slideshow/source/inc/numberanimation.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
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   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
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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
  29 {
  30     namespace internal
  31     {
  32         /** Interface defining a number animation.
  33
  34             This interface is a specialization of the Animation
  35             interface, and is used to animate attributes representable
  36             by a single floating point value.
  37          */
  38         class NumberAnimation : public Animation
  39         {
  40         public:
  41             typedef double ValueType;
  42
  43             /** Set the animation to value x
  44
  45                 @param x
  46                 Current animation value (must be in an
  47                 attribute-specific permissible range). Overflowing
  48                 values will be clipped to the permissible range
  49                 internally.
  50              */
  51             virtual bool operator()( ValueType x ) = 0;
  52
  53             /** Request the underlying value for this animation.
  54
  55                 This is necessary for pure To or By animations, as the
  56                 Activity cannot determine a sensible start value
  57                 otherwise.
  58
  59                 @attention Note that you are only permitted to query
  60                 for the underlying value, if the animation has actually
  61                 been started (via start() call).
  62              */
  63             virtual ValueType getUnderlyingValue() const = 0;
  64         };
  65
  66         typedef ::std::shared_ptr< NumberAnimation > NumberAnimationSharedPtr;
  67
  68     }
  69 }
  70
  71 #endif // INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX
  72
  73 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */