The QWhatsThis class provides a simple description of any widget, i.e. answering the question "What's This?".| 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 QKeySequence class encapsulates a key sequence as used by shortcuts.| doc.qt.io
The QWidget class is the base class of all user interface objects.| doc.qt.io
The QFont class specifies a query for a font used for drawing text.| doc.qt.io
The QIcon class provides scalable icons in different modes and states.| 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 QApplication class manages the GUI application's control flow and main settings.| 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
The QCoreApplication class provides an event loop for Qt applications without UI.| doc.qt.io