status dialog / spinner

[snow-jallen]

I'd like to pop up a modal while a background process is running, and then close that model when the background process completes...but I can't quite seem the right combination of dialog/window/etc. to make that happen. What's the best way to show something, and then programmatically hide it once an operation completes?

[BDisp]

Maybe something like this?

static class Program {
	public static ListView lstView;
	public static List<string> logList = new ();
	public static Dialog dlg;

	static void Main ()
	{
		Application.Init ();
		var top = Application.Top;
		var btnStart = new Button ("Start Process");
		btnStart.Clicked += () => {
			RegisterLog ("Starting logging...");
			Application.MainLoop.AddTimeout (TimeSpan.FromMilliseconds (100), PrepareBackgroundProcess);
			StartBackgroundProcessDialog ();
			RegisterLog ("Finished logging...");
		};
		lstView = new ListView (logList) {
			Y = Pos.Y (btnStart) + 1,
			Width = Dim.Fill (),
			Height = Dim.Fill ()
		};
		var win = new Window ("Background Process Sample");
		win.Add (btnStart, lstView);
		top.Add (win);

		bool PrepareBackgroundProcess (MainLoop _)
		{
			if (dlg != null) {
				Application.MainLoop.Invoke (async () => {
					await RunBackgroundProcessAsync ();
				});
			}
			return dlg == null;
		}

		Application.Run ();
	}

	static async Task RunBackgroundProcessAsync ()
	{
		RegisterLog ("Background Process is running...");
		await Task.Delay (1000);
		Application.RequestStop ();
		RegisterLog ("Background Process is finished...");
	}

	static void StartBackgroundProcessDialog ()
	{
		RegisterLog ("Starting the modal dialog...");
		dlg = new Dialog ("This will be closed after the process is finished.");
		Application.Run (dlg);
		RegisterLog ("Stopping the modal dialog...");
	}

	static void RegisterLog (string msg)
	{
		logList.Add (msg);
		lstView.MoveDown ();
	}
}

[BDisp]

I did some changes and added a TextView in the Dialog to demonstrate that you can typing while waiting for the dialog closing.
But honestly, I do not see any advantage of this scene. Perhaps, otherwise is what is desired, that a dialog box pop up when the background process is completed.

static class Program {
	public static ListView lstView;
	public static List<string> logList = new ();
	public static Dialog dlg;

	static void Main ()
	{
		Application.Init ();
		var top = Application.Top;
		var btnStart = new Button ("Start Process");
		btnStart.Clicked += () => {
			RegisterLog ("Starting logging...");
			Application.MainLoop.AddTimeout (TimeSpan.FromMilliseconds (100), PrepareBackgroundProcess);
			StartBackgroundProcessDialog ();
			RegisterLog ("Finished logging...");
		};
		lstView = new ListView (logList) {
			Y = Pos.Y (btnStart) + 1,
			Width = Dim.Fill (),
			Height = Dim.Fill (),
			ColorScheme = Colors.Menu
		};
		var win = new Window ("Background Process Sample");
		win.Add (btnStart, lstView);
		top.Add (win);

		bool PrepareBackgroundProcess (MainLoop _)
		{
			if (dlg != null) {
				Application.MainLoop.Invoke (async () => {
					await RunBackgroundProcessAsync ();
				});
			}
			return dlg == null;
		}

		Application.Run ();
	}

	static async Task RunBackgroundProcessAsync ()
	{
		RegisterLog ("Background Process is running...");
		await Task.Delay (5000);
		Application.RequestStop ();
		RegisterLog ("Background Process is finished...");
	}

	static void StartBackgroundProcessDialog ()
	{
		RegisterLog ("Starting the modal dialog...");
		dlg = new Dialog ("This will be closed after the process is finished.");
		dlg.Add (new Label ("Typing in the text view while this dialog is open:"));
		var txtView = new TextView () {
			Y = 1,
			Width = Dim.Fill (),
			Height = Dim.Fill (),
			ColorScheme = Colors.TopLevel
		};
		bool firstPress = false;
		txtView.KeyPress += (e) => {
			if (!firstPress) {
				firstPress = true;
				RegisterLog ("Starting typing in text view...");
			}
		};
		dlg.Add (txtView);
		Application.Run (dlg);
		RegisterLog ("Stopping the modal dialog...");
	}

	static void RegisterLog (string msg)
	{
		logList.Add (msg);
		lstView.MoveDown ();
	}
}

[hindermath]

For a better ending of the program I added a little menu...

            var menuBar = new MenuBar(new MenuBarItem[]
            {
                new MenuBarItem("_File",
                    new MenuItem[]
                    {
                        new MenuItem("_Exit", "", Application.RequestStop)
                    }),
            }) {ColorScheme = Colors.Menu};

            var win = new Window("Hintergrund-Prozessausführung Demo") {X = 0, Y = 1};
            top.Add(menuBar, win);

[hindermath]

When running looks like this...

[hindermath]

Sorry for the German language in a few parts of the program...