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Realtime collaboration server

A server can be setup to be the backend that hosts all your files and annotations to use realtime collaboration with PDFTron SDK.

Realtime collaboration basics

This tutorial only applies to Xamarin.Android.

linkHost annotations in your own server

In realtime collaboration, a server will merely act as an online database that triggers events upon data creation/modification/deletion. As long as the above requirement is met, your server can be built in any language and stack of your choice. PDFTron provides an interface that will allow you to connect your data to the out-of-box UI.

  1. Your will need to obtain a reference to CollabManager from the CollabViewerTabHostFragment, then setup the current collaboration session, for example:

    void HandleTabDocumentLoaded(String tag)
    {
        // setup the current collaboration session
        var collabManager = mPdfViewCtrlTabHostFragment.CollabManager;
        if (collabManager != null)
        {
            collabManager.SetCurrentUser(mUserId, mUserName);
            collabManager.SetCurrentDocument(mDocumentId);
            collabManager.SendAnnotationEvent += (sender, e) =>
            {
                // local change, send info to server here
            };
        }
    }
  2. When your server notifies the client about remote changes, import the XFDF command string with CollabManager:

    void ImportXfdf(String xfdfCommand) {
        var collabManager = mCollabViewerTabHostFragment.CollabManager;
        collabManager.ImportAnnotationCommand(xfdfCommand);
    }

The annotations appearing on the document in real time are managed through a separate XFDF format, while the original version of the document is preserved on the server. Note that the client downloads the original untouched document at the start of the collaboration session.

And that is it! PDFTron will handle all annotation syncing and annotation reply for you.

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