PreviewPanel.cs

// Copyright © 2017 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.Runtime.InteropServices;
using System.Windows;
using System.Windows.Forms.Integration;
using QuickLook.Common.Plugin;

namespace QuickLook.Plugin.OfficeViewer
{
    /// <summary>
    ///     Interaction logic for PreviewPanel.xaml
    /// </summary>
    public class PreviewPanel : WindowsFormsHost, IDisposable
    {
        private PreviewHandlerHost _control;

        public 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);
    }
}