InsertionPoint.h   [plain text]

/*
 * Copyright (C) 2012 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * 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
 * "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 THE COPYRIGHT
 * OWNER OR 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,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef InsertionPoint_h
#define InsertionPoint_h

#include "HTMLContentSelector.h"
#include "HTMLElement.h"
#include "HTMLNames.h"
#include <wtf/Forward.h>

namespace WebCore {

class InsertionPoint : public HTMLElement {
public:
    virtual ~InsertionPoint();

    const HTMLContentSelectionList* selections() const { return &m_selections; }
    bool hasSelection() const { return m_selections.first(); }
    bool isShadowBoundary() const;
    bool isActive() const;

    virtual const AtomicString& select() const = 0;
    virtual bool isSelectValid() const = 0;
    virtual bool doesSelectFromHostChildren() const = 0;

    virtual void attach();
    virtual void detach();

    virtual bool isInsertionPoint() const OVERRIDE { return true; }
    ShadowRoot* assignedFrom() const;

protected:
    InsertionPoint(const QualifiedName&, Document*);
    virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE;

private:
    void distributeHostChildren(ShadowTree*);
    void clearDistribution(ShadowTree*);
    void attachDistributedNode();

    void assignShadowRoot(ShadowRoot*);
    void clearAssignment(ShadowRoot*);

    HTMLContentSelectionList m_selections;
};

inline bool isInsertionPoint(const Node* node)
{
    if (!node)
        return true;

    if (node->isHTMLElement() && toHTMLElement(node)->isInsertionPoint())
        return true;

    return false;
}

inline InsertionPoint* toInsertionPoint(Node* node)
{
    ASSERT(isInsertionPoint(node));
    return static_cast<InsertionPoint*>(node);
}

inline const InsertionPoint* toInsertionPoint(const Node* node)
{
    ASSERT(isInsertionPoint(node));
    return static_cast<const InsertionPoint*>(node);
}

inline bool isShadowBoundary(Node* node)
{
    if (!isInsertionPoint(node))
        return false;
    return toInsertionPoint(node)->isShadowBoundary();
}

} // namespace WebCore

#endif // InsertionPoint_h