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/*
* Copyright (C) 2018 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.
*/
#pragma once
#include "BlockFormattingGeometry.h"
#include "BlockFormattingQuirks.h"
#include "BlockFormattingState.h"
#include "FormattingContext.h"
#include <wtf/HashMap.h>
#include <wtf/IsoMalloc.h>
namespace WebCore {
class LayoutUnit;
namespace Layout {
class Box;
class BlockMarginCollapse;
class FloatingContext;
// This class implements the layout logic for block formatting contexts.
// https://www.w3.org/TR/CSS22/visuren.html#block-formatting
class BlockFormattingContext : public FormattingContext {
WTF_MAKE_ISO_ALLOCATED(BlockFormattingContext);
public:
BlockFormattingContext(const ElementBox& formattingContextRoot, BlockFormattingState&);
void layoutInFlowContent(const ConstraintsForInFlowContent&) override;
LayoutUnit usedContentHeight() const override;
const BlockFormattingState& formattingState() const { return downcast<BlockFormattingState>(FormattingContext::formattingState()); }
const BlockFormattingGeometry& formattingGeometry() const final { return m_blockFormattingGeometry; }
const BlockFormattingQuirks& formattingQuirks() const override { return m_blockFormattingQuirks; }
protected:
struct ConstraintsPair {
ConstraintsForInFlowContent formattingContextRoot;
ConstraintsForInFlowContent containingBlock;
};
void placeInFlowPositionedChildren(const ElementBox&, const HorizontalConstraints&);
void computeWidthAndMargin(const FloatingContext&, const ElementBox&, const ConstraintsPair&);
void computeHeightAndMargin(const ElementBox&, const ConstraintsForInFlowContent&);
void computeStaticHorizontalPosition(const ElementBox&, const HorizontalConstraints&);
void computeStaticVerticalPosition(const ElementBox&, LayoutUnit containingBlockContentBoxTop);
void computePositionToAvoidFloats(const FloatingContext&, const ElementBox&, const ConstraintsPair&);
void computeVerticalPositionForFloatClear(const FloatingContext&, const ElementBox&);
void precomputeVerticalPositionForBoxAndAncestors(const ElementBox&, const ConstraintsPair&);
IntrinsicWidthConstraints computedIntrinsicWidthConstraints() override;
LayoutUnit verticalPositionWithMargin(const ElementBox&, const UsedVerticalMargin&, LayoutUnit containingBlockContentBoxTop) const;
std::optional<LayoutUnit> usedAvailableWidthForFloatAvoider(const FloatingContext&, const ElementBox&, const ConstraintsPair&);
void updateMarginAfterForPreviousSibling(const ElementBox&);
BlockFormattingState& formattingState() { return downcast<BlockFormattingState>(FormattingContext::formattingState()); }
BlockMarginCollapse marginCollapse() const;
#if ASSERT_ENABLED
void setPrecomputedMarginBefore(const ElementBox& layoutBox, const PrecomputedMarginBefore& precomputedMarginBefore) { m_precomputedMarginBeforeList.set(&layoutBox, precomputedMarginBefore); }
PrecomputedMarginBefore precomputedMarginBefore(const ElementBox& layoutBox) const { return m_precomputedMarginBeforeList.get(&layoutBox); }
bool hasPrecomputedMarginBefore(const ElementBox& layoutBox) const { return m_precomputedMarginBeforeList.contains(&layoutBox); }
#endif
private:
#if ASSERT_ENABLED
HashMap<const ElementBox*, PrecomputedMarginBefore> m_precomputedMarginBeforeList;
#endif
const BlockFormattingGeometry m_blockFormattingGeometry;
const BlockFormattingQuirks m_blockFormattingQuirks;
};
}
}
SPECIALIZE_TYPE_TRAITS_LAYOUT_FORMATTING_CONTEXT(BlockFormattingContext, isBlockFormattingContext())
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