slideshow/source/inc/numberanimation.hxx

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  19
  20 #ifndef INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX
  21 #define INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX
  22
  23 #include "animation.hxx"
  24
  25
  26 /* Definition of NumberAnimation interface */
  27
  28 namespace slideshow::internal
  29     {
  30         /** Interface defining a number animation.
  31
  32             This interface is a specialization of the Animation
  33             interface, and is used to animate attributes representable
  34             by a single floating point value.
  35          */
  36         class NumberAnimation : public Animation
  37         {
  38         public:
  39             typedef double ValueType;
  40
  41             /** Set the animation to value x
  42
  43                 @param x
  44                 Current animation value (must be in an
  45                 attribute-specific permissible range). Overflowing
  46                 values will be clipped to the permissible range
  47                 internally.
  48              */
  49             virtual bool operator()( double x ) = 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 double getUnderlyingValue() const = 0;
  62         };
  63
  64         typedef ::std::shared_ptr< NumberAnimation > NumberAnimationSharedPtr;
  65
  66 }
  67
  68 #endif // INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX
  69
  70 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */