[SOLVED] Using QT Scroll area

[Kieren]

I'm having some trouble creating a QScrollArea display scrollbars and wondered if anyone can see where I'm going wrong. I have a QMainWindow containing the code:

myApp::MyMainMindow() {
    //create the viewer widget  
    QScrollArea * scrollArea = new QScrollArea();
    QVBoxLayout * layout = new QVBoxLayout(scrollArea);
    QWidget * widget = new MyWidget(layout);
    
    layout->addWidget(widget);
    setCentralWidget(scrollArea);
}

As you can see this calls a QWidget class called MyWidget:

MyWidget::MyWidget(QVBoxLayout * layout) {
	for(int i=0; i<10; ++i) {
		QToolButton * btn = new QToolButton();
		btn->resize(200,30);
		btn->setText("Hello world");
		layout->addWidget(btn);
	}
}

So the MyWidget class creates some buttons and inserts them into the QWidget in QMainWindow. That works as expected apart from when the window is resized so that the buttons are caused to overflow. Instead of hiding the buttons that don't fit and adding a scrollbar, the buttons are just resized until they aren't displayed on the screen anymore.

Has anyone got any idea how I can get these scrollbars to work?

[Kieren]

I have finally managed to solve this problem by using an extra QWidget and QVBoxLayout:

myApp::MyMainMindow() {
    QWidget * mainWidget = new QWidget(this);
    QVBoxLayout * vLayout = new QVBoxLayout(mainWidget);
    QScrollArea * scrollArea = new QScrollArea(mainWidget);
    
    scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    scrollArea->setWidgetResizable(false);
    
    QVBoxLayout * scrollAreaVLayout = new QVBoxLayout();
    QWidget * scrollAreaWidgetContents = new MyWidget(scrollAreaVLayout);
    scrollAreaWidgetContents->setLayout(scrollAreaVLayout);
    scrollAreaVLayout->setSizeConstraint(QLayout::SetFixedSize);
    
    scrollArea->setWidget(scrollAreaWidgetContents);
    
    vLayout->addWidget(scrollArea);

    this->setCentralWidget(mainWidget);
}