103 lines
4.7 KiB
C++
103 lines
4.7 KiB
C++
/*
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* Copyright (C) 2017 Igalia S.L.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "GridLayoutFunctions.h"
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#include "LengthFunctions.h"
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#include "RenderGrid.h"
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namespace WebCore {
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namespace GridLayoutFunctions {
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static inline bool marginStartIsAuto(const RenderBox& child, GridTrackSizingDirection direction)
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{
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return direction == ForColumns ? child.style().marginStart().isAuto() : child.style().marginBefore().isAuto();
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}
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static inline bool marginEndIsAuto(const RenderBox& child, GridTrackSizingDirection direction)
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{
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return direction == ForColumns ? child.style().marginEnd().isAuto() : child.style().marginAfter().isAuto();
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}
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static bool childHasMargin(const RenderBox& child, GridTrackSizingDirection direction)
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{
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// Length::IsZero returns true for 'auto' margins, which is aligned with the purpose of this function.
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if (direction == ForColumns)
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return !child.style().marginStart().isZero() || !child.style().marginEnd().isZero();
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return !child.style().marginBefore().isZero() || !child.style().marginAfter().isZero();
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}
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LayoutUnit computeMarginLogicalSizeForChild(const RenderGrid& grid, GridTrackSizingDirection direction, const RenderBox& child)
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{
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GridTrackSizingDirection flowAwareDirection = flowAwareDirectionForChild(grid, child, direction);
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if (!childHasMargin(child, flowAwareDirection))
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return 0;
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LayoutUnit marginStart;
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LayoutUnit marginEnd;
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if (direction == ForColumns)
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child.computeInlineDirectionMargins(grid, child.containingBlockLogicalWidthForContentInFragment(nullptr), child.logicalWidth(), marginStart, marginEnd);
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else
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child.computeBlockDirectionMargins(grid, marginStart, marginEnd);
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return marginStartIsAuto(child, flowAwareDirection) ? marginEnd : marginEndIsAuto(child, flowAwareDirection) ? marginStart : marginStart + marginEnd;
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}
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LayoutUnit marginLogicalSizeForChild(const RenderGrid& grid, GridTrackSizingDirection direction, const RenderBox& child)
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{
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if (child.needsLayout())
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return computeMarginLogicalSizeForChild(grid, direction, child);
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GridTrackSizingDirection flowAwareDirection = flowAwareDirectionForChild(grid, child, direction);
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bool isRowAxis = flowAwareDirection == ForColumns;
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LayoutUnit marginStart = marginStartIsAuto(child, flowAwareDirection) ? 0_lu : isRowAxis ? child.marginStart() : child.marginBefore();
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LayoutUnit marginEnd = marginEndIsAuto(child, flowAwareDirection) ? 0_lu : isRowAxis ? child.marginEnd() : child.marginAfter();
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return marginStart + marginEnd;
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}
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bool isOrthogonalChild(const RenderGrid& grid, const RenderBox& child)
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{
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return child.isHorizontalWritingMode() != grid.isHorizontalWritingMode();
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}
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GridTrackSizingDirection flowAwareDirectionForChild(const RenderGrid& grid, const RenderBox& child, GridTrackSizingDirection direction)
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{
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return !isOrthogonalChild(grid, child) ? direction : (direction == ForColumns ? ForRows : ForColumns);
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}
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bool hasOverridingContainingBlockContentSizeForChild(const RenderBox& child, GridTrackSizingDirection direction)
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{
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return direction == ForColumns ? child.hasOverridingContainingBlockContentLogicalWidth() : child.hasOverridingContainingBlockContentLogicalHeight();
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}
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std::optional<LayoutUnit> overridingContainingBlockContentSizeForChild(const RenderBox& child, GridTrackSizingDirection direction)
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{
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return direction == ForColumns ? child.overridingContainingBlockContentLogicalWidth() : child.overridingContainingBlockContentLogicalHeight();
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}
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} // namespace GridLayoutFunctions
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} // namespace WebCore
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