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# Annotated Class Index

Qt's classes with brief descriptions:

Q3Picture | Paint device that records and replays Q3Painter commands
QAbstractButton | The abstract base class of button widgets, providing functionality common to buttons
QAbstractEventDispatcher | Manages Qt's event queue, excluding GUI-related events
QAbstractItemDelegate | Used to display and edit data items from a model
QAbstractItemModel | The abstract interface for item model classes
QAbstractItemView | The basic functionality for item view classes
QAbstractListModel | Abstract model that can be subclassed to create one-dimensional list models
QAbstractScrollArea | Scrolling area with on-demand scroll bars
QAbstractSlider | Integer value within a range
QAbstractSocket | The base functionality common to all socket types
QAbstractSpinBox | Spinwidget and a line edit to display values
QAbstractTableModel | Abstract model that can be subclassed to create table models
QAbstractTextDocumentLayout | Abstract base class used to implement custom layouts for QTextDocuments
QAccessible | Enums and static functions relating to accessibility
QAccessibleButton | Implements the QAccessibleInterface for button type widgets
QAccessibleComboBox | Implements the QAccessibleInterface for editable and read-only combo boxes
QAccessibleDisplay | Implements the QAccessibleInterface for widgets that display information
QAccessibleHeader | Implements the QAccessibleInterface for header widgets
QAccessibleIconView | Implements the QAccessibleInterface for icon views
QAccessibleInterface | Defines an interface that exposes information about accessible objects
QAccessibleLineEdit | Implements the QAccessibleInterface for widgets with editable text
QAccessibleListBox | Implements the QAccessibleInterface for list boxes
QAccessibleListView | Implements the QAccessibleInterface for list views
QAccessibleObject | Implements parts of the QAccessibleInterface for QObjects
QAccessiblePlugin | Abstract base for accessibility plugins
QAccessibleScrollBar | Implements the QAccessibleInterface for scroll bars
QAccessibleScrollView | Implements the QAccessibleInterface for scrolled widgets
QAccessibleSlider | Implements the QAccessibleInterface for sliders
QAccessibleSpinBox | Implements the QAccessibleInterface for spinbox widgets
QAccessibleTabBar | Implements the QAccessibleInterface for tab bars
QAccessibleTextEdit | Implements the QAccessibleInterface for richtext editors
QAccessibleToolButton | Implements the QAccessibleInterface for tool buttons
QAccessibleWidget | Implements the QAccessibleInterface for QWidgets
QAccessibleWidgetStack | Implements the QAccessibleInterface for widget stacks
QAction | Abstract user interface action that can be inserted into widgets with QWidget::addAction()
QActionGroup | Groups actions together
QApplication | Manages the GUI application's control flow and main settings
QBasicTimer | Timer events for
QBitArray | Array of bits
QBitmap | Monochrome (1-bit depth) pixmaps
QBoxLayout | Lines up child widgets horizontally or vertically
QBrush | Defines the fill pattern of shapes drawn by a QPainter
QBuffer | QIODevice interface for a QByteArray
QButtonGroup | Container to organize groups of button widgets
QByteArray | Array of bytes
QByteArrayMatcher | Holds a sequence of bytes that can be quickly matched in a byte array
QCDEStyle | CDE look and feel
QCache | Template class that provides a cache
QChar | 16-bit Unicode character
QCheckBox | Checkbox with a text label
QChildEvent | Event parameters for child object events
QClipboard | Access to the window system clipboard
QCloseEvent | Parameters that describe a close event
QColor | Colors based on RGB or HSV values
QColorDialog | Dialog widget for specifying colors
QComboBox | Combined button and popup list
QCommonStyle | Encapsulates the common Look and Feel of a GUI
QConicalGradient | Used in combination with QBrush to specify a conical gradient brush
QContextMenuEvent | Parameters that describe a context menu event
QCopChannel | Communication capabilities between several clients
QCoreApplication | Event loop for Qt applications
QCursor | Mouse cursor with an arbitrary shape
QDataStream | Serialization of binary data to a QIODevice
QDate | Date functions
