QWidget *firstPageWidget = new QWidget;
    QWidget *secondPageWidget = new QWidget;
    QWidget *thirdPageWidget = new QWidget;

    QStackedWidget *stackedWidget = new QStackedWidget;
    stackedWidget->addWidget(firstPageWidget);
    stackedWidget->addWidget(secondPageWidget);
    stackedWidget->addWidget(thirdPageWidget);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(stackedWidget);
    setLayout(layout);

    QComboBox *pageComboBox = new QComboBox;
    pageComboBox->addItem(tr("Page 1"));
    pageComboBox->addItem(tr("Page 2"));
    pageComboBox->addItem(tr("Page 3"));
    connect(pageComboBox, SIGNAL(activated(int)),
            stackedWidget, SLOT(setCurrentIndex(int)));

Member Function Documentation

QStackedWidget::QStackedWidget(QWidget *parent = nullptr)

Constructs a QStackedWidget with the given parent.

See also addWidget() and insertWidget().

[virtual] QStackedWidget::~QStackedWidget()

Destroys this stacked widget, and frees any allocated resources.

int QStackedWidget::addWidget(QWidget *widget)

Appends the given widget to the QStackedWidget and returns the index position. Ownership of widget is passed on to the QStackedWidget.

If the QStackedWidget is empty before this function is called, widget becomes the current widget.

See also insertWidget(), removeWidget(), and setCurrentWidget().

[signal] void QStackedWidget::currentChanged(int index)

This signal is emitted whenever the current widget changes.

The parameter holds the index of the new current widget, or -1 if there isn't a new one (for example, if there are no widgets in the QStackedWidget).

Note: Notifier signal for property currentIndex.

See also currentWidget() and setCurrentWidget().

QWidget *QStackedWidget::currentWidget() const

Returns the current widget, or 0 if there are no child widgets.

See also currentIndex() and setCurrentWidget().

[override virtual protected] bool QStackedWidget::event(QEvent *e)

Reimplemented from QFrame::event().

int QStackedWidget::indexOf(QWidget *widget) const

Returns the index of the given widget, or -1 if the given widget is not a child of the QStackedWidget.

See also currentIndex() and widget().

int QStackedWidget::insertWidget(int index, QWidget *widget)

Inserts the given widget at the given index in the QStackedWidget. Ownership of widget is passed on to the QStackedWidget. If index is out of range, the widget is appended (in which case it is the actual index of the widget that is returned).

If the QStackedWidget was empty before this function is called, the given widget becomes the current widget.

Inserting a new widget at an index less than or equal to the current index will increment the current index, but keep the current widget.

See also addWidget(), removeWidget(), and setCurrentWidget().

void QStackedWidget::removeWidget(QWidget *widget)

Removes widget from the QStackedWidget. i.e., widget is not deleted but simply removed from the stacked layout, causing it to be hidden.

Note: Parent object and parent widget of widget will remain the QStackedWidget. If the application wants to reuse the removed widget, then it is recommended to re-parent it.

See also addWidget(), insertWidget(), and currentWidget().

[slot] void QStackedWidget::setCurrentWidget(QWidget *widget)

Sets the current widget to be the specified widget. The new current widget must already be contained in this stacked widget.

See also currentWidget() and setCurrentIndex().

QWidget *QStackedWidget::widget(int index) const

Returns the widget at the given index, or 0 if there is no such widget.

See also currentWidget() and indexOf().

[signal] void QStackedWidget::widgetRemoved(int index)

This signal is emitted whenever a widget is removed. The widget's index is passed as parameter.

See also removeWidget().