pdfPage method
Implementation
Future<UPdfPage?> pdfPage(int index) async {
final UPdfPage? cached = _pages[index];
if (cached != null) return cached;
final UPdfDocument? document = _document;
if (document == null) return null;
final UPdfPage? page = await document.page(index);
if (page == null) return null;
if (_pages.length > 512) _pages.clear();
_pages[index] = page;
_infos[index] = _infoFor(page);
return page;
}