RenderFlexibleBox.h   [plain text]

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *     * Redistributions in binary form must reproduce the above
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 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef RenderFlexibleBox_h
#define RenderFlexibleBox_h

#include "RenderBlock.h"

namespace WebCore {

class RenderFlexibleBox : public RenderBlock {
public:
    RenderFlexibleBox(Node*);
    virtual ~RenderFlexibleBox();

    virtual const char* renderName() const;

    virtual bool isFlexibleBox() const { return true; }
    virtual void computePreferredLogicalWidths();
    virtual void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0);

    bool isHorizontalFlow() const;

private:
    enum FlexSign {
        PositiveFlexibility,
        NegativeFlexibility,
    };

    struct FlexOrderHashTraits;
    typedef HashSet<int, DefaultHash<int>::Hash, FlexOrderHashTraits> FlexOrderHashSet;

    class FlexOrderIterator;
    typedef WTF::HashMap<const RenderBox*, LayoutUnit> InflexibleFlexItemSize;
    typedef WTF::Vector<RenderBox*> OrderedFlexItemList;

    struct LineContext;
    struct Violation;

    bool hasOrthogonalFlow(RenderBox* child) const;
    bool isColumnFlow() const;
    bool isLeftToRightFlow() const;
    bool isMultiline() const;
    Length crossAxisLength() const;
    Length preferredLengthForChild(RenderBox* child) const;
    void setCrossAxisExtent(LayoutUnit);
    LayoutUnit crossAxisExtentForChild(RenderBox* child);
    LayoutUnit mainAxisExtentForChild(RenderBox* child);
    LayoutUnit crossAxisExtent() const;
    LayoutUnit mainAxisExtent() const;
    LayoutUnit crossAxisContentExtent() const;
    LayoutUnit mainAxisContentExtent() const;
    WritingMode transformedWritingMode() const;
    LayoutUnit flowAwareBorderStart() const;
    LayoutUnit flowAwareBorderEnd() const;
    LayoutUnit flowAwareBorderBefore() const;
    LayoutUnit flowAwareBorderAfter() const;
    LayoutUnit flowAwarePaddingStart() const;
    LayoutUnit flowAwarePaddingEnd() const;
    LayoutUnit flowAwarePaddingBefore() const;
    LayoutUnit flowAwarePaddingAfter() const;
    LayoutUnit flowAwareMarginStartForChild(RenderBox* child) const;
    LayoutUnit flowAwareMarginEndForChild(RenderBox* child) const;
    LayoutUnit flowAwareMarginBeforeForChild(RenderBox* child) const;
    LayoutUnit flowAwareMarginAfterForChild(RenderBox* child) const;
    LayoutUnit crossAxisMarginExtentForChild(RenderBox* child) const;
    LayoutUnit crossAxisScrollbarExtent() const;
    LayoutPoint flowAwareLocationForChild(RenderBox* child) const;
    // FIXME: Supporting layout deltas.
    void setFlowAwareLocationForChild(RenderBox* child, const LayoutPoint&);
    void adjustAlignmentForChild(RenderBox* child, LayoutUnit);
    LayoutUnit mainAxisBorderAndPaddingExtentForChild(RenderBox* child) const;
    LayoutUnit mainAxisScrollbarExtentForChild(RenderBox* child) const;
    LayoutUnit preferredMainAxisContentExtentForChild(RenderBox* child) const;

    void layoutFlexItems(FlexOrderIterator&, WTF::Vector<LineContext>&);
    void repositionLogicalHeightDependentFlexItems(FlexOrderIterator&, WTF::Vector<LineContext>&, LayoutUnit& oldClientAfterEdge);

    LayoutUnit availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, RenderBox*);
    LayoutUnit marginBoxAscentForChild(RenderBox*);

    void computeMainAxisPreferredSizes(bool relayoutChildren, FlexOrderHashSet&);
    LayoutUnit lineBreakLength();
    LayoutUnit adjustChildSizeForMinAndMax(RenderBox*, LayoutUnit childSize, LayoutUnit flexboxAvailableContentExtent);
    bool computeNextFlexLine(FlexOrderIterator&, OrderedFlexItemList& orderedChildren, LayoutUnit& preferredMainAxisExtent, float& totalPositiveFlexibility, float& totalNegativeFlexibility, LayoutUnit& minMaxAppliedMainAxisExtent);
    LayoutUnit computeAvailableFreeSpace(LayoutUnit preferredMainAxisExtent);

    bool resolveFlexibleLengths(FlexSign, const OrderedFlexItemList&, LayoutUnit& availableFreeSpace, float& totalPositiveFlexibility, float& totalNegativeFlexibility, InflexibleFlexItemSize&, WTF::Vector<LayoutUnit>& childSizes);
    void freezeViolations(const WTF::Vector<Violation>&, LayoutUnit& availableFreeSpace, float& totalPositiveFlexibility, float& totalNegativeFlexibility, InflexibleFlexItemSize&);

    void setLogicalOverrideSize(RenderBox* child, LayoutUnit childPreferredSize);
    void prepareChildForPositionedLayout(RenderBox* child, LayoutUnit mainAxisOffset, LayoutUnit crossAxisOffset);
    void layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList&, const WTF::Vector<LayoutUnit>& childSizes, LayoutUnit availableFreeSpace, WTF::Vector<LineContext>&);
    void layoutColumnReverse(const OrderedFlexItemList&, const WTF::Vector<LayoutUnit>& childSizes, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace);
    void packFlexLines(FlexOrderIterator&, WTF::Vector<LineContext>&);
    void alignChildren(FlexOrderIterator&, const WTF::Vector<LineContext>&);
    void applyStretchAlignmentToChild(RenderBox*, LayoutUnit lineCrossAxisExtent);
    void flipForRightToLeftColumn(FlexOrderIterator&);
    void flipForWrapReverse(FlexOrderIterator&, const WTF::Vector<LineContext>&, LayoutUnit crossAxisStartEdge);
};

} // namespace WebCore

#endif // RenderFlexibleBox_h