The QToolButton class provides a quick-access button to commands or options, usually used inside a QToolBar.| doc.qt.io
The QImageReader class provides a format independent interface for reading images from files or other devices.| doc.qt.io
The QSize class defines the size of a two-dimensional object using integer point precision.| doc.qt.io
The QRect class defines a rectangle in the plane using integer precision.| doc.qt.io
The QWidget class is the base class of all user interface objects.| doc.qt.io
The QIcon class provides scalable icons in different modes and states.| doc.qt.io
The QPainter class performs low-level painting on widgets and other paint devices.| doc.qt.io
The QGuiApplication class manages the GUI application's control flow and main settings.| doc.qt.io