In the WPF version of the Pdf Viewer, there was VerticalScrollOffset and ScrollToVerticalOffset(). I'm not seeing those in the .Net MAUI version of the pdf viewer. I've been trying to use the ScrollIntoView, but I'm finding it difficult to figure out the correct location.
I'm wanting to capture the current scroll location, and then once I reload the pdf, scroll back to that location.
1 Answer, 1 is accepted
Hello Nathan,
You can use the ScrollIntoView method and Viewport property of the PDF Viewer. Here is the approach:
private static Rect GetViewport(RadPdfViewer pdfViewer)
{
var presenterPI = pdfViewer.GetType().GetProperty("Presenter", BindingFlags.NonPublic | BindingFlags.Instance);
object presenter = presenterPI.GetValue(pdfViewer);
var viewportPI = presenter.GetType().GetProperty("Viewport", BindingFlags.NonPublic | BindingFlags.Instance);
object radRect = viewportPI.GetValue(presenter);
var xFI = radRect.GetType().GetField("X");
var yFI = radRect.GetType().GetField("Y");
var rightPI = radRect.GetType().GetProperty("Right", BindingFlags.NonPublic | BindingFlags.Instance);
var bottomPI = radRect.GetType().GetProperty("Bottom", BindingFlags.NonPublic | BindingFlags.Instance);
double x = (double)xFI.GetValue(radRect);
double y = (double)yFI.GetValue(radRect);
double width = (double)rightPI.GetValue(radRect) - x;
double height = (double)bottomPI.GetValue(radRect) - y;
return new Rect(x, y, width, height);
}Rect viewport = GetViewport(this.pdfViewer);
Rect rect = new Rect(viewport.X, viewport.Y + 200, viewport.Width, viewport.Height);
this.pdfViewer.ScrollIntoView(rect);Regards,
Didi
Progress Telerik
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I'm getting an error when I try to access the Presenter on the pdfViewer. When in debug mode, I can see that it exists, but it won't compile when I try to use it.
I have updated the code for the GetViewport method. You have to get the Presenter property through reflection.
In general, the Viewport functionality will be available from the next release expected in the middle of November 2023, so you won't need to use the workaround suggested here.
Rank 1
Ok, getting the presenter through reflection worked. I'll look forward to the next release as well.
thanks