The Tor Browser: dom/smil/nsSMILNullType.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef NS_SMILNULLTYPE_H_

     7 #define NS_SMILNULLTYPE_H_

     9 #include "mozilla/Attributes.h"

    10 #include "nsISMILType.h"

    12 class nsSMILNullType : public nsISMILType

    13 {

    14 public:

    15   // Singleton for nsSMILValue objects to hold onto.

    16   static nsSMILNullType*

    17   Singleton()

    18   {

    19     static nsSMILNullType sSingleton;

    20     return &sSingleton;

    21   }

    23 protected:

    24   // nsISMILType Methods

    25   // -------------------

    26   virtual void Init(nsSMILValue& aValue) const MOZ_OVERRIDE {}

    27   virtual void Destroy(nsSMILValue& aValue) const MOZ_OVERRIDE {}

    28   virtual nsresult Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const MOZ_OVERRIDE;

    30   // The remaining methods should never be called, so although they're very

    31   // simple they don't need to be inline.

    32   virtual bool     IsEqual(const nsSMILValue& aLeft,

    33                            const nsSMILValue& aRight) const MOZ_OVERRIDE;

    34   virtual nsresult Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,

    35                        uint32_t aCount) const MOZ_OVERRIDE;

    36   virtual nsresult ComputeDistance(const nsSMILValue& aFrom,

    37                                    const nsSMILValue& aTo,

    38                                    double& aDistance) const MOZ_OVERRIDE;

    39   virtual nsresult Interpolate(const nsSMILValue& aStartVal,

    40                                const nsSMILValue& aEndVal,

    41                                double aUnitDistance,

    42                                nsSMILValue& aResult) const MOZ_OVERRIDE;

    44 private:

    45   // Private constructor: prevent instances beyond my singleton.

    46   MOZ_CONSTEXPR nsSMILNullType() {}

    47 };

    49 #endif // NS_SMILNULLTYPE_H_

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