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Qt's Classes

This is a list of all Qt classes excluding the Qt 3 compatibility classes. For a shorter list that only includes the most frequently used classes, see Qt's Main Classes.

A	QAbstractButton		QDomCharacterData		QLatin1String	S	QScreen		QTableWidgetItem
	QAbstractEventDispatcher		QDomComment		QLayout		QScreenDriverFactory		QTableWidgetSelectionRange
	QAbstractExtensionFactory		QDomDocument		QLayoutItem		QScreenDriverPlugin		QTabWidget
	QAbstractExtensionManager		QDomDocumentFragment		QLCDNumber		QScrollArea		QTcpServer
	QAbstractFileEngine		QDomDocumentType		QLibrary		QScrollBar		QTcpSocket
	QAbstractFileEngineHandler		QDomElement		QLibraryInfo		QSemaphore		QTemporaryFile
	QAbstractFormBuilder		QDomEntity		QLine		QSessionManager		QTestEventList
	QAbstractItemDelegate		QDomEntityReference		QLinearGradient		QSet		QTextBlock
	QAbstractItemModel		QDomImplementation		QLineEdit		QSetIterator		QTextBlockFormat
	QAbstractItemView		QDomNamedNodeMap		QLineF		QSettings		QTextBlockGroup
	QAbstractListModel		QDomNode		QLinkedList		QSharedData		QTextBlockUserData
	QAbstractPrintDialog		QDomNodeList		QLinkedListIterator		QSharedDataPointer		QTextBrowser
	QAbstractProxyModel		QDomNotation		QList		QShortcut		QTextCharFormat
	QAbstractScrollArea		QDomProcessingInstruction		QListIterator		QShortcutEvent		QTextCodec
	QAbstractSlider		QDomText		QListView		QShowEvent		QTextCodecPlugin
	QAbstractSocket		QDoubleSpinBox		QListWidget		QSignalMapper		QTextCursor
	QAbstractSpinBox		QDoubleValidator		QListWidgetItem		QSignalSpy		QTextDecoder
	QAbstractTableModel		QDrag		QLocale		QSize		QTextDocument
	QAbstractTextDocumentLayout		QDragEnterEvent	M	QMacMime		QSizeF		QTextDocumentFragment
	QAccessible		QDragLeaveEvent		QMacStyle		QSizeGrip		QTextEdit
	QAccessibleBridge		QDragMoveEvent		QMainWindow		QSizePolicy		QTextEncoder
	QAccessibleBridgePlugin		QDropEvent		QMap		QSlider		QTextFormat
	QAccessibleEvent	E	QErrorMessage		QMapIterator		QSocketNotifier		QTextFragment
	QAccessibleInterface		QEvent		QMatrix		QSortFilterProxyModel		QTextFrame
	QAccessibleObject		QEventLoop		QMenu		QSound		QTextFrameFormat
	QAccessiblePlugin		QExtensionFactory		QMenuBar		QSpacerItem		QTextImageFormat
	QAccessibleWidget		QExtensionManager		QMessageBox		QSpinBox		QTextInlineObject
	QAction	F	QFile		QMetaClassInfo		QSplashScreen		QTextLayout
	QActionEvent		QFileDialog		QMetaEnum		QSplitter		QTextLength
	QActionGroup		QFileIconProvider		QMetaMethod		QSplitterHandle		QTextLine
	QApplication		QFileInfo		QMetaObject		QSqlDatabase		QTextList
	QAssistantClient		QFileOpenEvent		QMetaProperty		QSqlDriver		QTextListFormat
	QAxAggregated		QFlag		QMetaType		QSqlDriverCreator		QTextObject
	QAxBase		QFlags		QMimeData		QSqlDriverCreatorBase		QTextOption
	QAxBindable		QFocusEvent		QMimeSource		QSqlDriverPlugin		QTextStream
	QAxFactory		QFocusFrame		QModelIndex		QSqlError		QTextTable
	QAxObject		QFont		QMotifStyle		QSqlField		QTextTableCell
	QAxScript		QFontDatabase		QMouseDriverFactory		QSqlIndex		QTextTableFormat
	QAxScriptEngine		QFontDialog		QMouseDriverPlugin		QSqlQuery		QThread
	QAxScriptManager		QFontInfo		QMouseEvent		QSqlQueryModel		QThreadStorage
	QAxWidget		QFontMetrics		QMoveEvent		QSqlRecord		QTime
B	QBasicTimer		QFontMetricsF		QMovie		QSqlRelation		QTimeEdit
	QBitArray		QFormBuilder		QMultiHash		QSqlRelationalDelegate		QTimer
	QBitmap		QFrame		QMultiMap		QSqlRelationalTableModel		QTimerEvent
	QBoxLayout		QFSFileEngine		QMutableHashIterator		QSqlResult		QToolBar
	QBrush		QFtp		QMutableLinkedListIterator		QSqlTableModel		QToolBox
	QBuffer	G	QGenericArgument		QMutableListIterator		QStack		QToolButton
	QButtonGroup		QGenericReturnArgument		QMutableMapIterator		QStackedLayout		QToolTip
	QByteArray		QGLColormap		QMutableVectorIterator		QStackedWidget		QTranslator
	QByteArrayMatcher		QGLContext		QMutex		QStandardItemModel		QTreeView
