These classes provide everything you need for a typical modern main application window, like the main window itself, menu and tool bars, a status bar, etc.
| QAbstractEventDispatcher | Interface to manage Qt's event queue |
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| QAction | Abstract user interface action that can be inserted into widgets |
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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 console Qt applications |
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| QDialogButtonBox | Widget that presents buttons in a layout that is appropriate to the current widget style |
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| QDockWidget | Widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop |
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| QMainWindow | Main application window |
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| QMdiArea | Area in which MDI windows are displayed |
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| QMdiSubWindow | Subwindow class for QMdiArea |
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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 | Resize handle for resizing top-level windows |
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| QStatusBar | Horizontal bar suitable for presenting status information |
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| QSystemTrayIcon | Icon for an application in the system tray |
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| QToolBar | Movable panel that contains a set of controls |
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| QWidgetAction | Extends QAction by an interface for inserting custom widgets into action based containers, such as toolbars |
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| QWorkspace | Workspace window that can be used in an MDI application |
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