Програми для обліку

using Gtk;

class Program 
{
    static void Main()
    {        
        var app = Application.New("ua.org.accounting.test", Gio.ApplicationFlags.FlagsNone);

        app.OnActivate += (sender, args) =>
        {
            FirstWindow firstWindow = new(app);
            firstWindow.Show();
        };

        app.RunWithSynchronizationContext(null);
    }
}

using Gtk;
using static Gtk.Orientation;

class FirstWindow : Window
{
    public static void MarginAll(Box box) => box.MarginTop = box.MarginBottom = box.MarginStart = box.MarginEnd = 10;

    public FirstWindow(Application app) : base()
    {
        Application = app;
        Title = "Notebook";

        SetDefaultSize(500, 300);

        Box vBox = Box.New(Vertical, 0);
        MarginAll(vBox);
        Child = vBox;

        Notebook notebook = Notebook.New();
        notebook.Vexpand = true;

        // Page 1
        {
            Box vBoxPage = Box.New(Vertical, 10);
            MarginAll(vBoxPage);

            Box hBoxPage = Box.New(Horizontal, 10);
            hBoxPage.Append(Calendar.New());

            vBoxPage.Append(hBoxPage);

            notebook.AppendPage(vBoxPage, Label.New("Page 1"));
            notebook.SetTabReorderable(vBoxPage, true);
        }

        // Page 2
        {
            Box vBoxPage = Box.New(Vertical, 10);
            MarginAll(vBoxPage);

            for (int i = 1; i <= 15; i++)
            {
                Box hBoxPage = Box.New(Horizontal, 10);
                hBoxPage.Append(Label.New($"Label {i}"));

                vBoxPage.Append(hBoxPage);
            }

            ScrolledWindow scroll = ScrolledWindow.New();
            scroll.SetPolicy(PolicyType.Automatic, PolicyType.Automatic);
            scroll.Child = vBoxPage;

            notebook.AppendPage(scroll, Label.New("Page 2"));
            notebook.SetTabReorderable(scroll, true);
        }

        // Page 3
        {
            Box vBoxPage = Box.New(Vertical, 10);
            MarginAll(vBoxPage);

            for (int i = 1; i <= 15; i++)
            {
                Box hBoxPage = Box.New(Horizontal, 10);
                hBoxPage.Append(Button.NewWithLabel($"Button {i}"));

                vBoxPage.Append(hBoxPage);
            }

            ScrolledWindow scroll = ScrolledWindow.New();
            scroll.SetPolicy(PolicyType.Automatic, PolicyType.Automatic);
            scroll.Child = vBoxPage;

            notebook.AppendPage(scroll, Label.New("Page 3"));
            notebook.SetTabReorderable(scroll, true);
        }

        vBox.Append(notebook);
    }
}