packages/MaterialDesignThemes.2.5.1/src/net45/SnackbarMessageQueue.cs

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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using System.Windows.Threading;

namespace MaterialDesignThemes.Wpf
{
    public class SnackbarMessageQueue : ISnackbarMessageQueue, IDisposable
    {
        private readonly TimeSpan _messageDuration;
        private readonly HashSet<Snackbar> _pairedSnackbars = new HashSet<Snackbar>();
        private readonly LinkedList<SnackbarMessageQueueItem> _snackbarMessages = new LinkedList<SnackbarMessageQueueItem>();
        private readonly ManualResetEvent _disposedEvent = new ManualResetEvent(false);
        private readonly ManualResetEvent _pausedEvent = new ManualResetEvent(false);
        private readonly ManualResetEvent _messageWaitingEvent = new ManualResetEvent(false);
        private Tuple<SnackbarMessageQueueItem, DateTime> _latestShownItem;
        private int _pauseCounter;
        private bool _isDisposed;

        #region private class MouseNotOverManagedWaitHandle : IDisposable

        private class MouseNotOverManagedWaitHandle : IDisposable
        {
            private readonly ManualResetEvent _waitHandle;
            private readonly ManualResetEvent _disposedWaitHandle = new ManualResetEvent(false);
            private Action _cleanUp;
            private bool _isWaitHandleDisposed;
            private readonly object _waitHandleGate = new object();

            public MouseNotOverManagedWaitHandle(UIElement uiElement)
            {
                if (uiElement == null) throw new ArgumentNullException(nameof(uiElement));

                _waitHandle = new ManualResetEvent(!uiElement.IsMouseOver);
                uiElement.MouseEnter += UiElementOnMouseEnter;
                uiElement.MouseLeave += UiElementOnMouseLeave;

                _cleanUp = () =>
                {
                    uiElement.MouseEnter -= UiElementOnMouseEnter;
                    uiElement.MouseLeave -= UiElementOnMouseLeave;
                    lock (_waitHandleGate)
                    {
                        _waitHandle.Dispose();
                        _isWaitHandleDisposed = true;
                    }
                    _disposedWaitHandle.Set();
                    _disposedWaitHandle.Dispose();
                    _cleanUp = () => { };
                };
            }

            public WaitHandle WaitHandle => _waitHandle;

            private void UiElementOnMouseLeave(object sender, MouseEventArgs mouseEventArgs)