/// <summary>
/// Starts running this region.
/// </summary>
public void Start(string trigger = null)
{
Debug.WriteLine("Start region '{0}' from state '{1}' by trigger '{2}'.", Name, ActiveVertex.GetType().Name, trigger);
if (ActiveVertex is InitialState)
{
var next = ActiveVertex.MoveNext(null);
if (ActiveVertex != next)
{
var currentVertex = ActiveVertex;
ActiveVertex = next;
OnTravelled(new TravelledEventArgs(null, currentVertex, next));
ActiveVertex.OnActive(null);
}
}
else
{
// Saved history state
OnTravelled(new TravelledEventArgs(trigger, Vertices[0], ActiveVertex));
ActiveVertex.OnEntry();
ActiveVertex.OnActive(trigger);
}
}
/// <summary>
/// Stops this region.
/// </summary>
public void Stop()
{
Debug.WriteLine("Stop region '{0}'.", Name);
ActiveVertex.OnExit();
if (!HasHistory)
{
Debug.WriteLine("Region '{0}' has no history. Set active vertex to initial state again.", Name);
ActiveVertex = Vertices[0];
}
else
{
Debug.WriteLine("Region '{0}' has history. Save vertex '{1}' as history state.", Name, ActiveVertex.GetType().Name);
}
}
/// <summary>
/// Moves the next vertex in this region by the specified trigger.
/// </summary>
public IVertex MoveNext(string trigger)
{
var next = ActiveVertex.MoveNext(trigger);
// No child of this region can handle the event
if (next == null)
{
return(null);
}
if (ActiveVertex != next)
{
var currentVertex = ActiveVertex;
ActiveVertex = next;
OnTravelled(new TravelledEventArgs(trigger, currentVertex, next));
ActiveVertex.OnActive(trigger);
}
return(ActiveVertex);
}
