Qt GUI C++ Classes

• QColorConstants: The QColorConstants namespace contains QColor predefined constants.

• QAbstractFileIconProvider: The QAbstractFileIconProvider class provides file icons for the QFileSystemModel class.

• QAbstractTextDocumentLayout: The QAbstractTextDocumentLayout class is an abstract base class used to implement custom layouts for QTextDocuments.

• QAbstractTextDocumentLayout::PaintContext: The QAbstractTextDocumentLayout::PaintContext class is a convenience class defining the parameters used when painting a document's layout.

• QAbstractTextDocumentLayout::Selection: The QAbstractTextDocumentLayout::Selection class is a convenience class defining the parameters of a selection.

• QAccessible: The QAccessible class provides enums and static functions related to accessibility.

• QAccessible::State:

• QAccessibleActionInterface: The QAccessibleActionInterface class implements support for invocable actions in the interface.

• QAccessibleEditableTextInterface: The QAccessibleEditableTextInterface class implements support for objects with editable text.

• QAccessibleEvent: The QAccessibleEvent class is the base class for accessibility notifications.

• QAccessibleInterface: The QAccessibleInterface class defines an interface that exposes information about accessible objects.

• QAccessibleObject: The QAccessibleObject class implements parts of the QAccessibleInterface for QObjects.

• QAccessiblePlugin: The QAccessiblePlugin class provides an abstract base class for plugins provinding accessibility information for user interface elements.

• QAccessibleStateChangeEvent: The QAccessibleStateChangeEvent notfies the accessibility framework that the state of an object has changed.

• QAccessibleTableCellInterface: The QAccessibleTableCellInterface class implements support for the IAccessibleTable2 Cell interface.

• QAccessibleTableInterface: The QAccessibleTableInterface class implements support for the IAccessibleTable2 interface.

• QAccessibleTableModelChangeEvent: The 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: The QAccessibleTextCursorEvent class notifies of cursor movements.

• QAccessibleTextInsertEvent: The QAccessibleTextInsertEvent class notifies of text being inserted.

• QAccessibleTextInterface: The QAccessibleTextInterface class implements support for text handling.

• QAccessibleTextRemoveEvent: The QAccessibleTextRemoveEvent class notifies of text being deleted.

• QAccessibleTextSelectionEvent: QAccessibleTextSelectionEvent signals a change in the text selection of an object.

• QAccessibleTextUpdateEvent: The QAccessibleTextUpdateEvent class 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: The QAccessibleValueChangeEvent describes a change in value for an accessible object.

• QAccessibleValueInterface: The QAccessibleValueInterface class implements support for objects that manipulate a value.

• QAction: The QAction class provides an abstraction for user commands that can be added to different user interface components.

• QActionEvent: The QActionEvent class provides an event that is generated when a QAction is added, removed, or changed.

• QActionGroup: The QActionGroup class groups actions together.

• QBackingStore: The QBackingStore class provides a drawing area for QWindow.

• QBitmap: The QBitmap class provides monochrome (1-bit depth) pixmaps.

• QBrush: The QBrush class defines the fill pattern of shapes drawn by QPainter.

• QClipboard: The QClipboard class provides access to the window system clipboard.

• QCloseEvent: The QCloseEvent class contains parameters that describe a close event.

• QColor: The QColor class provides colors based on RGB, HSV or CMYK values.

• QColorSpace: The QColorSpace class provides a color space abstraction.

• QColorTransform: The QColorTransform class is a transformation between color spaces.

• QConicalGradient: The QConicalGradient class is used in combination with QBrush to specify a conical gradient brush.

• QContextMenuEvent: The QContextMenuEvent class contains parameters that describe a context menu event.

• QCursor: The QCursor class provides a mouse cursor with an arbitrary shape.

• QDesktopServices: The QDesktopServices class provides methods for accessing common desktop services.

• QDoubleValidator: The QDoubleValidator class provides range checking of floating-point numbers.

• QDrag: The QDrag class provides support for MIME-based drag and drop data transfer.

• QDragEnterEvent: The QDragEnterEvent class provides an event which is sent to a widget when a drag and drop action enters it.

• QDragLeaveEvent: The QDragLeaveEvent class provides an event that is sent to a widget when a drag and drop action leaves it.

• QDragMoveEvent: The QDragMoveEvent class provides an event which is sent while a drag and drop action is in progress.

• QDropEvent: The QDropEvent class provides an event which is sent when a drag and drop action is completed.

• QEnterEvent: The QEnterEvent class contains parameters that describe an enter event.

