using System.Collections;

namespace System.Windows.Forms
{
    public partial class ListView
    {
        public class ColumnHeaderCollection : CollectionBase
        {
            private ListView owner;

            public ColumnHeader this[int index] => InnerList[index] as ColumnHeader;

            public void Add(ColumnHeader column)
            {
                column.SetOwner(owner);
                column.SetBinding(InnerList.Count);
                InnerList.Add(column);
                owner.GridView.Columns.Add(column.column);
            }

            public void Add(string text) => Add(new ColumnHeader() { Text = text });

            public void AddRange(ColumnHeader[] items)
            {
                foreach (var item in items)
                    Add(item);
            }

            public void Remove(ColumnHeader column)
            {
                InnerList.Remove(column);
                owner.GridView.Columns.Remove(column.column);
            }

            public new void RemoveAt(int index)
            {
                InnerList.RemoveAt(index);
                owner.GridView.Columns.RemoveAt(index);
            }

            public new void Clear()
            {
                InnerList.Clear();
                owner.GridView.Columns.Clear();
            }

            public int IndexOf(ColumnHeader column) => InnerList.IndexOf(column);

            internal ColumnHeaderCollection(ListView owner)
            {
                this.owner = owner;
            }
        }
    }
}