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

  1. #1
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    Default Trying to add a scrollArea to contain a long sequence of QLineEdits

    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:
    Qt Code:
    1. MyWindow::MyWindow(QMainWindow *parent)
    2. {
    3.  
    4. this->m_scrollArea = new QScrollArea;
    5. m_scrollArea->setBackgroundRole(QPalette::Light);
    6. setCentralWidget(m_scrollArea);
    7. this->m_frame = new QFrame(this);
    8. this->m_vLayout = new QVBoxLayout(m_frame);
    9. m_scrollArea->setWidget(m_vLayout);
    10. // add entry fields and labels to m_vLayout below.
    11.  
    12.  
    13. }
    To copy to clipboard, switch view to plain text mode 
    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.
    Last edited by feraudyh; 26th August 2010 at 20:13. Reason: more info

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    Default Re: Trying to add a scrollArea to contain a long sequence of QLineEdits

    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.

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    Default Re: Trying to add a scrollArea to contain a long sequence of QLineEdits

    As norobro alludes, line 9 fails to compile (no matching call). Did you mean:
    Qt Code:
    1. m_scrollArea->setWidget(m_frame);
    To copy to clipboard, switch view to plain text mode 

    You can add the widget to the scroll area after you fill the layout, or you can:
    Qt Code:
    1. m_vLayout->setSizeConstraint(QLayout::SetMinAndMaxSize);
    To copy to clipboard, switch view to plain text mode 
    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.

  4. The following user says thank you to ChrisW67 for this useful post:

    norobro (27th August 2010)

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    Default Re: Trying to add a scrollArea to contain a long sequence of QLineEdits

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

    Thanks for the setSizeConstraint() tip!

  6. #5
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    Default Re: Trying to add a scrollArea to contain a long sequence of QLineEdits

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

    Thanks guys, problem solved.
    Last edited by feraudyh; 27th August 2010 at 11:38. Reason: updated, case closed

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