Qt GUI C++ Classes

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

Namespaces

Contains QColor predefined constants

Classes

QAbstractFileIconProvider	File icons for the QFileSystemModel class
QAbstractTextDocumentLayout	Abstract base class used to implement custom layouts for QTextDocuments
QAbstractTextDocumentLayout::PaintContext	QAbstractTextDocumentLayout::PaintContext class is a convenience class defining the parameters used when painting a document's layout
QAbstractTextDocumentLayout::Selection	QAbstractTextDocumentLayout::Selection class is a convenience class defining the parameters of a selection
QAccessible	Enums and static functions related to accessibility
QAccessible::State
QAccessibleActionInterface	Implements support for invocable actions in the interface
QAccessibleEditableTextInterface	Implements support for objects with editable text
QAccessibleEvent	The base class for accessibility notifications
QAccessibleInterface	Defines an interface that exposes information about accessible objects
QAccessibleObject	Implements parts of the QAccessibleInterface for QObjects
QAccessiblePlugin	Abstract base class for plugins provinding accessibility information for user interface elements
QAccessibleSelectionInterface	Implements support for selection handling
QAccessibleStateChangeEvent	Notfies the accessibility framework that the state of an object has changed
QAccessibleTableCellInterface	Implements support for the IAccessibleTable2 Cell interface
QAccessibleTableInterface	Implements support for the IAccessibleTable2 interface
QAccessibleTableModelChangeEvent	Signifies a change in a table, list, or tree where cells are added or removed. If the change affected a number of rows, firstColumn and lastColumn will return -1. Likewise for columns, the row functions may return -1
QAccessibleTextCursorEvent	Notifies of cursor movements
QAccessibleTextInsertEvent	Notifies of text being inserted
QAccessibleTextInterface	Implements support for text handling
QAccessibleTextRemoveEvent	Notifies of text being deleted
QAccessibleTextSelectionEvent	Signals a change in the text selection of an object
QAccessibleTextUpdateEvent	Notifies about text changes. This is for accessibles that support editable text such as line edits. This event occurs for example when a portion of selected text gets replaced by pasting a new text or in override mode of editors
QAccessibleValueChangeEvent	Describes a change in value for an accessible object
QAccessibleValueInterface	Implements support for objects that manipulate a value
QAction	Abstraction for user commands that can be added to different user interface components
QActionEvent	Event that is generated when a QAction is added, removed, or changed
QActionGroup	Groups actions together
QBackingStore	Drawing area for QWindow
QBitmap	Monochrome (1-bit depth) pixmaps
QBrush	Defines the fill pattern of shapes drawn by QPainter
QClipboard	Access to the window system clipboard
QCloseEvent	Contains parameters that describe a close event
QColor	Colors based on RGB, HSV or CMYK values
QColorSpace	Color space abstraction
QColorTransform	Transformation between color spaces
QConicalGradient	Used in combination with QBrush to specify a conical gradient brush
QContextMenuEvent	Contains parameters that describe a context menu event
QCursor	Mouse cursor with an arbitrary shape
QDesktopServices	Methods for accessing common desktop services
QDoubleValidator	Range checking of floating-point numbers
QDrag	Support for MIME-based drag and drop data transfer
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
QEnterEvent	Contains parameters that describe an enter event
QEventPoint	Information about a point in a QPointerEvent
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
QFileSystemModel	Data model for the local filesystem
QFocusEvent	Contains event parameters for widget focus events
QFont	Specifies a query for a font used for drawing text
QFontDatabase	Information about the fonts available in the underlying window system
QFontInfo	General information about fonts
QFontMetrics	Font metrics information
QFontMetricsF	Font metrics information
QGenericMatrix	Template class that represents a NxM transformation matrix with N columns and M rows
QGenericPlugin	Abstract base class for plugins
QGenericPluginFactory	Creates plugin drivers
QGlyphRun	Direct access to the internal glyphs in a font
QGradient	Used in combination with QBrush to specify gradient fills
QGuiApplication	Manages the GUI application's control flow and main settings
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
QIcon	Scalable icons in different modes and states
QIconDragEvent	Indicates that a main icon drag has begun
QIconEngine	Abstract base class for QIcon renderers
QIconEngine::ScaledPixmapArgument
QIconEnginePlugin	Abstract base for custom QIconEngine plugins
QImage	Hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device
QImageIOHandler	Defines the common image I/O interface for all image formats in Qt
