From 42ee95b6ccfd87cc764bf858c910baab15bd029a Mon Sep 17 00:00:00 2001
From: BDisp <bd.bdisp@gmail.com>
Date: Sun, 7 Jul 2024 22:41:02 +0100
Subject: [PATCH] Fix FSharpExample using the simple example.

---
 FSharpExample/FSharpExample.fsproj |   4 +-
 FSharpExample/Program.fs           | 486 +++--------------------------
 2 files changed, 42 insertions(+), 448 deletions(-)

diff --git a/FSharpExample/FSharpExample.fsproj b/FSharpExample/FSharpExample.fsproj
index 9effec9fd..82b2802e5 100644
--- a/FSharpExample/FSharpExample.fsproj
+++ b/FSharpExample/FSharpExample.fsproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyVersion>1.6.2.0</AssemblyVersion>
     <FileVersion>1.6.2.0</FileVersion>
     <InformationalVersion>1.6.2+Branch.main.Sha.b6eeb6321685af474ffc17b1390ff1d4894a90c5</InformationalVersion>
@@ -14,6 +14,6 @@
     <ProjectReference Include="..\Terminal.Gui\Terminal.Gui.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Update="FSharp.Core" Version="6.0.0" />
+    <PackageReference Update="FSharp.Core" Version="8.0.300" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/FSharpExample/Program.fs b/FSharpExample/Program.fs
index bfeaef2ed..88d801f04 100644
--- a/FSharpExample/Program.fs
+++ b/FSharpExample/Program.fs
@@ -1,454 +1,48 @@
-open System
-open System.Diagnostics
-open System.Globalization
-open System.IO
-open NStack
-open Terminal.Gui
+open Terminal.Gui
 
-let ustr (x: string) = ustring.Make(x)
-let mutable ml2 = Unchecked.defaultof<Label>
-let mutable ml = Unchecked.defaultof<Label>
-let mutable menu = Unchecked.defaultof<MenuBar>
-let mutable menuKeysStyle = Unchecked.defaultof<CheckBox>
-let mutable menuAutoMouseNav = Unchecked.defaultof<CheckBox>
-
-type Box10x (x: int, y: int) =
-    inherit View (Rect(x, y, 20, 10))
-    let w = 40
-    let h = 50
-
-    new () =
-        new Box10x ()
-
-    member _.GetContentSize () =
-        Size (w, h)
-
-    member _.SetCursorPosition (_ : Point) =
-        raise (NotImplementedException())
-
-    override this.Redraw (_: Rect) =
-        Application.Driver.SetAttribute this.ColorScheme.Focus
-        do
-        let mutable y = 0
-        while y < h do
-        this.Move (0, y)
-        Application.Driver.AddStr (ustr (string y))
-        do
-        let mutable x = 0
-        while x < w - (y.ToString ()).Length do
-            if (string y).Length < w
-            then Application.Driver.AddStr (ustr " ")
-            x <- x + 1
-        y <- y + 1
-
-type Filler (rect: Rect) =
-    inherit View(rect)
-    new () =
-        new Filler ()
-
-    override this.Redraw (_: Rect) =
-        Application.Driver.SetAttribute this.ColorScheme.Focus
-        let mutable f = this.Frame
-        do
-        let mutable y = 0
-        while y < f.Width do
-        this.Move (0, y)
-        do
-        let mutable x = 0
-        while x < f.Height do
-            let r =
-                match x % 3 with
-                | 0 ->
-                    Application.Driver.AddRune ((Rune ((string y).ToCharArray (0, 1)).[0]))
-                    if y > 9 then
-                        Application.Driver.AddRune ((Rune ((string y).ToCharArray (1, 1)).[0]))
-                    Rune '.'
