content/smil/nsSMILNullType.h
author Chris Leary <cdleary@mozilla.com>
Sun, 11 Jul 2010 00:57:13 -0700
changeset 53091 90da6c5c9cbbfc735159314a7033723b46b825a2
parent 39715 de234fec8da7ec980f38a755dfde520ba0d101d6
child 77799 e7854b4d29ba905ae3994f821b160c989bac4260
permissions -rw-r--r--
Bug 577708: Remove Algol-like display optimization. (r=dvander)

/* -*- 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
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** 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_