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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 "HitTestLocation.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "LayoutBoxGeometry.h"
#include "LayoutChildIterator.h"
#include "RenderBoxInlines.h"
#include "RenderFlexibleBox.h"
#include "RenderView.h"
namespace WebCore {
namespace LayoutIntegration {
FlexLayout::FlexLayout(RenderFlexibleBox& flexBoxRenderer)
: m_boxTree(flexBoxRenderer)
, m_layoutState(flexBoxRenderer.view().layoutState())
, m_flexFormattingState(layoutState().ensureFlexFormattingState(flexBox()))
{
}
// FIXME: Merge these with the other integration layout functions.
static inline Layout::Edges flexBoxLogicalBorder(const RenderBoxModelObject& renderer, bool isLeftToRightInlineDirection, WritingMode writingMode)
{
UNUSED_PARAM(isLeftToRightInlineDirection);
UNUSED_PARAM(writingMode);
auto borderLeft = renderer.borderLeft();
auto borderRight = renderer.borderRight();
auto borderTop = renderer.borderTop();
auto borderBottom = renderer.borderBottom();
return { { borderLeft, borderRight }, { borderTop, borderBottom } };
}
static inline Layout::Edges flexBoxLogicalPadding(const RenderBoxModelObject& renderer, bool isLeftToRightInlineDirection, WritingMode writingMode)
{
UNUSED_PARAM(isLeftToRightInlineDirection);
UNUSED_PARAM(writingMode);
auto paddingLeft = renderer.paddingLeft();
auto paddingRight = renderer.paddingRight();
auto paddingTop = renderer.paddingTop();
auto paddingBottom = renderer.paddingBottom();
return { { paddingLeft, paddingRight }, { paddingTop, paddingBottom } };
}
void FlexLayout::updateFormattingRootGeometryAndInvalidate()
{
auto updateGeometry = [&](auto& root) {
auto& flexBoxRenderer = this->flexBoxRenderer();
auto isLeftToRightInlineDirection = flexBoxRenderer.style().isLeftToRightDirection();
auto writingMode = flexBoxRenderer.style().writingMode();
root.setContentBoxWidth(writingMode == WritingMode::TopToBottom ? flexBoxRenderer.contentWidth() : flexBoxRenderer.contentHeight());
root.setPadding(flexBoxLogicalPadding(flexBoxRenderer, isLeftToRightInlineDirection, writingMode));
root.setBorder(flexBoxLogicalBorder(flexBoxRenderer, isLeftToRightInlineDirection, writingMode));
root.setHorizontalMargin({ });
root.setVerticalMargin({ });
};
updateGeometry(layoutState().ensureGeometryForBox(flexBox()));
for (auto& flexItem : Layout::childrenOfType<Layout::Box>(flexBox()))
m_flexFormattingState.clearIntrinsicWidthConstraints(flexItem);
}
void FlexLayout::updateFlexItemDimensions(const RenderBlock& flexItem, LayoutUnit minimumContentSize, LayoutUnit maximumContentSize)
{
auto& rootGeometry = layoutState().geometryForBox(flexBox());
auto& layoutBox = m_boxTree.layoutBoxForRenderer(flexItem);
auto& boxGeometry = layoutState().ensureGeometryForBox(layoutBox);
auto& style = flexItem.style();
boxGeometry.setVerticalMargin({ flexItem.marginTop(), flexItem.marginBottom() });
boxGeometry.setHorizontalMargin({ flexItem.marginLeft(), flexItem.marginRight() });
boxGeometry.setBorder({ { flexItem.borderLeft(), flexItem.borderRight() }, { flexItem.borderTop(), flexItem.borderBottom() } });
boxGeometry.setPadding(Layout::Edges { { flexItem.paddingLeft(), flexItem.paddingRight() }, { flexItem.paddingTop(), flexItem.paddingBottom() } });
if (style.width().isFixed() || style.width().isPercentOrCalculated()) {
auto widthValue = minimumValueForLength(style.width(), rootGeometry.contentBoxWidth());
if (style.boxSizing() == BoxSizing::BorderBox)
widthValue = std::max(0_lu, widthValue - boxGeometry.horizontalBorderAndPadding());
boxGeometry.setContentBoxWidth(widthValue);
}
if (style.height().isFixed()) {
auto heightValue = LayoutUnit { style.height().value() };
if (style.boxSizing() == BoxSizing::BorderBox)
heightValue = std::max(0_lu, heightValue - boxGeometry.verticalBorderAndPadding());
boxGeometry.setContentBoxHeight(heightValue);
}