-                | 1 -> Rune 'o'
-                | _ -> Rune 'O'
-            Application.Driver.AddRune r
-            x <- x + 1
-        y <- y + 1
-
-let ShowTextAlignments () =
-    let okButton = new Button (ustr "Ok", true)
-    okButton.add_Clicked (Action (Application.RequestStop))
-    let cancelButton = new Button (ustr "Cancel", true)
-    cancelButton.add_Clicked (Action (Application.RequestStop))
-
-    let container = new Dialog (ustr "Text Alignments", 50, 20, okButton, cancelButton)
-    let txt = "Hello world, how are you doing today"
-    container.Add (
-        new Label (Rect(0, 1, 40, 3), ustr ((sprintf "%O-%O" 1) txt), TextAlignment = TextAlignment.Left),
-        new Label (Rect(0, 3, 40, 3), ustr ((sprintf "%O-%O" 2) txt), TextAlignment = TextAlignment.Right),
-        new Label (Rect(0, 5, 40, 3), ustr ((sprintf "%O-%O" 3) txt), TextAlignment = TextAlignment.Centered),
-        new Label (Rect(0, 7, 40, 3), ustr ((sprintf "%O-%O" 4) txt), TextAlignment = TextAlignment.Justified))
-    Application.Run container
-
-let ShowEntries (container: View) =
-    let scrollView = 
-        new ScrollView (Rect (50, 10, 20, 8),
-            ContentSize = Size (20, 50),
-            ShowVerticalScrollIndicator = true,
-            ShowHorizontalScrollIndicator = true)
-    scrollView.Add (new Filler (Rect (0, 0, 40, 40)))
-    let scrollView2 = 
-        new ScrollView (Rect (72, 10, 3, 3),
-            ContentSize = Size (100, 100),
-            ShowVerticalScrollIndicator = true,
-            ShowHorizontalScrollIndicator = true)
-    scrollView2.Add (new Box10x (0, 0))
-    let progress = new ProgressBar (Rect(68, 1, 10, 1))
-    let timer = Func<MainLoop, bool> (fun _ ->
-        progress.Pulse ()
-        true)
-
-    Application.MainLoop.AddTimeout (TimeSpan.FromMilliseconds (300.), timer) |> ignore
-
-    let login =
-        new Label (ustr "Login: ",
-            X = Pos.At 3,
-            Y = Pos.At 6)
-    let password =
-        new Label (ustr "Password: ",
-            X = Pos.Left login,
-            Y = Pos.Bottom login + Pos.At 1)
-    let loginText =
-        new TextField (ustr "",
-            X = Pos.Right password,
-            Y = Pos.Top login,
-            Width = Dim.op_Implicit 40)
-    let passText =
-        new TextField (ustr "",
-            Secret = true,
-            X = Pos.Left loginText,
-            Y = Pos.Top password,
-            Width = Dim.Width loginText)
-    let tf = new Button (3, 19, ustr "Ok")
-    container.Add (login, loginText, password, passText,
-        new FrameView (Rect (3, 10, 25, 6), ustr "Options",
-            [| new CheckBox (1, 0, ustr "Remember me")
-               new RadioGroup (1, 2, 
-                [| ustr "_Personal"; ustr "_Company"|])|]),
-        new ListView (Rect (59, 6, 16, 4),
-                [| "First row"
-                   "<>"
-                   "This is a very long row that should overflow what is shown"
-                   "4th"
-                   "There is an empty slot on the second row"
-                   "Whoa"
-                   "This is so cool" |]),
-        scrollView, scrollView2, tf,
-        new Button (10, 19, ustr "Cancel"),
-        new TimeField (3, 20, DateTime.Now.TimeOfDay),
-        new TimeField (23, 20, DateTime.Now.TimeOfDay, true),
-        new DateField (3, 22, DateTime.Now),
-        new DateField (23, 22, DateTime.Now, true),
-        progress,
-        new Label (3, 24, ustr "Press F9 (on Unix, ESC+9 is an alias) to activate the menubar"),
-        menuKeysStyle,
-        menuAutoMouseNav)
-    container.SendSubviewToBack tf
-
-let NewFile () =
-    let okButton = new Button (ustr "Ok", true)
-    okButton.add_Clicked (Action (Application.RequestStop))
