These classes are abstract widgets; they are generally not usable in
themselves, but provide functionality that can be used by inheriting
these classes.
| QButton | The abstract base class of button widgets, providing functionality common to buttons
|
| QCanvas | 2D area that can contain QCanvasItem objects
|
| QDialog | The base class of dialog windows
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| QFrame | The base class of widgets that can have a frame
|
| QGridView | Abstract base for fixed-size grids
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| QScrollView | Scrolling area with on-demand scroll bars
|
| QWidget | The base class of all user interface objects
|
| QWizard | Framework for wizard dialogs
|
