/// <summary>
/// Transition to supplied <paramref name="targetState" />.
/// </summary>
/// <param name="targetState">
/// Target state to transition the state machine to.
/// </param>
/// <returns>
/// <see langword="true" /> if a transition to a different state was performed
/// and the new state is not the exit state,
/// <see langword="false" /> if current state remains current.
/// </returns>
/// <remarks>
/// The method returns <see langword="false" /> when transitioning to the exit state
/// to prevent the state machine from looping directly over the enter state in the same
/// update tick to allow eventual parent state machines to move on to the next state.
/// </remarks>
private bool TransitionTo([NotNull] IState targetState)
{
if (targetState == _currentState)
{
return(false);
}
_currentState.Exit();
_currentState = targetState;
_currentState.Enter();
_currentTransitions = _transitions.TryGetValue(_currentState, out Transitions currentTransitions)
? currentTransitions
: ExitTransitions.Instance;
if (targetState != DefaultState.Exit)
{
return(true);
}
_completed = true;
return(false);
}
/// <summary>
/// Initializes a new instance of the <see cref="StateMachine"/> class.
/// </summary>
public StateMachine()
{
_anyTransitions = GetTransitions(DefaultState.Any);
_currentTransitions = GetTransitions(DefaultState.Enter);
AddTransition(DefaultState.Exit, DefaultState.Enter);
}
