private void StartStateMachineInternal()
{
var state = GetState(StartState);
if (AssociatedVisualStateManager != null)
{
AssociatedVisualStateManager.TransitionState(Name, null, StartState.ToString());
}
state.Enter(StartState);
CurrentState = StartState;
if (!state.TryAutomaticTransition())
{
state.ResumeTransitions();
}
RaiseStateMachineStarted();
}
internal void TransitionStateInternal <TTrigger>(T fromState, T toState, TTrigger trigger, Action <TTrigger> transitionAction)
{
//we have to check, that the same event may only come in once. this solves an issue with the tracking mechanism
if (trigger is EventArgs)
{
if (trigger.Equals(_lastTrigger))
{
_lastTrigger = trigger;
return;
}
_lastTrigger = trigger;
}
TransitionOverride(fromState, toState, trigger);
if (!CurrentState.Equals(fromState))
{
return;
}
var isInternalTransition = fromState.Equals(toState);
Task <bool> vsmTransition = null;
if (!isInternalTransition && AssociatedVisualStateManager != null)
{
vsmTransition = AssociatedVisualStateManager.TransitionState(Name, fromState.ToString(), toState.ToString());
}
var currentState = GetState(fromState);
var futureState = GetState(toState);
//exit the current state
if (!isInternalTransition)
{
currentState.IgnoreTransitions();
currentState.Exit(toState);
}
//call the transition action
if (transitionAction != null)
{
Action safeAction = () =>
{
try
{
transitionAction(trigger);
}
catch (Exception e)
{
RaiseStateMachineException(e);
}
};
if (CurrentDispatcher != null)
{
CurrentDispatcher.Invoke(safeAction, null);
}
else
{
safeAction();
}
}
//enter the next state
if (!isInternalTransition)
{
futureState.Enter(fromState);
futureState.ResumeTransitions();
CurrentState = toState;
RaiseStateChanged(fromState, toState);
}
//we can only make automatic transitions if we entered the current state from somewhere else
if (!isInternalTransition)
{
if (vsmTransition == null || vsmTransition.IsCompleted)
{
futureState.TryAutomaticTransition();
}
else
{
vsmTransition.ContinueWith(result => futureState.TryAutomaticTransition());
}
}
}
