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