The QStyleOption class stores the parameters used by QStyle functions.| doc.qt.io
The QCloseEvent class contains parameters that describe a close event.| doc.qt.io
The QMainWindow class provides a main application window.| doc.qt.io
The QDockWidget class provides a widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop.| 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 QAction class provides an abstraction for user commands that can be added to different user interface components.| doc.qt.io
The Qt namespace contains miscellaneous identifiers used throughout the Qt library.| doc.qt.io
The QString class provides a Unicode character string.| doc.qt.io