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using Gdk;

public abstract class ImportBackend {
      // Prepare for importing; returns the number of pictures available.
      // If it returns zero, you should not call Step(), Cancel() or Finish() until you call Prepare() again.
      public abstract int Prepare ();

      // Import one picture.  Returns false when done; then you have to call Finish().
      public abstract bool Step (out Photo photo, out Pixbuf thumbnail, out int count);

      // Cancel importing.
      public abstract void Cancel ();

      // Complete importing (needs to be called).
      public abstract void Finish ();

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