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 QAbstractButton class is the abstract base class of button widgets, providing functionality common to buttons. |
| QAbstractScrollArea | The QAbstractScrollArea widget provides a scrolling area with on-demand scroll bars. |
| QAbstractSlider | The QAbstractSlider class provides an integer value within a range. |
| QAbstractSpinBox | The QAbstractSpinBox class provides a spinbox and a line edit to display values. |
| QDialog | The QDialog class is the base class of dialog windows. |
| QFrame | The QFrame class is the base class of widgets that can have a frame. |