Source/core/dom/PseudoElement.h

/*
 * 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.
 *     * 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,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef PseudoElement_h
#define PseudoElement_h

#include "core/dom/Element.h"
#include "core/rendering/style/RenderStyle.h"

namespace blink {

class PseudoElement final : public Element {
public:
    static PassRefPtrWillBeRawPtr<PseudoElement> create(Element* parent, PseudoId pseudoId)
    {
        return adoptRefWillBeNoop(new PseudoElement(parent, pseudoId));
    }

    virtual PassRefPtr<RenderStyle> customStyleForRenderer() override;
    virtual void attach(const AttachContext& = AttachContext()) override;
    virtual bool rendererIsNeeded(const RenderStyle&) override;

    virtual bool canStartSelection() const override { return false; }
    virtual bool canContainRangeEndPoint() const override { return false; }
    virtual PseudoId pseudoId() const override { return m_pseudoId; }

    static String pseudoElementNameForEvents(PseudoId);

    void dispose();

private:
    PseudoElement(Element*, PseudoId);

    virtual void didRecalcStyle(StyleRecalcChange) override;

    PseudoId m_pseudoId;
};

const QualifiedName& pseudoElementTagName();

inline bool pseudoElementRendererIsNeeded(const RenderStyle* style)
{
    return style && style->display() != NONE && (style->styleType() == BACKDROP || style->contentData());
}

DEFINE_ELEMENT_TYPE_CASTS(PseudoElement, isPseudoElement());

} // namespace

#endif