QScrollArea with multiple QWidgets only shows empty box - c++

Question

I am trying to create a widget that would display some information. Each information would be a QWidget that contains multiple QLabel with text (the information). My idea is to put multiple (array of these) into a QScrollArea so that the user can view them scrolling up and down. The following code:
InfoWidget::InfoWidget(QWidget* parent) : QWidget(parent){
widgets = new QVector<MarkerInfoWidget*>();
csv_data = 0;
csv_velocity = 0;
labels = 0;
infoWidgetLayout = new QVBoxLayout(this);
setLayout(infoWidgetLayout);
scrollArea = new QScrollArea(this);
scrollWidgetLayout = new QVBoxLayout(scrollArea);
scrollArea->setLayout(scrollWidgetLayout);
infoWidgetLayout->addWidget(scrollArea);
//Test
QString name = "TEST";
for(int i=0; i<10; i++){
MarkerInfoWidget* markerWidget = new MarkerInfoWidget(name, scrollArea);
scrollWidgetLayout->addWidget(markerWidget);
widgets->append(markerWidget);
}
}
Both MarkerInfoWidget and InfoWidget extends QWidget. What I am getting is simply a box that has very small text:
If I drag it out and re-size it, it display correctly:
What I have noticed is that if I re-size it too small, it does not generate scrolls. What do I need to fix this?

Answer 1

I guess changing:
scrollArea->setLayout(scrollWidgetLayout);
to sth like:
QFrame* frame = new QFrame(scrollArea);
frame->setLayout(scrollWidgetLayout);
scrollArea->setWidget(frame);
As far as i know you have to put widget into QScrollableArea to make it really scrollable. Setting its layout is probably not the thing you want to do.