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
{
    Label labelInputText = new Label();

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

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

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

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

        Button button = new Button("Відкрити діалогове вікно");
        button.Clicked += OnOpenWindowDialog;
        hBox.PackStart(button, false, false, 5);

        HBox hBoxLabel = new HBox();
        vBox.PackStart(hBoxLabel, false, false, 5);
        hBoxLabel.PackStart(labelInputText, false, false, 5);

        ShowAll();
    }

    void OnOpenWindowDialog(object? sender, EventArgs args)
    {
        string InputText = "";

        ResponseType ModalResult = ResponseType.None;
        using (FormInput windowFormInput = new FormInput())
        {
            windowFormInput.TransientFor = this;
            windowFormInput.Modal = true;
            windowFormInput.Title = "Введіть опис";
            windowFormInput.Resizable = false;
            windowFormInput.CallBack_ResultInputText = (string x) => { InputText = x; };
            windowFormInput.Show();

            while (ModalResult == ResponseType.None)
            {
                ModalResult = windowFormInput.ModalResult;
                Application.RunIteration(true);
            }
        }

        labelInputText.Text = InputText;
    }
}

using Gtk;

class FormInput : Window
{
    public ResponseType ModalResult { get; set; } = ResponseType.None;

    Button bOk = new Button("Ok");
    Button bCancel = new Button("Закрити");
    TextView InputText = new TextView() { WrapMode = WrapMode.Word };
    public System.Action<string>? CallBack_ResultInputText { get; set; }

    public FormInput() : base("Введення тексту")
    {
        SetPosition(WindowPosition.Center);

        DeleteEvent += delegate { OnCancel(bCancel, new EventArgs()); };
        BorderWidth = 5;

        ScrolledWindow scrollTextView = new ScrolledWindow() { ShadowType = ShadowType.In, WidthRequest = 400, HeightRequest = 100 };
        scrollTextView.SetPolicy(PolicyType.Automatic, PolicyType.Automatic);
        scrollTextView.Add(InputText);

        VBox vBox = new VBox(false, 0);
        vBox.PackStart(scrollTextView, false, false, 0);

        bOk.Clicked += OnOk;
        bCancel.Clicked += OnCancel;

        HBox hBoxButton = new HBox();
        hBoxButton.PackStart(bOk, false, false, 5);
        hBoxButton.PackStart(bCancel, false, false, 5);
        vBox.PackStart(hBoxButton, false, false, 5);

        Add(vBox);
        ShowAll();
    }

    void OnOk(object? sender, EventArgs args)
    {
        ModalResult = ResponseType.Ok;
        CallBack_ResultInputText?.Invoke(InputText.Buffer.Text);
        ThisClose();
    }

    void OnCancel(object? sender, EventArgs args)
    {
        ModalResult = ResponseType.Cancel;
        ThisClose();
    }

    void ThisClose()
    {
        this.Hide();
        this.Dispose();
        this.Destroy();
    }
}