Summary

StateMachines run one state at a time, allow for easy switchiung of states and controlled behaviour

Events

OnStateChanged<StateMachine<StateType, ContextType>>

Example usage

MovementState.cs

using UnityEngine;

// Create a base type for the state machine, all states inherit from this class
public abstract class MovementState : State<Player> 
{
    // virtual utility method for movement behaviour
    public virtual void OnMove(Vector2 InputDirection) { }
}

DefaultMovementState.cs

// Create a default state for the state machine
public class DefaultMovementState : MovementState 
{
    // Change the behaviour when moving
    public override void OnMove(Vector2 InputDirection)
    {
        transform.position += new Vector3(InputDirection.x, 0, InputDirection.y) * Time.deltaTime;
    }
}

Player.cs

using UnityEngine;

// Create a player class
public class Player : MonoBehaviour
{
    // Create a new statemachine for MovementState, inherited from State<Player> 
    StateMachine<MovementState, Player> _movement = new StateMachine<MovementState, Player>();

    private void Start()
    {
        // Default to the default movement state
        _movement.SwitchState<DefaultMovementState>(this);
    }

    private void Update()
    {
        // Call the method of the active state, not of the inactive states. 
        _movement.state.OnMove(Input.MovementDirection);
    }
}