Update AssetSystem

Assets/YooAsset/Runtime/AssetSystem/Handles/SceneOperationHandle.cs

@@ -0,0 +1,138 @@
+using UnityEngine.SceneManagement;
+
+namespace YooAsset
+{
+	public class SceneOperationHandle : OperationHandleBase
+	{
+		private System.Action<SceneOperationHandle> _callback;
+
+		internal SceneOperationHandle(ProviderBase provider) : base(provider)
+		{
+		}
+		internal override void InvokeCallback()
+		{
+			if (IsValid)
+			{
+				_callback?.Invoke(this);
+			}
+		}
+
+		/// <summary>
+		/// 完成委托
+		/// </summary>
+		public event System.Action<SceneOperationHandle> Completed
+		{
+			add
+			{
+				if (IsValid == false)
+					throw new System.Exception($"{nameof(SceneOperationHandle)} is invalid");
+				if (_provider.IsDone)
+					value.Invoke(this);
+				else
+					_callback += value;
+			}
+			remove
+			{
+				if (IsValid == false)
+					throw new System.Exception($"{nameof(SceneOperationHandle)} is invalid");
+				_callback -= value;
+			}
+		}
+
+		/// <summary>
+		/// 场景对象
+		/// </summary>
+		public Scene SceneObject
+		{
+			get
+			{
+				if (IsValid == false)
+					return new Scene();
+				return _provider.SceneObject;
+			}
+		}
+
+		/// <summary>
+		/// 激活场景
+		/// </summary>
+		public bool ActivateScene()
+		{
+			if (IsValid == false)
+				return false;
+
+			if (SceneObject.IsValid() && SceneObject.isLoaded)
+			{
+				return SceneManager.SetActiveScene(SceneObject);
+			}
+			else
+			{
+				YooLogger.Warning($"Scene is invalid or not loaded : {SceneObject.name}");
+				return false;
+			}
+		}
+
+		/// <summary>
+		/// 异步卸载场景
+		/// </summary>
+		public UnloadSceneOperation UnloadAsync()
+		{
+			if (IsValid == false)
+			{
+				string error = $"{nameof(SceneOperationHandle)} is invalid.";
+				var operation = new UnloadSceneOperation(error);
+				OperationSystem.ProcessOperaiton(operation);
+				return operation;
+			}
+
+			ProviderBase provider = _provider;
+
+			// 释放场景句柄
+			ReleaseInternal();
+
+			// 卸载未被使用的资源（包括场景）
+			AssetSystem.UnloadUnusedAssets();
+
+			// 返回场景卸载异步操作类
+			if (provider.IsDestroyed == false)
+			{
+				YooLogger.Warning($"Scene can not unload. The provider not destroyed : {provider.AssetPath}");
+				var operation = new UnloadSceneOperation();
+				OperationSystem.ProcessOperaiton(operation);
+				return operation;
+			}
+			else
+			{
+				if (IsAdditiveScene(provider))
+				{
+					var operation = new UnloadSceneOperation(provider.SceneObject);
+					OperationSystem.ProcessOperaiton(operation);
+					return operation;
+				}
+				else
+				{
+					var operation = new UnloadSceneOperation();
+					OperationSystem.ProcessOperaiton(operation);
+					return operation;
+				}
+			}
+		}
+
+		private bool IsAdditiveScene(ProviderBase provider)
+		{
+			if (provider is DatabaseSceneProvider)
+			{
+				var temp = provider as DatabaseSceneProvider;
+				return temp.SceneMode == LoadSceneMode.Additive;
+			}
+			else if (provider is BundledSceneProvider)
+			{
+				var temp = provider as BundledSceneProvider;
+				return temp.SceneMode == LoadSceneMode.Additive;
+			}
+			else
+			{
+				throw new System.NotImplementedException();
+			}
+		}
+	}
+}