MonoGame.Extended/Source/MonoGame.Extended.Gui/Controls/GuiControlCollection.cs

using System.Collections;
using System.Collections.Generic;

namespace MonoGame.Extended.Gui.Controls
{
    public class GuiControlCollection : IList<GuiControl>
    {
        private readonly GuiControl _parent;
        private readonly List<GuiControl> _list = new List<GuiControl>();

        public GuiControlCollection(GuiControl parent)
        {
            _parent = parent;
        }

        public IEnumerator<GuiControl> GetEnumerator()
        {
            return _list.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return ((IEnumerable)_list).GetEnumerator();
        }

        public void Add(GuiControl item)
        {
            item.Parent = _parent;
            _list.Add(item);
        }

        public void Clear()
        {
            foreach (var control in _list)
                control.Parent = null;

            _list.Clear();
        }

        public bool Contains(GuiControl item)
        {
            return _list.Contains(item);
        }

        public void CopyTo(GuiControl[] array, int arrayIndex)
        {
            _list.CopyTo(array, arrayIndex);
        }

        public bool Remove(GuiControl item)
        {
            item.Parent = null;
            return _list.Remove(item);
        }

        public int Count => _list.Count;
        public bool IsReadOnly { get; } = false;

        public int IndexOf(GuiControl item)
        {
            return _list.IndexOf(item);
        }

        public void Insert(int index, GuiControl item)
        {
            item.Parent = _parent;
            _list.Insert(index, item);
        }

        public void RemoveAt(int index)
        {
            _list.RemoveAt(index);
        }

        public GuiControl this[int index]
        {
            get { return _list[index]; }
            set { _list[index] = value; }
        }
    }
}