QDateTime | Date and time functions
QDateTimeEdit | Widget for editing dates and times
QDecoration | Allows the appearance of the Qt/Embedded Window Manager to be customized
QDecorationFactory | Creates QDecoration objects
QDecorationPlugin | Abstract base for custom QDecoration plugins
QDesktopWidget | Access to screen information on multi-head systems
QDial | Rounded range control (like a speedometer or potentiometer)
QDialog | The base class of dialog windows
QDir | Access to directory structures and their contents
QDirModel | Data model for the local filesystem
QDirectPainter | Direct access to the video hardware
QDockWidget | Widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop
QDomAttr | Represents one attribute of a QDomElement
QDomCDATASection | Represents an XML CDATA section
QDomCharacterData | Represents a generic string in the DOM
QDomComment | Represents an XML comment
QDomDocument | Represents an XML document
QDomDocumentFragment | Tree of QDomNodes which is not usually a complete QDomDocument
QDomDocumentType | The representation of the DTD in the document tree
QDomElement | Represents one element in the DOM tree
QDomEntity | Represents an XML entity
QDomEntityReference | Represents an XML entity reference
QDomImplementation | Information about the features of the DOM implementation
QDomNamedNodeMap | Collection of nodes that can be accessed by name
QDomNode | The base class for all the nodes in a DOM tree
QDomNodeList | List of QDomNode objects
QDomNotation | Represents an XML notation
QDomProcessingInstruction | Represents an XML processing instruction
QDomText | Represents text data in the parsed XML document
QDoubleSpinBox | Spin box widget that takes doubles
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
QErrorMessage | Error message display dialog
QEvent | The base class of all event classes. Event objects contain event parameters
QFile | Interface for reading from and writing to files
QFileDialog | Dialog that allow users to select files or directories
QFileEngine | Abstraction for accessing the filesystem
QFileEngineHandler | Allows custom QFileEngines to be plugged into Qt
QFileIconProvider | File icon for the QDirModel class
QFileInfo | System-independent file information
QFileOpenEvent | Event that will be sent when there is a request to open a file
QFocusEvent | Event parameters for widget focus events
QFocusFrame | Focus frame which can be outside of a widget's normal paintable area
QFont | Font used for drawing text
QFontDatabase | Information about the fonts available in the underlying window system
QFontDialog | Dialog widget for selecting a font
QFontInfo | General information about fonts
QFontMetrics | Font metrics information
QFontMetricsF | Font metrics information
QFrame | The base class of widgets that can have a frame
QFtp | Implementation of the FTP protocol
QGLColormap | Used for installing custom colormaps into QGLWidgets
QGLContext | Encapsulates an OpenGL rendering context
QGLFormat | The display format of an OpenGL rendering context
QGLWidget | Widget for rendering OpenGL graphics
QGfxDriverFactory | Creates QScreen objects for Qt/Embedded
QGfxDriverPlugin | Abstract base for Qt/Embedded graphics driver plugins
QGradient | Used in combination with QBrush to specify gradient fills
QGridLayout | Lays out widgets in a grid
QGridWidget | Simple geometry management of its children
QGroupBox | Group box frame with a title
QHBoxLayout | Lines up widgets horizontally
QHBoxWidget | Horizontal geometry management for its child widgets
QHash | Template class that provides a hash-table-based dictionary
QHashIterator | Java-style const iterator for QHash and QMultiHash
QHeaderView | Header row or header column for item views
QHideEvent | Event which is sent after a widget is hidden
QHostAddress | IP address
QHostInfo | Static functions for host name lookups
QHoverEvent | Parameters that describe a mouse event
QHttp | Implementation of the HTTP protocol
QHttpHeader | Header information for HTTP
QHttpRequestHeader | Request header information for HTTP
QHttpResponseHeader | Response header information for HTTP
QIODevice | The base interface class of all I/O devices in Qt
QIcon | Scalable icons in different modes and states
QIconDragEvent | Indicates that a main icon drag has begun
