : gridItemRects) {
auto& boxGeometry = geometryForGridItem(gridItemRect.layoutBox);
auto& gridItemBorderBox = gridItemRect.borderBoxRect;
auto& margins = gridItemRect.margins;
boxGeometry.setHorizontalMargin({ margins.left(), margins.right() });
boxGeometry.setVerticalMargin({ margins.top(), margins.bottom() });
boxGeometry.setTopLeft(gridItemBorderBox.location());
auto contentBoxInlineSize = gridItemBorderBox.width() - boxGeometry.horizontalBorderAndPadding();
auto contentBoxBlockSize = gridItemBorderBox.height() - boxGeometry.verticalBorderAndPadding();
boxGeometry.setContentBoxSize({ contentBoxInlineSize, contentBoxBlockSize });
}
}
} // namespace Layout
} // namespace WebCore
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