Upgrade Avalonia

src/Artemis.UI/Screens/Workshop/SubmissionWizard/Steps/WelcomeStepView.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="Artemis.UI.Screens.Workshop.SubmissionWizard.Steps.WelcomeStepView">
+    <StackPanel>
+        <TextBlock>Welcome to the Workshop Submission Wizard 🧙</TextBlock>
+        <TextBlock>Here we'll take you, step by step, through the process of uploading your submission to the workshop.</TextBlock>
+    </StackPanel>
+</UserControl>

src/Artemis.UI/Screens/Workshop/SubmissionWizard/Steps/WelcomeStepView.axaml.cs

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+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.SubmissionWizard.Steps;
+
+public partial class WelcomeStepView : ReactiveUserControl<WelcomeStepViewModel>
+{
+    public WelcomeStepView()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/Artemis.UI/Screens/Workshop/SubmissionWizard/Steps/WelcomeStepViewModel.cs

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+using System.Reactive;
+using ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.SubmissionWizard.Steps;
+
+public class WelcomeStepViewModel : SubmissionViewModel
+{
+    #region Overrides of SubmissionViewModel
+
+    /// <inheritdoc />
+    public override ReactiveCommand<Unit, Unit> Continue { get; }
+
+    /// <inheritdoc />
+    public override ReactiveCommand<Unit, Unit> GoBack { get; } = null!;
+
+    public WelcomeStepViewModel()
+    {
+        ShowGoBack = false;
+    }
+
+    #endregion
+}

src/Artemis.UI/Screens/Workshop/SubmissionWizard/SubmissionWizardView.axaml

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+<Window 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"
+        xmlns:controls="clr-namespace:FluentAvalonia.UI.Controls;assembly=FluentAvalonia"
+        xmlns:submissionWizard="clr-namespace:Artemis.UI.Screens.Workshop.SubmissionWizard"
+        xmlns:avalonia="clr-namespace:Material.Icons.Avalonia;assembly=Material.Icons.Avalonia"
+        xmlns:ui="clr-namespace:Artemis.UI"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Artemis.UI.Screens.Workshop.SubmissionWizard.SubmissionWizardView"
+        x:DataType="submissionWizard:SubmissionWizardViewModel"
+        Icon="/Assets/Images/Logo/application.ico"
+        Title="Artemis | Workshop submission wizard"
+        Width="1000"
+        Height="735"
+        WindowStartupLocation="CenterOwner">
+    <Grid Margin="15" RowDefinitions="Auto,*,Auto">
+        <Grid RowDefinitions="*,*" ColumnDefinitions="Auto,*,Auto" Margin="0 0 0 15">
+            <ContentControl Grid.Column="0" Grid.RowSpan="2" Width="65" Height="65" VerticalAlignment="Center" Margin="0 0 20 0" Content="{CompiledBinding CurrentUserViewModel}"/>
+            <TextBlock Grid.Row="0" Grid.Column="1" FontSize="36" VerticalAlignment="Bottom" Text="{CompiledBinding CurrentUserViewModel.Name, FallbackValue=Not logged in}"/>
+
+            <StackPanel Grid.Row="0" Grid.Column="2" HorizontalAlignment="Right" VerticalAlignment="Bottom" Orientation="Horizontal">
+                <controls:HyperlinkButton Classes="icon-button" ToolTip.Tip="View Wiki" NavigateUri="https://wiki.artemis-rgb.com?mtm_campaign=artemis&amp;mtm_kwd=workshop-wizard">
+                    <avalonia:MaterialIcon Kind="BookOpenOutline" />
+                </controls:HyperlinkButton>
+            </StackPanel>
+
+            <TextBlock Grid.Row="1"
+                       Grid.Column="1"
+                       VerticalAlignment="Top"
+                       Classes="subtitle"
+                       Text="New workshop submission" />
+        </Grid>
+
+        <Border Classes="card" Grid.Row="1" Grid.Column="0">
+            <controls:Frame Name="Frame" IsNavigationStackEnabled="False" CacheSize="0">
+                <controls:Frame.NavigationPageFactory>
+                    <ui:PageFactory/>
+                </controls:Frame.NavigationPageFactory>
+            </controls:Frame>
+        </Border>
+
+        <StackPanel Grid.Row="2" Grid.Column="0" HorizontalAlignment="Right" Orientation="Horizontal" Spacing="5" Margin="0 15 0 0">
+            <Button Command="{CompiledBinding Screen.GoBack}" IsVisible="{CompiledBinding Screen.ShowGoBack}">
+                Back
+            </Button>
+            <Button Command="{CompiledBinding Screen.Continue}" IsVisible="{CompiledBinding !Screen.ShowFinish}" Width="80">
+                Continue
+            </Button>
+            <Button Command="{CompiledBinding Screen.Continue}" IsVisible="{CompiledBinding Screen.ShowFinish}" Width="80">
+                Finish
+            </Button>
+        </StackPanel>
+    </Grid>
+
+</Window>

src/Artemis.UI/Screens/Workshop/SubmissionWizard/SubmissionWizardView.axaml.cs

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+using System;
+using System.Reactive.Disposables;
+using Artemis.UI.Shared;
+using Avalonia;
+using Avalonia.Threading;
+using ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.SubmissionWizard;
+
+public partial class SubmissionWizardView : ReactiveAppWindow<SubmissionWizardViewModel>
+{
+    public SubmissionWizardView()
+    {
+        InitializeComponent();
+#if DEBUG
+        this.AttachDevTools();
+#endif
+
+        this.WhenActivated(d => ViewModel.WhenAnyValue(vm => vm.Screen).Subscribe(Navigate).DisposeWith(d));
+    }
+
+    private void Navigate(SubmissionViewModel viewModel)
+    {
+        try
+        {
+            Dispatcher.UIThread.Invoke(() => Frame.NavigateFromObject(viewModel));
+        }
+        catch (Exception)
+        {
+            // ignored
+        }
+    }
+}

src/Artemis.UI/Screens/Workshop/SubmissionWizard/SubmissionWizardViewModel.cs

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+using System.Reactive;
+using Artemis.UI.Screens.Workshop.CurrentUser;
+using Artemis.UI.Screens.Workshop.SubmissionWizard.Steps;
+using Artemis.UI.Shared;
+using ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.SubmissionWizard;
+
+public class SubmissionWizardViewModel : DialogViewModelBase<bool>
+{
+    private SubmissionViewModel _screen;
+
+    public SubmissionWizardViewModel(CurrentUserViewModel currentUserViewModel)
+    {
+        _screen = new WelcomeStepViewModel();
+        CurrentUserViewModel = currentUserViewModel;
+    }
+
+    public CurrentUserViewModel CurrentUserViewModel { get; }
+
+    public SubmissionViewModel Screen
+    {
+        get => _screen;
+        set => RaiseAndSetIfChanged(ref _screen, value);
+    }
+}
+
+public abstract class SubmissionViewModel : ActivatableViewModelBase
+{
+    private bool _showFinish;
+    private bool _showGoBack = true;
+
+    public abstract ReactiveCommand<Unit, Unit> Continue { get; }
+    public abstract ReactiveCommand<Unit, Unit> GoBack { get; }
+
+    public bool ShowGoBack
+    {
+        get => _showGoBack;
+        set => RaiseAndSetIfChanged(ref _showGoBack, value);
+    }
+
+    public bool ShowFinish
+    {
+        get => _showFinish;
+        set => RaiseAndSetIfChanged(ref _showFinish, value);
+    }
+}