QMainWindow

QMainWindow is a fundamental class in the Qt framework, providing a main application window. It is designed to offer a standard structure for graphical user interfaces, incorporating features such as a menu bar, toolbars, a dockable widget area, and a status bar. This class acts as the central hub for a typical desktop application, managing the arrangement and interaction of these common window elements.

The main window's central widget is where the primary content of the application is displayed. This central widget can be any QWidget or a derived class, allowing for flexible content design. QMainWindow also supports a docking system, enabling users to detach, rearrange, and attach toolbars and other dockable widgets to different sides of the main window or even to other dock widgets. This provides a customizable user experience.

Key components of a QMainWindow include the menu bar, accessible via setMenuBar(), toolbars added using addToolBar(), and the status bar created with statusBar(). The central area is set using setCentralWidget(). QMainWindow itself inherits from QWidget, thus possessing all the properties and functionalities of a standard widget. It is the recommended base class for applications that require the features it offers, ensuring a consistent and well-structured user interface.