Add built-in ThumbnailViewer plugin

QuickLook.Plugin/QuickLook.Plugin.ThumbnailViewer/Plugin.cs

@@ -0,0 +1,98 @@
+// Copyright © 2017-2025 QL-Win Contributors
+//
+// 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 QuickLook.Common.Plugin;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Media.Imaging;
+
+namespace QuickLook.Plugin.ThumbnailViewer;
+
+public class Plugin : IViewer
+{
+    private static readonly HashSet<string> WellKnownImageExtensions = new(
+    [
+        ".xd", // AdobeXD
+        //".xmind", // XMind
+        //".fig", // Figma
+    ]);
+
+    private ThumbnailImagePanel _ip;
+
+    public int Priority => 0;
+
+    public void Init()
+    {
+    }
+
+    public bool CanHandle(string path)
+    {
+        return !Directory.Exists(path) && WellKnownImageExtensions.Contains(Path.GetExtension(path.ToLower()));
+    }
+
+    public void Prepare(string path, ContextObject context)
+    {
+        try
+        {
+            using Stream imageData = ProductExtractor.ViewImage(path);
+            BitmapImage bitmap = imageData.ReadAsBitmapImage();
+            context.SetPreferredSizeFit(new Size(bitmap.PixelWidth, bitmap.PixelHeight), 0.8d);
+        }
+        catch (Exception e)
+        {
+            _ = e;
+            context.PreferredSize = new Size { Width = 1200, Height = 900 };
+        }
+    }
+
+    public void View(string path, ContextObject context)
+    {
+        _ip = new ThumbnailImagePanel
+        {
+            ContextObject = context,
+        };
+
+        _ = Task.Run(() =>
+        {
+            using Stream imageData = ProductExtractor.ViewImage(path);
+            BitmapImage bitmap = imageData.ReadAsBitmapImage();
+
+            if (_ip is null) return;
+
+            _ip.Dispatcher.Invoke(() =>
+            {
+                _ip.Source = bitmap;
+                _ip.DoZoomToFit();
+            });
+            context.IsBusy = false;
+            context.Title = $"{bitmap.PixelWidth}x{bitmap.PixelHeight}: {Path.GetFileName(path)}";
+        });
+
+        context.ViewerContent = _ip;
+        context.Title = $"{Path.GetFileName(path)}";
+    }
+
+    public void Cleanup()
+    {
+        GC.SuppressFinalize(this);
+
+        _ip = null;
+    }
+}