зеркало из https://github.com/mozilla/gecko-dev.git
48 строки
1.7 KiB
C++
48 строки
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_SMILNullType_h
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#define mozilla_SMILNullType_h
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#include "mozilla/Attributes.h"
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#include "mozilla/SMILType.h"
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namespace mozilla {
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class SMILNullType : public SMILType {
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public:
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// Singleton for SMILValue objects to hold onto.
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static SMILNullType* Singleton();
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protected:
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// SMILType Methods
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// -------------------
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virtual void Init(SMILValue& aValue) const override {}
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virtual void Destroy(SMILValue& aValue) const override {}
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virtual nsresult Assign(SMILValue& aDest,
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const SMILValue& aSrc) const override;
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// The remaining methods should never be called, so although they're very
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// simple they don't need to be inline.
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virtual bool IsEqual(const SMILValue& aLeft,
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const SMILValue& aRight) const override;
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virtual nsresult Add(SMILValue& aDest, const SMILValue& aValueToAdd,
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uint32_t aCount) const override;
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virtual nsresult ComputeDistance(const SMILValue& aFrom, const SMILValue& aTo,
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double& aDistance) const override;
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virtual nsresult Interpolate(const SMILValue& aStartVal,
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const SMILValue& aEndVal, double aUnitDistance,
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SMILValue& aResult) const override;
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private:
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// Private constructor: prevent instances beyond my singleton.
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constexpr SMILNullType() = default;
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};
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} // namespace mozilla
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#endif // mozilla_SMILNullType_h
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