• QEventPoint: The QEventPoint class provides information about a point in a QPointerEvent.

• QExposeEvent: The QExposeEvent class contains event parameters for expose events.

• QFileOpenEvent: The QFileOpenEvent class provides an event that will be sent when there is a request to open a file or a URL.

• QFileSystemModel: The QFileSystemModel class provides a data model for the local filesystem.

• QFocusEvent: The QFocusEvent class contains event parameters for widget focus events.

• QFont: The QFont class specifies a query for a font used for drawing text.

• QFontDatabase: The QFontDatabase class provides information about the fonts available in the underlying window system.

• QFontInfo: The QFontInfo class provides general information about fonts.

• QFontMetrics: The QFontMetrics class provides font metrics information.

• QFontMetricsF: The QFontMetricsF class provides font metrics information.

• QGenericMatrix: The QGenericMatrix class is a template class that represents a NxM transformation matrix with N columns and M rows.

• QGenericPlugin: The QGenericPlugin class is an abstract base class for plugins.

• QGenericPluginFactory: The QGenericPluginFactory class creates plugin drivers.

• QGlyphRun: The QGlyphRun class provides direct access to the internal glyphs in a font.

• QGradient: The QGradient class is used in combination with QBrush to specify gradient fills.

• QGuiApplication: The QGuiApplication class manages the GUI application's control flow and main settings.

• QHelpEvent: The QHelpEvent class provides an event that is used to request helpful information about a particular point in a widget.

• QHideEvent: The QHideEvent class provides an event which is sent after a widget is hidden.

• QHoverEvent: The QHoverEvent class contains parameters that describe a mouse event.

• QIcon: The QIcon class provides scalable icons in different modes and states.

• QIconDragEvent: The QIconDragEvent class indicates that a main icon drag has begun.

• QIconEngine: The QIconEngine class provides an abstract base class for QIcon renderers.

• QIconEngine::ScaledPixmapArgument:

• QIconEnginePlugin: The QIconEnginePlugin class provides an abstract base for custom QIconEngine plugins.

• QImage: The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.

• QImageIOHandler: The QImageIOHandler class defines the common image I/O interface for all image formats in Qt.

• QImageIOPlugin: The QImageIOPlugin class defines an interface for writing an image format plugin.

• QImageReader: The QImageReader class provides a format independent interface for reading images from files or other devices.

• QImageWriter: The QImageWriter class provides a format independent interface for writing images to files or other devices.

• QInputDevice: The QInputDevice class describes a device from which a QInputEvent originates.

• QInputEvent: The QInputEvent class is the base class for events that describe user input.

• QInputMethod: The QInputMethod class provides access to the active text input method.

• QInputMethodEvent: The QInputMethodEvent class provides parameters for input method events.

• QInputMethodEvent::Attribute: The QInputMethodEvent::Attribute class stores an input method attribute.

• QInputMethodQueryEvent: The QInputMethodQueryEvent class provides an event sent by the input context to input objects.

• QIntValidator: The QIntValidator class provides a validator that ensures a string contains a valid integer within a specified range.

• QKeyEvent: The QKeyEvent class describes a key event.

• QKeySequence: The QKeySequence class encapsulates a key sequence as used by shortcuts.

• QLinearGradient: The QLinearGradient class is used in combination with QBrush to specify a linear gradient brush.

• QMatrix4x4: The QMatrix4x4 class represents a 4x4 transformation matrix in 3D space.

• QMouseEvent: The QMouseEvent class contains parameters that describe a mouse event.

• QMoveEvent: The QMoveEvent class contains event parameters for move events.

• QMovie: The QMovie class is a convenience class for playing movies with QImageReader.

• QNativeGestureEvent: The QNativeGestureEvent class 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::QX11Application: Native interface to an X11 application.

• QOffscreenSurface: The QOffscreenSurface class represents an offscreen surface in the underlying platform.

• QOpenGLContext: The QOpenGLContext class represents a native OpenGL context, enabling OpenGL rendering on a QSurface.

• QOpenGLContextGroup: The QOpenGLContextGroup class represents a group of contexts sharing OpenGL resources.

• QOpenGLExtraFunctions: The QOpenGLExtraFunctions class provides cross-platform access to the OpenGL ES 3.0, 3.1 and 3.2 API.

• QOpenGLFunctions: The QOpenGLFunctions class provides cross-platform access to the OpenGL ES 2.0 API.

• QPageLayout: Describes the size, orientation and margins of a page.

• QPageRanges: The QPageRanges class represents a collection of page ranges.