C	QCache		QGLFormat		QMutexLocker		QStatusBar		QTreeWidget
	QCDEStyle		QGLPixelBuffer	N	QNetworkProxy		QStatusTipEvent		QTreeWidgetItem
	QChar		QGLWidget	O	QObject		QString	U	QUdpSocket
	QCheckBox		QGradient		QObjectCleanupHandler		QStringList		QUiLoader
	QChildEvent		QGridLayout	P	QPageSetupDialog		QStringListModel		QUrl
	QClipboard		QGroupBox		QPaintDevice		QStringMatcher		QUrlInfo
	QCloseEvent	H	QHash		QPaintEngine		QStyle		QUuid
	QColor		QHashIterator		QPaintEngineState		QStyleFactory	V	QValidator
	QColorDialog		QHBoxLayout		QPainter		QStyleHintReturn		QVariant
	QColormap		QHeaderView		QPainterPath		QStyleHintReturnMask		QVarLengthArray
	QComboBox		QHelpEvent		QPainterPathStroker		QStyleOption		QVBoxLayout
	QCommonStyle		QHideEvent		QPaintEvent		QStyleOptionButton		QVector
	QConicalGradient		QHostAddress		QPair		QStyleOptionComboBox		QVectorIterator
	QContextMenuEvent		QHostInfo		QPalette		QStyleOptionComplex	W	QWaitCondition
	QCopChannel		QHoverEvent		QPen		QStyleOptionDockWidget		QWhatsThis
	QCoreApplication		QHttp		QPersistentModelIndex		QStyleOptionFocusRect		QWhatsThisClickedEvent
	QCursor		QHttpHeader		QPicture		QStyleOptionFrame		QWheelEvent
D	QDataStream		QHttpRequestHeader		QPictureFormatPlugin		QStyleOptionFrameV2		QWidget
	QDate		QHttpResponseHeader		QPictureIO		QStyleOptionGroupBox		QWidgetItem
	QDateEdit	I	QIcon		QPixmap		QStyleOptionHeader		QWindowsMime
	QDateTime		QIconDragEvent		QPixmapCache		QStyleOptionMenuItem		QWindowsStyle
	QDateTimeEdit		QIconEngine		QPlastiqueStyle		QStyleOptionProgressBar		QWindowStateChangeEvent
	QDecoration		QIconEnginePlugin		QPluginLoader		QStyleOptionProgressBarV2		QWindowsXPStyle
	QDecorationFactory		QImage		QPoint		QStyleOptionQ3DockWindow		QWorkspace
	QDecorationPlugin		QImageIOHandler		QPointer		QStyleOptionQ3ListView		QWriteLocker
	QDesignerActionEditorInterface		QImageIOPlugin		QPointF		QStyleOptionQ3ListViewItem		QWSInputMethod
	QDesignerContainerExtension		QImageReader		QPolygon		QStyleOptionRubberBand		QWSKeyboardHandler
	QDesignerCustomWidgetCollectionInterface		QImageWriter		QPolygonF		QStyleOptionSlider		QWSMouseHandler
	QDesignerCustomWidgetInterface		QInputContext		QPrintDialog		QStyleOptionSpinBox		QWSServer
	QDesignerFormEditorInterface		QInputContextFactory		QPrintEngine		QStyleOptionTab		QWSWindow
	QDesignerFormWindowCursorInterface		QInputContextPlugin		QPrinter		QStyleOptionTabBarBase	X	QX11EmbedContainer
	QDesignerFormWindowInterface		QInputDialog		QProcess		QStyleOptionTabV2		QX11EmbedWidget
	QDesignerFormWindowManagerInterface		QInputEvent		QProgressBar		QStyleOptionTabWidgetFrame		QX11Info
	QDesignerMemberSheetExtension		QInputMethodEvent		QProgressDialog		QStyleOptionTitleBar		QXmlAttributes
	QDesignerObjectInspectorInterface		QIntValidator		QProxyModel		QStyleOptionToolBar		QXmlContentHandler
	QDesignerPropertyEditorInterface		QIODevice		QPushButton		QStyleOptionToolBox		QXmlDeclHandler
	QDesignerPropertySheetExtension		QItemDelegate	Q	QQueue		QStyleOptionToolButton		QXmlDefaultHandler
	QDesignerTaskMenuExtension		QItemEditorCreatorBase	R	QRadialGradient		QStyleOptionViewItem		QXmlDTDHandler
	QDesignerWidgetBoxInterface		QItemEditorFactory		QRadioButton		QStylePainter		QXmlEntityResolver
	QDesktopWidget		QItemSelection		QReadLocker		QStylePlugin		QXmlErrorHandler
	QDial		QItemSelectionModel		QReadWriteLock		QSvgRenderer		QXmlInputSource
	QDialog		QItemSelectionRange		QRect		QSvgWidget		QXmlLexicalHandler
	QDir	K	QKbdDriverFactory		QRectF		QSyntaxHighlighter		QXmlLocator
	QDirectPainter		QKbdDriverPlugin		QRegExp		QSysInfo		QXmlNamespaceSupport
	QDirModel		QKeyEvent		QRegExpValidator	T	QTabBar		QXmlParseException
	QDockWidget		QKeySequence		QRegion		QTabletEvent		QXmlReader
	QDomAttr	L	QLabel		QResizeEvent		QTableView		QXmlSimpleReader
	QDomCDATASection		QLatin1Char		QRubberBand		QTableWidget

See also Qt 3 Compatibility Classes and Qt's Modules.