Merge OfficeViewer-Native plugin #1662

Repo URL: https://github.com/QL-Win/QuickLook.Plugin.OfficeViewer-Native

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/PreviewPanel.cs

@@ -0,0 +1,59 @@
+// 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.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Forms.Integration;
+
+namespace QuickLook.Plugin.OfficeViewer;
+
+public class PreviewPanel : WindowsFormsHost, IDisposable
+{
+    private PreviewHandlerHost _control;
+
+    public new void Dispose()
+    {
+        Application.Current.Dispatcher.BeginInvoke(new Action(() =>
+        {
+            Child = null;
+            _control?.Dispose();
+            _control = null;
+
+            base.Dispose();
+        }));
+    }
+
+    public void PreviewFile(string file, ContextObject context)
+    {
+        _control = new PreviewHandlerHost();
+        Child = _control;
+        _control.Open(file);
+
+        //SetForegroundWindow(new WindowInteropHelper(context.ViewerWindow).Handle);
+        //SetActiveWindow(presenter.Handle);
+    }
+
+    [DllImport("user32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool SetForegroundWindow(IntPtr hWnd);
+
+    [DllImport("user32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool SetActiveWindow(IntPtr hWnd);
+}