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/*
* Copyright (C) 2020 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 "FlexFormattingUtils.h"
#include "FlexFormattingContext.h"
#include "LayoutContext.h"
#include "LogicalFlexItem.h"
#include "RenderStyleInlines.h"
namespace WebCore {
namespace Layout {
FlexFormattingUtils::FlexFormattingUtils(const FlexFormattingContext& flexFormattingContext)
: m_flexFormattingContext(flexFormattingContext)
{
}
bool FlexFormattingUtils::isMainAxisParallelWithInlineAxis(const ElementBox& flexContainer)
{
ASSERT(flexContainer.isFlexBox());
auto& flexContainerStyle = flexContainer.style();
auto isHorizontalWritingMode = flexContainerStyle.writingMode().isHorizontal();
auto flexDirection = flexContainerStyle.flexDirection();
return (isHorizontalWritingMode && (flexDirection == FlexDirection::Row || flexDirection == FlexDirection::RowReverse)) || (!isHorizontalWritingMode && (flexDirection == FlexDirection::Column || flexDirection == FlexDirection::ColumnReverse));
}
ContentPosition FlexFormattingUtils::logicalJustifyContentPosition(const ElementBox& flexContainer, ContentPosition justifyContentPosition)
{
ASSERT(flexContainer.isFlexBox());
if (justifyContentPosition != ContentPosition::Right && justifyContentPosition != ContentPosition::Left)
return justifyContentPosition;
auto& flexContainerStyle = flexContainer.style();
// If the property's axis is not parallel with either left<->right axis, this value behaves as start (https://drafts.csswg.org/css-align/#positional-values)
// Currently, the only case where the property’s axis is not parallel with either left<->right axis is in a column flexbox.
// https://drafts.csswg.org/css-align/#positional-values
if (flexContainerStyle.isColumnFlexDirection() && flexContainerStyle.writingMode().isHorizontal())
return ContentPosition::Start;
auto isLeftToRightInAxisDirection = flexContainerStyle.isRowFlexDirection() ? flexContainerStyle.writingMode().isLogicalLeftInlineStart() : flexContainerStyle.writingMode().isBlockLeftToRight();
if (justifyContentPosition == ContentPosition::Left)
return isLeftToRightInAxisDirection ? ContentPosition::Start : ContentPosition::End;
return isLeftToRightInAxisDirection ? ContentPosition::End : ContentPosition::Start;
}
bool FlexFormattingUtils::isMainReversedToContentDirection(const ElementBox& flexContainer)
{
ASSERT(flexContainer.isFlexBox());
auto flexDirection = flexContainer.style().flexDirection();
return flexDirection == FlexDirection::RowReverse || flexDirection == FlexDirection::ColumnReverse;
}
bool FlexFormattingUtils::areFlexLinesReversedInCrossAxis(const ElementBox& flexContainer)
{
ASSERT(flexContainer.isFlexBox());
return flexContainer.style().flexWrap() == FlexWrap::Reverse;
}
// The column-gap property specifies spacing between "columns", separating boxes in the container's inline axis similar to inline-axis margin;
// while row-gap indicates spacing between "rows". separating boxes in the container's block axis.
