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Thread: QScrollArea no work properly in QWizardPage object

  1. #1
    Join Date
    Jan 2011
    Posts
    2
    Qt products
    Qt/Embedded
    Platforms
    Unix/X11 Windows

    Default QScrollArea no work properly in QWizardPage object

    Hi everyone,
    I'm finding some problems when I try to add a QScrollArea to QWizardPage widget.
    Below is the code:

    //header WizarPage file

    #ifndef SCROLLPAGE_H
    #define SCROLLPAGE_H

    #include <QtGui>
    #include <QWizardPage>

    #define ITEM 20

    class scrollPage: public QWizardPage
    {
    Q_OBJECT

    public:
    scrollPage(QWidget *parent = 0);

    protected:
    void initializePage();

    private:
    QLabel name[ITEM];
    QLabel data[ITEM];
    QPushButton ButInfo[ITEM];
    QHBoxLayout lineH[ITEM];
    };

    #endif // SCROLLPAGE_H

    //WizardPage implementation
    scrollPage::scrollPage(QWidget *parent)
    : QWizardPage(parent)
    {
    setTitle(tr("SCROLL page title"));

    }

    void scrollPage::initializePage()
    {

    int i = 0;
    /* scroll area */
    QScrollArea* sa = new QScrollArea;
    sa->setWidgetResizable(true);

    QScrollBar *scrollBar = sa->verticalScrollBar();
    scrollBar->setSliderDown( true );

    scrollBar->setValue(0);
    sa->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn) ;
    sa->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysO ff);


    QVBoxLayout * Elenco1 = new QVBoxLayout(sa);

    sa->setLayout(Elenco1);

    while(i< ITEM)
    {
    name[i].setText(tr("NAME"));
    data[i].setText(tr("DATA"));
    ButInfo[i].setText("Info");

    lineH[i].addWidget(&name[i]);
    lineH[i].addWidget(&data[i]);
    lineH[i].addWidget(&ButInfo[i]);

    Elenco1->addLayout(&lineH[i]);
    i++;
    }

    QVBoxLayout * ShowLayout = new QVBoxLayout;
    ShowLayout->addWidget(sa);

    setLayout(ShowLayout);
    }



    When I run the program happens that the page displays a scroll area, but the layout is resized and the page does not scroll.

    Unfortunately they are still a beginner, but if anyone can help I would be very grateful!

    Sincerely,
    Ale

  2. #2
    Join Date
    Jan 2011
    Posts
    2
    Qt products
    Qt/Embedded
    Platforms
    Unix/X11 Windows

    Default Re: QScrollArea no work properly in QWizardPage object

    I discovered the problem.
    I had not considered the fact that QScrollArea use widgets and therefore perform a QScrollArea::SetWidget (widgwet). I modified the code as follows and now works correctly.

    ......
    ........
    scrollBar->setValue(0);
    sa->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn) ;
    sa->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysO ff);


    QWidget* container = new QWidget(this);
    QVBoxLayout * Elenco1 = new QVBoxLayout(container);
    sa->setWidget(container);


    ......
    ...

    while(i< ITEM)
    {
    ......
    .......
    lineH[i].addWidget(&data[i]);
    lineH[i].addWidget(&ButInfo[i]);
    lineH[i].setSizeConstraint(lineH[i].SetFixedSize);

    Elenco1->addLayout(&lineH[i]);
    i++;
    }
    ......
    ..

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