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 appear both in menus and tool bars
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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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| QDockArea | Manages and lays out QDockWindows
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| QDockWindow | Widget which can be docked inside a QDockArea or floated as a top level window on the desktop
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| QEventLoop | Manages the event queue
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| QMainWindow | Main application window, with a menu bar, dock windows (e.g. for toolbars), and a status bar
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| QMenuBar | Horizontal menu bar
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| QPopupMenu | Popup menu widget
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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 containing widgets such as tool buttons
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| QWorkspace | Workspace window that can contain decorated windows, e.g. for MDI
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