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# Annotated Class Index

Here are the classes in Qt, with brief descriptions:

QAccel | Handles keyboard accelerator and shortcut keys
QAccessible | Enums and static functions relating to accessibility
QAccessibleInterface | Defines an interface that exposes information about accessible objects
QAccessibleObject | Implements parts of the QAccessibleInterface for QObjects
QAction | Abstract user interface action that can appear both in menus and tool bars
QActionGroup | Groups actions together
QApplication | Manages the GUI application's control flow and main settings
QAsciiCache | Template class that provides a cache based on char* keys
QAsciiCacheIterator | Iterator for QAsciiCache collections
QAsciiDict | Template class that provides a dictionary based on char* keys
QAsciiDictIterator | Iterator for QAsciiDict collections
QBitArray | Array of bits
QBitVal | Internal class, used with QBitArray
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 | I/O device that operates on a QByteArray
QButton | The abstract base class of button widgets, providing functionality common to buttons
QButtonGroup | Organizes QButton widgets in a group
QByteArray | Array of bytes
QCDEStyle | CDE look and feel
QCString | Abstraction of the classic C zero-terminated char array (char *)
QCache | Template class that provides a cache based on QString keys
QCacheIterator | Iterator for QCache collections
QCanvas | 2D area that can contain QCanvasItem objects
QCanvasEllipse | Ellipse or ellipse segment on a QCanvas
QCanvasItem | Abstract graphic object on a QCanvas
QCanvasItemList | List of QCanvasItems
QCanvasLine | Line on a QCanvas
QCanvasPixmap | Pixmap in a QCanvas
QCanvasPixmapArray | Array of QCanvasPixmaps
QCanvasPolygon | Polygon on a QCanvas
QCanvasPolygonalItem | Polygonal canvas item on a QCanvas
QCanvasRectangle | Rectangle on a QCanvas
QCanvasSpline | Multi-bezier splines on a QCanvas
QCanvasSprite | Animated canvas item on a QCanvas
QCanvasText | Text object on a QCanvas
QCanvasView | On-screen view of a QCanvas
QChar | Lightweight Unicode character
QCharRef | Helper class for QString
QCheckBox | Checkbox with a text label
QCheckListItem | Checkable list view items
QCheckTableItem | Checkboxes in QTables
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
QColorDialog | Dialog widget for specifying colors
QColorDrag | Drag and drop object for transferring colors
QColorGroup | Group of widget colors
QComboBox | Combined button and popup list
QComboTableItem | Means of using comboboxes in QTables
QCommonStyle | Encapsulates the common Look and Feel of a GUI
QConstString | String objects using constant Unicode data
QContextMenuEvent | Parameters that describe a context menu event
QCopChannel | Communication capabilities between several clients
QCursor | Mouse cursor with an arbitrary shape
QCustomEvent | Support for custom events
QCustomMenuItem | Abstract base class for custom menu items in popup menus
QDataBrowser | Data manipulation and navigation for data entry forms
QDataStream | Serialization of binary data to a QIODevice
QDataTable | Flexible SQL table widget that supports browsing and editing
QDataView | Read-only SQL forms
QDate | Date functions
QDateEdit | Date editor
QDateTime | Date and time functions
QDateTimeEdit | Combines a QDateEdit and QTimeEdit widget into a single widget for editing datetimes
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
QDict | Template class that provides a dictionary based on QString keys
QDictIterator | Iterator for QDict collections
QDir | Access to directory structures and their contents in a platform-independent way
QDns | Asynchronous DNS lookups
QDockArea | Manages and lays out QDockWindows
QDockWindow | Widget which can be docked inside a QDockArea 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
QDoubleValidator | Range checking of floating-point numbers
QDragEnterEvent | Event which is sent to the widget when a drag and drop first drags onto the widget
QDragLeaveEvent | Event which is sent to the widget when a drag and drop leaves the widget
QDragMoveEvent | Event which is sent while a drag-and-drop is in progress
QDragObject | Encapsulates MIME-based data transfer
QDropEvent | Event which is sent when a drag and drop is completed
QEditorFactory | Used to create editor widgets for QVariant data types
QErrorMessage | Error message display dialog
QEucJpCodec | Conversion to and from EUC-JP character sets
QEucKrCodec | Conversion to and from EUC-KR character sets
QEvent | The base class of all event classes. Event objects contain event parameters
