MARKUS

using System;

using System.Collections.Generic;

using System.Text;

using System.Threading;

using System.Windows;

namespace NetSparkleUpdater.UI.WPF.Controls

{

    /// <summary>

    /// Base <see cref="Window"/> class for most WPF update windows.

    /// Provides utilities and common code for windows that are shown.

    /// </summary>

    public class BaseWindow : Window

    {

        /// <summary>

        /// Whether or not this Window is on the main thread or not

        /// </summary>

        protected bool _isOnMainThread;

        /// <summary>

        /// Whether or not the close window code has been called yet

        /// (so that it is not called more than one time).

        /// </summary>

        protected bool _hasInitiatedShutdown = false;

        /// <summary>

        /// Public, default construtor for BaseWindow objects

        /// </summary>

        public BaseWindow()

        {

        }

        /// <summary>

        /// Create a BaseWindow and set up the closing event handler

        /// if requested

        /// </summary>

        /// <param name="useClosingEvent">true to use the <see cref="Window.Closing"/>

        /// event handler; false otherwise</param>

        public BaseWindow(bool useClosingEvent)

        {

            if (useClosingEvent)

            {

                Closing += BaseWindow_Closing;

            }

        }

        private void BaseWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)

        {

            Closing -= BaseWindow_Closing;

            if (!_isOnMainThread && !_hasInitiatedShutdown)

            {

                _hasInitiatedShutdown = true;

                Dispatcher.InvokeShutdown();

            }

        }

        /// <summary>

        /// Show this window to the user.

        /// </summary>

        /// <param name="isOnMainThread">true if the window is being shown while

        /// on the main thread; false otherwise</param>

        protected void ShowWindow(bool isOnMainThread)

        {

            try

            {

                Show();

                _isOnMainThread = isOnMainThread;

                if (!isOnMainThread)

                {

                    // https://stackoverflow.com/questions/1111369/how-do-i-create-and-show-wpf-windows-on-separate-threads

                    System.Windows.Threading.Dispatcher.Run();

                }

            }

            catch (ThreadAbortException)

            {

                Close();

                if (!isOnMainThread)

                {

                    Dispatcher.InvokeShutdown();

                }

            }

        }

        /// <summary>

        /// Close the window and shut down the UI dispatcher if necessary

        /// </summary>

        protected void CloseWindow()

        {

            // make sure to close the window on the thread it has been started on

            Dispatcher.InvokeAsync(() =>

            {

                Close();

                if (!_isOnMainThread && !_hasInitiatedShutdown)

                {

                    _hasInitiatedShutdown = true;

                    Dispatcher.InvokeShutdown();

                }

            });

        }

        /// <summary>

        /// Bring this window to the front of all other windows by temporarily

        /// setting Topmost to true.

        /// </summary>

        protected void BringToFront()

        {

            Topmost = true;

            Activate();

            Topmost = false;

        }

    }

}