• QPageRanges::Range: The QPageRanges::Range struct holds the from and to endpoints of a range.

• QPageSize: The QPageSize class describes the size and name of a defined page size.

• QPagedPaintDevice: The QPagedPaintDevice class represents a paint device that supports multiple pages.

• QPaintDevice: The QPaintDevice class is the base class of objects that can be painted on with QPainter.

• QPaintDeviceWindow: Convenience subclass of QWindow that is also a QPaintDevice.

• QPaintEngine: The QPaintEngine class provides an abstract definition of how QPainter draws to a given device on a given platform.

• QPaintEngineState: The QPaintEngineState class provides information about the active paint engine's current state.

• QPaintEvent: The QPaintEvent class contains event parameters for paint events.

• QPainter: The QPainter class 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: The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.

• QPainterPath::Element: The QPainterPath::Element class specifies the position and type of a subpath.

• QPainterPathStroker: The QPainterPathStroker class is used to generate fillable outlines for a given painter path.

• QPalette: The QPalette class contains color groups for each widget state.

• QPdfWriter: The QPdfWriter class is a class to generate PDFs that can be used as a paint device.

• QPen: The QPen class defines how a QPainter should draw lines and outlines of shapes.

• QPicture: The QPicture class is a paint device that records and replays QPainter commands.

• QPixelFormat: QPixelFormat is a class for describing different pixel layouts in graphics buffers.

• QPixmap: The QPixmap class is an off-screen image representation that can be used as a paint device.

• QPixmapCache: The QPixmapCache class provides an application-wide cache for pixmaps.

• QPixmapCache::Key: The QPixmapCache::Key class can be used for efficient access to the QPixmapCache.

• QPlatformSurfaceEvent: The QPlatformSurfaceEvent class is used to notify about native platform surface events.

• QPointerEvent: A base class for pointer events.

• QPointingDevice: The QPointingDevice class describes a device from which mouse, touch or tablet events originate.

• QPointingDeviceUniqueId: QPointingDeviceUniqueId identifies a unique object, such as a tagged token or stylus, which is used with a pointing device.

• QPolygon: The QPolygon class provides a list of points using integer precision.

• QPolygonF: The QPolygonF class provides a list of points using floating point precision.

• QQuaternion: The QQuaternion class represents a quaternion consisting of a vector and scalar.

• QRadialGradient: The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush.

• QRasterPaintEngine: The QRasterPaintEngine class enables hardware acceleration of painting operations in Qt for Embedded Linux.

• QRasterWindow: QRasterWindow is a convenience class for using QPainter on a QWindow.

• QRawFont: The QRawFont class provides access to a single physical instance of a font.

• QRegion: The QRegion class specifies a clip region for a painter.

• QRegularExpressionValidator: The QRegularExpressionValidator class is used to check a string against a regular expression.

• QResizeEvent: The QResizeEvent class contains event parameters for resize events.

• QRgba64: The QRgba64 struct contains a 64-bit RGB color.

• QRgbaFloat: The QRgbaFloat struct contains a four part RGBA floating-point color.

• QScreen: The QScreen class is used to query screen properties.

• QScrollEvent: The QScrollEvent class is sent when scrolling.

• QScrollPrepareEvent: The QScrollPrepareEvent class is sent in preparation of scrolling.

• QSessionManager: The QSessionManager class provides access to the session manager.

• QShortcut: The QShortcut class is used to create keyboard shortcuts.

• QShortcutEvent: The QShortcutEvent class provides an event which is generated when the user presses a key combination.

• QShowEvent: The QShowEvent class provides an 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: The QStandardItem class provides an item for use with the QStandardItemModel class.

• QStandardItemModel: The QStandardItemModel class provides a generic model for storing custom data.

• QStaticText: The QStaticText class enables optimized drawing of text when the text and its layout is updated rarely.

• QStatusTipEvent: The QStatusTipEvent class provides an event that is used to show messages in a status bar.

• QStyleHints: The QStyleHints class contains platform specific hints and settings.

• QSupportedWritingSystems: The QSupportedWritingSystems class is used when registering fonts with the internal Qt fontdatabase.

• QSurface: The QSurface class is an abstraction of renderable surfaces in Qt.

• QSurfaceFormat: The QSurfaceFormat class represents the format of a QSurface.

• QSyntaxHighlighter: The QSyntaxHighlighter class 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: The QTabletEvent class contains parameters that describe a Tablet event.

• QTextBlock: The QTextBlock class provides a container for text fragments in a QTextDocument.

