| /* |
| * 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 |
| |
| #if ENABLE(LAYOUT_FORMATTING_CONTEXT) |
| |
| #include "FormattingContext.h" |
| #include <wtf/HashMap.h> |
| #include <wtf/IsoMalloc.h> |
| |
| namespace WebCore { |
| |
| class LayoutUnit; |
| |
| namespace Layout { |
| |
| class BlockFormattingState; |
| class Box; |
| class FloatingContext; |
| |
| // This class implements the layout logic for block formatting contexts. |
| // https://www.w3.org/TR/CSS22/visuren.html#block-formatting |
| class BlockFormattingContext final : public FormattingContext { |
| WTF_MAKE_ISO_ALLOCATED(BlockFormattingContext); |
| public: |
| BlockFormattingContext(const ContainerBox& formattingContextRoot, BlockFormattingState&); |
| |
| void layoutInFlowContent(InvalidationState&, const HorizontalConstraints&, const VerticalConstraints&) override; |
| |
| private: |
| |
| template<typename T> |
| struct ConstraintsPair { |
| const T root; |
| const T containingBlock; |
| }; |
| void placeInFlowPositionedChildren(const ContainerBox&, const HorizontalConstraints&); |
| |
| void computeWidthAndMargin(const FloatingContext&, const Box&, const ConstraintsPair<HorizontalConstraints>&, const ConstraintsPair<VerticalConstraints>&); |
| void computeHeightAndMargin(const Box&, const HorizontalConstraints&, const VerticalConstraints&); |
| |
| void computeStaticHorizontalPosition(const Box&, const HorizontalConstraints&); |
| void computeStaticVerticalPosition(const Box&, const VerticalConstraints&); |
| void computePositionToAvoidFloats(const FloatingContext&, const Box&, const ConstraintsPair<HorizontalConstraints>&, const ConstraintsPair<VerticalConstraints>&); |
| void computeVerticalPositionForFloatClear(const FloatingContext&, const Box&); |
| |
| void precomputeVerticalPositionForAncestors(const Box&, const ConstraintsPair<HorizontalConstraints>&, const ConstraintsPair<VerticalConstraints>&); |
| void precomputeVerticalPositionForBoxAndAncestors(const Box&, const ConstraintsPair<HorizontalConstraints>&, const ConstraintsPair<VerticalConstraints>&); |
| |
| IntrinsicWidthConstraints computedIntrinsicWidthConstraints() override; |
| LayoutUnit verticalPositionWithMargin(const Box&, const UsedVerticalMargin&, const VerticalConstraints&) const; |
| |
| // This class implements positioning and sizing for boxes participating in a block formatting context. |
| class Geometry : public FormattingContext::Geometry { |
| public: |
| ContentHeightAndMargin inFlowHeightAndMargin(const Box&, const HorizontalConstraints&, const OverrideVerticalValues&); |
| ContentWidthAndMargin inFlowWidthAndMargin(const Box&, const HorizontalConstraints&, const OverrideHorizontalValues&); |
| |
| Point staticPosition(const Box&, const HorizontalConstraints&, const VerticalConstraints&) const; |
| LayoutUnit staticVerticalPosition(const Box&, const VerticalConstraints&) const; |
| LayoutUnit staticHorizontalPosition(const Box&, const HorizontalConstraints&) const; |
| |
| IntrinsicWidthConstraints intrinsicWidthConstraints(const Box&); |
| |
| private: |
| friend class BlockFormattingContext; |
| Geometry(const BlockFormattingContext&); |
| |
| ContentHeightAndMargin inFlowNonReplacedHeightAndMargin(const Box&, const HorizontalConstraints&, const OverrideVerticalValues&); |
| ContentWidthAndMargin inFlowNonReplacedWidthAndMargin(const Box&, const HorizontalConstraints&, const OverrideHorizontalValues&) const; |
| ContentWidthAndMargin inFlowReplacedWidthAndMargin(const ReplacedBox&, const HorizontalConstraints&, const OverrideHorizontalValues&) const; |
| Point staticPositionForOutOfFlowPositioned(const Box&) const; |
| |
| const BlockFormattingContext& formattingContext() const { return downcast<BlockFormattingContext>(FormattingContext::Geometry::formattingContext()); } |
| }; |
| BlockFormattingContext::Geometry geometry() const { return Geometry(*this); } |
| |
| // This class implements margin collapsing for block formatting context. |
| class MarginCollapse { |
| public: |
| struct CollapsedAndPositiveNegativeValues { |
| UsedVerticalMargin::CollapsedValues collapsedValues; |
| PositiveAndNegativeVerticalMargin positiveAndNegativeVerticalValues; |
| }; |
| CollapsedAndPositiveNegativeValues collapsedVerticalValues(const Box&, UsedVerticalMargin::NonCollapsedValues); |
| |
| PrecomputedMarginBefore precomputedMarginBefore(const Box&, UsedVerticalMargin::NonCollapsedValues); |
| LayoutUnit marginBeforeIgnoringCollapsingThrough(const Box&, UsedVerticalMargin::NonCollapsedValues); |
| static void updateMarginAfterForPreviousSibling(BlockFormattingContext&, const MarginCollapse&, const Box&); |
| |
