These classes provide everything you need for a typical modern main application window, like the main window itself, menu and tool bars, a statusbar, etc.
QAction | Abstract user interface action that can be inserted into widgets with QWidget::addAction()
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QActionGroup | Groups actions together
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QApplication | Manages the GUI application's control flow and main settings
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QCoreApplication | Event loop for Qt applications
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QDockWindow | Widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop
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QEventLoop | Manages Qt's event queue, excluding GUI-related events
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QMainWindow | Main application window
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QMenu | Menu widget for use in menu bars, context menus, and other popup menus
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QMenuBar | Horizontal menu bar
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QSessionManager | Access to the session manager
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QSizeGrip | Corner-grip for resizing a top-level window
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QStatusBar | Horizontal bar suitable for presenting status information
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QToolBar | Movable panel that contains a set of controls
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QWorkspace | Workspace window that be used in an MDI application
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