Source/WebCore/svg/properties/SVGStaticPropertyTearOff.h

/*
 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#pragma once

namespace WebCore {

#if COMPILER(MSVC)
// UpdateMethod is 12 bytes. We have to pack to a size greater than or equal to that to avoid an
// alignment warning (C4121). 16 is the next-largest size allowed for packing, so we use that.
#pragma pack(push, 16)
#endif
template<typename ContextElement, typename PropertyTearOff>
class SVGStaticPropertyTearOff final : public PropertyTearOff {
public:
    using Self = SVGStaticPropertyTearOff<ContextElement, PropertyTearOff>;
    using PropertyType = typename PropertyTearOff::PropertyType;

    typedef void (ContextElement::*UpdateMethod)();

    // Used for non-animated POD types that are not associated with a SVGAnimatedProperty object, nor with a XML DOM attribute
    // (for example: SVGSVGElement::currentTranslate).
    static Ref<Self> create(ContextElement& contextElement, PropertyType& value, UpdateMethod update)
    {
        return adoptRef(*new Self(contextElement, value, update));
    }

    void commitChange() final { (m_contextElement.get()->*m_update)(); }

private:
    SVGStaticPropertyTearOff(ContextElement& contextElement, PropertyType& value, UpdateMethod update)
        : PropertyTearOff(UndefinedRole, value)
        , m_update(update)
        , m_contextElement(&contextElement)
    {
    }

    UpdateMethod m_update;
    RefPtr<ContextElement> m_contextElement;
};
#if COMPILER(MSVC)
#pragma pack(pop)
#endif

} // namespace WebCore