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Xamarin.Forms

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Fundamentals

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Document Viewer

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Document Viewer components

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Annotation and collaboration

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Reference

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PDF Processing API

Crop pages dialog

In this document
chevron_rightShow user crop pages dialog
chevron_rightAutomatically crop pages
chevron_rightRemove user defined crop boxes
chevron_rightPermanently crop pages
This tutorial only applies to Xamarin.Android.

With the PDFTron library you can crop pages manually or automatically, as well as reset document pages to their original size. The UserCropDialogFragment allows a user to adjust the page's crop box which can then be applied to a subset of pages or to all the pages in a document.

linkShow user crop pages dialog

To show a user crop pages dialog in your activity, create a new instance of UserCropDialogFragment by calling newInstance() and setting the PDFViewCtrl:

In order to view user cropped pages in PDFViewCtrl make sure you set Page.e_user_crop as the default page box: