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#ifndef INCLUDED_SD_SOURCE_UI_SLIDESORTER_INC_CACHE_SLSPAGECACHE_HXX
#define INCLUDED_SD_SOURCE_UI_SLIDESORTER_INC_CACHE_SLSPAGECACHE_HXX
#include "cache/SlsCacheContext.hxx"
#include Bitmaps for previews and a cache are used to speed up the display
(painting) of the slide sorter. But, of course, we have to limit this
time-space-tradeoff by limiting the amount of space that can be use to
store bitmaps. There are several strategies employed by this class to shorten the
perceived time that is used to paint the slide sorter:
There is another somewhat similar methods for requesting new previews: GetPreviewBitmap() schedules a re-rendering (when necessary) and returns the preview what is currently available, either as a preview of the preview or, when nothing has changed since the last call, as the final thing.
*/ class PageCache { public: /** The page chache is created with a reference to the slide sorter so that it has access to both the view and the model and so can fill itself with requests for all or just the visible pages. It is the task of the PageCacheManager to create new objects of this class. */ PageCache ( const Size& rPreviewSize, const bool bDoSuperSampling, const SharedCacheContext& rpCacheContext); ~PageCache(); void ChangeSize( const Size& rPreviewSize, const bool bDoSuperSampling); /** Request a preview bitmap for the specified page object in the specified size. The returned bitmap may be a preview of the preview, i.e. either a scaled (up or down) version of a previous preview (of the wrong size) or an empty bitmap. In this case a request for the generation of a new preview is created and inserted into the request queue. When the preview is available in the right size the page shape will be told to paint itself again. When it then calls this method again if receives the correctly sized preview bitmap. @param rRequestData This data is used to determine the preview. @param bResize When