txt_ = new QLineEdit(this);
lbl_ = new QLabel("Enter a message...", this);

QVBoxLayout *vBoxLayout = new QVBoxLayout;
vBoxLayout->addSpacing(lbl_->height());
vBoxLayout->addWidget(txt_);
setLayout(vBoxLayout);

QStateMachine *sm = new QStateMachine;

QState *stateFocusedOut = new QState(sm);
QRect rect1(250, 250, 100, 30);
stateFocusedOut->assignProperty(lbl_, "geometry", rect1);
sm->setInitialState(stateFocusedOut);

QState *stateFocusedIn = new QState(sm);
QRect rect2(0, 0, 100, 30);
stateFocusedIn->assignProperty(lbl_, "geometry", rect2);

QEventTransition *trans1 = new QEventTransition(txt_, QEvent::FocusIn, stateFocusedIn);
stateFocusedOut->addTransition(trans1);

QEventTransition *trans2 = new QEventTransition(txt_, QEvent::FocusOut, stateFocusedOut);
stateFocusedIn->addTransition(trans2);

QPropertyAnimation *anim1 = new QPropertyAnimation(lbl_, "geometry");
trans1->addAnimation(anim1);

QPropertyAnimation *anim2 = new QPropertyAnimation(lbl_, "geometry");
trans2->addAnimation(anim2);

sm->start();

And the animations doesn't work when I use events for the state transitions. But if I change QEventTransition to QSignalTransition by replacing the events with some arbitrary QLineEdit signal - everything works.

I tried subclassing QLineEdit and emitting custom signals on focus in/out events, but it seemed like it didn't help.

What might be the cause?