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QApplication

The QApplication class has been split into two classes: QCoreApplication and QApplication. The new QApplication class inherits QCoreApplication and adds GUI-related functionality. In practice, this has no consequences for existing Qt applications.

In addition, the following API changes were made:

1. QApplication::allWidgets() and QApplication::topLevelWidgets() used to return a pointer to a QWidgetList. Now they return a QWidgetList.
   Also, QWidgetList has changed from being a typedef for QPtrList< QWidget> to being a typedef for QList< QWidget *>. See the section on QWidgetList below for details.
   
   For example, if you have code like

        QWidgetList *list = QApplication::topLevelWidgets();
        QWidgetListIt it(*list);
        QWidget *widget;
        while ((widget = it.current())) {
            if (widget->inherits("MainWindow"))
                ((MainWindow *)widget)->updateRecentFileItems();
            ++it;
        }
        delete list;

   you can rewrite it as

        QWidgetList list = QApplication::topLevelWidgets();
        for (int i = 0; i < list.size(); ++i) {
            if (MainWindow *mainWin = qobject_cast<MainWindow>(list.at(i)))
                mainWin->updateRecentFileItems();
        }

2. QApplication::setMainWidget() is no longer used. When all an application's windows are closed, the application will exit normally.

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