The QMetaObject class contains meta-information about Qt objects.| doc.qt.io
The QPaintEvent class contains event parameters for paint events.| doc.qt.io
The QWidget class is the base class of all user interface objects.| doc.qt.io
The QEvent class is the base class of all event classes. Event objects contain event parameters.| doc.qt.io
The QObject class is the base class of all Qt objects.| doc.qt.io
The QApplication class manages the GUI application's control flow and main settings.| doc.qt.io
The QWindow class represents a window in the underlying windowing system.| doc.qt.io
The QQuickItem class provides the most basic of all visual items in Qt Quick.| doc.qt.io
The QCoreApplication class provides an event loop for Qt applications without UI.| doc.qt.io
The QFileOpenEvent class provides an event that will be sent when there is a request to open a file or a URL.| doc.qt.io