QFile | I/O device that operates on files
QFileDialog | Dialogs that allow users to select files or directories
QFileIconProvider | Icons for QFileDialog to use
QFileInfo | System-independent file information
QFilePreview | File previewing in QFileDialog
QFocusData | Maintains the list of widgets in the focus chain
QFocusEvent | Event parameters for widget focus events
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
QFontManager | Implements font management in Qt/Embedded
QFontMetrics | Font metrics information
QFrame | The base class of widgets that can have a frame
QFtp | Implementation of the FTP protocol
QGL | Namespace for miscellaneous identifiers in the Qt OpenGL module
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
QGLayoutIterator | Abstract base class of internal layout iterators
QGbkCodec | Conversion to and from the Chinese GBK encoding
QGrid | Simple geometry management of its children
QGridLayout | Lays out widgets in a grid
QGridView | Abstract base for fixed-size grids
QGroupBox | Group box frame with a title
QGuardedPtr | Template class that provides guarded pointers to QObjects
QHBox | Horizontal geometry management for its children
QHBoxLayout | Lines up widgets horizontally
QHButtonGroup | Organizes QButton widgets in a group with one horizontal row
QHGroupBox | Organizes widgets in a group with one horizontal row
QHeader | Header row or column, e.g. for tables and listviews
QHebrewCodec | Conversion to and from visually ordered Hebrew
QHideEvent | Event which is sent after a widget is hidden
QHostAddress | IP address
QHttp | Implementation of the HTTP protocol
QIMEvent | Parameters for input method events
QIODevice | The base class of I/O devices
QIconDrag | Supports drag and drop operations within a QIconView
QIconDragItem | Encapsulates a drag item
QIconSet | Set of icons with different styles and sizes
QIconView | Area with movable labelled icons
QIconViewItem | Single item in a QIconView
QImage | Hardware-independent pixmap representation with direct access to the pixel data
QImageConsumer | Abstraction used by QImageDecoder
QImageDecoder | Incremental image decoder for all supported image formats
QImageDrag | Drag and drop object for transferring images
QImageFormat | Incremental image decoder for a specific image format
QImageFormatPlugin | Abstract base for custom image format plugins
QImageFormatType | Factory that makes QImageFormat objects
QImageIO | Parameters for loading and saving images
QInputDialog | Simple convenience dialog to get a single value from the user
QIntCache | Template class that provides a cache based on long keys
QIntCacheIterator | Iterator for QIntCache collections
QIntDict | Template class that provides a dictionary based on long keys
QIntDictIterator | Iterator for QIntDict collections
QIntValidator | Validator which ensures that a string contains a valid integer within a specified range
QJisCodec | Conversion to and from JIS character sets
QKeyEvent | Describes a key event
QKeySequence | Encapsulates a key sequence as used by accelerators
QLCDNumber | Displays a number with LCD-like digits
QLabel | Text or image display
QLayout | The base class of geometry managers
QLayoutItem | Abstract item that a QLayout manipulates
QLayoutIterator | Iterators over QLayoutItem
QLibrary | Wrapper for handling shared libraries
QLineEdit | One-line text editor
QListBox | List of selectable, read-only items
QListBoxItem | The base class of all list box items
QListBoxPixmap | List box items with a pixmap and optional text
QListBoxText | List box items that display text
QListView | Implements a list/tree view
QListViewItem | Implements a list view item
QListViewItemIterator | Iterator for collections of QListViewItems
QLocalFs | Implementation of a QNetworkProtocol that works on the local file system
QLock | Wrapper round a System V shared semaphore
QMainWindow | Main application window, with a menu bar, dock windows (e.g. for toolbars), and a status bar
QMap | Value-based template class that provides a dictionary
QMapConstIterator | Iterator for QMap
QMapIterator | Iterator for QMap
QMemArray | Template class that provides arrays of simple types
QMenuBar | Horizontal menu bar
QMenuData | Base class for QMenuBar and QPopupMenu
QMessageBox | Modal dialog with a short message, an icon, and some buttons
QMetaObject | Meta information about Qt objects
QMetaProperty | Stores meta data about a property
QMimeSource | Abstraction of objects which provide formatted data of a certain MIME type
QMimeSourceFactory | Extensible provider of mime-typed data
