start working on NConvert

QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WebpagePanel.cs

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+// Copyright © 2017 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 System.Text;
+using System.Windows.Controls;
+using System.Windows.Threading;
+using QuickLook.Common.Helpers;
+
+namespace QuickLook.Plugin.HtmlViewer
+{
+    public class WebpagePanel : WpfWebBrowserWrapper
+    {
+        public WebpagePanel()
+        {
+            Zoom = (int) (100 * DpiHelper.GetCurrentScaleFactor().Vertical);
+        }
+
+        public void LoadFile(string path)
+        {
+            if (Path.IsPathRooted(path))
+                path = Helper.FilePathToFileUrl(path);
+
+            Dispatcher.Invoke(() => { base.Navigate(path); }, DispatcherPriority.Loaded);
+        }
+
+        public void LoadHtml(string html)
+        {
+            var s = new MemoryStream(Encoding.UTF8.GetBytes(html ?? ""));
+
+            Dispatcher.Invoke(() => { base.Navigate(s); }, DispatcherPriority.Loaded);
+        }
+    }
+}