gecko/content/smil/nsSMILNullType.h

79 lines
3.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <roc+moz@cs.cmu.edu>
* Brian Birtles <birtles@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#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 PRBool IsEqual(const nsSMILValue& aLeft,
const nsSMILValue& aRight) const;
virtual nsresult Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
PRUint32 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_