Trying to add a scrollArea to contain a long sequence of QLineEdits

[feraudyh]

Hi
I developped a window with lots of entry fields, so many that the whole thing doesnt fit onto my screen. So I thought one way out would be to create a scroll area and let the user scroll though this.
Trouble is, all my trials have come to nothing. I was hoping to have a minimal change
Here is the constructor for my window:

MyWindow::MyWindow(QMainWindow *parent)
{
 
    this->m_scrollArea = new QScrollArea;
    m_scrollArea->setBackgroundRole(QPalette::Light);
    setCentralWidget(m_scrollArea);
    this->m_frame = new QFrame(this);
    this->m_vLayout = new QVBoxLayout(m_frame);
    m_scrollArea->setWidget(m_vLayout);
    // add entry fields and labels to m_vLayout below.
 
 
}

MyWindow::MyWindow(QMainWindow *parent)
{

    this->m_scrollArea = new QScrollArea;
    m_scrollArea->setBackgroundRole(QPalette::Light);
    setCentralWidget(m_scrollArea);
    this->m_frame = new QFrame(this);
    this->m_vLayout = new QVBoxLayout(m_frame);
    m_scrollArea->setWidget(m_vLayout);
    // add entry fields and labels to m_vLayout below.


}

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I have of course defined some fields called m_scrollArea, m_frame, etc of the types that you would guess.
When I display my window I just get one big blank area.
Please tell me if you want more detail.
I should add that my window derived from QDialog initially, and then I tried to derive it from QMainWindow in the above code.

[norobro]

I think that you are adding an empty frame to m_scrollArea. Try moving m_scrollArea->setWidget(m_frame) to below where you add widgets to your layout.

[ChrisW67]

As norobro alludes, line 9 fails to compile (no matching call). Did you mean:

m_scrollArea->setWidget(m_frame);

m_scrollArea->setWidget(m_frame);

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You can add the widget to the scroll area after you fill the layout, or you can:

m_vLayout->setSizeConstraint(QLayout::SetMinAndMaxSize);

m_vLayout->setSizeConstraint(QLayout::SetMinAndMaxSize);

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to handle the dynamic changes in the layout after you have installed the frame in the scroll area. See the detailed description of QScrollArea for stuff about dynamic layouts.

[norobro]

I figured that was a typo since he said he was getting "one big blank area"

Thanks for the setSizeConstraint() tip!

[feraudyh]

Yes, I must have copied the version that wouldnt compile. Sorry.

Thanks guys, problem solved.