The QScrollArea class provides a scrolling view onto another widget.| doc.qt.io
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 QPalette class contains color groups for each widget state.| doc.qt.io
The QLabel widget provides a text or image display.| doc.qt.io
The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.| 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
The QPixmap class is an off-screen image representation that can be used as a paint device.| doc.qt.io
The QLayout class is the base class of geometry managers.| doc.qt.io