-    let cancelButton = new Button (ustr "Cancel", true)
-    cancelButton.add_Clicked (Action (Application.RequestStop))
-
-    let d = new Dialog (ustr "New File", 50, 20, okButton, cancelButton)
-    ml2 <- new Label (1, 1, ustr "Mouse Debug Line")
-    d.Add ml2
-    Application.Run d
-
-let GetFileName () =
-    let mutable fname = Unchecked.defaultof<_>
-    for s in [| "/etc/passwd"; "c:\\windows\\win.ini" |] do
-        if File.Exists s
-        then fname <- s
-    fname
-
-let Editor (top: Toplevel) =
-    let tframe = top.Frame
-    let ntop = new Toplevel(tframe)
-    let menu = 
-        new MenuBar(
-            [| MenuBarItem (ustr "_File",
-                 [| MenuItem (ustr "_Close", ustring.Empty, (fun () -> Application.RequestStop ())) |]);
-                    MenuBarItem (ustr "_Edit",
-                        [| MenuItem (ustr "_Copy", ustring.Empty, Unchecked.defaultof<_>)
-                           MenuItem (ustr "C_ut", ustring.Empty, Unchecked.defaultof<_>)
-                           MenuItem (ustr "_Paste", ustring.Empty, Unchecked.defaultof<_>) |]) |])
-    ntop.Add menu
-    let fname = GetFileName ()
-    let win = 
-        new Window (
-            ustr (if not (isNull fname) then fname else "Untitled"),
-            X = Pos.At 0,
-            Y = Pos.At 1,
-            Width = Dim.Fill (),
-            Height = Dim.Fill ())
-    ntop.Add win
-    let text = new TextView (Rect(0, 0, (tframe.Width - 2), (tframe.Height - 3)))
-    if fname <> Unchecked.defaultof<_>
-    then text.Text <- ustr (File.ReadAllText fname)
-    win.Add text
-    Application.Run ntop
-
-let Quit () =
-    MessageBox.Query (50, 7, ustr "Quit Demo", ustr "Are you sure you want to quit this demo?", ustr "Yes", ustr "No") = 0
-
-let Close () =
-    MessageBox.ErrorQuery (50, 7, ustr "Error", ustr "There is nothing to close", ustr "Ok")
-    |> ignore
-
-let Open () =
-    let d = new OpenDialog (ustr "Open", ustr "Open a file", AllowsMultipleSelection = true)
-    Application.Run d
-    if not d.Canceled
-        then MessageBox.Query (50, 7, ustr "Selected File", ustr (String.Join (", ", d.FilePaths)), ustr "Ok") |> ignore
-
-let ShowHex (top: Toplevel) =
-    let tframe = top.Frame
-    let ntop = new Toplevel (tframe)
-    let menu = 
-        new MenuBar (
-            [| MenuBarItem (ustr "_File",
-                 [| MenuItem (ustr "_Close", ustring.Empty, (fun () -> Application.RequestStop ())) |]) |])
-    ntop.Add menu
-    let win =
-        new Window (ustr "/etc/passwd",
-            X = Pos.At 0,
-            Y = Pos.At 1,
-            Width = Dim.Fill (),
-            Height = Dim.Fill ())
-    ntop.Add win
-    let fname = GetFileName ()
-    let source = File.OpenRead fname
-    let hex = 
-        new HexView (source,
-            X = Pos.At 0,
-            Y = Pos.At 0,
-            Width = Dim.Fill (),
-            Height = Dim.Fill ())
-    win.Add hex
-    Application.Run ntop
-
-type MenuItemDetails () =
-    inherit MenuItem ()
-    new (title: ustring, help: ustring, action: Action) as this =
-        MenuItemDetails ()
-        then
-            this.Title <- title
-            this.Help <- help
-            this.Action <- action
-
-    static member Instance (mi: MenuItem) =
-        (mi.GetMenuItem ()) :?> MenuItemDetails
-
-type MenuItemDelegate = delegate of MenuItemDetails -> MenuItem
-
-let ShowMenuItem (mi: MenuItemDetails) =
-    MessageBox.Query (70, 7, ustr (mi.Title.ToString ()),
-        ustr ((sprintf "%O selected. Is from submenu: %O" (mi.Title.ToString ())) (mi.GetMenuBarItem ())), ustr "Ok")
-    |> ignore
-
-let MenuKeysStyleToggled (_: bool) =
-    menu.UseKeysUpDownAsKeysLeftRight <- menuKeysStyle.Checked
-
-let MenuAutoMouseNavToggled (_: bool) =
