Issue with parallel states and parent transitions
I have run into an issue with parallel states and parent transitions.
Take the state machine below. It is an extension of the basic string match example where a state will transition if an event with a matching string is posted to the state machine. In the below example, if I post a string of "testSuper" the state machine will transition to "Sub State 3". However, if I remove subState3 and change subStateTransition to not have a target state, then posting a message with string "testSuper" will result in the machine going into the "Fault State". Essentially, I am seeing behavior where both a sub state's transition and a super state's transition onTransition method is being called when a sub state's transition in a parallel state has no target state. However, if there is a target state then only the sub state's transition onTransition is called.
Is this expected behavior?
QNamedState* superState = new QNamedState("Super State", nullptr); QState* parallelState = new QState(QStateMachine::ParallelStates, superState); QState* parallel1 = new QState(parallelState); QState* parallel2 = new QState(parallelState); QNamedState* subState1 = new QNamedState("Sub State 1", parallel1); QNamedState* subState2 = new QNamedState("Sub State 2", parallel2); QNamedState* subState3 = new QNamedState("Sub State 3", parallel1); parallel1->setInitialState(subState1); parallel2->setInitialState(subState2); QNamedState* faultState = new QNamedState("Fault State", nullptr); QNamedStateTransition* faultStateTransition = new QNamedStateTransition("testSuper", "Super transition"); faultStateTransition->setTargetState(faultState); superState->addTransition(faultStateTransition); //Below will transition into "Sub State 3" QNamedStateTransition* subStateTransition = new QNamedStateTransition("testSuper", "Base transition"); subStateTransition->setTargetState(subState3); subState1->addTransition(subStateTransition); /* This code will transition into "Fault State" QNamedStateTransition* subStateTransition = new QNamedStateTransition("testSuper", "Base transition"); subState1->addTransition(subStateTransition); */ QNamedStateTransition* bogusTransition = new QNamedStateTransition("bogusTest", "Bogus Transition"); subState2->addTransition(bogusTransition); stateMachine.addState(superState); stateMachine.addState(faultState); stateMachine.setInitialState(superState); superState->setInitialState(parallelState); stateMachine.start();