Qt GUI C++ Classes

The Qt GUI module provides the basic enablers for graphical applications written with Qt. More...

Reference

Qt GUI C++ Classes
- Event Classes
- Painting Classes
- Rendering in 3D

Event Classes

These Qt Core classes are used to create and handle events.

For more information see the Event System page.

QAbstractEventDispatcher	Interface to manage Qt‘s event queue
QActionEvent	Event that is generated when a QAction is added, removed, or changed
QBasicTimer	Timer events for objects
QChildEvent	Contains event parameters for child object events
QCloseEvent	Contains parameters that describe a close event
QContextMenuEvent	Contains parameters that describe a context menu event
QDragEnterEvent	Event which is sent to a widget when a drag and drop action enters it
QDragLeaveEvent	Event that is sent to a widget when a drag and drop action leaves it
QDragMoveEvent	Event which is sent while a drag and drop action is in progress
QDropEvent	Event which is sent when a drag and drop action is completed
QDynamicPropertyChangeEvent	Contains event parameters for dynamic property change events
QEnterEvent	Contains parameters that describe an enter event
QEvent	The base class of all event classes. Event objects contain event parameters
QExposeEvent	Contains event parameters for expose events
QFileOpenEvent	Event that will be sent when there is a request to open a file or a URL
QFocusEvent	Contains event parameters for widget focus events
QGestureEvent	The description of triggered gestures
QHelpEvent	Event that is used to request helpful information about a particular point in a widget
QHideEvent	Event which is sent after a widget is hidden
QHoverEvent	Contains parameters that describe a mouse event
QIconDragEvent	Indicates that a main icon drag has begun
QInputEvent	The base class for events that describe user input
QInputMethodEvent	Parameters for input method events
QKeyEvent	Describes a key event
QMouseEvent	Contains parameters that describe a mouse event
QMoveEvent	Contains event parameters for move events
QNativeGestureEvent	Contains parameters that describe a gesture event
QPaintEvent	Contains event parameters for paint events
QResizeEvent	Contains event parameters for resize events
QScrollEvent	Sent when scrolling
QScrollPrepareEvent	Sent in preparation of scrolling
QShortcut	Used to create keyboard shortcuts
QShortcutEvent	Event which is generated when the user presses a key combination
QShowEvent	Event that is sent when a widget is shown
QStatusTipEvent	Event that is used to show messages in a status bar
QTabletEvent	Contains parameters that describe a Tablet event
QTimer	Repetitive and single-shot timers
QTimerEvent	Contains parameters that describe a timer event
QTouchEvent	Contains parameters that describe a touch event
QWhatsThisClickedEvent	Event that can be used to handle hyperlinks in a "What‘s This?" text
QWheelEvent	Contains parameters that describe a wheel event
QWindowStateChangeEvent	The window state before a window state change

Painting Classes

See also this introduction to the Qt coordinate system.

QBitmap	Monochrome (1-bit depth) pixmaps
QBrush	Defines the fill pattern of shapes drawn by QPainter
QColor	Colors based on RGB, HSV or CMYK values
QColormap	Maps device independent QColors to device dependent pixel values
QConicalGradient	Used in combination with QBrush to specify a conical gradient brush
QFont	Specifies a font used for drawing text
QFontMetrics	Font metrics information
QFontMetricsF	Font metrics information
QGenericMatrix	Template class that represents a NxM transformation matrix with N columns and M rows
QGradient	Used in combination with QBrush to specify gradient fills
QIcon	Scalable icons in different modes and states
QIconEngine	Abstract base class for QIcon renderers
QImage	Hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device
QImageReader	Format independent interface for reading images from files or other devices
QImageWriter	Format independent interface for writing images to files or other devices
QLine	Two-dimensional vector using integer precision
QLineF	Two-dimensional vector using floating point precision
QLinearGradient	Used in combination with QBrush to specify a linear gradient brush
QMargins	Defines the four margins of a rectangle
QMarginsF	Defines the four margins of a rectangle
QPagedPaintDevice	Represents a paintdevice that supports multiple pages
QPaintDevice	The base class of objects that can be painted on with QPainter
QPaintEngine	Abstract definition of how QPainter draws to a given device on a given platform
QPainter	Performs low-level painting on widgets and other paint devices
QPainterPath	Container for painting operations, enabling graphical shapes to be constructed and reused
QPainterPathStroker	Used to generate fillable outlines for a given painter path
QPdfWriter	Class to generate PDFs that can be used as a paint device
QPen	Defines how a QPainter should draw lines and outlines of shapes
QPixmap	Off-screen image representation that can be used as a paint device
QPoint	Defines a point in the plane using integer precision
QPointF	Defines a point in the plane using floating point precision
QPolygon	Vector of points using integer precision
QPolygonF	Vector of points using floating point precision
QRadialGradient	Used in combination with QBrush to specify a radial gradient brush
QRect	Defines a rectangle in the plane using integer precision
QRectF	Defines a rectangle in the plane using floating point precision
QRegion	Specifies a clip region for a painter
QSize	Defines the size of a two-dimensional object using integer point precision
QSizeF	Defines the size of a two-dimensional object using floating point precision
QStylePainter	Convenience class for drawing QStyle elements inside a widget
QSupportedWritingSystems	Used when registering fonts with the internal Qt fontdatabase
QSvgGenerator	Paint device that is used to create SVG drawings
QSvgRenderer	Used to draw the contents of SVG files onto paint devices
QSvgWidget	Widget that is used to display the contents of Scalable Vector Graphics (SVG) files
QTransform	Specifies 2D transformations of a coordinate system
QVector2D	Represents a vector or vertex in 2D space

Rendering in 3D

QGenericMatrix	Template class that represents a NxM transformation matrix with N columns and M rows
QMatrix4x4	Represents a 4x4 transformation matrix in 3D space
QOpenGLBuffer	Functions for creating and managing OpenGL buffer objects
QOpenGLDebugLogger	Enables logging of OpenGL debugging messages
QOpenGLDebugMessage	Wraps an OpenGL debug message
QOpenGLFramebufferObject	Encapsulates an OpenGL framebuffer object
QOpenGLFramebufferObjectFormat	Specifies the format of an OpenGL framebuffer object
QOpenGLFunctions	Cross-platform access to the OpenGL ES 2.0 API
QOpenGLPaintDevice	Enables painting to an OpenGL context using QPainter
QOpenGLShader	Allows OpenGL shaders to be compiled
QOpenGLShaderProgram	Allows OpenGL shader programs to be linked and used
QOpenGLTimeMonitor	Wraps a sequence of OpenGL timer query objects
QOpenGLTimerQuery	Wraps an OpenGL timer query object
QOpenGLVertexArrayObject	Wraps an OpenGL Vertex Array Object
QOpenGLVertexArrayObject::Binder	QOpenGLVertexArrayObject::Binder class is a convenience class to help with the binding and releasing of OpenGL Vertex Array Objects
QQuaternion	Represents a quaternion consisting of a vector and scalar
QVector2D	Represents a vector or vertex in 2D space
QVector3D	Represents a vector or vertex in 3D space
QVector4D	Represents a vector or vertex in 4D space

QtGUI Module's Classes

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