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69 行
1.9 KiB
69 行
1.9 KiB
using System.Collections.Generic;
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using Unity.Entities;
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using Unity.Sample.Core;
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/// <summary>
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/// Light weight state machine
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/// </summary>
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/// <typeparam name="T"></typeparam>
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class StateMachine<T>
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{
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public delegate void StateFunc();
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public void Add(T id, StateFunc enter, StateFunc update, StateFunc leave)
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{
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m_States.Add(id, new State(id, enter, update, leave));
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}
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public T CurrentState()
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{
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return m_CurrentState.Id;
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}
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public void Update()
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{
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m_CurrentState.Update();
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}
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public void Shutdown()
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{
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if (m_CurrentState != null && m_CurrentState.Leave != null)
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m_CurrentState.Leave();
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m_CurrentState = null;
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}
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public void SwitchTo(World world,T state)
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{
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GameDebug.Assert(m_States.ContainsKey(state), "Trying to switch to unknown state " + state.ToString());
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GameDebug.Assert(m_CurrentState == null || !m_CurrentState.Id.Equals(state), "Trying to switch to " + state.ToString() + " but that is already current state");
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var newState = m_States[state];
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GameDebug.Log(world, null, "Switching state: " + (m_CurrentState != null ? m_CurrentState.Id.ToString() : "null") + " -> " + state.ToString());
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if (m_CurrentState != null && m_CurrentState.Leave != null)
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m_CurrentState.Leave();
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if (newState.Enter != null)
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newState.Enter();
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m_CurrentState = newState;
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}
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class State
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{
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public State(T id, StateFunc enter, StateFunc update, StateFunc leave)
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{
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Id = id;
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Enter = enter;
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Update = update;
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Leave = leave;
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}
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public T Id;
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public StateFunc Enter;
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public StateFunc Update;
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public StateFunc Leave;
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}
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State m_CurrentState = null;
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Dictionary<T, State> m_States = new Dictionary<T, State>();
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}
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