Qt Documentation

Qt 5.8
Qt GUI
Qt GUI C++ Classes

Qt GUI C++ Classes

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

Classes

QAccessible	Enums and static functions related to accessibility
QAccessibleEditableTextInterface	Implements support for objects with editable text
QAccessibleEvent	The base class for accessibility notifications
QAccessibleImageInterface	Implements support for the IAccessibleImage interface
QAccessibleInterface	Defines an interface that exposes information about accessible objects
QAccessibleStateChangeEvent	Notfies the accessibility framework that the state of an object has changed
QAccessibleTableCellInterface	Implements support for the IAccessibleTable2 Cell 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
QAccessible::State
QAccessibleObject	Implements parts of the QAccessibleInterface for QObjects
QBitmap	Monochrome (1-bit depth) pixmaps
QIcon	Scalable icons in different modes and states
QIconEngine::AvailableSizesArgument
QIconEngine	Abstract base class for QIcon renderers
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
QMovie	Convenience class for playing movies with QImageReader
QPicture	Paint device that records and replays QPainter commands
QPixmap	Off-screen image representation that can be used as a paint device
QPixmapCache::Key	QPixmapCache::Key class can be used for efficient access to the QPixmapCache
QPixmapCache	Application-wide cache for pixmaps
QStandardItem	Item for use with the QStandardItemModel class
QStandardItemModel	Generic model for storing custom data
QClipboard	Access to the window system clipboard
QCursor	Mouse cursor with an arbitrary shape
QDrag	Support for MIME-based drag and drop data transfer
QInputMethodEvent::Attribute	QInputMethodEvent::Attribute class stores an input method attribute
QActionEvent	Event that is generated when a QAction is added, removed, or changed
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
QEnterEvent	Contains parameters that describe an enter event
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
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
QInputMethodQueryEvent	Event sent by the input context to input objects
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
QPlatformSurfaceEvent	Used to notify about native platform surface events
QPointingDeviceUniqueId	Identifies a unique object, such as a tagged token or stylus, which is used with a pointing device
QResizeEvent	Contains event parameters for resize events
QScrollEvent	Sent when scrolling
QScrollPrepareEvent	Sent in preparation of scrolling
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
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
QTouchEvent::TouchPoint	Information about a touch point in a QTouchEvent
QGenericPlugin	Abstract base class for plugins
QGenericPluginFactory	Creates plugin drivers
QGuiApplication	Manages the GUI application's control flow and main settings
QInputMethod	Access to the active text input method
QKeySequence	Encapsulates a key sequence as used by shortcuts
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
QOpenGLVersionProfile	Represents the version and if applicable the profile of an OpenGL context
QOpenGLWindow	Convenience subclass of QWindow to perform OpenGL painting
QPaintDeviceWindow	Convenience subclass of QWindow that is also a QPaintDevice
QPalette	Contains color groups for each widget state
QPixelFormat	Class for describing different pixel layouts in graphics buffers
QPlatformGraphicsBuffer	Windowsystem abstraction for native graphics buffers
QPlatformSystemTrayIcon	Abstracts the system tray icon and interaction
QRasterWindow	Convenience class for using QPainter on a QWindow
QScreen	Used to query screen properties
QSessionManager	Access to the session manager
QStyleHints	Contains platform specific hints and settings
QSurface	Abstraction of renderable surfaces in Qt
QSurfaceFormat	Represents the format of a QSurface
QTouchDevice	Describes the device from which touch events originate
QWindow	Represents a window in the underlying windowing system
QGenericMatrix	Template class that represents a NxM transformation matrix with N columns and M rows
QMatrix4x4	Represents a 4x4 transformation matrix in 3D space
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
QOpenGLBuffer	Functions for creating and managing OpenGL buffer objects
QOpenGLDebugLogger	Enables logging of OpenGL debugging messages
QOpenGLDebugMessage	Wraps an OpenGL debug message
QOpenGLExtraFunctions	Cross-platform access to the OpenGL ES 3.0 and 3.1 API
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
QOpenGLFunctions_1_0	All functions for OpenGL 1.0 specification
QOpenGLFunctions_1_1	All functions for OpenGL 1.1 specification
QOpenGLFunctions_1_2	All functions for OpenGL 1.2 specification
QOpenGLFunctions_1_3	All functions for OpenGL 1.3 specification
QOpenGLFunctions_1_4	All functions for OpenGL 1.4 specification
QOpenGLFunctions_1_5	All functions for OpenGL 1.5 specification
QOpenGLFunctions_2_0	All functions for OpenGL 2.0 specification
QOpenGLFunctions_2_1	All functions for OpenGL 2.1 specification
QOpenGLFunctions_3_0	All functions for OpenGL 3.0 specification
QOpenGLFunctions_3_1	All functions for OpenGL 3.1 specification
QOpenGLFunctions_3_2_Compatibility	All functions for OpenGL 3.2 compatibility profile
QOpenGLFunctions_3_2_Core	All functions for OpenGL 3.2 core profile
QOpenGLFunctions_3_3_Compatibility	All functions for OpenGL 3.3 compatibility profile
QOpenGLFunctions_3_3_Core	All functions for OpenGL 3.3 core profile
QOpenGLFunctions_4_0_Compatibility	All functions for OpenGL 4.0 compatibility profile
QOpenGLFunctions_4_0_Core	All functions for OpenGL 4.0 core profile
QOpenGLFunctions_4_1_Compatibility	All functions for OpenGL 4.1 compatibility profile
QOpenGLFunctions_4_1_Core	All functions for OpenGL 4.1 core profile
QOpenGLFunctions_4_2_Compatibility	All functions for OpenGL 4.2 compatibility profile
QOpenGLFunctions_4_2_Core	All functions for OpenGL 4.2 core profile
QOpenGLFunctions_4_3_Compatibility	All functions for OpenGL 4.3 compatibility profile
QOpenGLFunctions_4_3_Core	All functions for OpenGL 4.3 core profile
