The QPalette class contains color groups for each widget state.| doc.qt.io
The QAbstractItemView class provides the basic functionality for item view classes.| doc.qt.io
The QStyle class is an abstract base class that encapsulates the look and feel of a GUI.| doc.qt.io
The QSize class defines the size of a two-dimensional object using integer point precision.| 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