The QMenu class provides a menu widget for use in menu bars, context menus, and other popup menus.| doc.qt.io
The QStatusBar class provides a horizontal bar suitable for presenting status information.| 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 QToolBar class provides a movable panel that contains a set of controls.| doc.qt.io
The QMenuBar class provides a horizontal menu bar.| doc.qt.io
The QTextEdit class provides a widget that is used to edit and display both plain and rich text.| 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