slideshow/source/inc/shapeattributelayerholder.hxx

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  19
  20 #ifndef INCLUDED_SLIDESHOW_SOURCE_INC_SHAPEATTRIBUTELAYERHOLDER_HXX
  21 #define INCLUDED_SLIDESHOW_SOURCE_INC_SHAPEATTRIBUTELAYERHOLDER_HXX
  22
  23 #include "attributableshape.hxx"
  24 #include "shapeattributelayer.hxx"
  25
  26 #include <boost/noncopyable.hpp>
  27
  28 namespace slideshow
  29 {
  30     namespace internal
  31     {
  32         /** Holds a ShapeAttributeLayer, together with the associated
  33             Shape
  34
  35             Use this class to hold ShapeAttributeLayer objects the
  36             RAII way. When this object gets deleted, it will
  37             automatically revoke the attribute layer for the given
  38             shape (this encapsulates the somewhat clumsy notification
  39             process that is required for shape and attribute layer
  40             interaction).
  41          */
  42         class ShapeAttributeLayerHolder : private boost::noncopyable
  43         {
  44         public:
  45             /** Create a ShapeAttributeLayerHolder instance.
  46
  47                 This constructor creates an empty attribute holder, to
  48                 generate an attribute layer, you have to manually call
  49                 createAttributeLayer().
  50              */
  51             ShapeAttributeLayerHolder() :
  52                 mpShape(),
  53                 mpAttributeLayer()
  54             {
  55             }
  56
  57             ~ShapeAttributeLayerHolder()
  58             {
  59                 reset(); // ensures that the last attribute layer is
  60                          // correctly deregistered from the shape.
  61             }
  62
  63             void reset()
  64             {
  65                 if( mpShape && mpAttributeLayer )
  66                     mpShape->revokeAttributeLayer( mpAttributeLayer );
  67             }
  68
  69             /** This constructor receives a pointer to the Shape, from
  70                 which attribute layers should be generated. Initially,
  71                 this object does not create an attribute layer, you
  72                 have to manually call createAttributeLayer().
  73
  74                 @param rShape
  75                 Shape for which attribute layers should be generated.
  76             */
  77             bool createAttributeLayer( const AttributableShapeSharedPtr& rShape )
  78             {
  79                 reset();
  80
  81                 mpShape = rShape;
  82
  83                 if( mpShape )
  84                     mpAttributeLayer = mpShape->createAttributeLayer();
  85
  86                 return static_cast< bool >(mpAttributeLayer);
  87             }
  88
  89             ShapeAttributeLayerSharedPtr get() const
  90             {
  91                 return mpAttributeLayer;
  92             }
  93
  94         private:
  95             AttributableShapeSharedPtr      mpShape;
  96             ShapeAttributeLayerSharedPtr    mpAttributeLayer;
  97         };
  98
  99     }
 100 }
 101
 102 #endif // INCLUDED_SLIDESHOW_SOURCE_INC_SHAPEATTRIBUTELAYERHOLDER_HXX
 103
 104 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */