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Qt's Classes

For a shorter list that only includes the most frequently used classes, see Qt's Main Classes.

A	QAccel		QDockArea		QIconViewItem		QPNGImagePacker		QTab
	QAccessible		QDockWindow		QImage		QPoint		QTabBar
	QAccessibleInterface		QDomAttr		QImageConsumer		QPointArray		QTabDialog
	QAccessibleObject		QDomCDATASection		QImageDecoder		QPopupMenu		QTable
	QAction		QDomCharacterData		QImageDrag		QPrinter		QTableItem
	QActionGroup		QDomComment		QImageFormat		QProcess		QTableSelection
	QApplication		QDomDocument		QImageFormatPlugin		QProgressBar		QTabletEvent
	QAsciiCache		QDomDocumentFragment		QImageFormatType		QProgressDialog		QTabWidget
	QAsciiCacheIterator		QDomDocumentType		QImageIO		QPtrCollection		QTextBrowser
	QAsciiDict		QDomElement		QIMEvent		QPtrDict		QTextCodec
	QAsciiDictIterator		QDomEntity		QInputDialog		QPtrDictIterator		QTextCodecPlugin
	QAssistantClient		QDomEntityReference		QIntCache		QPtrList		QTextDecoder
B	QBig5Codec		QDomImplementation		QIntCacheIterator		QPtrListIterator		QTextDrag
	QBig5hkscsCodec		QDomNamedNodeMap		QIntDict		QPtrQueue		QTextEdit
	QBitArray		QDomNode		QIntDictIterator		QPtrStack		QTextEncoder
	QBitmap		QDomNodeList		QIntValidator		QPtrVector		QTextIStream
	QBitVal		QDomNotation		QIODevice		QPushButton		QTextOStream
	QBoxLayout		QDomProcessingInstruction	J	QJisCodec	R	QRadioButton		QTextStream
	QBrush		QDomText	K	QKbdDriverFactory		QRangeControl		QThread
	QBuffer		QDoubleValidator		QKbdDriverPlugin		QRect		QTime
	QButton		QDragEnterEvent		QKeyEvent		QRegExp		QTimeEdit
	QButtonGroup		QDragLeaveEvent		QKeySequence		QRegExpValidator		QTimer
	QByteArray		QDragMoveEvent	L	QLabel		QRegion		QTimerEvent
C	QCache		QDragObject		QLayout		QResizeEvent		QToolBar
	QCacheIterator		QDropEvent		QLayoutItem	S	QScreen		QToolButton
	QCanvas	E	QEditorFactory		QLayoutIterator		QScrollBar		QToolTip
	QCanvasEllipse		QErrorMessage		QLCDNumber		QScrollView		QToolTipGroup
	QCanvasItem		QEucJpCodec		QLibrary		QSemaphore		QTranslator
	QCanvasItemList		QEucKrCodec		QLineEdit		QServerSocket		QTranslatorMessage
	QCanvasLine		QEvent		QListBox		QSessionManager		QTsciiCodec
	QCanvasPixmap		QEventLoop		QListBoxItem		QSettings	U	QUriDrag
	QCanvasPixmapArray	F	QFile		QListBoxPixmap		QSGIStyle		QUrl
	QCanvasPolygon		QFileDialog		QListBoxText		QShowEvent		QUrlInfo
	QCanvasPolygonalItem		QFileIconProvider		QListView		QSignal		QUrlOperator
	QCanvasRectangle		QFileInfo		QListViewItem		QSignalMapper	V	QValidator
	QCanvasSpline		QFilePreview		QListViewItemIterator		QSimpleRichText		QValueList
	QCanvasSprite		QFocusData		QLocalFs		QSize		QValueListConstIterator
	QCanvasText		QFocusEvent	M	QMacStyle		QSizeGrip		QValueListIterator
