46 lines
1.6 KiB
C#
46 lines
1.6 KiB
C#
using System.Collections.Generic;
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using System.Linq;
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using UnityEngine;
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using BaseGames.Core.Events;
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namespace BaseGames.Core
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{
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/// <summary>
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/// 状态机核心，持有状态注册表与当前状态。
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/// GameManager 持有一个实例；状态对象在 Awake 注入。
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/// </summary>
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public class GameStateMachine
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{
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private readonly Dictionary<GameStateId, IGameState> _states = new();
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private IGameState _current;
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public GameStateId CurrentStateId => _current?.Id ?? default;
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/// <summary>注册状态实现（同 Id 注册多次以最后一次为准）。</summary>
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public void Register(IGameState state) => _states[state.Id] = state;
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/// <summary>转换到目标状态。失败时返回 false 并填充 error 字符串。</summary>
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public bool TransitionTo(GameStateId nextId, out string error)
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{
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if (!_states.TryGetValue(nextId, out var next))
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{
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error = $"[GameStateMachine] 未知状态 '{nextId}'";
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return false;
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}
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if (_current != null && !_current.ValidNextStates.Contains(nextId))
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{
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error = $"[GameStateMachine] 非法转换 {_current.Id} → {nextId}";
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return false;
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}
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var prev = _current?.Id ?? default;
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_current?.OnExit(nextId);
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_current = next;
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_current.OnEnter(prev);
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error = null;
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return true;
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}
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public void Tick(float deltaTime) => _current?.Tick(deltaTime);
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}
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}
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