/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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 nsSMILRepeatCount_h

#define nsSMILRepeatCount_h

#include "nsDebug.h"

#include <math.h>

//----------------------------------------------------------------------

// nsSMILRepeatCount

//

// A tri-state non-negative floating point number for representing the number of

// times an animation repeat, i.e. the SMIL repeatCount attribute.

//

// The three states are:

//  1. not-set

//  2. set (with non-negative, non-zero count value)

//  3. indefinite

//

class nsSMILRepeatCount

{

public:

  nsSMILRepeatCount() : mCount(kNotSet) {}

  explicit nsSMILRepeatCount(double aCount)

    : mCount(kNotSet) { SetCount(aCount); }

  operator double() const {

    MOZ_ASSERT(IsDefinite(),

      "Converting indefinite or unset repeat count to double");

    return mCount;

  }

  bool IsDefinite() const {

    return mCount != kNotSet && mCount != kIndefinite;

  }

  bool IsIndefinite() const { return mCount == kIndefinite; }

  bool IsSet() const { return mCount != kNotSet; }

  nsSMILRepeatCount& operator=(double aCount)

  {

    SetCount(aCount);

    return *this;

  }

  void SetCount(double aCount)

  {

    NS_ASSERTION(aCount > 0.0, "Negative or zero repeat count");

    mCount = aCount > 0.0 ? aCount : kNotSet;

  }

  void SetIndefinite() { mCount = kIndefinite; }

  void Unset() { mCount = kNotSet; }

private:

  static const double kNotSet;

  static const double kIndefinite;

  double  mCount;

};

#endif