Close confirmation is now working.

Progrart/Dialogs/CloseConfirmationDialog.axaml

@@ -5,8 +5,12 @@
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="Progrart.Dialogs.CloseConfirmationDialog">
 	<StackPanel>
-		<TextBlock FontSize="18" Name="TitleBlock" TextWrapping="Wrap"/>
-		<TextBlock Name="MessageBlock" TextWrapping="Wrap"/>
+		<TextBlock FontSize="18" Name="TitleBlock" TextWrapping="Wrap">
+			Unsaved Changes
+		</TextBlock>
+		<TextBlock Name="MssageBlock" TextWrapping="Wrap">
+			Save all files or discard changes?
+		</TextBlock>
 		<Grid>
 			<Grid.ColumnDefinitions>
 				<ColumnDefinition/>
@@ -14,7 +18,7 @@
 				<ColumnDefinition/>
 			</Grid.ColumnDefinitions>
 			<Button HorizontalAlignment="Stretch" HorizontalContentAlignment="Center" Classes="accent" Name="OKBtn" Content="Save All"/>
-			<Button HorizontalAlignment="Stretch" HorizontalContentAlignment="Center" Classes="accent" Grid.Column="1" Name="DiscardBtn" Content="Discard And Close"/>
+			<Button HorizontalAlignment="Stretch" HorizontalContentAlignment="Center" Grid.Column="1" Name="DiscardBtn" Content="Discard And Close"/>
 			<Button HorizontalAlignment="Stretch" HorizontalContentAlignment="Center" Name="CancelBtn" Grid.Column="2" Content="Cancel"/>
 		</Grid>
 	</StackPanel>

Progrart/Dialogs/CloseConfirmationDialog.axaml.cs

@@ -1,13 +1,64 @@
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
+using DialogHostAvalonia;
+using System;
+using System.Threading.Tasks;
 
 namespace Progrart.Dialogs;
 
 public partial class CloseConfirmationDialog : UserControl
 {
+	public Func<Task<bool>>? onOK = null;
+	public Func<Task<bool>>? onDiscard = null;
+	public Func<bool>? onCancel = null;
 	public CloseConfirmationDialog()
 	{
 		InitializeComponent();
+		OKBtn.Click += OKBtn_Click;
+		CancelBtn.Click += CancelBtn_Click;
+		DiscardBtn.Click += async (sender, e) => await Discard();
+	}
+	private void CancelBtn_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+	{
+		Cancel();
+	}
+
+	private void Cancel()
+	{
+		if (!(onCancel?.Invoke()) ?? true)
+		{
+			DialogHost.Close(null);
+		}
+	}
+
+	private async void OKBtn_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+	{
+		await Confirmed();
+	}
+
+	private async Task Confirmed()
+	{
+		if (onOK is not null)
+		{
+			if (!await onOK())
+			{
+				DialogHost.Close(null);
+			}
+		}
+		else
+			DialogHost.Close(null);
+	}
+	private async Task Discard()
+	{
+		if (onDiscard is not null)
+		{
+			if (!await onDiscard())
+			{
+				DialogHost.Close(null);
+			}
+		}
+		else
+			DialogHost.Close(null);
 	}
 }

Progrart/Views/MainView.axaml.cs

@@ -222,12 +222,21 @@ public partial class MainView : UserControl
 
 	private void MenuItem_SaveAll_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
 	{
-		Task.Run(async () => await MainTabHost.Foreach(async (page) =>
+		SaveAll();
+	}
+
+	private void SaveAll(Action? OnDone = null)
+	{
+		Task.Run(async () =>
+		{
+			await MainTabHost.Foreach(async (page) =>
 					{
 						if (page is IEditorPage editor)
 							await editor.Save();
 						return false;
-		}));
+					});
+			OnDone?.Invoke();
+		});
 	}
 
 	private async void CreateProjectMenuItem_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
@@ -310,17 +319,36 @@ public partial class MainView : UserControl
 		});
 		return v;
 	}
-	private void ExitItem_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+	public bool TryExit()
 	{
+
 		if (CloseCheck())
 		{
 			CloseConfirmationDialog dialog = new CloseConfirmationDialog();
-
+			dialog.onOK = async () =>
+			{
+				SaveAll(() =>
+				{
+					Environment.Exit(0);
+				});
+				return false;
+			};
+			dialog.onDiscard = async () =>
+			{
+				Environment.Exit(0);
+				return false;
+			};
 			DialogHost.Show(dialog);
+			return false;
 		}
 		else
 		{
 			Environment.Exit(0);
+			return true;
 		}
 	}
+	private void ExitItem_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+	{
+		TryExit();
+	}
 }

Progrart/Views/MainWindow.axaml

@@ -8,5 +8,5 @@
         x:Class="Progrart.Views.MainWindow"
         Icon="/Assets/Background.png"
         Title="Progrart">
-        <views:MainView />
+        <views:MainView Name="MainAppView"/>
 </Window>

Progrart/Views/MainWindow.axaml.cs

@@ -9,5 +9,12 @@ public partial class MainWindow : Window
 		InitializeComponent();
 		this.ExtendClientAreaToDecorationsHint = true;
 		this.ExtendClientAreaChromeHints = Avalonia.Platform.ExtendClientAreaChromeHints.PreferSystemChrome;
+		this.Closing += MainWindow_Closing;
+	}
+
+	private void MainWindow_Closing(object? sender, WindowClosingEventArgs e)
+	{
+		e.Cancel=!MainAppView.TryExit();
+		
 	}
 }