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# Abstract Widget Classes

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
QAbstractSlider | Integer value within a range
QAbstractSpinBox | Spinwidget and a lineedit to display values
QDialog | The base class of dialog windows
QFrame | The base class of widgets that can have a frame
QViewport | Scrolling area with on-demand scroll bars
QWidget | The base class of all user interface objects