The QPalette class contains color groups for each widget state.| doc.qt.io
The QWhatsThis class provides a simple description of any widget, i.e. answering the question "What's This?".| doc.qt.io
The QBrush class defines the fill pattern of shapes drawn by QPainter.| doc.qt.io
The QColor class provides colors based on RGB, HSV or CMYK values.| doc.qt.io
The QWidget class is the base class of all user interface objects.| doc.qt.io
The QApplication class manages the GUI application's control flow and main settings.| doc.qt.io
The header file includes Qt fundamental type declarations.| doc.qt.io
The Qt namespace contains miscellaneous identifiers used throughout the Qt library.| doc.qt.io
The QVariant class acts like a union for the most common Qt data types.| doc.qt.io
Reference counting for fast copying.| doc.qt.io