QSizePolicy::Maximum on QScrollArea puts Scrollbar on top of containing Widget

ModelTech

I am trying to make a ScrollArea with a vertical scrollbar only. The width of the complete ScrollArea should be such that the complete width of the containing widget is always visible. To this end, I wrote the following code:

    QScrollArea *ScrollArea = new QScrollArea;
    ScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    ScrollArea->setWidget(MyWidget);
    ScrollArea->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Preferred);
    ScrollArea->verticalScrollBar()->setSingleStep(HeightOfMyWidget / ItemsInMyWidget);

If the scrollbar is present (which is only the case when the window size is too small), the scrollbar is always partially hiding the content of MyWidget. How can I solve this?

I have tried to fix the width of the ScrollArea equal to MyWidget.width() + ScrollArea->verticalScrollBar()->width() but that does not give the desired effect, both in case the scrollbar is present and when not --> it gets way too wide in both cases...

mrjj

hi
this seems to align perfectly
ui->widget->setGeometry(0,0, ui->scrollArea->viewport()->width(), 200 );

Note the viewport thing.

ModelTech

Not in my case... I tried:

MyWidget->setGeometry(ScrollArea->x(),ScrollArea->y(), ScrollArea->viewport()->width(), ScrollArea->height());

All works fine except for the width. This makes it actually worse...

mrjj

@ModelTech said:

ScrollArea->x(),ScrollArea->y()

should that not be 0,0 ?

else it should be
MyWidget->setGeometry(ScrollArea->x(),ScrollArea->y(), ScrollArea->viewport()->width() - ScrollArea->x(), ScrollArea-height());

since you offset widget into the viewport. ( if not 0)
so the WIDTH should be adjusted as if widget x is not zero

ModelTech

Unfortunately, that does not help either. Also using 0,0 as x and Y does not change the result. The result is the same as in my previous answer: worse than without the setGeometry call.

mrjj

@ModelTech
ok that is strange
here it makes it fit perfect, with or without scrollbars

ModelTech

Not sure how to post pictures here, but this is the effect without the setGeometry call:

http://i513.photobucket.com/albums/t333/bmc-parts/modeltech/Without_zpsosb3dxgy.png

and this is the effect with the setGeometry call:

http://i513.photobucket.com/albums/t333/bmc-parts/modeltech/With_zpscpluqazz.png

mrjj

@ModelTech
well u cant post images so what u did was the right way.

The area above the profile button with the lineedits?

im not sure what MyWidget refers to, when looking at the images.

ModelTech

MyWidget is the content of the ScrollArea under 'Profiles'/'Time'/'Weight'. The Widget is built up as a QGridLayout where the first two columns are QLineEdit's and the last column is a QToolButton (this last column is partly invisible due to the scrollbar being drawn over it. The QLineEdits have a fixed width of 80, so have the 'Time' and 'Weight' QLabels.

mrjj

@ModelTech
ok, i see.
must be something to do with layout.
I didnt apply one as i was just scaling widget to fit.

so mywidget is the scrollAreaWidgetContents ?

ModelTech

I guess it's maybe easier to give the concrete code, which is part of the constructor for basically the whole widget below the horizontal line.

    QLabel *Label = new QLabel(tr("Profiles"));

    QLabel *TimeLabel = new QLabel(tr("Time"));
    TimeLabel->setFixedWidth(80);
    QLabel *WeightLabel = new QLabel(tr("Weight"));
    WeightLabel->setFixedWidth(80);

    QHBoxLayout *Heading = new QHBoxLayout;
    Heading->setSpacing(2);
    Heading->addWidget(TimeLabel);
    Heading->addWidget(WeightLabel);
    Heading->addStretch();

    QWidget *Profiles = new QWidget;
    QGridLayout *ProfilesGrid = new QGridLayout;
    ProfilesGrid->setSpacing(2);
    ProfilesGrid->setContentsMargins(0, 0, 0, 0);
    for (int i = 0; i != Specification->numberOfProfiles(); i++) {
        QLineEdit *TimeEditor = new QLineEdit(QString("%1").arg(Specification->profile(i)->time()));
        TimeEditor->setFixedWidth(80);
        ProfilesGrid->addWidget(TimeEditor, i, 0);
        QLineEdit *WeightEditor = new QLineEdit(QString("%1").arg(Specification->profile(i)->weight()));
        WeightEditor->setFixedWidth(80);
        ProfilesGrid->addWidget(WeightEditor, i, 1);
        QToolButton *DeleteButton = new QToolButton;
        DeleteButton->setIcon(QIcon(":/icons/delete.png"));
        ProfilesGrid->addWidget(DeleteButton, i, 2);
    }
    Profiles->setLayout(ProfilesGrid);

    QScrollArea *ScrollArea = new QScrollArea;
    ScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    ScrollArea->setWidget(Profiles);
    ScrollArea->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Preferred);
    ScrollArea->verticalScrollBar()->setSingleStep(Profiles->height() / Specification->numberOfProfiles());
//    Profiles->setGeometry(0,0, ScrollArea->viewport()->width(), ScrollArea->height());

    QPushButton *Button = new QPushButton(tr("Add Profile"));
    Button->setFixedWidth(80);

    QVBoxLayout *Layout = new QVBoxLayout;
    Layout->addWidget(Label);
    Layout->addLayout(Heading);
    Layout->addWidget(ScrollArea);
    Layout->addWidget(Button);
    setLayout(Layout);