-    menu.WantMousePositionReports <- menuAutoMouseNav.Checked
-
-let Copy () =
-    let textField = menu.LastFocused :?> TextField
-    if textField <> Unchecked.defaultof<_> && textField.SelectedLength <> 0
-    then textField.Copy ()
-
-let Cut () =
-    let textField = menu.LastFocused :?> TextField
-    if textField <> Unchecked.defaultof<_> && textField.SelectedLength <> 0
-    then textField.Cut ()
-
-let Paste () =
-    let textField = menu.LastFocused :?> TextField
-    if textField <> Unchecked.defaultof<_>
-    then textField.Paste ()
-
-let Help () =
-    MessageBox.Query (50, 7, ustr "Help", ustr "This is a small help\nBe kind.", ustr "Ok")
-    |> ignore
-
-let Load () =
-    MessageBox.Query (50, 7, ustr "Load", ustr "This is a small load\nBe kind.", ustr "Ok")
-    |> ignore
-
-let Save () =
-    MessageBox.Query (50, 7, ustr "Save ", ustr "This is a small save\nBe kind.", ustr "Ok")
-    |> ignore
-
-let ListSelectionDemo (multiple: bool) =
-    let okButton = new Button (ustr "Ok", true)
-    okButton.add_Clicked (Action (Application.RequestStop))
-    let cancelButton = new Button (ustr "Cancel")
-    cancelButton.add_Clicked (Action (Application.RequestStop))
-
-    let d = new Dialog (ustr "Selection Demo", 60, 20, okButton, cancelButton)
-    let animals = ResizeArray<_> ()
-    animals.AddRange([| "Alpaca"; "Llama"; "Lion"; "Shark"; "Goat" |])
-    let msg =
-        new Label (ustr "Use space bar or control-t to toggle selection",
-            X = Pos.At 1,
-            Y = Pos.At 1,
-            Width = Dim.Fill () - Dim.op_Implicit 1,
-            Height = Dim.op_Implicit 1)
-    let list =
-        new ListView (animals,
-            X = Pos.At 1,
-            Y = Pos.At 3,
-            Width = Dim.Fill () - Dim.op_Implicit 4,
-            Height = Dim.Fill () - Dim.op_Implicit 4,
-            AllowsMarking = true,
-            AllowsMultipleSelection = multiple)
-    d.Add (msg, list)
-    Application.Run d
-    let mutable result = ""
+type ExampleWindow() as this =
+    inherit Window()
+    
     do
-        let mutable i = 0
-        while i < animals.Count do
-        if list.Source.IsMarked i
-        then result <- result + animals.[i] + " "
-        i <- i + 1
-    MessageBox.Query (60, 10, ustr "Selected Animals", ustr (if result = "" then "No animals selected" else result), ustr "Ok") |> ignore
+        this.Title <- sprintf "Example App (%O to quit)" Application.QuitKey
 
-let OnKeyDownPressUpDemo () =
-    let closeButton = new Button (ustr "Close")
-    closeButton.add_Clicked (Action (Application.RequestStop))
+        // Create input components and labels
+        let usernameLabel = new Label(Text = "Username:")
 
-    let container = new Dialog (ustr "KeyDown & KeyPress & KeyUp demo", 80, 20, closeButton, Width = Dim.Fill (), Height = Dim.Fill ())
-    
-    let list = ResizeArray<_> ()
-    let listView = 
-        new ListView (list,
-            X = Pos.At 0,
-            Y = Pos.At 0,
-            Width = Dim.Fill () - Dim.op_Implicit 1,
-            Height = Dim.Fill () - Dim.op_Implicit 2,
-            ColorScheme = Colors.TopLevel)
-    container.Add (listView)
-    
-    let keyDownPressUp (keyEvent: KeyEvent, updown: string) =
-        match updown with
-        | "Down"
-        | "Up"
-        | "Press" -> 
-            list.Add (keyEvent.ToString ())    
-        | _ -> failwithf "Unknown: %s" updown
-        listView.MoveDown ()
+        let userNameText = new TextField(X = Pos.Right(usernameLabel) + Pos.op_Implicit(1), Width = Dim.Fill())
 
-    container.add_KeyDown(Action<View.KeyEventEventArgs> (fun (e: View.KeyEventEventArgs) -> keyDownPressUp (e.KeyEvent, "Down") |> ignore))