| bool marginBeforeCollapsesWithParentMarginBefore(const Box&) const; |
| bool marginBeforeCollapsesWithFirstInFlowChildMarginBefore(const Box&) const; |
| bool marginBeforeCollapsesWithParentMarginAfter(const Box&) const; |
| bool marginBeforeCollapsesWithPreviousSiblingMarginAfter(const Box&) const; |
| |
| bool marginAfterCollapsesWithParentMarginAfter(const Box&) const; |
| bool marginAfterCollapsesWithLastInFlowChildMarginAfter(const Box&) const; |
| bool marginAfterCollapsesWithParentMarginBefore(const Box&) const; |
| bool marginAfterCollapsesWithNextSiblingMarginBefore(const Box&) const; |
| bool marginAfterCollapsesWithSiblingMarginBeforeWithClearance(const Box&) const; |
| |
| bool marginsCollapseThrough(const Box&) const; |
| |
| private: |
| friend class BlockFormattingContext; |
| MarginCollapse(const BlockFormattingContext&); |
| |
| enum class MarginType { Before, After }; |
| PositiveAndNegativeVerticalMargin::Values positiveNegativeValues(const Box&, MarginType) const; |
| PositiveAndNegativeVerticalMargin::Values positiveNegativeMarginBefore(const Box&, UsedVerticalMargin::NonCollapsedValues) const; |
| PositiveAndNegativeVerticalMargin::Values positiveNegativeMarginAfter(const Box&, UsedVerticalMargin::NonCollapsedValues) const; |
| |
| PositiveAndNegativeVerticalMargin::Values precomputedPositiveNegativeMarginBefore(const Box&, UsedVerticalMargin::NonCollapsedValues) const; |
| PositiveAndNegativeVerticalMargin::Values precomputedPositiveNegativeValues(const Box&) const; |
| |
| PositiveAndNegativeVerticalMargin::Values computedPositiveAndNegativeMargin(PositiveAndNegativeVerticalMargin::Values, PositiveAndNegativeVerticalMargin::Values) const; |
| Optional<LayoutUnit> marginValue(PositiveAndNegativeVerticalMargin::Values) const; |
| |
| bool hasClearance(const Box&) const; |
| |
| LayoutState& layoutState() { return m_blockFormattingContext.layoutState(); } |
| const LayoutState& layoutState() const { return m_blockFormattingContext.layoutState(); } |
| const BlockFormattingContext& formattingContext() const { return m_blockFormattingContext; } |
| |
| const BlockFormattingContext& m_blockFormattingContext; |
| }; |
| MarginCollapse marginCollapse() const { return MarginCollapse(*this); } |
| |
| class Quirks : public FormattingContext::Quirks { |
| public: |
| bool needsStretching(const Box&) const; |
| LayoutUnit stretchedInFlowHeight(const Box&, ContentHeightAndMargin); |
| |
| bool shouldIgnoreCollapsedQuirkMargin(const Box&) const; |
| bool shouldIgnoreMarginBefore(const Box&) const; |
| bool shouldIgnoreMarginAfter(const Box&) const; |
| |
| private: |
| friend class BlockFormattingContext; |
| Quirks(const BlockFormattingContext&); |
| |
| const BlockFormattingContext& formattingContext() const { return downcast<BlockFormattingContext>(FormattingContext::Quirks::formattingContext()); } |
| |
| }; |
| BlockFormattingContext::Quirks quirks() const { return Quirks(*this); } |
| |
| Optional<LayoutUnit> usedAvailableWidthForFloatAvoider(const FloatingContext&, const Box&, const ConstraintsPair<HorizontalConstraints>&, const ConstraintsPair<VerticalConstraints>&); |
| |
| const BlockFormattingState& formattingState() const { return downcast<BlockFormattingState>(FormattingContext::formattingState()); } |
| BlockFormattingState& formattingState() { return downcast<BlockFormattingState>(FormattingContext::formattingState()); } |
| |
| #if ASSERT_ENABLED |
| void setPrecomputedMarginBefore(const Box& layoutBox, const PrecomputedMarginBefore& precomputedMarginBefore) { m_precomputedMarginBeforeList.set(&layoutBox, precomputedMarginBefore); } |
| PrecomputedMarginBefore precomputedMarginBefore(const Box& layoutBox) const { return m_precomputedMarginBeforeList.get(&layoutBox); } |
| bool hasPrecomputedMarginBefore(const Box& layoutBox) const { return m_precomputedMarginBeforeList.contains(&layoutBox); } |
| #endif |
| private: |
| HashMap<const Box*, PrecomputedMarginBefore> m_precomputedMarginBeforeList; |
| }; |
| |
| inline BlockFormattingContext::Geometry::Geometry(const BlockFormattingContext& blockFormattingContext) |
| : FormattingContext::Geometry(blockFormattingContext) |
| { |
| } |
| |
| inline BlockFormattingContext::Quirks::Quirks(const BlockFormattingContext& blockFormattingContext) |
| : FormattingContext::Quirks(blockFormattingContext) |
| { |
| } |
| |
| inline BlockFormattingContext::MarginCollapse::MarginCollapse(const BlockFormattingContext& blockFormattingContext) |
| : m_blockFormattingContext(blockFormattingContext) |
| { |
| } |
| |
| } |
| } |
| |
| SPECIALIZE_TYPE_TRAITS_LAYOUT_FORMATTING_CONTEXT(BlockFormattingContext, isBlockFormattingContext()) |
| |
| #endif |