slideshow/source/inc/boolanimation.hxx

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  19
  20 #ifndef INCLUDED_SLIDESHOW_SOURCE_INC_BOOLANIMATION_HXX
  21 #define INCLUDED_SLIDESHOW_SOURCE_INC_BOOLANIMATION_HXX
  22
  23 #include "animation.hxx"
  24
  25
  26 /* Definition of BoolAnimation interface */
  27
  28 namespace slideshow
  29 {
  30     namespace internal
  31     {
  32         /** Interface defining a bool animation.
  33
  34             This interface is a specialization of the Animation
  35             interface, and is used to animate attributes that have
  36             only two discrete values (on and off, or true and false,
  37             for example).
  38          */
  39         class BoolAnimation : public Animation
  40         {
  41         public:
  42             typedef bool ValueType;
  43
  44             /** Set the animation to the given value
  45
  46                 @param bValue
  47                 Current animation value.
  48              */
  49             virtual bool operator()( ValueType bValue ) = 0;
  50
  51             /** Request the underlying value for this animation.
  52
  53                 This is necessary for pure To or By animations, as the
  54                 Activity cannot determine a sensible start value
  55                 otherwise.
  56
  57                 @attention Note that you are only permitted to query
  58                 for the underlying value, if the animation has actually
  59                 been started (via start() call).
  60              */
  61             virtual ValueType getUnderlyingValue() const = 0;
  62         };
  63
  64         typedef ::boost::shared_ptr< BoolAnimation > BoolAnimationSharedPtr;
  65
  66     }
  67 }
  68
  69 #endif // INCLUDED_SLIDESHOW_SOURCE_INC_BOOLANIMATION_HXX
  70
  71 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */