The QAbstractSlider class provides an integer value within a range.| doc.qt.io
The QAbstractScrollArea widget provides a scrolling area with on-demand scroll bars.| doc.qt.io
The QAbstractItemView class provides the basic functionality for item view classes.| doc.qt.io
The QWidget class is the base class of all user interface objects.| doc.qt.io
The Qt namespace contains miscellaneous identifiers used throughout the Qt library.| doc.qt.io