• QTextBlock::iterator: The QTextBlock::iterator class provides an iterator for reading the contents of a QTextBlock.

• QTextBlockFormat: The QTextBlockFormat class provides formatting information for blocks of text in a QTextDocument.

• QTextBlockGroup: The QTextBlockGroup class provides a container for text blocks within a QTextDocument.

• QTextBlockUserData: The QTextBlockUserData class is used to associate custom data with blocks of text.

• QTextCharFormat: The QTextCharFormat class provides formatting information for characters in a QTextDocument.

• QTextCursor: The QTextCursor class offers an API to access and modify QTextDocuments.

• QTextDocument: The QTextDocument class holds formatted text.

• QTextDocumentFragment: The QTextDocumentFragment class represents a piece of formatted text from a QTextDocument.

• QTextDocumentWriter: The QTextDocumentWriter class provides a format-independent interface for writing a QTextDocument to files or other devices.

• QTextFormat: The QTextFormat class provides formatting information for a QTextDocument.

• QTextFragment: The QTextFragment class holds a piece of text in a QTextDocument with a single QTextCharFormat.

• QTextFrame: The QTextFrame class represents a frame in a QTextDocument.

• QTextFrameFormat: The QTextFrameFormat class provides formatting information for frames in a QTextDocument.

• QTextImageFormat: The QTextImageFormat class provides formatting information for images in a QTextDocument.

• QTextInlineObject: The QTextInlineObject class represents an inline object in a QAbstractTextDocumentLayout and its implementations.

• QTextItem: The QTextItem class provides all the information required to draw text in a custom paint engine.

• QTextLayout: The QTextLayout class is used to lay out and render text.

• QTextLayout::FormatRange: The QTextLayout::FormatRange structure is used to apply extra formatting information for a specified area in the text layout's content.

• QTextLength: The QTextLength class encapsulates the different types of length used in a QTextDocument.

• QTextLine: The QTextLine class represents a line of text inside a QTextLayout.

• QTextList: The QTextList class provides a decorated list of items in a QTextDocument.

• QTextListFormat: The QTextListFormat class provides formatting information for lists in a QTextDocument.

• QTextObject: The QTextObject class is a base class for different kinds of objects that can group parts of a QTextDocument together.

• QTextObjectInterface: The QTextObjectInterface class allows drawing of custom text objects in QTextDocuments.

• QTextOption: The QTextOption class provides a description of general rich text properties.

• QTextOption::Tab:

• QTextTable: The QTextTable class represents a table in a QTextDocument.

• QTextTableCell: The QTextTableCell class represents the properties of a cell in a QTextTable.

• QTextTableCellFormat: The QTextTableCellFormat class provides formatting information for table cells in a QTextDocument.

• QTextTableFormat: The QTextTableFormat class provides formatting information for tables in a QTextDocument.

• QTouchEvent: The QTouchEvent class contains parameters that describe a touch event.

• QTransform: The QTransform class specifies 2D transformations of a coordinate system.

• QUndoCommand: The QUndoCommand class is the base class of all commands stored on a QUndoStack.

• QUndoGroup: The QUndoGroup class is a group of QUndoStack objects.

• QUndoStack: The QUndoStack class is a stack of QUndoCommand objects.

• QValidator: The QValidator class provides validation of input text.

• QVector2D: The QVector2D class represents a vector or vertex in 2D space.

• QVector3D: The QVector3D class represents a vector or vertex in 3D space.

• QVector4D: The QVector4D class represents a vector or vertex in 4D space.

• QVulkanExtension: Represents information about a Vulkan extension.

• QVulkanInfoVector: A specialized QList for QVulkanLayer and QVulkanExtension.

• QVulkanInstance: The QVulkanInstance class represents a native Vulkan instance, enabling Vulkan rendering onto a QSurface.

• QVulkanLayer: Represents information about a Vulkan layer.

• QVulkanWindow: The QVulkanWindow class is a convenience subclass of QWindow to perform Vulkan rendering.

• QVulkanWindowRenderer: The QVulkanWindowRenderer class is used to implement the application-specific rendering logic for a QVulkanWindow.

• QWhatsThisClickedEvent: The QWhatsThisClickedEvent class provides an event that can be used to handle hyperlinks in a "What's This?" text.

• QWheelEvent: The QWheelEvent class contains parameters that describe a wheel event.

• QWindow: The QWindow class represents a window in the underlying windowing system.

• QWindowStateChangeEvent: The QWindowStateChangeEvent class provides the window state before a window state change.

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