Add built-in HelixViewer for 3d models

QuickLook.Plugin/QuickLook.Plugin.HelixViewer/Handler.cs

@@ -0,0 +1,53 @@
+// 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.IO;
+using System.Linq;
+
+namespace QuickLook.Plugin.HelixViewer;
+
+internal static class Handler
+{
+    public static bool CanHandle(string path)
+    {
+        var ext = Path.GetExtension(path).ToLower();
+
+        if (ext == ".obj")
+        {
+            var firstLines = File.ReadLines(path).Take(10);
+            foreach (var line in firstLines)
+            {
+                if (line.StartsWith("#") || line.StartsWith("v ") || line.StartsWith("f ") || line.StartsWith("o ") ||
+                    line.StartsWith("vn ") || line.StartsWith("vt ") || line.StartsWith("mtllib"))
+                {
+                    return true;
+                }
+            }
+        }
+        else
+        {
+            return true; // Assume other formats are supported
+        }
+
+        return false;
+    }
+
+    public static void Prepare(string path, ContextObject context)
+    {
+    }
+}