TEngine/UnityProject/Assets/TEngine/Runtime/Modules/UIModule/OpenWindowOperation.cs

using YooAsset;

namespace TEngine
{
    /// <summary>
    /// 打开窗口操作句柄。
    /// </summary>
    public class OpenWindowOperation : GameAsyncOperation
    {
        private enum ESteps
        {
            None,
            Waiting,
            Done,
        }

        private readonly AssetOperationHandle _handle;
        private ESteps _steps = ESteps.None;
		public UIWindow Window { get; private set; }
        
        internal OpenWindowOperation(UIWindow uiWindow)
        {
            if (uiWindow == null)
            {
                throw new GameFrameworkException($"OpenWindowOperation .ctor uiWindow is null.");
            }
            _handle = uiWindow.Handle;
            Window = uiWindow;
        }
        protected override void OnStart()
        {
            _steps = ESteps.Waiting;
        }
        protected override void OnUpdate()
        {
            if (_steps == ESteps.None || _steps == ESteps.Done)
                return;

            if (_handle == null)
            {
                _steps = ESteps.Done;
                Status = EOperationStatus.Succeed;
                return;
            }

            if (_steps == ESteps.Waiting)
            {
                if (_handle.IsValid == false)
                {
                    _steps = ESteps.Done;
                    Status = EOperationStatus.Failed;
                    Error = $"{nameof(AssetOperationHandle)} is invalid.";
                    return;
                }

                if (_handle.IsDone == false)
                    return;

                if (_handle.AssetObject == null)
                {
                    _steps = ESteps.Done;
                    Status = EOperationStatus.Failed;
                    Error = $"{nameof(AssetOperationHandle.AssetObject)} is null.";
                    return;
                }

                _steps = ESteps.Done;
                Status = EOperationStatus.Succeed;
            }
        }

        /// <summary>
        /// 等待异步实例化结束
        /// </summary>
        public void WaitForAsyncComplete()
        {
            if (_handle != null)
            {
                if (_steps == ESteps.Done)
                    return;
                _handle.WaitForAsyncComplete();
                OnUpdate();
            }
        }
    }
}