| /* |
| * 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 "MarginTypes.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 : public FormattingContext { |
| WTF_MAKE_ISO_ALLOCATED(BlockFormattingContext); |
| public: |
| BlockFormattingContext(const Box& formattingContextRoot, BlockFormattingState&); |
| |
| void layout() const override; |
| |
| private: |
| void layoutFormattingContextRoot(FloatingContext&, const Box&) const; |
| void placeInFlowPositionedChildren(const Box&) const; |
| |
| void computeWidthAndMargin(const Box&) const; |
| void computeHeightAndMargin(const Box&) const; |
| |
| void computeStaticPosition(const FloatingContext&, const Box&) const; |
| void computeFloatingPosition(const FloatingContext&, const Box&) const; |
| void computePositionToAvoidFloats(const FloatingContext&, const Box&) const; |
| |
| void computeEstimatedVerticalPosition(const Box&) const; |
| void computeEstimatedVerticalPositionForAncestors(const Box&) const; |
| void computeEstimatedVerticalPositionForFormattingRoot(const Box&) const; |
| void computeEstimatedVerticalPositionForFloatClear(const FloatingContext&, const Box&) const; |
| |
| void computeIntrinsicWidthConstraints() const override; |
| LayoutUnit verticalPositionWithMargin(const Box&, const UsedVerticalMargin&) const; |
| |
| // This class implements positioning and sizing for boxes participating in a block formatting context. |
| class Geometry : public FormattingContext::Geometry { |
| public: |
| static HeightAndMargin inFlowHeightAndMargin(const LayoutState&, const Box&, UsedVerticalValues); |
| static WidthAndMargin inFlowWidthAndMargin(const LayoutState&, const Box&, UsedHorizontalValues); |
| |
| static Point staticPosition(const LayoutState&, const Box&); |
| |
| static bool intrinsicWidthConstraintsNeedChildrenWidth(const Box&); |
| static IntrinsicWidthConstraints intrinsicWidthConstraints(const LayoutState&, const Box&); |
| |
| private: |
| static HeightAndMargin inFlowNonReplacedHeightAndMargin(const LayoutState&, const Box&, UsedVerticalValues); |
| static WidthAndMargin inFlowNonReplacedWidthAndMargin(const LayoutState&, const Box&, UsedHorizontalValues); |
| static WidthAndMargin inFlowReplacedWidthAndMargin(const LayoutState&, const Box&, UsedHorizontalValues); |
| static Point staticPositionForOutOfFlowPositioned(const LayoutState&, const Box&); |
| }; |
| |
| // This class implements margin collapsing for block formatting context. |
| class MarginCollapse { |
| public: |
| static UsedVerticalMargin::CollapsedValues collapsedVerticalValues(const LayoutState&, const Box&, const UsedVerticalMargin::NonCollapsedValues&); |
| |
| static EstimatedMarginBefore estimatedMarginBefore(const LayoutState&, const Box&); |
| static LayoutUnit marginBeforeIgnoringCollapsingThrough(const LayoutState&, const Box&, const UsedVerticalMargin::NonCollapsedValues&); |
| static void updateMarginAfterForPreviousSibling(const LayoutState&, const Box&); |
| static void updatePositiveNegativeMarginValues(const LayoutState&, const Box&); |
| |
| static bool marginBeforeCollapsesWithParentMarginBefore(const LayoutState&, const Box&); |
| static bool marginBeforeCollapsesWithFirstInFlowChildMarginBefore(const LayoutState&, const Box&); |
| static bool marginBeforeCollapsesWithParentMarginAfter(const LayoutState&, const Box&); |
| static bool marginBeforeCollapsesWithPreviousSiblingMarginAfter(const LayoutState&, const Box&); |
| |
| static bool marginAfterCollapsesWithParentMarginAfter(const LayoutState&, const Box&); |
| static bool marginAfterCollapsesWithLastInFlowChildMarginAfter(const LayoutState&, const Box&); |
| static bool marginAfterCollapsesWithParentMarginBefore(const LayoutState&, const Box&); |
| static bool marginAfterCollapsesWithNextSiblingMarginBefore(const LayoutState&, const Box&); |
| static bool marginAfterCollapsesWithSiblingMarginBeforeWithClearance(const LayoutState&, const Box&); |
| |
| static bool marginsCollapseThrough(const LayoutState&, const Box&); |
| |
| private: |
| enum class MarginType { Before, After }; |
| static PositiveAndNegativeVerticalMargin::Values positiveNegativeValues(const LayoutState&, const Box&, MarginType); |
| static PositiveAndNegativeVerticalMargin::Values positiveNegativeMarginBefore(const LayoutState&, const Box&, const UsedVerticalMargin::NonCollapsedValues&); |
| static PositiveAndNegativeVerticalMargin::Values positiveNegativeMarginAfter(const LayoutState&, const Box&, const UsedVerticalMargin::NonCollapsedValues&); |
| }; |
| |
| class Quirks { |
| public: |
| static bool needsStretching(const LayoutState&, const Box&); |
| static HeightAndMargin stretchedInFlowHeight(const LayoutState&, const Box&, HeightAndMargin); |
| |
| static bool shouldIgnoreCollapsedQuirkMargin(const LayoutState&, const Box&); |
| static bool shouldIgnoreMarginBefore(const LayoutState&, const Box&); |
| static bool shouldIgnoreMarginAfter(const LayoutState&, const Box&); |
| }; |
| |
| void setEstimatedMarginBefore(const Box&, const EstimatedMarginBefore&) const; |
| void removeEstimatedMarginBefore(const Box& layoutBox) const { m_estimatedMarginBeforeList.remove(&layoutBox); } |
| bool hasEstimatedMarginBefore(const Box&) const; |
| #ifndef NDEBUG |
| EstimatedMarginBefore estimatedMarginBefore(const Box& layoutBox) const { return m_estimatedMarginBeforeList.get(&layoutBox); } |
| bool hasPrecomputedMarginBefore(const Box&) const; |
| #endif |
| |
| BlockFormattingState& formattingState() const { return downcast<BlockFormattingState>(FormattingContext::formattingState()); } |
| |
| private: |
| mutable HashMap<const Box*, EstimatedMarginBefore> m_estimatedMarginBeforeList; |
| }; |
| |
| } |
| } |
| #endif |