Hi,
I want to migrate a state machine from the old style to the new one. It has
guard states. The documentation says that guard states have been removed
and you should use internal events, like this:
<state name="start" startstate="true" >
<transition event_class="MousePressEvent" event_variant="AddPointClick"
target="start">
<action name="addPoint"/>
</transition>
<transition event_class="InternalEvent" event_variant="enoughPointsAdded"
target="final">
<action name="enoughPoints"/>
</transition>
</state>
and check the condition inside the 'addPoint' action and if it fulfils,
raise the internal event programmatically, like this:
InteractionPositionEvent* positionEvent = dynamic_cast<
InteractionPositionEvent*>(interactionEvent);
if (positionEvent != NULL)
{
...
if (...)
{
// create internal event that signal that the maximal number of points is
reached
InternalEvent::Pointer event = InternalEvent::New(NULL,this,
"enoughPointsAdded");
// add the internal event to the event queue of the Dispatcher
positionEvent->GetSender()->GetDispatcher()->QueueEvent(event.GetPointer());
}
However, in a recent version of MITK I see 'conditions', like this:
<state name="selected">
<transition event_class="MouseMoveEvent"
event_variant="CheckSelected" target="start">
<condition name="isoverpoint" inverted="true"/>
<action name="update"/>
<action name="unselectAll"/>
</transition>
which are connected like this:
// Condition which is evaluated before transition is taken
// following actions in the statemachine are only executed if it returns TRUE
CONNECT_CONDITION("isoverpoint", CheckSelection);
CONNECT_FUNCTION("addpoint", AddPoint);
...
But I have not found anything in the documentation about this. This
solution seems much simpler, though.
Are the conditions to replace the guard states? I do not need to bother
with internal events, right?
Cheers,
Miklos
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