ICEY/Assets/GameAssets/Games/icey/Scripts/StateMachine.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using UnityEngine;

public class StateMachine : BaseBehaviour
{
	//[DebuggerBrowsable(DebuggerBrowsableState.Never)]
	public event EventHandler<StateMachine.StateEventArgs> OnEnter;

	//[DebuggerBrowsable(DebuggerBrowsableState.Never)]
	public event EventHandler<StateMachine.StateEventArgs> OnExit;

	//[DebuggerBrowsable(DebuggerBrowsableState.Never)]
	public event EventHandler<StateMachine.StateEventArgs> StateUpdate;

	//[DebuggerBrowsable(DebuggerBrowsableState.Never)]
	public event EventHandler<StateMachine.TransferEventArgs> OnTransfer;

	public string currentState { get; private set; }

	private void Awake()
	{
		string.Intern("__Empty__");
		this.AddState("__Empty__");
		this.currentState = "__Empty__";
	}

	private void Update()
	{
		StateMachine.State state;
		if (!string.IsNullOrEmpty(this.currentState) && this.currentState != "__Empty__" && this.states.TryGetValue(this.currentState, out state))
		{
			this.OnTrigger(this.StateUpdate, state.name);
			this.OnTrigger(state.StateUpdate, state.name);
		}
	}

	public void AddStates(Type type)
	{
		this.AddStates(Enum.GetNames(type));
	}

	public StateMachine.State AddState(Enum state)
	{
		return this.AddState(state.ToString());
	}

	private StateMachine.State AddState(string name)
	{
		if (this.states.ContainsKey(name))
		{
			this.Info("在状态机中添加了同名方法" + name);
		}
		StateMachine.State state = new StateMachine.State
		{
			name = name
		};
		this.states[name] = state;
		return state;
	}

	public void AddStates(string[] names)
	{
		for (int i = 0; i < names.Length; i++)
		{
			this.AddState(names[i]);
		}
	}

	public StateMachine.State GetState(string name)
	{
		return this.states[name];
	}

	public StateMachine.State GetState(Enum name)
	{
		return this.GetState(name.ToString());
	}

	public void SetState(Enum nextState)
	{
		this.SetState(nextState.ToString());
	}

	public void SetState(string nextState)
	{
		this.Info(string.Format("当前状态为{0},准备转换状态为{1}", this.currentState, nextState));
		if (this.currentState == "__Empty__")
		{
			this.OnTrigger(this.states[nextState].OnEnter, this.states[nextState].name);
			this.OnTrigger(this.OnEnter, this.states[nextState].name);
			this.currentState = nextState;
			return;
		}
		this.OnTrigger(this.states[this.currentState].OnExit, this.states[this.currentState].name);
		this.OnTrigger(this.OnExit, this.states[this.currentState].name);
		this.OnTrigger(this.OnTransfer, this.currentState, nextState);
		try
		{
			this.OnTrigger(this.states[nextState].OnEnter, this.states[nextState].name);
		}
		catch (KeyNotFoundException)
		{
			Log.Error(nextState);
			throw;
		}
		this.OnTrigger(this.OnEnter, this.states[nextState].name);
		this.currentState = nextState;
	}

	public void SetStateDelay(Enum nextState, float time)
	{
		this._nextState = nextState;
		base.StartCoroutine(this.SetStateDelayCoroutine(time));
	}

	private IEnumerator SetStateDelayCoroutine(float time)
	{
		yield return new WaitForSeconds(time);
		this.SetState(this._nextState);
		yield break;
	}

	private void OnTrigger(EventHandler<StateMachine.StateEventArgs> handler, string lastState)
	{
		if (handler != null)
		{
			StateMachine.StateEventArgs e = new StateMachine.StateEventArgs(lastState);
			handler(this, e);
		}
	}

	private void OnTrigger(EventHandler<StateMachine.TransferEventArgs> handler, string lastState, string nextState)
	{
		if (handler != null)
		{
			StateMachine.TransferEventArgs e = new StateMachine.TransferEventArgs(lastState, nextState);
			handler(this, e);
		}
	}

	private void Info(object obj)
	{
		if (this._logLevel <= Log.LogLevel.Info)
		{
			Log.Info(obj);
		}
	}

	public Dictionary<string, StateMachine.State> states = new Dictionary<string, StateMachine.State>();

	private const string EmptyState = "__Empty__";

	private Enum _nextState;

	private Log.LogLevel _logLevel = Log.LogLevel.Warning;

	public class State
	{
     
        public EventHandler<StateMachine.StateEventArgs> OnEnter;

     
        public EventHandler<StateMachine.StateEventArgs> OnExit;

     
        public EventHandler<StateMachine.StateEventArgs> StateUpdate;

      
        public string name;
    }

	public class TransferEventArgs : EventArgs
	{
		public TransferEventArgs(string lastState, string nextState)
		{
			this.lastState = lastState;
			this.nextState = nextState;
		}

		public readonly string lastState;

		public readonly string nextState;
	}

	public class StateEventArgs : EventArgs
	{
		public StateEventArgs(string state)
		{
			this.state = state;
		}

		public readonly string state;
	}
}