QMotifPlusStyle | More sophisticated Motif-ish look and feel
QMotifStyle | Motif look and feel
QMouseEvent | Parameters that describe a mouse event
QMoveEvent | Event parameters for move events
QMovie | Incremental loading of animations or images, signalling as it progresses
QMutex | Access serialization between threads
QNPInstance | QObject that is a Web-browser plugin
QNPStream | Stream of data provided to a QNPInstance by the browser
QNPWidget | QWidget that is a Web-browser plugin window
QNPlugin | The plugin central factory
QNetworkOperation | Common operations for network protocols
QNetworkProtocol | Common API for network protocols
QObject | The base class of all Qt objects
QObjectCleanupHandler | Watches the lifetime of multiple QObjects
QPNGImagePacker | Creates well-compressed PNG animations
QPaintDevice | The base class of objects that can be painted
QPaintDeviceMetrics | Information about a paint device
QPaintEvent | Event parameters for paint events
QPainter | Does low-level painting e.g. on widgets
QPair | Value-based template class that provides a pair of elements
QPalette | Color groups for each widget state
QPen | Defines how a QPainter should draw lines and outlines of shapes
QPicture | Paint device that records and replays QPainter commands
QPixmap | Off-screen, pixel-based paint device
QPixmapCache | Application-global cache for pixmaps
QPlatinumStyle | Mac/Platinum look and feel
QPoint | Defines a point in the plane
QPointArray | Array of points
QPopupMenu | Popup menu widget
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
QPtrCollection | The base class of most pointer-based Qt collections
QPtrDict | Template class that provides a dictionary based on void* keys
QPtrDictIterator | Iterator for QPtrDict collections
QPtrList | Template class that provides doubly-linked lists
QPtrListIterator | Iterator for QPtrList collections
QPtrQueue | Template class that provides a queue
QPtrStack | Template class that provides a stack
QPtrVector | Template collection class that provides a vector (array)
QPushButton | Command button
QRadioButton | Radio button with a text or pixmap label
QRangeControl | Integer value within a range
QRect | Defines a rectangle in the plane
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
QSGIStyle | SGI/Irix look and feel
QScreen | And its descendants manage the framebuffer and palette
QScrollBar | Vertical or horizontal scroll bar
QScrollView | Scrolling area with on-demand scroll bars
QSemaphore | Robust integer semaphore
QServerSocket | TCP-based server
QSessionManager | Access to the session manager
QSettings | Persistent platform-independent application settings
QShowEvent | Event which is sent when a widget is shown
QSignal | Can be used to send signals for classes that don't inherit QObject
QSignalMapper | Bundles signals from identifiable senders
QSimpleRichText | Small displayable piece of rich text
QSize | Defines the size of a two-dimensional object
QSizeGrip | Corner-grip for resizing a top-level window
QSizePolicy | Layout attribute describing horizontal and vertical resizing
QSjisCodec | Conversion to and from Shift-JIS
QSlider | Vertical or horizontal slider
QSocket | Buffered TCP connection
QSocketDevice | Platform-independent low-level socket API
QSocketNotifier | Support for socket callbacks
QSound | Access to the platform audio facilities
QSpacerItem | Blank space in a layout
QSpinBox | Spin box widget (spin button)
QSplitter | Implements a splitter widget
QSql | Namespace for Qt SQL identifiers that need to be global-like
QSqlCursor | Browsing and editing of SQL tables and views
QSqlDatabase | Used to create SQL database connections and provide transaction handling
QSqlDriver | Abstract base class for accessing SQL databases
QSqlDriverPlugin | Abstract base for custom QSqlDriver plugins
QSqlEditorFactory | Used to create the editors used by QDataTable and QSqlForm
QSqlError | SQL database error information
QSqlField | Manipulates the fields in SQL database tables and views
QSqlFieldInfo | Stores meta data associated with a SQL field
QSqlForm | Creates and manages data entry forms tied to SQL databases
QSqlIndex | Functions to manipulate and describe QSqlCursor and QSqlDatabase indexes
QSqlPropertyMap | Used to map widgets to SQL fields
QSqlQuery | Means of executing and manipulating SQL statements
QSqlRecord | Encapsulates a database record, i.e. a set of database fields
QSqlRecordInfo | Encapsulates a set of database field meta data
QSqlResult | Abstract interface for accessing data from SQL databases
