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QTabWidget size depending on the current tab

I have QTabWidgetone that contains widgets of different heights (their width is fixed), however the default implementation QTabWidgetselects the largest widget height as its own height.

What would I like to know if there is a (possibly quick) way to resize QTabWidgetdepending on the current tab in order to save space when displaying smaller tabs.

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2 answers

You can set the widget size policy displayed on QSizePolicy::Preferred, and the rest on QSizePolicy::Ignored. After that, call adjustSizeto update the sizes. For example, you can connect a signal currentChangedto QTabWidgeta slot:

connect(ui->tabWidget,SIGNAL(currentChanged(int)),this, SLOT(updateSizes(int)));

And set the size policies and adjust the sizes in the slot accordingly:

void MainWindow::updateSizes(int index)
{
    for(int i=0;i<ui->tabWidget->count();i++)
        if(i!=index)
            ui->tabWidget->widget(i)->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

    ui->tabWidget->widget(index)->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
    ui->tabWidget->widget(index)->resize(ui->tabWidget->widget(index)->minimumSizeHint());
    ui->tabWidget->widget(index)->adjustSize();
    resize(minimumSizeHint());
    adjustSize();
}
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OK, so this question already had an accepted answer, but I decided to share my solution, which works remarkably well. This is a small piece of code based on Nejat's answer, and it will work for QTabWidgetand QStackedWidget.

template <typename T>
void pack(T *stacked)
{
    for(int i=0; i<stacked->count(); i++) {
        stacked->widget(i)->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
    }
    QWidget *widget=stacked->currentWidget();
    widget->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    widget->resize(widget->minimumSizeHint());
    widget->adjustSize();
    stacked->resize(stacked->minimumSizeHint());
    stacked->adjustSize();
}

NOTE. I used Minimum instead of Preferred to make it small-sized. In addition, this solution expects that the selected widget is already installed.

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