Bring Hangover Chardonnay into feature parity with Classic (#409)

Source/HangoverAvalonia/Controls/CheckedListBox.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+			 mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="HangoverAvalonia.Controls.CheckedListBox">
+	
+	<UserControl.Resources>
+		<RecyclePool x:Key="RecyclePool" />
+		<DataTemplate x:Key="queuedBook">
+			<CheckBox Margin="10,0,0,0" Content="{Binding Item}" IsChecked="{Binding IsChecked, Mode=TwoWay}" />
+		</DataTemplate>
+		<RecyclingElementFactory x:Key="elementFactory" RecyclePool="{StaticResource RecyclePool}">
+			<RecyclingElementFactory.Templates>
+				<StaticResource x:Key="queuedBook" ResourceKey="queuedBook" />
+			</RecyclingElementFactory.Templates>
+		</RecyclingElementFactory>
+	</UserControl.Resources>
+
+	<ScrollViewer
+		Name="scroller"
+		HorizontalScrollBarVisibility="Disabled"
+		VerticalScrollBarVisibility="Auto">
+		<ItemsRepeater IsVisible="True"
+			VerticalCacheLength="1.2"
+			HorizontalCacheLength="1"
+			Items="{Binding CheckboxItems}"
+			ItemTemplate="{StaticResource elementFactory}" />
+	</ScrollViewer>
+</UserControl>

Source/HangoverAvalonia/Controls/CheckedListBox.axaml.cs

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+using Avalonia;
+using Avalonia.Collections;
+using Avalonia.Controls;
+using DataLayer;
+using HangoverAvalonia.ViewModels;
+using NPOI.XSSF.Streaming.Properties;
+using ReactiveUI;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+
+namespace HangoverAvalonia.Controls
+{
+	public partial class CheckedListBox : UserControl
+	{
+		public event EventHandler<ItemCheckEventArgs> ItemCheck;
+
+		public static readonly StyledProperty<IEnumerable> ItemsProperty =
+		AvaloniaProperty.Register<CheckedListBox, IEnumerable>(nameof(Items));
+
+		public IEnumerable Items { get => GetValue(ItemsProperty); set => SetValue(ItemsProperty, value); }
+		private CheckedListBoxViewModel _viewModel = new();
+
+		public IEnumerable<object> CheckedItems =>
+			_viewModel
+			.CheckboxItems
+			.Where(i => i.IsChecked)
+			.Select(i => i.Item);
+
+		public void SetItemChecked(int i, bool isChecked) => _viewModel.CheckboxItems[i].IsChecked = isChecked;
+		public void SetItemChecked(object item, bool isChecked)
+		{
+			var obj = _viewModel.CheckboxItems.SingleOrDefault(i => i.Item == item);
+			if (obj is not null)
+				obj.IsChecked = isChecked;
+		}
+
+		public CheckedListBox()
+		{
+			InitializeComponent();
+			scroller.DataContext = _viewModel;
+			_viewModel.CheckedChanged += _viewModel_CheckedChanged;
+		}
+
+		private void _viewModel_CheckedChanged(object sender, CheckBoxViewModel e)
+		{
+			var args = new ItemCheckEventArgs { Item = e.Item, ItemIndex = _viewModel.CheckboxItems.IndexOf(e), IsChecked = e.IsChecked };
+			ItemCheck?.Invoke(this, args);
+		}
+
+		protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+		{
+			if (change.Property.Name == nameof(Items) && Items != null)
+				_viewModel.SetItems(Items);
+			base.OnPropertyChanged(change);
+		}
+
+		public class CheckedListBoxViewModel : ViewModelBase
+		{
+			public event EventHandler<CheckBoxViewModel> CheckedChanged;
+			public AvaloniaList<CheckBoxViewModel> CheckboxItems { get; private set; }
+
+			public void SetItems(IEnumerable items)
+			{
+				UnsubscribeFromItems(CheckboxItems);
+				CheckboxItems = new(items.OfType<object>().Select(o => new CheckBoxViewModel { Item = o }));
+				SubscribeToItems(CheckboxItems);
+				this.RaisePropertyChanged(nameof(CheckboxItems));
+			}
+
+			private void SubscribeToItems(IEnumerable objects)
+			{
+				foreach (var i in objects.OfType<INotifyPropertyChanged>())
+					i.PropertyChanged += I_PropertyChanged;
+			}
+
+			private void UnsubscribeFromItems(AvaloniaList<CheckBoxViewModel> objects)
+			{
+				if (objects is null) return;
+
+				foreach (var i in objects)
+					i.PropertyChanged -= I_PropertyChanged;
+			}
+			private void I_PropertyChanged(object sender, PropertyChangedEventArgs e)
+			{
+				CheckedChanged?.Invoke(this, (CheckBoxViewModel)sender);
+			}
+		}
+		public class CheckBoxViewModel : ViewModelBase
+		{
+			private bool _isChecked;
+			public bool IsChecked { get => _isChecked; set => this.RaiseAndSetIfChanged(ref _isChecked, value); }
+			private object _bookText;
+			public object Item { get => _bookText; set => this.RaiseAndSetIfChanged(ref _bookText, value); }
+		}
+	}
+
+	public class ItemCheckEventArgs : EventArgs
+	{
+		public int ItemIndex { get; init; }
+		public bool IsChecked { get; init; }
+		public object Item { get; init; }
+	}
+}