dom/smil/SMILRepeatCount.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef DOM_SMIL_SMILREPEATCOUNT_H_
   8 #define DOM_SMIL_SMILREPEATCOUNT_H_
   9
  10 #include "nsDebug.h"
  11 #include <math.h>
  12
  13 namespace mozilla {
  14
  15 //----------------------------------------------------------------------
  16 // SMILRepeatCount
  17 //
  18 // A tri-state non-negative floating point number for representing the number of
  19 // times an animation repeat, i.e. the SMIL repeatCount attribute.
  20 //
  21 // The three states are:
  22 //  1. not-set
  23 //  2. set (with non-negative, non-zero count value)
  24 //  3. indefinite
  25 //
  26 class SMILRepeatCount {
  27  public:
  28   SMILRepeatCount() : mCount(kNotSet) {}
  29   explicit SMILRepeatCount(double aCount) : mCount(kNotSet) {
  30     SetCount(aCount);
  31   }
  32
  33   operator double() const {
  34     MOZ_ASSERT(IsDefinite(),
  35                "Converting indefinite or unset repeat count to double");
  36     return mCount;
  37   }
  38   bool IsDefinite() const { return mCount != kNotSet && mCount != kIndefinite; }
  39   bool IsIndefinite() const { return mCount == kIndefinite; }
  40   bool IsSet() const { return mCount != kNotSet; }
  41
  42   SMILRepeatCount& operator=(double aCount) {
  43     SetCount(aCount);
  44     return *this;
  45   }
  46   void SetCount(double aCount) {
  47     NS_ASSERTION(aCount > 0.0, "Negative or zero repeat count");
  48     mCount = aCount > 0.0 ? aCount : kNotSet;
  49   }
  50   void SetIndefinite() { mCount = kIndefinite; }
  51   void Unset() { mCount = kNotSet; }
  52
  53  private:
  54   static const double kNotSet;
  55   static const double kIndefinite;
  56
  57   double mCount;
  58 };
  59
  60 }  // namespace mozilla
  61
  62 #endif  // DOM_SMIL_SMILREPEATCOUNT_H_