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/*
* Copyright (C) 2022 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 "LayoutIntegrationFlexLayout.h"
#include "FlexFormattingConstraints.h"
#include "FlexFormattingContext.h"
#include "FormattingContextBoxIterator.h"
#include "HitTestLocation.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "LayoutBoxGeometry.h"
#include "LayoutChildIterator.h"
#include "LayoutIntegrationBoxGeometryUpdater.h"
#include "RenderBox.h"
#include "RenderBoxInlines.h"
#include "RenderFlexibleBox.h"
#include "RenderView.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
namespace LayoutIntegration {
WTF_MAKE_TZONE_ALLOCATED_IMPL(FlexLayout);
FlexLayout::FlexLayout(RenderFlexibleBox& flexBoxRenderer)
: m_flexBox(BoxTreeUpdater { flexBoxRenderer }.build())
, m_layoutState(flexBoxRenderer.view().layoutState())
{
}
FlexLayout::~FlexLayout()
{
auto& renderer = flexBoxRenderer();
m_flexBox = nullptr;
BoxTreeUpdater { renderer }.tearDown();
}
static inline Layout::ConstraintsForFlexContent constraintsForFlexContent(const Layout::ElementBox& flexContainer)
{
auto& flexContainerRenderer = downcast<RenderFlexibleBox>(*flexContainer.rendererForIntegration());
auto& flexBoxStyle = flexContainer.style();
auto boxSizingIsContentBox = flexBoxStyle.boxSizing() == BoxSizing::ContentBox;
auto availableLogicalWidth = flexContainerRenderer.contentBoxRect().width();
// FIXME: Use root's BoxGeometry which first needs to stop flipping for the formatting context.
auto horizontallMarginBorderAndPadding = flexContainerRenderer.marginAndBorderAndPaddingStart() + flexContainerRenderer.marginAndBorderAndPaddingEnd();
auto verticalMarginBorderAndPadding = flexContainerRenderer.marginAndBorderAndPaddingBefore() + flexContainerRenderer.marginAndBorderAndPaddingAfter();
auto widthValue = [&](auto& computedValue) -> std::optional<LayoutUnit> {
if (computedValue.isFixed())
return LayoutUnit { boxSizingIsContentBox ? computedValue.value() : computedValue.value() - horizontallMarginBorderAndPadding };
if (computedValue.isPercent()) {
auto value = valueForLength(computedValue, flexContainerRenderer.containingBlock()->logicalWidth());
return LayoutUnit { boxSizingIsContentBox ? value : value - horizontallMarginBorderAndPadding };
}
return { };
};
auto heightValue = [&](auto& computedValue, bool callRendererForPercentValue = false) -> std::optional<LayoutUnit> {
if (computedValue.isFixed())
return LayoutUnit { boxSizingIsContentBox ? computedValue.value() : computedValue.value() - verticalMarginBorderAndPadding };
if (computedValue.isPercent()) {
if (callRendererForPercentValue)
return flexContainerRenderer.computePercentageLogicalHeight(computedValue, RenderBox::UpdatePercentageHeightDescendants::No);
if (flexContainerRenderer.containingBlock()->style().logicalHeight().isFixed()) {
auto value = valueForLength(computedValue, flexContainerRenderer.containingBlock()->style().height().value());
return LayoutUnit { boxSizingIsContentBox ? value : value - verticalMarginBorderAndPadding };
}
}
return { };
};
auto widthGeometry = [&]() -> Layout::ConstraintsForFlexContent::AxisGeometry {
return { widthValue(flexBoxStyle.minWidth()), widthValue(flexBoxStyle.maxWidth()), availableLogicalWidth ? availableLogicalWidth : widthValue(flexBoxStyle.width()), flexContainerRenderer.contentBoxLocation().x() };
};
auto heightGeometry = [&]() -> Layout::ConstraintsForFlexContent::AxisGeometry {
auto availableSize = heightValue(flexBoxStyle.height(), true);
auto logicalMinHeight = heightValue(flexBoxStyle.minHeight()).value_or(0_lu);
auto logicalMaxHeight = heightValue(flexBoxStyle.maxHeight());
if (!availableSize || (logicalMaxHeight && *logicalMaxHeight < *availableSize))
availableSize = logicalMaxHeight;
return Layout::ConstraintsForFlexContent::AxisGeometry { logicalMinHeight, logicalMaxHeight, availableSize, flexContainerRenderer.contentBoxLocation().y() };
};
