QuickLook/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfDocumentWrapper.cs

// Copyright © 2018 Paddy Xu
// 
// This file is part of QuickLook program.
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.IO;
using PdfiumViewer;

namespace QuickLook.Plugin.PDFViewer
{
    public class PdfDocumentWrapper : IDisposable
    {
        public PdfDocumentWrapper(Stream stream)
        {
            PdfStream = new MemoryStream((int) stream.Length);
            stream.CopyTo(PdfStream);

            PdfDocument = PdfDocument.Load(PdfStream);
        }

        public PdfDocument PdfDocument { get; private set; }

        public MemoryStream PdfStream { get; private set; }

        public void Dispose()
        {
            PdfDocument.Dispose();
            PdfDocument = null;
            PdfStream.Dispose();
            PdfStream = null;
        }

        public void Refresh()
        {
            var oldD = PdfDocument;

            PdfStream.Position = 0;
            var newObj = new PdfDocumentWrapper(PdfStream);
            PdfDocument = newObj.PdfDocument;
            PdfStream = newObj.PdfStream;

            oldD.Dispose();
        }
    }
}