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I have to listen AnnotationModified event as shown below. But not sure on how/when because CurentPdfViewCtrlFragment is null.

Am using pdftron.PDF.Controls.DocumentView2 as given in this sample https://github.com/PDFTron/xamarin-forms-sample

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Balaji Gunasekaran
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2 Answers2

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You should override the OnTabDocumentLoadedEvent to ensure that the fragment is not null

https://www.pdftron.com/api/xamarinandroid/tools/api/pdftron.PDF.Controls.DocumentView2.html#pdftron_PDF_Controls_DocumentView2_OnTabDocumentLoaded_System_String_

Andrew
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I have to use MPdfViewCtrlTabHostFragment.CurrentPdfViewCtrlFragment not base.Viewer.CurrentPdfViewCtrlFragment

Following code change works fine

mDocumentView.MPdfViewCtrlTabHostFragment.CurrentPdfViewCtrlFragment.ToolManager.AnnotationsModified += ToolManager_AnnotationsModified
Balaji Gunasekaran
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  • As Andrew pointed out I have actually subscribed to TabDocumentLoaded event and using that I have subscribed to AnnotationModifed event as shown above. – Balaji Gunasekaran Jul 26 '21 at 12:01