m_flexFormattingState.setIntrinsicWidthConstraintsForBox(layoutBox, { minimumContentSize, maximumContentSize });
}
void FlexLayout::updateStyle(const RenderBlock&, const RenderStyle&)
{
}
std::pair<LayoutUnit, LayoutUnit> FlexLayout::computeIntrinsicWidthConstraints()
{
auto flexFormattingContext = Layout::FlexFormattingContext { flexBox(), m_flexFormattingState };
auto constraints = flexFormattingContext.computedIntrinsicWidthConstraints();
return { constraints.minimum, constraints.maximum };
}
void FlexLayout::layout()
{
auto& rootGeometry = layoutState().geometryForBox(flexBox());
auto horizontalConstraints = Layout::HorizontalConstraints { rootGeometry.contentBoxLeft(), rootGeometry.contentBoxWidth() };
auto verticalSpaceForFlexItems = [&]() -> std::tuple<std::optional<LayoutUnit>, std::optional<LayoutUnit>> {
auto& flexBoxStyle = flexBox().style();
auto adjustedHeightValue = [&](auto& property) -> std::optional<LayoutUnit> {
if (!property.isFixed())
return { };
auto boxSizingIsContentBox = flexBoxStyle.boxSizing() == BoxSizing::ContentBox;
return LayoutUnit { boxSizingIsContentBox ? property.value() : property.value() - rootGeometry.verticalMarginBorderAndPadding() };
};
auto verticalSpace = adjustedHeightValue(flexBoxStyle.logicalHeight());
if (auto maximumHeightValue = adjustedHeightValue(flexBoxStyle.logicalMaxHeight()))
verticalSpace = verticalSpace ? std::min(*verticalSpace, *maximumHeightValue) : *maximumHeightValue;
return { verticalSpace, adjustedHeightValue(flexBoxStyle.logicalMinHeight()) };
};
auto [availableVerticalSpace, minimumVerticalSpace] = verticalSpaceForFlexItems();
auto constraints = Layout::ConstraintsForFlexContent { { horizontalConstraints, rootGeometry.contentBoxTop() }, availableVerticalSpace, minimumVerticalSpace };
auto flexFormattingContext = Layout::FlexFormattingContext { flexBox(), m_flexFormattingState };
flexFormattingContext.layout(constraints);
updateRenderers();
auto relayoutFlexItems = [&] {
// Flex items need to be laid out now with their final size (and through setOverridingLogicalWidth/Height)
// Note that they may re-size themselves.
for (auto& renderObject : m_boxTree.renderers()) {
auto& renderer = downcast<RenderBox>(*renderObject);
auto& layoutBox = *renderer.layoutBox();
auto borderBox = Layout::BoxGeometry::borderBoxRect(m_flexFormattingState.boxGeometry(layoutBox));
renderer.setWidth(LayoutUnit { });
renderer.setHeight(LayoutUnit { });
// FIXME: This may need a visual vs. logical flip.
renderer.setOverridingLogicalWidth(borderBox.width());
renderer.setOverridingLogicalHeight(borderBox.height());
renderer.setChildNeedsLayout(MarkOnlyThis);
renderer.layoutIfNeeded();
renderer.clearOverridingContentSize();
renderer.setWidth(borderBox.width());
renderer.setHeight(borderBox.height());
}
};
relayoutFlexItems();
}
void FlexLayout::updateRenderers() const
{
for (auto& renderObject : m_boxTree.renderers()) {
auto& renderer = downcast<RenderBox>(*renderObject);
auto& layoutBox = *renderer.layoutBox();
auto& flexItemGeometry = m_flexFormattingState.boxGeometry(layoutBox);
auto borderBox = Layout::BoxGeometry::borderBoxRect(flexItemGeometry);
renderer.setLocation(borderBox.topLeft());
renderer.setWidth(borderBox.width());
renderer.setHeight(borderBox.height());
renderer.setMarginStart(flexItemGeometry.marginStart());
renderer.setMarginEnd(flexItemGeometry.marginEnd());
renderer.setMarginBefore(flexItemGeometry.marginBefore());
renderer.setMarginAfter(flexItemGeometry.marginAfter());
}
}
void FlexLayout::paint(PaintInfo&, const LayoutPoint&)
{
}
bool FlexLayout::hitTest(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction)
{
return false;
}
void FlexLayout::collectOverflow()
{
}
LayoutUnit FlexLayout::contentLogicalHeight() const
{
return Layout::FlexFormattingContext { flexBox(), m_flexFormattingState }.usedContentHeight();
}
}
}
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