QIconEngine | Abstract base class for QIcon renderers
QIconEnginePlugin | Abstract base for custom QIconEngine plugins
QImage | Hardware-independent pixmap representation with direct access to the pixel data
QImageIOHandler | Defines the common image I/O interface for all image formats in Qt
QImageIOHandlerFactoryInterface | The factory interface for QImageIOPlugin
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
QInputContext | Abstracts the input method dependent data and composing state
QInputContextPlugin | Abstract base for custom QInputContext plugins
QInputDialog | Simple convenience dialog to get a single value from the user
QInputEvent | The base class for events that describe user input
QInputMethodEvent | Parameters for input method events
QIntValidator | Validator that ensures a string contains a valid integer within a specified range
QItemDelegate | Display and editing facilities for data items from a model
QItemSelection | Manages information about selected items in a model
QItemSelectionModel | Keeps track of a view's selected items
QItemSelectionRange | Manages information about a range of selected items in a model
QKbdDriverFactory | Creates QWSKeyboardHandler objects for Qt/Embedded
QKbdDriverPlugin | Abstract base for Qt/Embedded keyboard driver plugins
QKeyEvent | Describes a key event
QKeySequence | Encapsulates a key sequence as used by shortcuts
QLCDNumber | Displays a number with LCD-like digits
QLabel | Text or image display
QLatin1Char | 8-bit ASCII/Latin-1 character
QLatin1String | Thin wrapper around an ASCII/Latin-1 encoded string literal
QLayout | The base class of geometry managers
QLayoutItem | Abstract item that a QLayout manipulates
QLibrary | Loads shared libraries at runtime
QLibraryInfo | Information about the Qt library
QLine | Two-dimensional vector that uses integer point coordinates for accuracy
QLineEdit | One-line text editor
QLineF | Two-dimensional vector that uses floating point coordinates for accuracy
QLinearGradient | Used in combination with QBrush to specify a linear gradient brush
QLinkedList | Template class that provides linked lists
QLinkedListIterator | Java-style const iterator for QLinkedList
QList | Template class that provides lists
QListIterator | Java-style const iterator for QList and QQueue
QListView | Default model/view implementation of a list, and of an icon view
QListWidget | Item-based list widget
QListWidgetItem | Item for use with the QListWidget item view class
QLocale | Converts between numbers and their string representations in various languages
QMacMime | Maps open-standard MIME to Mac flavors
QMacStyle | Implements an Appearance Manager style
QMainWindow | Main application window
QMap | Template class that provides a skip-list-based dictionary
QMapIterator | Java-style const iterator for QMap and QMultiMap
QMatrix | 2D transformations of a coordinate system
QMenu | Menu widget for use in menu bars, context menus, and other popup menus
QMenuBar | Horizontal menu bar
QMessageBox | Modal dialog with a short message, an icon, and some buttons
QMetaClassInfo | Additional information about a class
QMetaEnum | Meta data about an enumerator
QMetaMember | Meta data about a member function
QMetaObject | Meta information about Qt objects
QMetaProperty | Meta data about a property
QMimeData | Container for data that records information about its MIME type
QModelIndex | Used to locate data in a data model
QMotifPlusStyle | More sophisticated Motif-ish look and feel
QMotifStyle | Motif look and feel
QMouseDriverFactory | Creates QWSMouseHandler objects for Qt/Embedded
QMouseDriverPlugin | Abstract base for Qt/Embedded mouse driver plugins
QMouseEvent | Parameters that describe a mouse event
QMoveEvent | Event parameters for move events
QMovie | Convenience class for playing movies with QImageReader
QMultiHash | Convenience QHash subclass that provides multi-valued hashes
QMultiMap | Convenience QMap subclass that provides multi-valued maps
QMutableHashIterator | Java-style non-const iterator for QHash and QMultiHash
QMutableLinkedListIterator | Java-style non-const iterator for QLinkedList
QMutableListIterator | Java-style non-const iterator for QList and QQueue
QMutableMapIterator | Java-style non-const iterator for QMap and QMultiMap
