michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef NS_SMILNULLTYPE_H_
michael@0: #define NS_SMILNULLTYPE_H_
michael@0: 
michael@0: #include "mozilla/Attributes.h"
michael@0: #include "nsISMILType.h"
michael@0: 
michael@0: class nsSMILNullType : public nsISMILType
michael@0: {
michael@0: public:
michael@0:   // Singleton for nsSMILValue objects to hold onto.
michael@0:   static nsSMILNullType*
michael@0:   Singleton()
michael@0:   {
michael@0:     static nsSMILNullType sSingleton;
michael@0:     return &sSingleton;
michael@0:   }
michael@0: 
michael@0: protected:
michael@0:   // nsISMILType Methods
michael@0:   // -------------------
michael@0:   virtual void Init(nsSMILValue& aValue) const MOZ_OVERRIDE {}
michael@0:   virtual void Destroy(nsSMILValue& aValue) const MOZ_OVERRIDE {}
michael@0:   virtual nsresult Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const MOZ_OVERRIDE;
michael@0: 
michael@0:   // The remaining methods should never be called, so although they're very
michael@0:   // simple they don't need to be inline.
michael@0:   virtual bool     IsEqual(const nsSMILValue& aLeft,
michael@0:                            const nsSMILValue& aRight) const MOZ_OVERRIDE;
michael@0:   virtual nsresult Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
michael@0:                        uint32_t aCount) const MOZ_OVERRIDE;
michael@0:   virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
michael@0:                                    const nsSMILValue& aTo,
michael@0:                                    double& aDistance) const MOZ_OVERRIDE;
michael@0:   virtual nsresult Interpolate(const nsSMILValue& aStartVal,
michael@0:                                const nsSMILValue& aEndVal,
michael@0:                                double aUnitDistance,
michael@0:                                nsSMILValue& aResult) const MOZ_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:   // Private constructor: prevent instances beyond my singleton.
michael@0:   MOZ_CONSTEXPR nsSMILNullType() {}
michael@0: };
michael@0: 
michael@0: #endif // NS_SMILNULLTYPE_H_