QImageIOPlugin	Defines an interface for writing an image format plugin
QImageReader	Format independent interface for reading images from files or other devices
QImageWriter	Format independent interface for writing images to files or other devices
QInputDevice	Describes a device from which a QInputEvent originates
QInputEvent	The base class for events that describe user input
QInputMethod	Access to the active text input method
QInputMethodEvent	Parameters for input method events
QInputMethodEvent::Attribute	QInputMethodEvent::Attribute class stores an input method attribute
QInputMethodQueryEvent	Event sent by the input context to input objects
QIntValidator	Validator that ensures a string contains a valid integer within a specified range
QKeyEvent	Describes a key event
QKeySequence	Encapsulates a key sequence as used by shortcuts
QLinearGradient	Used in combination with QBrush to specify a linear gradient brush
QMatrix4x4	Represents a 4x4 transformation matrix in 3D space
QMouseEvent	Contains parameters that describe a mouse event
QMoveEvent	Contains event parameters for move events
QMovie	Convenience class for playing movies with QImageReader
QNativeGestureEvent	Contains parameters that describe a gesture event
QNativeInterface::QAndroidOffscreenSurface	Native interface to a offscreen surface on Android
QNativeInterface::QCocoaGLContext	Native interface to an NSOpenGLContext on macOS
QNativeInterface::QEGLContext	Native interface to an EGL context
QNativeInterface::QGLXContext	Native interface to a GLX context
QNativeInterface::QWGLContext	Native interface to a WGL context on Windows
QNativeInterface::QWaylandApplication	Native interface to a Wayland application
QNativeInterface::QX11Application	Native interface to an X11 application
QOffscreenSurface	Represents an offscreen surface in the underlying platform
QOpenGLContext	Represents a native OpenGL context, enabling OpenGL rendering on a QSurface
QOpenGLContextGroup	Represents a group of contexts sharing OpenGL resources
QOpenGLExtraFunctions	Cross-platform access to the OpenGL ES 3.0, 3.1 and 3.2 API
QOpenGLFunctions	Cross-platform access to the OpenGL ES 2.0 API
QOpenGLTexture	Encapsulates an OpenGL texture object
QPageLayout	Describes the size, orientation and margins of a page
QPageRanges	Represents a collection of page ranges
QPageRanges::Range	QPageRanges::Range struct holds the from and to endpoints of a range
QPageSize	Describes the size and name of a defined page size
QPagedPaintDevice	Represents a paint device that supports multiple pages
QPaintDevice	The base class of objects that can be painted on with QPainter
QPaintDeviceWindow	Convenience subclass of QWindow that is also a QPaintDevice
QPaintEngine	Abstract definition of how QPainter draws to a given device on a given platform
QPaintEngineState	Information about the active paint engine's current state
QPaintEvent	Contains event parameters for paint events
QPainter	Performs low-level painting on widgets and other paint devices
QPainter::PixmapFragment	This class is used in conjunction with the QPainter::drawPixmapFragments() function to specify how a pixmap, or sub-rect of a pixmap, is drawn
QPainterPath	Container for painting operations, enabling graphical shapes to be constructed and reused
QPainterPath::Element	QPainterPath::Element class specifies the position and type of a subpath
QPainterPathStroker	Used to generate fillable outlines for a given painter path
QPalette	Contains color groups for each widget state
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
QPicture	Paint device that records and replays QPainter commands
QPixelFormat	Class for describing different pixel layouts in graphics buffers
QPixmap	Off-screen image representation that can be used as a paint device
QPixmapCache	Application-wide cache for pixmaps
QPixmapCache::Key	QPixmapCache::Key class can be used for efficient access to the QPixmapCache
QPlatformSurfaceEvent	Used to notify about native platform surface events
QPointerEvent	A base class for pointer events
QPointingDevice	Describes a device from which mouse, touch or tablet events originate
QPointingDeviceUniqueId	Identifies a unique object, such as a tagged token or stylus, which is used with a pointing device
QPolygon	List of points using integer precision
QPolygonF	List of points using floating point precision
QQuaternion	Represents a quaternion consisting of a vector and scalar
QRadialGradient	Used in combination with QBrush to specify a radial gradient brush
QRasterPaintEngine	Enables hardware acceleration of painting operations in Qt for Embedded Linux
QRasterWindow	Convenience class for using QPainter on a QWindow
QRawFont	Access to a single physical instance of a font
QRegion	Specifies a clip region for a painter
QRegularExpressionValidator	Used to check a string against a regular expression
QResizeEvent	Contains event parameters for resize events
QRgba64	Struct contains a 64-bit RGB color
