gecko/content/smil/nsSMILNullType.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef NS_SMILNULLTYPE_H_
#define NS_SMILNULLTYPE_H_
#include "nsISMILType.h"
class nsSMILNullType : public nsISMILType
{
public:
// Singleton for nsSMILValue objects to hold onto.
static nsSMILNullType sSingleton;
protected:
// nsISMILType Methods
// -------------------
virtual void Init(nsSMILValue& aValue) const {}
virtual void Destroy(nsSMILValue& aValue) const {}
virtual nsresult Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const;
// The remaining methods should never be called, so although they're very
// simple they don't need to be inline.
virtual bool IsEqual(const nsSMILValue& aLeft,
const nsSMILValue& aRight) const;
virtual nsresult Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
uint32_t aCount) const;
virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
const nsSMILValue& aTo,
double& aDistance) const;
virtual nsresult Interpolate(const nsSMILValue& aStartVal,
const nsSMILValue& aEndVal,
double aUnitDistance,
nsSMILValue& aResult) const;
private:
// Private constructor & destructor: prevent instances beyond my singleton,
// and prevent others from deleting my singleton.
nsSMILNullType() {}
~nsSMILNullType() {}
};
#endif // NS_SMILNULLTYPE_H_