PIbd-33_Lisov_N.A_COP_30/CustomComponents/DropList.cs

namespace CustomComponents
{
    public partial class Frame : UserControl
    {

        private event EventHandler? _valueChanged;

        private string? SelectedValue = string.Empty;

        public event EventHandler ValueChanged
        {
            add
            {
                _valueChanged += value;
            }
            remove
            {
                _valueChanged -= value;
            }
        }

        public Frame()
        {
            InitializeComponent();
        }

        public void PopulateList(List<string> data)
        {
            if (data.Count == 0 || data is null)
            {
                return;
            }
            listBox.Items.AddRange(data.ToArray<object>());
        }

        public void Clear()
        {
            listBox.Items.Clear();
        }

        public string? Value
        {
            get
            {
                return SelectedValue;
            }
            set
            {
                SelectedValue = value;
            }
        }

        private void SelectedValue_Changed(object sender, EventArgs e)
        {
            var element = sender as ListBox;
            Value = element.Text.ToString();
            _valueChanged?.Invoke(this, e);
        }
    }
}