Програми для обліку

using Gtk;

class Program
{
    public static void Main()
    {
        Application.Init();
        new FirstWindow();
        Application.Run();
    }

    public static void Quit()
    {
        Application.Quit();
    }
}

using Gtk;

class FirstWindow : Window
{
    ListBox listBox = new ListBox() { SelectionMode = SelectionMode.Single };
    ScrolledWindow scroll;

    public FirstWindow() : base("Test")
    {
        SetDefaultSize(600, 350);
        SetPosition(WindowPosition.Center);

        DeleteEvent += delegate { Program.Quit(); };

        VBox vBox = new VBox();
        Add(vBox);

        listBox.ButtonPressEvent += OnListBoxButtonPress;

        //Button
        {
            HBox hBox = new HBox();
            vBox.PackStart(hBox, false, false, 5);

            Button buttonAdd = new Button("Додати");
            buttonAdd.Clicked += OnAddClick;
            hBox.PackStart(buttonAdd, false, false, 5);

            Button buttonClear = new Button("Очистити");
            buttonClear.Clicked += OnClearClick;
            hBox.PackStart(buttonClear, false, false, 5);
        }

        //ListBox
        {
            HBox hBox = new HBox();
            vBox.PackStart(hBox, false, false, 5);

            scroll = new ScrolledWindow() { ShadowType = ShadowType.In, HeightRequest = 300, WidthRequest = 600 };
            scroll.SetPolicy(PolicyType.Automatic, PolicyType.Automatic);
            scroll.Add(listBox);

            hBox.PackStart(scroll, false, false, 5);
        }

        ShowAll();
    }

    void OnAddClick(object? sender, EventArgs args)
    {
        ListBoxRow row = [new Label($"{DateTime.Now.ToString("HH:mm:ss")} - text") { Halign = Align.Start }];
        listBox.Add(row);
        listBox.SelectRow(row);
        listBox.ShowAll();

        scroll.Vadjustment.Value = scroll.Vadjustment.Upper;
    }

    void OnClearClick(object? sender, EventArgs args)
    {
        foreach (Widget item in listBox.Children)
            listBox.Remove(item);
    }

    void OnListBoxButtonPress(object? sender, ButtonPressEventArgs args)
    {
        if (args.Event.Type == Gdk.EventType.DoubleButtonPress)
        {
            ListBoxRow[] selectedRows = listBox.SelectedRows;
            if (selectedRows.Length != 0)
                Console.WriteLine(((Label)selectedRows[0].Child).Text);
        }
    }
}