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79 lines
3.2 KiB
C++
79 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SMIL module.
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*
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* The Initial Developer of the Original Code is Brian Birtles.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <roc+moz@cs.cmu.edu>
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* Brian Birtles <birtles@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef NS_SMILNULLTYPE_H_
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#define NS_SMILNULLTYPE_H_
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#include "nsISMILType.h"
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class nsSMILNullType : public nsISMILType
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{
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public:
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// Singleton for nsSMILValue objects to hold onto.
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static nsSMILNullType sSingleton;
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protected:
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// nsISMILType Methods
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// -------------------
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virtual void Init(nsSMILValue& aValue) const {}
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virtual void Destroy(nsSMILValue& aValue) const {}
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virtual nsresult Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const;
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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 PRBool IsEqual(const nsSMILValue& aLeft,
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const nsSMILValue& aRight) const;
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virtual nsresult Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
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PRUint32 aCount) const;
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virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
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const nsSMILValue& aTo,
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double& aDistance) const;
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virtual nsresult Interpolate(const nsSMILValue& aStartVal,
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const nsSMILValue& aEndVal,
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double aUnitDistance,
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nsSMILValue& aResult) const;
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private:
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// Private constructor & destructor: prevent instances beyond my singleton,
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// and prevent others from deleting my singleton.
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nsSMILNullType() {}
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~nsSMILNullType() {}
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};
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#endif // NS_SMILNULLTYPE_H_
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