using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ComponentProgramming
{
    public partial class UserCheckedListBox : UserControl
    {
        private EventHandler _changeEvent;
        public string SelectedElement
        {
            get
            {
                return checkedListBox.SelectedItem?.ToString() ?? string.Empty;
            }
            set
            {
                if (checkedListBox.Items.Contains(value))
                {
                    checkedListBox.SelectedItem = value;
                }
            }
        }

        public event EventHandler ChangeEvent
        {
            add
            {
                _changeEvent += value;
            }
            remove
            {
                _changeEvent -= value;
            }

        }
        public void Clear()
        {
            checkedListBox.Items.Clear();
        }
        public void AddToList(string Value)
        {
            if (Value == null)
            {
                return;
            }
            checkedListBox.Items.Add(Value);
        }
        public UserCheckedListBox()
        {
            InitializeComponent();
        }

        private void checkedListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (checkedListBox.CheckedItems.Count > 1)
            {
                foreach (int index in checkedListBox.CheckedIndices)
                {
                    if (index != checkedListBox.SelectedIndex)
                    {
                        checkedListBox.SetItemChecked(index, false);
                    }
                }

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