StateManager

StateManager.cs

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


namespace StateManager {
    public class StateManager<T> {
        private T _state;
        public T state {
            get {
                return _state;
            }
            set {
                if (!_state.Equals(value)) {
                    SetState(value);
                }
            }
        }
        //Constructor
        public StateManager(T initialState)
        {
            _state = initialState;
        }

        Dictionary<StateEvent<T>, Action> actionMap = new Dictionary<StateEvent<T>, Action>();

        public void SetAction(T state, Transition transition, Action reactAction)
        {
            StateEvent<T> stateEvent = new StateEvent<T>(state, transition);
            if (actionMap.ContainsKey(stateEvent)) {
                actionMap[stateEvent] += reactAction;
            }
            else {
                actionMap.Add(stateEvent, reactAction);
            }
        }

        private void SetState(T setState)
        {
            if (!setState.Equals(_state)) {
                StateEvent<T> stateExit = new StateEvent<T>(_state, Transition.Exit);
                StateEvent<T> stateEnter = new StateEvent<T>(setState, Transition.Enter);
                if (actionMap.ContainsKey(stateExit)){
                    actionMap[stateExit]();
                }
                _state = setState;
                if (actionMap.ContainsKey(stateEnter)){
                    actionMap[stateEnter]();
                }
            }
        }
        private void ExecuteAction(StateEvent<T> stateChangeEvent)
        {
            actionMap[stateChangeEvent]();
        }


    }
    public enum Transition {
        Enter,
        Exit
    };

    public struct StateEvent<T> {
        T state;
        Transition transition;
        public StateEvent(T _state, Transition _transition)
        {
            state = _state;
            transition = _transition;
        }
    };

}