QStateMachine get事件导致状态转换

Question

I have created a QStateMachine and I have to get the Event which has caused a transition of the state. Isn't there any opportunity to get inside my slot EnterStateInit() the signal which caused this call. Here my sample code:

CreateStateMachine()
{
    QState *Init = new QState();
    QState *CheckPrecondition = new QState();
    QState *DoWork = new QState();

    Init->addTransition(this, SIGNAL(EventStart()), CheckPrecondition);
    CheckPrecondition->addTransition(this, SIGNAL(EventSuccesfulCondition()), DoWork);
    CheckPrecondition->addTransition(this, SIGNAL(EventNotSuccesfulCondition()), Init);
    DoWork->addTransition(this, SIGNAL(EventWorkDone()), Init);
    DoWork->addTransition(this, SIGNAL(EventError()), Init);

    connect(Init, SIGNAL(entered()), this, SLOT(EnterStateInit()));
    connect(CheckPrecondition, SIGNAL(entered()), this, SLOT(CheckPrecondition()));
    connect(DoWork, SIGNAL(entered()), this, SLOT(DoWork()));

    connect(Init, SIGNAL(exited()), this, SLOT(LeaveStateInit()));
    connect(CheckPrecondition, SIGNAL(exited()), this, SLOT(LeaveStateCheckPrecondition()));
    connect(DoWork, SIGNAL(exited()), this, SLOT(LeaveDoWork()));

    mModuleStateMachine.addState(Init);
    mModuleStateMachine.addState(CheckPrecondition);
    mModuleStateMachine.addState(DoWork);

    mModuleStateMachine.start();
}

EnterStateInit()
{
  /* Get Event which caused this SLOT to react */
  SetStatus();
}

Answer 1

A QState is-a QObject . You're free to reimplement its event() method :) To get an idea of what's going on:

void MyState::event(QEvent * event) {
  qDebug() << event;
  QState::event(event);
}