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 |