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21 
22 
23 
24 #ifndef _VCLCANVAS_OUTDEVPROVIDER_HXX
25 #define _VCLCANVAS_OUTDEVPROVIDER_HXX
26 
27 #include <sal/types.h>
28 #include <boost/shared_ptr.hpp>
29 
30 
31 class OutputDevice;
32 
33 namespace vclcanvas
34 {
35 	/* Definition of OutDevProvider interface */
36 
37     /** Implementers of this interface provide the CanvasHelper
38         with its OutputDevice.
39 
40         This additional level of indirection was necessary, as the
41         OutputDevice is not an interface. There had to be a mechanism
42         to detect the moment when an OutputDevice is rendered to
43         (e.g. for the BitmapBackBuffer).
44      */
45     class OutDevProvider
46     {
47     public:
~OutDevProvider()48         virtual ~OutDevProvider() {}
49 
50         virtual OutputDevice& 		getOutDev() = 0;
51         virtual const OutputDevice& getOutDev() const = 0;
52     };
53 
54     typedef ::boost::shared_ptr< OutDevProvider > OutDevProviderSharedPtr;
55 }
56 
57 #endif /* _VCLCANVAS_OUTDEVPROVIDER_HXX */
58