wip plugin installer

QuickLook.Plugin/QuickLook.Plugin.PluginInstaller/Plugin.cs

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+// 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 System.Linq;
+using System.Windows;
+using QuickLook.Common.Plugin;
+
+namespace QuickLook.Plugin.PluginInstaller
+{
+    public class Plugin : IViewer
+    {
+        public int Priority => int.MaxValue;
+
+        public void Init()
+        {
+        }
+
+        public bool CanHandle(string path)
+        {
+            return !Directory.Exists(path) && path.ToLower().EndsWith(".qlviewer");
+        }
+
+        public void Prepare(string path, ContextObject context)
+        {
+            context.PreferredSize = new Size { Width = 400, Height = 172 };
+
+            context.Title = "";
+            context.TitlebarOverlap = false;
+            context.TitlebarBlurVisibility = false;
+            context.TitlebarColourVisibility = false;
+            context.CanResize = false;
+            context.FullWindowDragging = true;
+        }
+
+        public void View(string path, ContextObject context)
+        {
+            context.ViewerContent = new PluginInfoPanel(path);
+
+            context.IsBusy = false;
+        }
+
+        public void Cleanup()
+        {
+        }
+    }
+}