fix(state): 修改状态机切换方法返回值类型并改进转换失败处理

- 将ChangeTo方法返回值从void改为bool类型
- 添加转换失败时返回false的逻辑
- 在状态转换被拒绝时调用OnTransitionRejected回调
- 更新接口定义以匹配新的返回值类型
- 修改单元测试以验证转换失败时的返回值
- [skip ci]

GFramework.Core.Abstractions/state/IStateMachine.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace GFramework.Core.Abstractions.state;
@@ -36,7 +36,8 @@ public interface IStateMachine
     /// 切换到指定类型的状态
     /// </summary>
     /// <typeparam name="T">要切换到的状态类型，必须实现IState接口</typeparam>
-    void ChangeTo<T>() where T : IState;
+    /// <returns>如果成功切换则返回true，否则返回false</returns>
+    bool ChangeTo<T>() where T : IState;
 
     /// <summary>
     /// 检查指定类型的状态是否已注册

GFramework.Core.Tests/state/StateMachineTests.cs

@@ -186,8 +186,9 @@ public class StateMachineTests
         _stateMachine.ChangeTo<TestStateV2>();
 
         var oldState = _stateMachine.Current;
-        _stateMachine.ChangeTo<TestStateV3>();
+        var result = _stateMachine.ChangeTo<TestStateV3>();
 
+        Assert.That(result, Is.False);
         Assert.That(_stateMachine.Current, Is.SameAs(oldState));
         Assert.That(_stateMachine.Current, Is.SameAs(state1));
         Assert.That(state2.EnterCalled, Is.False);

GFramework.Core/state/StateMachine.cs

@@ -1,4 +1,4 @@
-using GFramework.Core.Abstractions.state;
+using GFramework.Core.Abstractions.state;
 
 namespace GFramework.Core.state;
 
@@ -79,8 +79,9 @@ public class StateMachine(int maxHistorySize = 10) : IStateMachine
     /// 切换到指定类型的状态
     /// </summary>
     /// <typeparam name="T">目标状态类型</typeparam>
+    /// <returns>如果成功切换则返回true，否则返回false</returns>
     /// <exception cref="InvalidOperationException">当目标状态未注册时抛出</exception>
-    public void ChangeTo<T>() where T : IState
+    public bool ChangeTo<T>() where T : IState
     {
         lock (_lock)
         {
@@ -90,10 +91,13 @@ public class StateMachine(int maxHistorySize = 10) : IStateMachine
 
             // 验证当前状态是否可以转换到目标状态
             if (Current != null && !Current.CanTransitionTo(target))
-                throw new InvalidOperationException(
+            {
-                    $"Cannot transition from {Current.GetType().Name} to {typeof(T).Name}");
+                OnTransitionRejected(Current, target);
+                return false;
+            }
 
             ChangeInternal(target);
+            return true;
         }
     }