QRgbaFloat	Struct contains a four part RGBA floating-point color
QScreen	Used to query screen properties
QScrollEvent	Sent when scrolling
QScrollPrepareEvent	Sent in preparation of scrolling
QSessionManager	Access to the session manager
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
QSinglePointEvent	A base class for pointer events containing a single point, such as mouse events
QStandardItem	Item for use with the QStandardItemModel class
QStandardItemModel	Generic model for storing custom data
QStaticText	Enables optimized drawing of text when the text and its layout is updated rarely
QStatusTipEvent	Event that is used to show messages in a status bar
QStyleHints	Contains platform specific hints and settings
QSupportedWritingSystems	Used when registering fonts with the internal Qt fontdatabase
QSurface	Abstraction of renderable surfaces in Qt
QSurfaceFormat	Represents the format of a QSurface
QSyntaxHighlighter	Allows you to define syntax highlighting rules, and in addition you can use the class to query a document's current formatting or user data
QTabletEvent	Contains parameters that describe a Tablet event
QTextBlock	Container for text fragments in a QTextDocument
QTextBlock::iterator	QTextBlock::iterator class provides an iterator for reading the contents of a QTextBlock
QTextBlockFormat	Formatting information for blocks of text in a QTextDocument
QTextBlockGroup	Container for text blocks within a QTextDocument
QTextBlockUserData	Used to associate custom data with blocks of text
QTextCharFormat	Formatting information for characters in a QTextDocument
QTextCursor	Offers an API to access and modify QTextDocuments
QTextDocument	Holds formatted text
QTextDocumentFragment	Represents a piece of formatted text from a QTextDocument
QTextDocumentWriter	Format-independent interface for writing a QTextDocument to files or other devices
QTextFormat	Formatting information for a QTextDocument
QTextFragment	Holds a piece of text in a QTextDocument with a single QTextCharFormat
QTextFrame	Represents a frame in a QTextDocument
QTextFrameFormat	Formatting information for frames in a QTextDocument
QTextImageFormat	Formatting information for images in a QTextDocument
QTextInlineObject	Represents an inline object in a QAbstractTextDocumentLayout and its implementations
QTextItem	All the information required to draw text in a custom paint engine
QTextLayout	Used to lay out and render text
QTextLayout::FormatRange	QTextLayout::FormatRange structure is used to apply extra formatting information for a specified area in the text layout's content
QTextLength	Encapsulates the different types of length used in a QTextDocument
QTextLine	Represents a line of text inside a QTextLayout
QTextList	Decorated list of items in a QTextDocument
QTextListFormat	Formatting information for lists in a QTextDocument
QTextObject	Base class for different kinds of objects that can group parts of a QTextDocument together
QTextObjectInterface	Allows drawing of custom text objects in QTextDocuments
QTextOption	Description of general rich text properties
QTextOption::Tab
QTextTable	Represents a table in a QTextDocument
QTextTableCell	Represents the properties of a cell in a QTextTable
QTextTableCellFormat	Formatting information for table cells in a QTextDocument
QTextTableFormat	Formatting information for tables in a QTextDocument
QTouchEvent	Contains parameters that describe a touch event
QTransform	Specifies 2D transformations of a coordinate system
QUndoCommand	The base class of all commands stored on a QUndoStack
QUndoGroup	Group of QUndoStack objects
QUndoStack	Stack of QUndoCommand objects
QUtiMimeConverter	Converts between a MIME type and a Uniform Type Identifier (UTI) format
QValidator	Validation of input text
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
QVulkanDeviceFunctions	Cross-platform access to the device level core Vulkan 1.2 API
QVulkanExtension	Represents information about a Vulkan extension
QVulkanFunctions	Cross-platform access to the instance level core Vulkan 1.2 API
QVulkanInfoVector	A specialized QList for QVulkanLayer and QVulkanExtension
QVulkanInstance	Represents a native Vulkan instance, enabling Vulkan rendering onto a QSurface
QVulkanLayer	Represents information about a Vulkan layer
QVulkanWindow	Convenience subclass of QWindow to perform Vulkan rendering
QVulkanWindowRenderer	Used to implement the application-specific rendering logic for a QVulkanWindow
QWhatsThisClickedEvent	Event that can be used to handle hyperlinks in a "What's This?" text
QWheelEvent	Contains parameters that describe a wheel event
QWindow	Represents a window in the underlying windowing system
QWindowStateChangeEvent	The window state before a window state change
QWindowsMimeConverter	Maps open-standard MIME to Window Clipboard formats

Detailed Description

The Qt GUI page contains information about how to use the module.

© 2023 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.