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c++qttabssizeqtabwidget

QTabWidget size depending on current Tab

I've a QTabWidget, which contains widgets of different heights (their widths are fixed), however, the default implementation ofQTabWidget selects the biggest widget's height as own height.

What I would like to know if there's a (possible fast) way to change the size of QTabWidget depending on its current tab, to save space when smaller tabs are shown.

Solution

  • You can set the size policy of the widget that is displayed to QSizePolicy::Preferred and the other ones to QSizePolicy::Ignored. After that call adjustSize to update the sizes. For example you can connect the currentChanged signal of the QTabWidget to a slot :

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

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

    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();
}