QMutableVectorIterator | Java-style non-const iterator for QVector and QStack
QMutex | Access serialization between threads
QMutexLocker | Convenience class that simplifies locking and unlocking mutexes
QObject | The base class of all Qt objects
QObjectCleanupHandler | Watches the lifetime of multiple QObjects
QPaintDevice | The base class of objects that can be painted
QPaintEngine | Abstract definition of how QPainter draws to a given device on a given platform
QPaintEvent | Event parameters for paint events
QPainter | Does low-level painting e.g. on widgets
QPainterPath | Container for painting operations, enabling graphical shapes to be constructed and reused
QPair | Template class that stores a pair of items
QPalette | Color groups for each widget state
QPen | Defines how a QPainter should draw lines and outlines of shapes
QPersistentModelIndex | Used to locate data in a data model
QPicture | Paint device that records and replays QPainter commands
QPictureFormatPlugin | Abstract base for custom picture format plugins
QPictureIO | Parameters for loading and saving pictures
QPixmap | Off-screen, pixel-based paint device
QPixmapCache | Application-wide cache for pixmaps
QPlatinumStyle | Mac/Platinum look and feel
QPluginLoader | Loads a plugin at runtime
QPoint | Defines a point in the plane
QPointF | Point object that uses floating point coordinates for accuracy
QPointer | Template class that provides guarded pointers to QObjects
QPolygon | Vector of points
QPolygonF | Vector of points
QPrintEngine | Defines an interface for how QPrinter interacts with a given printing subsystem
QPrinter | Paint device that paints on a printer
QProcess | Used to start external programs and to communicate with them
QProgressBar | Horizontal progress bar
QProgressDialog | Feedback on the progress of a slow operation
QProxyModel | Support for filtering and sorting data that is passed between another model and a view
QPushButton | Command button
QQueue | Generic container that provides a queue
QRadialGradient | Used in combination with QBrush to specify a radial gradient brush
QRadioButton | Radio button with a text label
QReadLocker | Convenience class that simplifies locking and unlocking read-write locks for read access
QReadWriteLock | Read-write locking
QRect | Defines a rectangle in the plane
QRectF | Defines a rectangle in the plane using floating point coordinates for accuracy
QRegExp | Pattern matching using regular expressions
QRegExpValidator | Used to check a string against a regular expression
QRegion | Clip region for a painter
QResizeEvent | Event parameters for resize events
QResource | Access to application resource data
QRubberBand | Rectangle or line that can indicate a selection or a boundary
QSGIStyle | SGI/Irix look and feel
QScreen | And its descendants manage the framebuffer and palette
QScrollArea | Scrolling view onto another widget
QScrollBar | Vertical or horizontal scroll bar
QSemaphore | General counting semaphore
QSessionManager | Access to the session manager
QSet | Template class that provides a hash-table-based set
QSetIterator | Java-style const iterator for QSet
QSettings | Persistent platform-independent application settings
QSharedData | Base class for shared data objects
QSharedDataPointer | Pointer to a shared data object
QShortcut | Used to create keyboard shortcuts
QShowEvent | Event that is sent when a widget is shown
QSignal | Can be used to send signals for classes that do not inherit QObject
QSignalMapper | Bundles signals from identifiable senders
QSize | Defines the size of a two-dimensional object
QSizeF | Defines the size of a two-dimensional object using floating point values for accuracy
QSizeGrip | Corner-grip for resizing a top-level window
QSizePolicy | Layout attribute describing horizontal and vertical resizing policy
QSlider | Vertical or horizontal slider
QSocketNotifier | Support for monitoring activity on a file descriptor
QSound | Access to the platform audio facilities
QSpacerItem | Blank space in a layout
QSpinBox | Spin box widget
QSplashScreen | Splash screen that can be shown during application startup
QSplitter | Implements a splitter widget
QSplitterHandle | Handle functionality of the splitter
QSqlDatabase | Represents a connection to a database
