slideshow/source/inc/numberanimation.hxx

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  30
  31 #ifndef INCLUDED_SLIDESHOW_NUMBERANIMATION_HXX
  32 #define INCLUDED_SLIDESHOW_NUMBERANIMATION_HXX
  33
  34 #include <animation.hxx>
  35
  36
  37 /* Definition of NumberAnimation interface */
  38
  39 namespace slideshow
  40 {
  41     namespace internal
  42     {
  43         /** Interface defining a number animation.
  44
  45             This interface is a specialization of the Animation
  46             interface, and is used to animate attributes representable
  47             by a single floating point value.
  48          */
  49         class NumberAnimation : public Animation
  50         {
  51         public:
  52             typedef double ValueType;
  53
  54             /** Set the animation to value x
  55
  56                 @param x
  57                 Current animation value (must be in an
  58                 attribute-specific permissible range). Overflowing
  59                 values will be clipped to the permissible range
  60                 internally.
  61              */
  62             virtual bool operator()( ValueType x ) = 0;
  63
  64             /** Request the underlying value for this animation.
  65
  66                 This is necessary for pure To or By animations, as the
  67                 Activity cannot determine a sensible start value
  68                 otherwise.
  69
  70                 @attention Note that you are only permitted to query
  71                 for the underlying value, if the animation has actually
  72                 been started (via start() call).
  73              */
  74             virtual ValueType getUnderlyingValue() const = 0;
  75         };
  76
  77         typedef ::boost::shared_ptr< NumberAnimation > NumberAnimationSharedPtr;
  78
  79     }
  80 }
  81
  82 #endif /* INCLUDED_SLIDESHOW_NUMBERANIMATION_HXX */