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