QSqlDriver | Abstract base class for accessing specific SQL databases
QSqlDriverCreator | Template class that provides a SQL driver factory for a specific driver type
QSqlDriverCreatorBase | The base class for SQL driver factories
QSqlDriverPlugin | Abstract base for custom QSqlDriver plugins
QSqlError | SQL database error information
QSqlField | Manipulates the fields in SQL database tables and views
QSqlIndex | Functions to manipulate and describe database indexes
QSqlQuery | Means of executing and manipulating SQL statements
QSqlQueryModel | Read-only data model for SQL result sets
QSqlRecord | Encapsulates a database record
QSqlRelation | Stores information about an SQL foreign key
QSqlRelationalDelegate
QSqlRelationalTableModel | Editable data model for a single database table, with foreign key support
QSqlResult | Abstract interface for accessing data from specific SQL databases
QSqlTableModel | Editable data model for a single database table
QStack | Template class that provides a stack
QStackedLayout | Maintains a stack of widgets where only the top widget is visible
QStackedWidget | Stack of widgets where only the top widget is visible
QStandardItemModel
QStatusBar | Horizontal bar suitable for presenting status information
QString | Unicode character string
QStringList | List of strings
QStyle | Abstract base class that encapsulates the look and feel of a GUI
QStyleFactory | Creates QStyle objects
QStyleHintReturn
QStyleOption | Stores the parameters used by QStyle functions
QStyleOptionButton | Used to describe the parameters for drawing buttons
QStyleOptionComboBox | Used to describe the parameter for drawing a combobox
QStyleOptionComplex | Used to hold parameters that are common to all complex controls
QStyleOptionDockWidget | Used to describe the parameters for drawing a dock window
QStyleOptionFocusRect | Used to describe the parameters for drawing a focus rectangle with QStyle
QStyleOptionFrame | Used to describe the parameters for drawing a frame
QStyleOptionHeader | Used to describe the parameters for drawing a header
QStyleOptionMenuItem | Used to describe the parameter necessary for drawing a menu item
QStyleOptionProgressBar | Used to describe the parameters necessary for drawing a progress bar
QStyleOptionQ3DockWindow | Used to describe the parameters for drawing various parts of
QStyleOptionQ3ListView | Used to describe the parameters for drawing a Q3ListView
QStyleOptionQ3ListViewItem | Used to describe an item drawn in a Q3ListView
QStyleOptionSlider | Used to describe the parameters needed for drawing a slider
QStyleOptionSpinBox | Used to describe the parameters necessary for drawing a spin box
QStyleOptionTab | Used to describe the parameters for drawing a tab bar
QStyleOptionTitleBar | Used to describe the parameters for drawing a title bar
QStyleOptionToolBox | Used to describe the parameters needed for drawing a tool box
QStyleOptionToolButton | Used to describe the parameters for drawing a tool button
QStyleOptionViewItem | Used to describe the parameters used to draw an item in a view widget
QStylePainter | Convenience class for drawing QStyle elements inside a widget
QStylePlugin | Abstract base for custom QStyle plugins
QTabBar | Tab bar, e.g. for use in tabbed dialogs
QTabWidget | Stack of tabbed widgets
QTableView | Default model/view implementation of a table view
QTableWidget | Item-based table view with a default model
QTableWidgetItem | Item for use with the QTableWidget class
QTableWidgetSelectionRange
QTabletEvent | Parameters that describe a Tablet event
QTcpServer | TCP-based server
QTcpSocket | TCP socket
QTemporaryFile | I/O device that operates on temporary files
QTextBlock | Container for text fragments in a QTextDocument
QTextBlockFormat | Formatting information for blocks of text in a QTextDocument
QTextBlockGroup | Container for text blocks within a QTextDocument
QTextBrowser | Rich text browser with hypertext navigation
QTextCharFormat | Formatting information for characters in a QTextDocument
QTextCodec | Conversions between text encodings
QTextCodecPlugin | Abstract base for custom QTextCodec plugins
QTextCursor | Offers an API to access and modify QTextDocuments
QTextDecoder | State-based decoder
QTextDocument | Holds formatted text that can be viewed and edited using a QTextEdit