-    container.add_KeyPress(Action<View.KeyEventEventArgs> (fun (e: View.KeyEventEventArgs) -> keyDownPressUp (e.KeyEvent, "Press") |> ignore))
-    container.add_KeyUp(Action<View.KeyEventEventArgs> (fun (e: View.KeyEventEventArgs) -> keyDownPressUp (e.KeyEvent, "Up") |> ignore))
-    Application.Run (container)
+        let passwordLabel = new Label(Text = "Password:", X = Pos.Left(usernameLabel), Y = Pos.Bottom(usernameLabel) +  Pos.op_Implicit(1))
 
-let Main () =
-    if Debugger.IsAttached then
-        CultureInfo.DefaultThreadCurrentUICulture <- CultureInfo.GetCultureInfo ("en-US")
-    Application.Init()
-    let top = Application.Top
-    let margin = 3
-    let win = 
-        new Window (ustr "Hello",
-            X = Pos.At 1,
-            Y = Pos.At 1,
-            Width = Dim.Fill () - Dim.op_Implicit margin,
-            Height = Dim.Fill () - Dim.op_Implicit margin)
-    let menuItems =
-        [|MenuItemDetails (ustr "F_ind",ustr "", Unchecked.defaultof<_>);
-            MenuItemDetails (ustr "_Replace", ustr "", Unchecked.defaultof<_>);
-            MenuItemDetails (ustr "_Item1", ustr "", Unchecked.defaultof<_>);
-            MenuItemDetails (ustr "_Also From Sub Menu", ustr "", Unchecked.defaultof<_>)|]
-    menuItems.[0].Action <- fun _ -> ShowMenuItem (menuItems.[0])
-    menuItems.[1].Action <- fun _ -> ShowMenuItem (menuItems.[1])
-    menuItems.[2].Action <- fun _ -> ShowMenuItem (menuItems.[2])
-    menuItems.[3].Action <- fun _ -> ShowMenuItem (menuItems.[3])
-    menu <-
-        new MenuBar (
-            [| MenuBarItem(ustr "_File",
-                    [| MenuItem (ustr "Text _Editor Demo", ustring.Empty, (fun () -> Editor top))
-                       MenuItem (ustr "_New", ustr "Creates new file", fun () -> NewFile())
-                       MenuItem (ustr "_Open", ustring.Empty, fun () -> Open())
-                       MenuItem (ustr "_Hex", ustring.Empty, (fun () -> ShowHex top))
-                       MenuItem (ustr "_Close", ustring.Empty, (fun () -> Close()))
-                       MenuItem (ustr "_Disabled", ustring.Empty, (fun () -> ()), (fun () -> false))
-                       Unchecked.defaultof<_>
-                       MenuItem (ustr "_Quit", ustring.Empty, (fun () -> if Quit() then top.Running <- false)) |])
-               MenuBarItem (ustr "_Edit",
-                    [| MenuItem (ustr "_Copy", ustring.Empty, fun () -> Copy())
-                       MenuItem (ustr "C_ut", ustring.Empty, fun () -> Cut())
-                       MenuItem (ustr "_Paste", ustring.Empty, fun () -> Paste())
-                       MenuBarItem (ustr "_Find and Replace",
-                           [| menuItems.[0] :> MenuItem
-                              menuItems.[1] :> MenuItem |]) :> MenuItem
-                       menuItems.[3] :> MenuItem
-                    |])
-               MenuBarItem (ustr "_List Demos", 
-                    [| MenuItem (ustr "Select _Multiple Items", ustring.Empty, (fun () -> ListSelectionDemo true))
-                       MenuItem (ustr "Select _Single Item", ustring.Empty, (fun () -> ListSelectionDemo false)) |])   
-               MenuBarItem (ustr "A_ssorted",
-                    [| MenuItem (ustr "_Show text alignments", ustring.Empty, (fun () -> ShowTextAlignments())) 
-                       MenuItem (ustr "_OnKeyDown/Press/Up", ustring.Empty, (fun () -> OnKeyDownPressUpDemo())) |])
-               MenuBarItem (ustr "_Test Menu and SubMenus",
-                    [| MenuBarItem (ustr "SubMenu1Item_1",
-                            [| MenuBarItem (ustr "SubMenu2Item_1",
-                                    [| MenuBarItem (ustr "SubMenu3Item_1",
-                                            [| menuItems.[2] :> MenuItem |]) :> MenuItem
-                                    |]) :> MenuItem