// horizontal row : column gap
// vertical row : column gap
// horizontal column : row gap
// vertical column : row gap
LayoutUnit FlexFormattingUtils::mainAxisGapValue(const ElementBox& flexContainer, LayoutUnit flexContainerContentBoxWidth)
{
ASSERT(flexContainer.isFlexBox());
auto flexDirection = flexContainer.style().flexDirection();
auto isMainAxisInlineAxis = flexDirection == FlexDirection::Row || flexDirection == FlexDirection::RowReverse;
auto& gapValue = isMainAxisInlineAxis ? flexContainer.style().columnGap() : flexContainer.style().rowGap();
if (gapValue.isNormal())
return { };
return valueForLength(gapValue.length(), flexContainerContentBoxWidth);
}
LayoutUnit FlexFormattingUtils::crossAxisGapValue(const ElementBox& flexContainer, LayoutUnit flexContainerContentBoxHeight)
{
ASSERT(flexContainer.isFlexBox());
auto flexDirection = flexContainer.style().flexDirection();
auto isMainAxisInlineAxis = flexDirection == FlexDirection::Row || flexDirection == FlexDirection::RowReverse;
auto& gapValue = isMainAxisInlineAxis ? flexContainer.style().rowGap() : flexContainer.style().columnGap();
if (gapValue.isNormal())
return { };
return valueForLength(gapValue.length(), flexContainerContentBoxHeight);
}
// flex container direction flex item main axis size
// horizontal row horizontal : width
// vertical column horizontal : width
// vertical row vertical : width
// horizontal column vertical : width
//
// horizontal row vertical : height
// horizontal column horizontal : height
// vertical row horizontal : height
// vertical column vertical : height
LayoutUnit FlexFormattingUtils::usedMinimumSizeInMainAxis(const LogicalFlexItem& flexItem) const
{
if (auto mainAxisMinimumWidth = flexItem.mainAxis().minimumSize)
return *mainAxisMinimumWidth;
auto& flexContainer = formattingContext().root();
auto& flexItemBox = downcast<ElementBox>(flexItem.layoutBox());
auto isMainAxisParallelWithInlineAxis = this->isMainAxisParallelWithInlineAxis(flexContainer);
auto minimumContentSize = LayoutUnit { };
auto shouldUseFlexItemContentWidth =
(isMainAxisParallelWithInlineAxis && flexItem.writingMode().isHorizontal())
|| (!isMainAxisParallelWithInlineAxis && flexItem.writingMode().isVertical());
minimumContentSize = shouldUseFlexItemContentWidth ? formattingContext().integrationUtils().minContentWidth(flexItemBox) : formattingContext().integrationUtils().minContentHeight(flexItemBox);
if (auto mainAxisWidth = flexItem.mainAxis().size)
minimumContentSize = std::min(*mainAxisWidth, minimumContentSize);
return minimumContentSize;
}
std::optional<LayoutUnit> FlexFormattingUtils::usedMaximumSizeInMainAxis(const LogicalFlexItem& flexItem) const
{
// Initial value of 'max-width: none' computes to used 'infinite'
return flexItem.mainAxis().maximumSize;
}
LayoutUnit FlexFormattingUtils::usedMaxContentSizeInMainAxis(const LogicalFlexItem& flexItem) const
{
auto& flexContainer = formattingContext().root();
auto& flexItemBox = downcast<ElementBox>(flexItem.layoutBox());
auto isMainAxisParallelWithInlineAxis = this->isMainAxisParallelWithInlineAxis(flexContainer);
auto contentSize = LayoutUnit { };
auto shouldUseFlexItemContentWidth =
(isMainAxisParallelWithInlineAxis && flexItem.writingMode().isHorizontal())
|| (!isMainAxisParallelWithInlineAxis && flexItem.writingMode().isVertical());
if (shouldUseFlexItemContentWidth)
contentSize = formattingContext().integrationUtils().maxContentWidth(flexItemBox);
else {
formattingContext().integrationUtils().layoutWithFormattingContextForBox(flexItemBox);
auto isOrthogonal = flexContainer.writingMode().isOrthogonal(flexItem.writingMode());
contentSize = !isOrthogonal ? formattingContext().geometryForFlexItem(flexItemBox).contentBoxHeight() : formattingContext().geometryForFlexItem(flexItemBox).contentBoxWidth();
}
if (!flexItem.isContentBoxBased())
contentSize += flexItem.mainAxis().borderAndPadding;
return contentSize;
}
LayoutUnit FlexFormattingUtils::usedSizeInCrossAxis(const LogicalFlexItem& flexItem, LayoutUnit maxAxisConstraint) const
{
if (auto definiteSize = flexItem.crossAxis().definiteSize)
return *definiteSize;
auto& flexContainer = formattingContext().root();
auto& flexItemBox = flexItem.layoutBox();
auto isMainAxisParallelWithInlineAxis = this->isMainAxisParallelWithInlineAxis(flexContainer);
auto widtConstraintForLayout = isMainAxisParallelWithInlineAxis ? std::make_optional(maxAxisConstraint) : std::nullopt;
auto shouldUseFlexItemContentHeight =
(isMainAxisParallelWithInlineAxis && flexItem.writingMode().isHorizontal())
|| (!isMainAxisParallelWithInlineAxis && flexItem.writingMode().isVertical());
formattingContext().integrationUtils().layoutWithFormattingContextForBox(downcast<ElementBox>(flexItemBox), widtConstraintForLayout);
auto crossSize = shouldUseFlexItemContentHeight ? formattingContext().geometryForFlexItem(flexItemBox).contentBoxHeight() : formattingContext().geometryForFlexItem(flexItemBox).contentBoxWidth();
if (!flexItem.isContentBoxBased())
crossSize += flexItem.crossAxis().borderAndPadding;
return crossSize;
}
}
}
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