These classes are abstract widgets; they are generally not usable in themselves, but provide functionality that can be used by inheriting these classes.
| QAbstractButton | The abstract base class of button widgets, providing functionality common to buttons
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| QAbstractSlider | Integer value within a range
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| QAbstractSpinBox | Spinwidget and a lineedit to display values
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| QDialog | The base class of dialog windows
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| QFrame | The base class of widgets that can have a frame
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| QViewport | Scrolling area with on-demand scroll bars
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| QWidget | The base class of all user interface objects
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