return Layout::FlexFormattingUtils::isMainAxisParallelWithInlineAxis(flexContainer) ? Layout::ConstraintsForFlexContent(widthGeometry(), heightGeometry(), false) : Layout::ConstraintsForFlexContent(heightGeometry(), widthGeometry(), false);
}
void FlexLayout::updateFormattingContexGeometries()
{
auto boxGeometryUpdater = BoxGeometryUpdater { layoutState(), flexBox() };
boxGeometryUpdater.setFormattingContextRootGeometry(flexBoxRenderer().containingBlock()->contentBoxLogicalWidth());
boxGeometryUpdater.setFormattingContextContentGeometry(layoutState().geometryForBox(flexBox()).contentBoxWidth(), { });
}
void FlexLayout::updateStyle(const RenderBlock&, const RenderStyle&)
{
}
std::pair<LayoutUnit, LayoutUnit> FlexLayout::computeIntrinsicWidthConstraints()
{
auto flexFormattingContext = Layout::FlexFormattingContext { flexBox(), layoutState() };
auto constraints = flexFormattingContext.computedIntrinsicWidthConstraints();
return { constraints.minimum, constraints.maximum };
}
void FlexLayout::layout()
{
Layout::FlexFormattingContext { flexBox(), layoutState() }.layout(constraintsForFlexContent(flexBox()));
updateRenderers();
auto relayoutFlexItems = [&] {
// Flex items need to be laid out now with their final size (and through setOverridingBorderBoxLogicalWidth/Height)
// Note that they may re-size themselves.
auto flexContainerIsHorizontal = flexBox().writingMode().isHorizontal();
for (auto& layoutBox : formattingContextBoxes(flexBox())) {
auto& renderer = downcast<RenderBox>(*layoutBox.rendererForIntegration());
auto isOrthogonal = flexContainerIsHorizontal != renderer.writingMode().isHorizontal();
auto borderBox = Layout::BoxGeometry::borderBoxRect(layoutState().geometryForBox(layoutBox));
renderer.setWidth(LayoutUnit { });
renderer.setHeight(LayoutUnit { });
// logical here means width and height constraints for the _content_ of the flex items not the flex items' own dimension inside the flex container.
renderer.setOverridingBorderBoxLogicalWidth(isOrthogonal ? borderBox.height() : borderBox.width());
renderer.setOverridingBorderBoxLogicalHeight(isOrthogonal ? borderBox.width() : borderBox.height());
renderer.setChildNeedsLayout(MarkOnlyThis);
renderer.layoutIfNeeded();
renderer.clearOverridingSize();
renderer.setWidth(flexContainerIsHorizontal ? borderBox.width() : borderBox.height());
renderer.setHeight(flexContainerIsHorizontal ? borderBox.height() : borderBox.width());
}
};
relayoutFlexItems();
}
void FlexLayout::updateRenderers()
{
auto flexContainerIsHorizontal = flexBox().writingMode().isHorizontal();
for (auto& layoutBox : formattingContextBoxes(flexBox())) {
auto& renderer = downcast<RenderBox>(*layoutBox.rendererForIntegration());
auto& flexItemGeometry = layoutState().geometryForBox(layoutBox);
auto borderBox = Layout::BoxGeometry::borderBoxRect(flexItemGeometry);
renderer.setLocation(flexContainerIsHorizontal ? borderBox.topLeft() : borderBox.topLeft().transposedPoint());
renderer.setWidth(flexContainerIsHorizontal ? borderBox.width() : borderBox.height());
renderer.setHeight(flexContainerIsHorizontal ? borderBox.height() : borderBox.width());
renderer.setMarginStart(flexItemGeometry.marginStart());
renderer.setMarginEnd(flexItemGeometry.marginEnd());
renderer.setMarginBefore(flexItemGeometry.marginBefore());
renderer.setMarginAfter(flexItemGeometry.marginAfter());
if (!renderer.everHadLayout() || renderer.checkForRepaintDuringLayout())
renderer.repaint();
}
}
void FlexLayout::paint(PaintInfo&, const LayoutPoint&)
{
}
bool FlexLayout::hitTest(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction)
{
return false;
}
void FlexLayout::collectOverflow()
{
}
LayoutUnit FlexLayout::contentBoxLogicalHeight() const
{
auto contentLogicalBottom = LayoutUnit { };
for (auto& layoutBox : formattingContextBoxes(flexBox()))
contentLogicalBottom = std::max(contentLogicalBottom, Layout::BoxGeometry::marginBoxRect(layoutState().geometryForBox(layoutBox)).bottom());
return contentLogicalBottom - layoutState().geometryForBox(flexBox()).contentBoxTop();
}
}
}
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