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

using Components.Exceptions;
using System.Windows.Forms;

namespace Components
{
    public enum Types : int
    {
        Exception = 0,
        DeleteFirst = 1,

    }


    public partial class UserControlCheckedList : UserControl
    {
        public int MaxCheckedItemsCount { get; set; } = 1;
        private Types typeOfMaxChecked = Types.DeleteFirst;
        private EventHandler _onCheckedItemChangedEvent;
        public void ChangeTypeOfMaxChecked(Types type)
        {
            typeOfMaxChecked = type;
        }
        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 List<string> CheckedItemss
        {
            get
            {
                List<string> list = new List<string>();
                foreach (var item in checkedListBox.CheckedItems)
                {
                    list.Add(item.ToString());
                }
                return list;
            }
            set
            {
                foreach (var item in value)
                {
                    if (checkedListBox.Items.Contains(item))
                    {
                        checkedListBox.SetItemCheckState(checkedListBox.Items.IndexOf(item), 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();
        }
        private void checkedListBox_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            this.BeginInvoke((MethodInvoker)(
            () =>
            {
                if (checkedListBox.CheckedItems.Count > MaxCheckedItemsCount)
                {
                    if (typeOfMaxChecked == Types.Exception)
                    {
                        MessageBox.Show("Превышено максимальное число выбранных элементов");
                        checkedListBox.SetItemChecked(e.Index, false);
                    }
                    else if (typeOfMaxChecked == Types.DeleteFirst)
                    {
                        checkedListBox.SetItemCheckState(checkedListBox.Items.IndexOf(CheckedItem), CheckState.Unchecked);
                    }

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