The QCloseEvent class contains parameters that describe a close event.| doc.qt.io
The QSettings class provides persistent platform-independent application settings.| doc.qt.io
The QRect class defines a rectangle in the plane using integer precision.| doc.qt.io
The QMetaType class manages named types in the meta-object system.| 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 QDataStream class provides serialization of binary data to a QIODevice.| 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
Windows and Dialogs in Qt.| doc.qt.io
The QPixmap class is an off-screen image representation that can be used as a paint device.| doc.qt.io
The QMap class is a template class that provides an associative array.| doc.qt.io
The QVariant class acts like a union for the most common Qt data types.| doc.qt.io
The QByteArray class provides an array of bytes.| doc.qt.io
The QString class provides a Unicode character string.| doc.qt.io
The QCoreApplication class provides an event loop for Qt applications without UI.| doc.qt.io