QOpenGLFunctions_4_4_Compatibility	All functions for OpenGL 4.4 compatibility profile
QOpenGLFunctions_4_4_Core	All functions for OpenGL 4.4 core profile
QOpenGLFunctions_4_5_Compatibility	All functions for OpenGL 4.5 compatibility profile
QOpenGLFunctions_4_5_Core	All functions for OpenGL 4.5 core profile
QOpenGLFunctions_ES2	All functions for OpenGL ES 2
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
QOpenGLTexture	Encapsulates an OpenGL texture object
QOpenGLTextureBlitter	Convenient way to draw textured quads via OpenGL
QOpenGLTimeMonitor	Wraps a sequence of OpenGL timer query objects
QOpenGLTimerQuery	Wraps an OpenGL timer query object
QAbstractOpenGLFunctions	The base class of a family of classes that expose all functions for each OpenGL version and profile
QOpenGLVertexArrayObject::Binder	QOpenGLVertexArrayObject::Binder class is a convenience class to help with the binding and releasing of OpenGL Vertex Array Objects
QOpenGLVertexArrayObject	Wraps an OpenGL Vertex Array Object
QBackingStore	Drawing area for QWindow
QBrush	Defines the fill pattern of shapes drawn by QPainter
QConicalGradient	Used in combination with QBrush to specify a conical gradient brush
QGradient	Used in combination with QBrush to specify gradient fills
QLinearGradient	Used in combination with QBrush to specify a linear gradient brush
QRadialGradient	Used in combination with QBrush to specify a radial gradient brush
QColor	Colors based on RGB, HSV or CMYK values
QPagedPaintDevice	Represents a paintdevice that supports multiple pages
QPageLayout	Describes the size, orientation and margins of a page
QPageSize	Describes the size and name of a defined page size
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
QPaintEngineState	Information about the active paint engine's current state
QTextItem	All the information required to draw text in a custom paint engine
QRasterPaintEngine	Enables hardware acceleration of painting operations in Qt for Embedded Linux
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
QPainter	Performs low-level painting on widgets and other paint devices
QPainterPath::Element	QPainterPath::Element class specifies the position and type of a subpath
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
QPolygon	Vector of points using integer precision
QPolygonF	Vector of points using floating point precision
QRegion	Specifies a clip region for a painter
QRgba64	Struct contains a 64-bit RGB color
QTransform	Specifies 2D transformations of a coordinate system
QAbstractTextDocumentLayout::PaintContext	QAbstractTextDocumentLayout::PaintContext class is a convenience class defining the parameters used when painting a document's layout
QAbstractTextDocumentLayout	Abstract base class used to implement custom layouts for QTextDocuments
QTextObjectInterface	Allows drawing of custom text objects in QTextDocuments
QAbstractTextDocumentLayout::Selection	QAbstractTextDocumentLayout::Selection class is a convenience class defining the parameters of a selection
QFont	Specifies 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
QGlyphRun	Direct access to the internal glyphs in a font
QSupportedWritingSystems	Used when registering fonts with the internal Qt fontdatabase
QRawFont	Access to a single physical instance of a font
QStaticText	Enables optimized drawing of text when the text and its layout is updated rarely
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
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
QTextBlockFormat	Formatting information for blocks of text in a QTextDocument
QTextCharFormat	Formatting information for characters in a QTextDocument
QTextFormat	Formatting information for a QTextDocument
QTextFrameFormat	Formatting information for frames in a QTextDocument
QTextImageFormat	Formatting information for images in a QTextDocument
QTextLength	Encapsulates the different types of length used in a QTextDocument
QTextListFormat	Formatting information for lists in a QTextDocument
QTextTableCellFormat	Formatting information for table cells in a QTextDocument
QTextTableFormat	Formatting information for tables in a QTextDocument
QTextLayout::FormatRange	QTextLayout::FormatRange structure is used to apply extra formatting information for a specified area in the text layout's content
QTextInlineObject	Represents an inline object in a QAbstractTextDocumentLayout and its implementations
QTextLayout	Used to lay out and render text
QTextLine	Represents a line of text inside a QTextLayout
QTextList	Decorated list of items in a QTextDocument
QTextBlock	Container for text fragments in a QTextDocument
QTextBlockGroup	Container for text blocks within a QTextDocument
QTextBlockUserData	Used to associate custom data with blocks of text
QTextFragment	Holds a piece of text in a QTextDocument with a single QTextCharFormat
QTextFrame	Represents a frame in a QTextDocument
QTextObject	Base class for different kinds of objects that can group parts of a QTextDocument together
QTextBlock::iterator	QTextBlock::iterator class provides an iterator for reading the contents of a QTextBlock
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
QDesktopServices	Methods for accessing common desktop services
QDoubleValidator	Range checking of floating-point numbers
QIntValidator	Validator that ensures a string contains a valid integer within a specified range
QRegExpValidator	Used to check a string against a regular expression
QValidator	Validation of input text

Detailed Description

The Qt GUI module provides classes for windowing system integration, event handling, OpenGL and OpenGL ES integration, 2D graphics, imaging, fonts and typography. These classes are used internally by Qt's user interface technologies and can also be used directly, for instance to write applications using low-level OpenGL ES graphics APIs.

To include the definitions of the module's classes, use the following directive:

#include <QtGui>

If you use qmake to build your projects, Qt GUI is included by default. To disable Qt GUI, add the following line to your .pro file:

QT -= gui

© 2017 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.

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Qt GUI C++ Classes

Classes

Detailed Description