using System.Collections; using System.Collections.Generic; namespace Unity.UIWidgets.foundation { public class ObserverList : ICollection { public readonly List _list = new List(); public bool _isDirty = false; public HashSet _set = null; IEnumerator IEnumerable.GetEnumerator() { return this.GetEnumerator(); } public IEnumerator GetEnumerator() { return this._list.GetEnumerator(); } public void Add(T item) { this._isDirty = true; this._list.Add(item); } public void Clear() { this._isDirty = true; this._list.Clear(); } public bool Contains(T item) { if (this._list.Count < 3) { return this._list.Contains(item); } if (this._isDirty) { if (this._set == null) { this._set = new HashSet(this._list); } else { this._set.Clear(); this._set.UnionWith(this._list); } this._isDirty = false; } return this._set.Contains(item); } public void CopyTo(T[] array, int arrayIndex) { this._list.CopyTo(array, arrayIndex); } public bool Remove(T item) { this._isDirty = true; return this._list.Remove(item); } public int Count { get { return this._list.Count; } } public bool IsReadOnly { get { return false; } } } }