internal Transition UpdateTransitions(StateEventArgs eventArgs)
{
Transition firingTransition = null;
// Update sub-state transitions first.
if (_parallelSubStates != null)
{
foreach (var stateCollection in _parallelSubStates)
{
firingTransition = stateCollection.UpdateTransitions(eventArgs);
if (firingTransition != null && !stateCollection.ContainsRecursive(firingTransition.TargetState))
{
// The transition target is outside the sub-state collection.
// More parallel transition updates are only allowed for internal transitions.
break;
}
// There was no transition or the transition was an internal transition.
// We can check the next parallel state set.
}
}
// Abort if a transition was performed.
if (firingTransition != null)
{
return(firingTransition);
}
// Check transitions of this state.
foreach (var transition in Transitions)
{
if (transition.TargetState == null)
{
throw new InvalidOperationException("TargetState of transition must not be null.");
}
//if (transition.TargetState.StateMachine != StateMachine)
// throw new InvalidOperationException("TargetState of transition must not belong to different state machine.");
// Check transition.
bool fired = transition.Update(eventArgs.DeltaTime);
if (fired)
{
// Get state collection that contains this state and the target state.
var stateCollection = StateCollection.GetCollection(this, transition.TargetState);
// Exit states.
stateCollection.ExitState(transition, eventArgs);
// Execute transition action.
transition.OnAction(eventArgs);
// Enter states.
stateCollection.EnterState(transition, eventArgs);
// Do not update other transitions after first transition has fired.
return(transition);
}
}
return(null);
}
//--------------------------------------------------------------
#region Creation & Cleanup
//--------------------------------------------------------------
/// <summary>
/// Initializes a new instance of the <see cref="StateMachine"/> class.
/// </summary>
public StateMachine()
{
States = new StateCollection();
//States.StateMachine = this;
}