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

* Extension classes of Motif.