QWidget* widget = new QWidget(); widget->activateWindow(); // activates the widget
QTabWidget* tabWidget = new QTabWidget(); QWidget* widget = new QWidget(tabWidget); tabWidget->addTab(widget, "Tab 1"); tabWidget->setCurrentIndex(0); widget->activateWindow(); // activates the tab widgetThis example creates a QTabWidget with a QWidget added as a tab. The `setCurrentIndex()` function sets the active tab to the first tab, and the `activateWindow()` function brings the tab to the front and activates it. These examples make use of the Qt framework's QWidget class and are written in C++. Therefore, to use the `activateWindow()` function, the QtCore and QtGui packages/libraries must be included in the project.