Qt GUI C++ Classes

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

Namespaces

QColorConstants

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

QChildWindowEvent

Contains event parameters for child window changes

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

QFont::Tag

QFont::Tag type provides access to advanced font features

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::QAndroidScreen

Native interface to a screen

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::QWaylandScreen

Native interface to a screen on Wayland

QNativeInterface::QWindowsScreen

Native interface to a screen

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

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

QRhi

Accelerated 2D/3D graphics API abstraction

QRhiBuffer

Vertex, index, or uniform (constant) buffer resource

QRhiBuffer::NativeBuffer

Contains information about the underlying native resources of a buffer

QRhiColorAttachment

Describes the a single color attachment of a render target

QRhiCommandBuffer

Command buffer resource

QRhiComputePipeline

Compute pipeline state resource

QRhiD3D11InitParams

Direct3D 11 specific initialization parameters

QRhiD3D11NativeHandles

Holds the D3D device and device context used by the QRhi

QRhiD3D12CommandBufferNativeHandles

Holds the ID3D12GraphicsCommandList1 object that is backing a QRhiCommandBuffer

QRhiD3D12InitParams

Direct3D 12 specific initialization parameters

QRhiD3D12NativeHandles

Holds the D3D12 device used by the QRhi

QRhiDepthStencilClearValue

Specifies clear values for a depth or stencil buffer

QRhiDriverInfo

Describes the physical device, adapter, or graphics API implementation that is used by an initialized QRhi

QRhiGles2InitParams

OpenGL specific initialization parameters

QRhiGles2NativeHandles

Holds the OpenGL context used by the QRhi

QRhiGraphicsPipeline

Graphics pipeline state resource

QRhiGraphicsPipeline::StencilOpState

Describes the stencil operation state

QRhiGraphicsPipeline::TargetBlend

Describes the blend state for one color attachment

QRhiInitParams

Base class for backend-specific initialization parameters

QRhiNativeHandles

Base class for classes exposing backend-specific collections of native resource objects

QRhiNullInitParams

Null backend specific initialization parameters

QRhiNullNativeHandles

Empty

QRhiReadbackDescription

Describes a readback (reading back texture contents from possibly GPU-only memory) operation

QRhiReadbackResult

Describes the results of a potentially asynchronous buffer or texture readback operation

QRhiRenderBuffer

Renderbuffer resource

QRhiRenderBuffer::NativeRenderBuffer

Wraps a native renderbuffer object

QRhiRenderPassDescriptor

Render pass resource

QRhiRenderTarget

Represents an onscreen (swapchain) or offscreen (texture) render target

QRhiResource

Base class for classes encapsulating native resource objects

QRhiResourceUpdateBatch

Records upload and copy type of operations

QRhiSampler

Sampler resource

QRhiScissor

Specifies a scissor rectangle

QRhiShaderResourceBinding

Describes the shader resource for a single binding point

QRhiShaderResourceBindings

Encapsulates resources for making buffer, texture, sampler resources visible to shaders

QRhiShaderStage

Specifies the type and the shader code for a shader stage in the pipeline

QRhiStats

Statistics provided from the underlying memory allocator

QRhiSwapChain

Swapchain resource

QRhiSwapChainHdrInfo

Describes the high dynamic range related information of the swapchain's associated output

QRhiSwapChainProxyData

Opaque data describing native objects needed to set up a swapchain

QRhiSwapChainRenderTarget

Swapchain render target resource

QRhiTexture

Texture resource

QRhiTexture::NativeTexture

Contains information about the underlying native resources of a texture

QRhiTextureCopyDescription

Describes a texture-to-texture copy operation

QRhiTextureRenderTarget

Texture render target resource

QRhiTextureRenderTargetDescription

Describes the color and depth or depth/stencil attachments of a render target

QRhiTextureSubresourceUploadDescription

Describes the source for one mip level in a layer in a texture upload operation

QRhiTextureUploadDescription

Describes a texture upload operation

QRhiTextureUploadEntry

Describes one layer (face for cubemaps, slice for 3D textures, element for texture arrays) in a texture upload operation

QRhiVertexInputAttribute

Describes a single vertex input element

QRhiVertexInputBinding

Describes a vertex input binding

QRhiVertexInputLayout

Describes the layout of vertex inputs consumed by a vertex shader

QRhiViewport

Specifies a viewport rectangle

QRhiVulkanCommandBufferNativeHandles

Holds the Vulkan command buffer object that is backing a QRhiCommandBuffer

QRhiVulkanInitParams

Vulkan specific initialization parameters

QRhiVulkanNativeHandles

Collects device, queue, and other Vulkan objects that are used by the QRhi

QRhiVulkanRenderPassNativeHandles

Holds the Vulkan render pass object backing a QRhiRenderPassDescriptor

QScreen

Used to query screen properties

QScrollEvent

Sent when scrolling

QScrollPrepareEvent

Sent in preparation of scrolling

QSessionManager

Access to the session manager

QShader

Contains multiple versions of a shader translated to multiple shading languages, together with reflection metadata

QShader::NativeShaderInfo

Additional metadata about the native shader code

QShader::SeparateToCombinedImageSamplerMapping

Mapping metadata for sampler uniforms

QShaderCode

Contains source or binary code for a shader and additional metadata

QShaderDescription

Describes the interface of a shader

QShaderDescription::BlockVariable

Describes a member of a uniform or push constant block

QShaderDescription::BuiltinVariable

Describes a built-in variable

QShaderDescription::InOutVariable

Describes an input or output variable in the shader

QShaderDescription::PushConstantBlock

Describes a push constant block

QShaderDescription::StorageBlock

Describes a shader storage block

QShaderDescription::UniformBlock

Describes a uniform block

QShaderKey

Specifies the shading language, the version with flags, and the variant

QShaderVersion

Specifies the shading language version

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 1.3 API

QVulkanExtension

Represents information about a Vulkan extension

QVulkanFunctions

Cross-platform access to the instance level core Vulkan 1.3 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.