	QCanvasView		QFont		QMainWindow		QSizePolicy		QValueStack
	QCDEStyle		QFontDatabase		QMap		QSjisCodec		QValueVector
	QChar		QFontDialog		QMapConstIterator		QSlider		QVariant
	QCharRef		QFontInfo		QMapIterator		QSocket		QVBox
	QCheckBox		QFontManager		QMemArray		QSocketDevice		QVBoxLayout
	QCheckListItem		QFontMetrics		QMenuBar		QSocketNotifier		QVButtonGroup
	QCheckTableItem		QFrame		QMenuData		QSound		QVGroupBox
	QChildEvent		QFtp		QMessageBox		QSpacerItem	W	QWaitCondition
	QClipboard	G	QGb18030Codec		QMetaObject		QSpinBox		QWhatsThis
	QCloseEvent		QGb2312Codec		QMetaProperty		QSplitter		QWheelEvent
	QColor		QGbkCodec		QMimeSource		QSql		QWidget
	QColorDialog		QGfxDriverFactory		QMimeSourceFactory		QSqlCursor		QWidgetFactory
	QColorDrag		QGfxDriverPlugin		QMotifPlusStyle		QSqlDatabase		QWidgetItem
	QColorGroup		QGL		QMotifStyle		QSqlDriver		QWidgetPlugin
	QComboBox		QGLayoutIterator		QMouseDriverFactory		QSqlDriverPlugin		QWidgetStack
	QComboTableItem		QGLColormap		QMouseDriverPlugin		QSqlEditorFactory		QWindowsMime
	QCommonStyle		QGLContext		QMouseEvent		QSqlError		QWindowsStyle
	QConstString		QGLFormat		QMoveEvent		QSqlField		QWizard
	QContextMenuEvent		QGLWidget		QMovie		QSqlFieldInfo		QWMatrix
	QCopChannel		QGrid		QMutex		QSqlForm		QWorkspace
	QCString		QGridLayout		QMutexLocker		QSqlIndex		QWSDecoration
	QCursor		QGridView	N	QNetworkOperation		QSqlPropertyMap		QWSInputMethod
	QCustomEvent		QGroupBox		QNetworkProtocol		QSqlQuery		QWSKeyboardHandler
	QCustomMenuItem		QGuardedPtr		QNPInstance *		QSqlRecord		QWSMouseHandler
D	QDataBrowser	H	QHBox		QNPlugin *		QSqlRecordInfo		QWSServer
	QDataStream		QHBoxLayout		QNPStream *		QSqlResult		QWSWindow
	QDataTable		QHButtonGroup		QNPWidget *		QStatusBar	X	QXmlAttributes
	QDataView		QHeader	O	QObject		QStoredDrag		QXmlContentHandler
	QDate		QHebrewCodec		QObjectCleanupHandler		QStrIList		QXmlDeclHandler
	QDateEdit		QHGroupBox		QObjectList		QString		QXmlDefaultHandler
	QDateTime		QHideEvent	P	QPaintDevice		QStringList		QXmlDTDHandler
	QDateTimeEdit		QHostAddress		QPaintDeviceMetrics		QStrList		QXmlEntityResolver
	QDeepCopy		QHttp		QPainter		QStrListIterator		QXmlErrorHandler
	QDesktopWidget		QHttpHeader		QPaintEvent		QStyle		QXmlInputSource
	QDial		QHttpRequestHeader		QPair		QStyleFactory		QXmlLexicalHandler
	QDialog		QHttpResponseHeader		QPalette		QStyleOption		QXmlLocator
	QDict	I	QIconDrag		QPen		QStylePlugin		QXmlNamespaceSupport
	QDictIterator		QIconDragItem		QPicture		QStyleSheet		QXmlParseException
	QDir		QIconFactory		QPixmap		QStyleSheetItem		QXmlReader
	QDirectPainter		QIconSet		QPixmapCache		QSyntaxHighlighter		QXmlSimpleReader
	QDns		QIconView		QPlatinumStyle	T	Qt

* Extension classes of Netscape.