Qt GUI C++ Classes

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

Classes

QAbstractOpenGLFunctions

The base class of a family of classes that expose all functions for each OpenGL version and profile

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

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

QAccessibleObject

Implements parts of the QAccessibleInterface for QObjects

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

QActionEvent

Event that is generated when a QAction is added, removed, or changed

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

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

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

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

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::AvailableSizesArgument

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

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

QOffscreenSurface

Represents an offscreen surface in the underlying platform

QOpenGLBuffer

Functions for creating and managing OpenGL buffer objects

QOpenGLContext

Represents a native OpenGL context, enabling OpenGL rendering on a QSurface

QOpenGLContextGroup

Represents a group of contexts sharing OpenGL resources

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

QOpenGLTimeMonitor

Wraps a sequence of OpenGL timer query objects

QOpenGLTimerQuery

Wraps an OpenGL timer query object

QOpenGLVersionProfile

Represents the version and if applicable the profile of an OpenGL context

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

QOpenGLWindow

Convenience subclass of QWindow to perform OpenGL painting

QPageLayout

Describes the size, orientation and margins of a page

QPageSize

Describes the size and name of a defined page size

QPagedPaintDevice

Represents a paintdevice 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

QPlatformGraphicsBuffer

Windowsystem abstraction for native graphics buffers

QPlatformSurfaceEvent

Used to notify about native platform surface events

QPlatformSystemTrayIcon

Abstracts the system tray icon and interaction

QPolygon

Vector of points using integer precision

QPolygonF

Vector 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

QRegExpValidator

Used to check a string against a regular expression

QRegion

Specifies a clip region for a painter

QResizeEvent

Contains event parameters for resize events

QRgba64

Struct contains a 64-bit RGB color

QScreen

Used to query screen properties

QScrollEvent

Sent when scrolling

QScrollPrepareEvent

Sent in preparation of scrolling

QSessionManager

Access to the session manager

QShortcutEvent

Event which is generated when the user presses a key combination

QShowEvent

Event that is sent when a widget is shown

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

QTouchDevice

Describes the device from which touch events originate

QTouchEvent

Contains parameters that describe a touch event

QTouchEvent::TouchPoint

Information about a touch point in a QTouchEvent

QTransform

Specifies 2D transformations of a coordinate system

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

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

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

© 2016 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.