QTextDocumentFragment | Represents a piece of formatted text from a QTextDocument
QTextEdit | Widget that is used to edit and display both plain and rich text
QTextEncoder | State-based encoder
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 QTextLayout
QTextLayout | Used to lay out and paint a single paragraph of text
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
QTextOption | Description of general rich text properties
QTextStream | Convenient interface for reading and writing text
QTextTable | Represents a table in a QTextDocument
QTextTableCell | Represents the properties of a cell in a QTextTable
QTextTableFormat | Formatting information for tables in a QTextDocument
QThread | Platform-independent threads
QThreadStorage | Per-thread data storage
QTime | Clock time functions
QTimer | Repetitive and single-shot timers
QTimerEvent | Parameters that describe a timer event
QToolBar | Movable panel that contains a set of controls
QToolBarChangeEvent | Event that is sent whenever a the toolbar button is clicked on Mac OS X
QToolBox | Column of tabbed widget items
QToolButton | Quick-access button to commands or options, usually used inside a QToolBar
QToolTip | Tool tips (balloon help) for any widget
QTranslator | Internationalization support for text output
QTranslatorMessage | Translator message and its properties
QTreeView | Default model/view implementation of a tree view
QTreeWidget | Tree view that uses a predefined tree model
QTreeWidgetItem | Item for use with the QTreeWidget convenience class
QTsciiCodec | Conversion to and from the Tamil TSCII encoding
QUdpSocket | UDP socket
QUrl | Convenient interface for working with URLs
QUrlInfo | Stores information about URLs
QUuid | Defines a Universally Unique Identifier (UUID)
QVBoxLayout | Lines up widgets vertically
QVBoxWidget | Vertical geometry management of its child widgets
QValidator | Validation of input text
QVarLengthArray | Low-level variable-length array
QVariant | Acts like a union for the most common Qt data types
QVector | Template class that provides a dynamic array
QVectorIterator | Java-style const iterator for QVector and QStack
QWSInputMethod | International input methods for Qt/Embedded
QWSKeyboardHandler | Implements the keyboard driver for Qt/Embedded
QWSMouseHandler | Mouse driver for Qt/Embedded
QWSServer | Server-specific functionality in Qt/Embedded
QWSWindow | Server-specific functionality in Qt/Embedded
QWaitCondition | Condition variable for synchronizing threads
QWhatsThis | Simple description of any widget, i.e. answering the question "What's this?"
QWhatsThisAction | Ready-made action to invoke "What's This" context help
QWheelEvent | Parameters that describe a wheel event
QWidget | The base class of all user interface objects
QWidgetContainerPlugin | Abstract base for complex custom container QWidget plugins
QWidgetItem | Layout item that represents a widget
QWidgetPlugin | Abstract base for custom QWidget plugins
QWindowsMime | Maps open-standard MIME to Window Clipboard formats
QWindowsStyle | Microsoft Windows-like look and feel
QWindowsXPStyle | Microsoft WindowsXP-like look and feel
QWriteLocker | Convenience class that simplifies locking and unlocking read-write locks for write access
QX11Info | Information about the X display configuration
QXmlAttributes | XML attributes
QXmlContentHandler | Interface to report the logical content of XML data
QXmlDTDHandler | Interface to report DTD content of XML data
QXmlDeclHandler | Interface to report declaration content of XML data
QXmlDefaultHandler | Default implementation of all the XML handler classes
QXmlEntityResolver | Interface to resolve external entities contained in XML data
QXmlErrorHandler | Interface to report errors in XML data
QXmlInputSource | The input data for the QXmlReader subclasses
QXmlLexicalHandler | Interface to report the lexical content of XML data
QXmlLocator | The XML handler classes with information about the parsing position within a file
QXmlNamespaceSupport | Helper class for XML readers which want to include namespace support
QXmlParseException | Used to report errors with the QXmlErrorHandler interface
QXmlReader | Interface for XML readers (i.e. parsers)
QXmlSimpleReader | Implementation of a simple XML parser