PDF file annotations (un-flattened) do not show

[SevoMan]

When a PDF document is edited in another program (Adobe/Foxit/Edge), with annotations, text boxes, shapes, etc.. and saved... QuickLook will not show the annotations and instead shows the pre-annotation original file.

Then only time QuickLook will show these annotations is if the file is 'flattened'/made permanent. Windows thumbnails/explorer preview (and also the original Mac QuickLook) all show these unsaved annotations and so should QuickLook. Please fix. Excellent program otherwise.

[xupefei]

The underlying PdfiumViewer does not support showing annotations. I don't know why but have no time to research into it ...

Any comment is appreciated.

[rabelux]

@xupefei I tried digging into this issue and stumbled upon a few things.
First possible solution from stackoverflow is using following code snippet:

doc = PDDocument.load(FilePath);
PDPage page = (PDPage)doc.getDocumentCatalog().getAllPages().get(pageNum);
int rotPD = page.findRotation();
PDRectangle pageBound = page.findCropBox();
PDRectangle rect = ModifyRectAccordingToRotation(rectangle, rotPD, pageBound);
PDAnnotationLink txtLink = new PDAnnotationLink();
    PDBorderStyleDictionary borderULine = new PDBorderStyleDictionary();
                    borderULine.setStyle(PDBorderStyleDictionary.STYLE_UNDERLINE);
borderULine.setWidth(0);
txtLink.setBorderStyle(borderULine);
PDActionRemoteGoTo remoteGoto = new PDActionRemoteGoTo();
PDComplexFileSpecification fileDesc = new PDComplexFileSpecification();
fileDesc.setFile(System.IO.Path.GetFileName(path));
remoteGoto.setOpenInNewWindow(true);
remoteGoto.setFile(fileDesc);
txtLink.setAction(remoteGoto);
txtLink.setRectangle(rect);
page.getAnnotations().add(txtLink);

Second approach is using the FPDF_ANNOT flag. The render()-function can take this flag as an input (found in PdfiumViewer/PdfiumViewer/PdfDocument.cs but you're using a different overload of this function PdfDocumentWrapper.Render(CurrentPage, factor) that I couldn't find in the library, so I don't where your functions comes from and whether it can handle this flag. Hope this helps.

[mooflu]

The code passes an annotation flag here: https://github.com/QL-Win/QuickLook/blob/master/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfPageExtension.cs#L65

It's just that PdfiumViewer hasn't been updated in a while and the original author has stopped working on it. When I try https://github.com/frankhommers/PdfiumViewer and a more recent pdfium dll from here https://github.com/bblanchon/pdfium-binaries annotations show up.