ContentDistributor.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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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#ifndef ContentDistributor_h
#define ContentDistributor_h

#include <wtf/Forward.h>
#include <wtf/HashMap.h>
#include <wtf/RefCounted.h>
#include <wtf/Vector.h>

namespace WebCore {

class ContainerNode;
class Element;
class InsertionPoint;
class Node;
class ShadowRoot;

class ContentDistributor {
    WTF_MAKE_NONCOPYABLE(ContentDistributor);
public:
    enum Validity {
        Valid = 0,
        Invalidated = 1,
        Invalidating = 2,
        Undetermined = 3
    };

    ContentDistributor();
    ~ContentDistributor();

    void invalidateInsertionPointList();
    
    InsertionPoint* findInsertionPointFor(const Node* key) const;

    void distributeSelectionsTo(InsertionPoint*, Element* host);

    void invalidateDistribution(Element* host);
    void didShadowBoundaryChange(Element* host);

    static void ensureDistribution(ShadowRoot*);

private:
    const Vector<RefPtr<InsertionPoint> >& ensureInsertionPointList(ShadowRoot*);

    void distribute(Element* host);
    bool invalidate(Element* host);

    void setValidity(Validity validity) { m_validity = validity; }
    bool isValid() const { return m_validity == Valid; }
    bool needsDistribution() const;
    bool needsInvalidation() const { return m_validity != Invalidated; }

    Vector<RefPtr<InsertionPoint> > m_insertionPointList;
    HashMap<const Node*, RefPtr<InsertionPoint> > m_nodeToInsertionPoint;
    bool m_insertionPointListIsValid;
    unsigned m_validity : 2;
};

inline bool ContentDistributor::needsDistribution() const
{
    // During the invalidation, re-distribution should be supressed.
    return m_validity != Valid && m_validity != Invalidating;
}

}

#endif