更新Demo

更新Demo

UnityProject/Packages/YooAsset/Runtime/OperationSystem/AsyncOperationBase.cs

@@ -0,0 +1,110 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace YooAsset
+{
+	public abstract class AsyncOperationBase : IEnumerator
+	{
+		// 用户请求的回调
+		private Action<AsyncOperationBase> _callback;
+
+		/// <summary>
+		/// 状态
+		/// </summary>
+		public EOperationStatus Status { get; protected set; } = EOperationStatus.None;
+
+		/// <summary>
+		/// 错误信息
+		/// </summary>
+		public string Error { get; protected set; }
+
+		/// <summary>
+		/// 处理进度
+		/// </summary>
+		public float Progress { get; protected set; }
+
+		/// <summary>
+		/// 是否已经完成
+		/// </summary>
+		public bool IsDone
+		{
+			get
+			{
+				return Status == EOperationStatus.Failed || Status == EOperationStatus.Succeed;
+			}
+		}
+
+		/// <summary>
+		/// 完成事件
+		/// </summary>
+		public event Action<AsyncOperationBase> Completed
+		{
+			add
+			{
+				if (IsDone)
+					value.Invoke(this);
+				else
+					_callback += value;
+			}
+			remove
+			{
+				_callback -= value;
+			}
+		}
+
+		/// <summary>
+		/// 异步操作任务
+		/// </summary>
+		public Task Task
+		{
+			get
+			{
+				if (_taskCompletionSource == null)
+				{
+					_taskCompletionSource = new TaskCompletionSource<object>();
+					if (IsDone)
+						_taskCompletionSource.SetResult(null);
+				}
+				return _taskCompletionSource.Task;
+			}
+		}
+
+		internal abstract void Start();
+		internal abstract void Update();
+
+		internal void SetFinish()
+		{
+			Progress = 1f;
+			_callback?.Invoke(this); //注意：如果完成回调内发生异常，会导致Task无限期等待
+			if (_taskCompletionSource != null)
+				_taskCompletionSource.TrySetResult(null);
+		}
+		internal void SetStart()
+		{
+			Status = EOperationStatus.Processing;
+		}
+
+		/// <summary>
+		/// 清空完成回调
+		/// </summary>
+		protected void ClearCompletedCallback()
+		{
+			_callback = null;
+		}
+
+		#region 异步编程相关
+		bool IEnumerator.MoveNext()
+		{
+			return !IsDone;
+		}
+		void IEnumerator.Reset()
+		{
+		}
+		object IEnumerator.Current => null;
+
+		private TaskCompletionSource<object> _taskCompletionSource;
+		#endregion
+	}
+}