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#ifndef SD_VIEW_SHELL_FACTORY_HXX
#define SD_VIEW_SHELL_FACTORY_HXX

#include <sal/types.h>
#include <memory>

class Window;

namespace sd {

class FrameView;
class ViewShell;

typedef sal_Int32 ShellId;
// This shell id is a reserved value and does not specify any valid shell.
static const sal_Int32 snInvalidShellId = -1;

template<class ShellType>
class ShellFactory
{
public:
    /** This abstract virtual class needs a destructor so that the
        destructors of derived classes are called.
    */
    virtual ~ShellFactory (void) {};

    /** Create a new instance of a view shell for the given id that will
        be stacked onto the given view shell base.
        @return
            Return the new view shell or NULL when a creation is not
            possible.
        */
    virtual ShellType* CreateShell (
        ShellId nId,
        ::Window* pParentWindow,
        FrameView* pFrameView = NULL) = 0;

    /** Tell the factory that a shell is no longer in use.  It may destroy
        it or put it for future use in a cache.
    */
    virtual void ReleaseShell (ShellType* pShell) = 0;
};

} // end of namespace sd

#endif
