PIbd-31_PotapovNS_COP_20/WinFormSolution/Components/UserControlCheckedList.cs

namespace Components
{
    public partial class UserControlCheckedList : UserControl
    {
        private List<int> _lastCheckedIndexes = new List<int>();
        public int MaxCheckedItemsCount { get; set; } = 1;
        private EventHandler _onCheckedItemChangedEvent;
        public event EventHandler CheckedItemChanged
        {
            add
            {
                _onCheckedItemChangedEvent += value;
            }
            remove
            {
                _onCheckedItemChangedEvent -= value;
            }
        }
        public string CheckedItem
        {
            get
            {
                return checkedListBox.CheckedItems[0] as string ?? string.Empty;
            }
            set
            {
                if (checkedListBox.Items.Contains(value))
                {
                    checkedListBox.SetItemCheckState(checkedListBox.Items.IndexOf(value), CheckState.Checked);
                }
            }
        }
        public UserControlCheckedList()
        {
            InitializeComponent();
        }
        public void SetCheckedListBoxValues(List<string> values)
        {
            ClearCheckedListBoxValues();
            foreach (var item in values)
            {
                checkedListBox.Items.Add(item);
            }
        }
        public void ClearCheckedListBoxValues()
        {
            checkedListBox.Items.Clear();
            _lastCheckedIndexes.Clear();
        }
        private void checkedListBox_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            if (e.NewValue == CheckState.Checked)
            {
                _lastCheckedIndexes.Add(e.Index);

                while (_lastCheckedIndexes.Count > MaxCheckedItemsCount)
                {
                    checkedListBox.SetItemCheckState(_lastCheckedIndexes[0], CheckState.Unchecked);
                }
            }
            else if (e.NewValue == CheckState.Unchecked)
            {
                _lastCheckedIndexes.Remove(e.Index);
            }

            _onCheckedItemChangedEvent?.Invoke(sender, e);
        }
    }
}