QStatusBar | Horizontal bar suitable for presenting status information
QStoredDrag | Simple stored-value drag object for arbitrary MIME data
QStrIList | Doubly-linked list of char* with case-insensitive comparison
QStrList | Doubly-linked list of char*
QStrListIterator | Iterator for the QStrList and QStrIList classes
QString | Abstraction of Unicode text and the classic C null-terminated char array
QStringList | List of strings
QStyle | The look and feel of a GUI
QStyleFactory | Creates QStyle objects
QStyleOption | Optional parameters for QStyle functions
QStylePlugin | Abstract base for custom QStyle plugins
QStyleSheet | Collection of styles for rich text rendering and a generator of tags
QStyleSheetItem | Encapsulation of a set of text styles
QTab | The structures in a QTabBar
QTabBar | Tab bar, e.g. for use in tabbed dialogs
QTabDialog | Stack of tabbed widgets
QTabWidget | Stack of tabbed widgets
QTable | Flexible editable table widget
QTableItem | The cell content for QTable cells
QTableSelection | Access to a selected area in a QTable
QTabletEvent | Parameters that describe a Tablet event
QTextBrowser | Rich text browser with hypertext navigation
QTextCodec | Conversion between text encodings
QTextCodecPlugin | Abstract base for custom QTextCodec plugins
QTextDecoder | State-based decoder
QTextDrag | Drag and drop object for transferring plain and Unicode text
QTextEdit | Sophisticated single-page rich text editor
QTextEncoder | State-based encoder
QTextIStream | Convenience class for input streams
QTextOStream | Convenience class for output streams
QTextStream | Basic functions for reading and writing text using a QIODevice
QThread | Platform-independent threads
QTime | Clock time functions
QTimeEdit | Time editor
QTimer | Timer signals and single-shot timers
QTimerEvent | Parameters that describe a timer event
QToolBar | Movable panel containing widgets such as tool buttons
QToolButton | Quick-access button to commands or options, usually used inside a QToolBar
QToolTip | Tool tips (balloon help) for any widget or rectangular part of a widget
QToolTipGroup | Collects tool tips into related groups
QTranslator | Internationalization support for text output
QTranslatorMessage | Translator message and its properties
QTsciiCodec | Conversion to and from the Tamil TSCII encoding
QUriDrag | Drag object for a list of URI references
QUrl | URL parser and simplifies working with URLs
QUrlInfo | Stores information about URLs
QUrlOperator | Common operations on URLs
QVBox | Vertical geometry management on its children
QVBoxLayout | Lines up widgets vertically
QVButtonGroup | Organizes QButton widgets in a vertical column
QVGroupBox | Organizes a group of widgets in a vertical column
QValidator | Validation of input text
QValueList | Value-based template class that provides doubly linked lists
QValueListConstIterator | Const iterator for QValueList
QValueListIterator | Iterator for QValueList
QValueStack | Value-based template class that provides a stack
QValueVector | Value-based template class that provides a dynamic array
QVariant | Acts like a union for the most common Qt data types
QWMatrix | 2D transformations of a coordinate system
QWSDecoration | Allows the appearance of the Qt/Embedded Window Manager to be customized
QWSKeyboardHandler | Implements the keyboard driver/handler for Qt/Embedded
QWSMouseHandler | Mouse driver/handler for Qt/Embedded
QWSServer | Server-specific functionality in Qt/Embedded
QWSWindow | Server-specific functionality in Qt/Embedded
QWaitCondition | Allows waiting/waking for conditions between threads
QWhatsThis | Simple description of any widget, i.e. answering the question "What's this?"
QWheelEvent | Parameters that describe a wheel event
QWidget | The base class of all user interface objects
QWidgetFactory | For the dynamic creation of widgets from Qt Designer .ui files
QWidgetItem | Layout item that represents a widget
QWidgetPlugin | Abstract base for custom QWidget plugins
QWidgetStack | Stack of widgets of which only the top widget is user-visible
QWindowsMime | Maps open-standard MIME to Window Clipboard formats
QWindowsStyle | Microsoft Windows-like look and feel
QWizard | Framework for wizard dialogs
QWorkspace | Workspace window that can contain decorated windows, e.g. for MDI
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 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 reader (parser)
QXtApplication | Facilitates the mixing of Xt/Motif and Qt widgets
QXtWidget | Allows mixing of Xt/Motif and Qt widgets
Qt | Namespace for miscellaneous identifiers that need to be global-like