michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsSMILRepeatCount_h
michael@0: #define nsSMILRepeatCount_h
michael@0: 
michael@0: #include "nsDebug.h"
michael@0: #include <math.h>
michael@0: 
michael@0: //----------------------------------------------------------------------
michael@0: // nsSMILRepeatCount
michael@0: //
michael@0: // A tri-state non-negative floating point number for representing the number of
michael@0: // times an animation repeat, i.e. the SMIL repeatCount attribute.
michael@0: //
michael@0: // The three states are:
michael@0: //  1. not-set
michael@0: //  2. set (with non-negative, non-zero count value)
michael@0: //  3. indefinite
michael@0: //
michael@0: class nsSMILRepeatCount
michael@0: {
michael@0: public:
michael@0:   nsSMILRepeatCount() : mCount(kNotSet) {}
michael@0:   explicit nsSMILRepeatCount(double aCount)
michael@0:     : mCount(kNotSet) { SetCount(aCount); }
michael@0: 
michael@0:   operator double() const {
michael@0:     MOZ_ASSERT(IsDefinite(),
michael@0:       "Converting indefinite or unset repeat count to double");
michael@0:     return mCount;
michael@0:   }
michael@0:   bool IsDefinite() const {
michael@0:     return mCount != kNotSet && mCount != kIndefinite;
michael@0:   }
michael@0:   bool IsIndefinite() const { return mCount == kIndefinite; }
michael@0:   bool IsSet() const { return mCount != kNotSet; }
michael@0: 
michael@0:   nsSMILRepeatCount& operator=(double aCount)
michael@0:   {
michael@0:     SetCount(aCount);
michael@0:     return *this;
michael@0:   }
michael@0:   void SetCount(double aCount)
michael@0:   {
michael@0:     NS_ASSERTION(aCount > 0.0, "Negative or zero repeat count");
michael@0:     mCount = aCount > 0.0 ? aCount : kNotSet;
michael@0:   }
michael@0:   void SetIndefinite() { mCount = kIndefinite; }
michael@0:   void Unset() { mCount = kNotSet; }
michael@0: 
michael@0: private:
michael@0:   static const double kNotSet;
michael@0:   static const double kIndefinite;
michael@0: 
michael@0:   double  mCount;
michael@0: };
michael@0: 
michael@0: #endif