-                            |]) :> MenuItem
-                    |])
-               MenuBarItem (ustr "_About...", ustr "Demonstrates top-level menu item", (fun () -> MessageBox.ErrorQuery (50, 7, ustr "Error", ustr "This is a demo app for gui.cs", ustr "Ok") |> ignore)) |])
-    menuKeysStyle <- new CheckBox (3, 25, ustr "UseKeysUpDownAsKeysLeftRight", true)
-    menuKeysStyle.add_Toggled (Action<bool> (MenuKeysStyleToggled))
-    menuAutoMouseNav <- new CheckBox (40, 25, ustr "UseMenuAutoNavigation", true)
-    menuAutoMouseNav.add_Toggled (Action<bool> (MenuAutoMouseNavToggled))
-    ShowEntries win
-    let mutable count = 0
-    ml <- new Label (Rect (3, 17, 47, 1), ustr "Mouse: ")
-    Application.RootMouseEvent <- Action<MouseEvent> (
-            fun (me: MouseEvent) ->
-                ml.Text <- ustr (
-                     (((sprintf "Mouse: (%O,%O) - %O %O" me.X) me.Y) me.Flags) (count <- count + 1; count)))
-    let test = new Label (3, 18, ustr "Se iniciará el análisis")
-    win.Add test
-    win.Add ml
-    let drag = new Label (ustr "Drag: ", X = Pos.At 70, Y = Pos.At 24)
-    let dragText = 
-        new TextField (ustr "",
-            X = Pos.Right drag,
-            Y = Pos.Top drag,
-            Width = Dim.op_Implicit 40)
-    let statusBar = new StatusBar ([|
-        StatusItem(Key.F1, ustr "~F1~ Help", Action Help)
-        StatusItem(Key.F2, ustr "~F2~ Load", Action Load)
-        StatusItem(Key.F3, ustr "~F3~ Save", Action Save)
-        StatusItem(Key.Q, ustr "~^Q~ Quit", fun () -> if (Quit()) then top.Running <- false) |])
-    win.Add (drag, dragText)
-    let bottom = new Label (ustr "This should go on the bottom of the same top-level!")
-    win.Add bottom
-    let bottom2 = new Label (ustr "This should go on the bottom of another top-level!")
-    top.Add bottom2
-    top.add_LayoutComplete (Action<View.LayoutEventArgs>
-        (fun e ->
-            bottom.X <- win.X
-            bottom.Y <- Pos.Bottom win - Pos.Top win - Pos.At margin
-            bottom2.X <- Pos.Left win
-            bottom2.Y <- Pos.Bottom win)
+        let passwordText = new TextField(Secret = true, X = Pos.Left(userNameText), Y = Pos.Top(passwordLabel), Width = Dim.Fill())
+
+        // Create login button
+        let btnLogin = new Button(Text = "Login", Y = Pos.Bottom(passwordLabel) +  Pos.op_Implicit(1), X = Pos.Center(), IsDefault = true)
+
+        // When login button is clicked display a message popup
+        btnLogin.Accept.Add(fun _ ->
+            if userNameText.Text = "admin" && passwordText.Text = "password" then
+                MessageBox.Query("Logging In", "Login Successful", "Ok") |> ignore
+                ExampleWindow.UserName <- userNameText.Text.ToString()
+                Application.RequestStop()
+            else
+                MessageBox.ErrorQuery("Logging In", "Incorrect username or password", "Ok") |> ignore
         )
-    top.Add win
-    top.Add (menu, statusBar)
-    Application.Run ()
-    Application.Shutdown ();
 
-module Demo =
-    [<EntryPoint>]
-    let main _ =
-        Main ()
-        0
\ No newline at end of file
+        // Add the views to the Window
+        this.Add(usernameLabel, userNameText, passwordLabel, passwordText, btnLogin)
+
+    static member val UserName = "" with get, set
+
+[<EntryPoint>]
+let main argv =
+    Application.Init()
+    Application.Run<ExampleWindow>().Dispose()
+    
+    // Before the application exits, reset Terminal.Gui for clean shutdown
+    Application.Shutdown()
+    
+    // To see this output on the screen it must be done after shutdown,
+    // which restores the previous screen.
+    printfn "Username: %s" ExampleWindow.UserName
+    
+    0 // return an integer exit code