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      1 /*
      2  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #ifndef SVGStaticPropertyWithParentTearOff_h
     21 #define SVGStaticPropertyWithParentTearOff_h
     22 
     23 #if ENABLE(SVG)
     24 #include "SVGPropertyTearOff.h"
     25 
     26 namespace WebCore {
     27 
     28 #if COMPILER(MSVC)
     29 // UpdateMethod is 12 bytes. We have to pack to a size greater than or equal to that to avoid an
     30 // alignment warning (C4121). 16 is the next-largest size allowed for packing, so we use that.
     31 #pragma pack(push, 16)
     32 #endif
     33 template<typename ParentType, typename PropertyType>
     34 class SVGStaticPropertyWithParentTearOff : public SVGPropertyTearOff<PropertyType> {
     35 public:
     36     typedef SVGStaticPropertyWithParentTearOff<ParentType, PropertyType> Self;
     37     typedef void (ParentType::*UpdateMethod)();
     38 
     39     // Used for non-animated POD types that are not associated with a SVGAnimatedProperty object, nor with a XML DOM attribute
     40     // and that contain a parent type that's exposed to the bindings via a SVGStaticPropertyTearOff object
     41     // (for example: SVGTransform::matrix).
     42     static PassRefPtr<Self> create(SVGProperty* parent, PropertyType& value, UpdateMethod update)
     43     {
     44         ASSERT(parent);
     45         return adoptRef(new Self(parent, value, update));
     46     }
     47 
     48     virtual void commitChange()
     49     {
     50         (static_cast<SVGPropertyTearOff<ParentType>*>(m_parent.get())->propertyReference().*m_update)();
     51         m_parent->commitChange();
     52     }
     53 
     54 private:
     55     SVGStaticPropertyWithParentTearOff(SVGProperty* parent, PropertyType& value, UpdateMethod update)
     56         : SVGPropertyTearOff<PropertyType>(0, UndefinedRole, value)
     57         , m_update(update)
     58         , m_parent(parent)
     59     {
     60     }
     61 
     62     UpdateMethod m_update;
     63     RefPtr<SVGProperty> m_parent;
     64 };
     65 #if COMPILER(MSVC)
     66 #pragma pack(pop)
     67 #endif
     68 
     69 }
     70 
     71 #endif // ENABLE(SVG)
     72 #endif // SVGStaticPropertyWithParentTearOff_h
     73