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27 
28 #ifndef INCLUDED_SLIDESHOW_STRINGANIMATION_HXX
29 #define INCLUDED_SLIDESHOW_STRINGANIMATION_HXX
30 
31 #include "animation.hxx"
32 #include <rtl/ustring.hxx>
33 
34 
35 /* Definition of StringAnimation interface */
36 
37 namespace slideshow
38 {
39     namespace internal
40     {
41         /** Interface defining a string animation.
42 
43         	This interface is a specialization of the Animation
44         	interface, and is used to animate attributes representable
45         	by a discrete character string (e.g. font names)
46          */
47         class StringAnimation : public Animation
48         {
49         public:
50             typedef ::rtl::OUString ValueType;
51 
52             /** Set the animation to value rStr
53 
54                 @param rStr
55                 Current animation value.
56              */
57             virtual bool operator()( const ValueType& rStr ) = 0;
58 
59             /** Request the underlying value for this animation.
60 
61             	This is necessary for pure To or By animations, as the
62             	Activity cannot determine a sensible start value
63             	otherwise.
64 
65                 @attention Note that you are only permitted to query
66                 for the underlying value, if the animation has actually
67                 been started (via start() call).
68              */
69             virtual ValueType getUnderlyingValue() const = 0;
70         };
71 
72         typedef ::boost::shared_ptr< StringAnimation > StringAnimationSharedPtr;
73 
74     }
75 }
76 
77 #endif /* INCLUDED_SLIDESHOW_STRINGANIMATION_HXX */
78