+class InAdvancePagedList(PagedList):
+ def __init__(self, pagefunc, pagecount, pagesize):
+ self._pagefunc = pagefunc
+ self._pagecount = pagecount
+ self._pagesize = pagesize
+
+ def getslice(self, start=0, end=None):
+ res = []
+ start_page = start // self._pagesize
+ end_page = (
+ self._pagecount if end is None else (end // self._pagesize + 1))
+ skip_elems = start - start_page * self._pagesize
+ only_more = None if end is None else end - start
+ for pagenum in range(start_page, end_page):
+ page = list(self._pagefunc(pagenum))
+ if skip_elems:
+ page = page[skip_elems:]
+ skip_elems = None
+ if only_more is not None:
+ if len(page) < only_more:
+ only_more -= len(page)
+ else:
+ page = page[:only_more]
+ res.extend(page)
+ break
+ res.extend(page)
+ return res
+
+