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