Added EPUB plugin

QuickLook.Plugin/QuickLook.Plugin.EpubViewer/Plugin.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.ExceptionServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Threading;
+using QuickLook.Common.Plugin;
+using QuickLook.Plugin.HtmlViewer;
+using VersOne.Epub;
+
+namespace QuickLook.Plugin.EpubViewer
+{
+    public class Plugin : IViewer
+    {
+        private EpubViewerControl _panel;
+        public int Priority => int.MaxValue;
+
+        public void Init()
+        {
+        }
+
+        public bool CanHandle(string path)
+        {
+            return !Directory.Exists(path) && new[] { ".epub" }.Any(path.ToLower().EndsWith);
+        }
+
+        public void Cleanup()
+        {
+        }
+
+        public void Prepare(string path, ContextObject context)
+        {
+            context.PreferredSize = new Size { Width = 1000, Height = 600 };
+        }
+
+        public void View(string path, ContextObject context)
+        {
+            _panel = new EpubViewerControl();
+            context.ViewerContent = _panel;
+            Exception exception = null;
+
+            _panel.Dispatcher.BeginInvoke(new Action(() =>
+            {
+                try
+                {
+                    // Opens a book
+                    EpubBookRef epubBook = EpubReader.OpenBook(path);
+                    context.Title = epubBook.Title;
+                    _panel.SetContent(epubBook);
+
+                    context.IsBusy = false;
+                }
+                catch (Exception e)
+                {
+                    exception = e;
+                }
+            }), DispatcherPriority.Loaded).Wait();
+
+            if (exception != null)
+                ExceptionDispatchInfo.Capture(exception).Throw();
+        }
+    }
+}