Annotated Class Index

Here are the classes in Qt, with brief descriptions:

QAccel	Handles keyboard accelerator keys
QApplication	Manages the application event queue
QArray	Template class that provides arrays of simple types
QAsyncIO	Encapsulates I/O asynchronicity
QBitArray	Array of bits
QBitmap	Monochrome (1 bit depth) pixmaps
QBitVal	Internal class, used with QBitArray
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
QCache	Template class that provides a cache based on char* keys
QCacheIterator	Iterator for QCache collections
QCheckBox	Check box with a text label
QCheckListItem	Implements checkable list view items
QChildEvent	Event parameters for child widget events
QClipboard	Access to the window system clipboard
QCloseEvent	Parameters that describe a close event
QCollection	The base class of all Qt collections
QColor	Colors based on RGB
QColorGroup	Group of widget colors
QComboBox	Combined button and popup list
QConnection	Internal class, used in the signal/slot mechanism
QCursor	Mouse cursor with an arbitrary shape
QCustomEvent	Support for custom events
QDataPump	Moves data from a QDataSource to a QDataSink during event processing
QDataSink	A QDataSink is an asynchronous consumer of data
QDataSource	A QDataSource is an asynchronous producer of data
QDataStream	Basic functions for serialization of binary data to a QIODevice
QDate	Date functions
QDateTime	Combines QDate and QTime into a single class
QDialog	The base class of dialog windows
QDict	Template class that provides a dictionary based on char* keys
QDictIterator	Iterator for QDict collections
QDir	Traverses directory structures and contents in a platform-independent way
QDoubleValidator	Range checking of floating-point numbers
QDragMoveEvent	Event sent as a drag-and-drop is in progress
QDragObject	The QDragObject encapsulates MIME-based drag-and-drop interaction
QDropEvent	Event sent when a drag-and-drop is completed
QEvent	Base class of all event classes. Event objects contain event parameters
QFile	I/O device that operates on files
QFileDialog	The QFileDialog provides a dialog widget for inputting file names
QFileIconProvider	Icons for QFileDialog to use
QFileInfo	System-independent file information
QFocusData	Maintains the list of widgets which can take focus
QFocusEvent	Event parameters for widget focus events
QFont	Font used for drawing text
QFontInfo	General information about fonts
QFontMetrics	Font metrics information about fonts
QFrame	The base class of widgets that have an (optional) frame
QGArray	Internal class for implementing the QArray class
QGCache	Internal class for implementing QCache and QIntCache
QGCacheIterator	An internal class for implementing QCacheIterator and QIntCacheIterator
QGDict	Internal class for implementing QDict and QIntDict
QGDictIterator	An internal class for implementing QDictIterator and QIntDictIterator
QGIFFormat	Incremental image decoder for GIF image format
QGIFFormatType	Incremental image decoder for GIF image format
QGLContext	Encapsulates an OpenGL rendering context [Qt OpenGL Extension]
QGLFormat	The display format of an OpenGL rendering context [Qt OpenGL Extension]
QGList	Internal class for implementing Qt collection classes
QGListIterator	The QGListIterator is an internal class for implementing QListIterator
QGLWidget	Widget for rendering OpenGL graphics [Qt OpenGL Extension]
QGManager	One-dimensional geometry management
QGridLayout	Lays out child widgets in a grid
QGroupBox	Group box frame with a title
QHBoxLayout	Lines up child widgets horizontally
QHeader	Table header
QIconSet	Set of icons (normal, disabled, various sizes) for e.g. buttons
QImage	Hardware-independent pixmap representation with direct access to the pixel data
QImageConsumer	An abstraction used by QImageDecoder
QImageDecoder	Incremental image decoder for all supported image formats
QImageDrag	The QImageDrag provides a drag-and-drop object for tranferring images
QImageFormat	Incremental image decoder for a specific image format
QImageFormatType	Factory that makes QImageFormat objects
QImageIO	Parameters for loading and saving images
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	Range checking of integers
QIODevice	The base class of I/O devices
QIODeviceSource	A QIODeviceSource is a QDataSource that draws data from a QIODevice
QKeyEvent	Parameters that describe a key event
QLabel	Displays a static text or pixmap
QLayout	The base class of geometry specifiers
QLCDNumber	Displays a number with LCD-like digits
QLineEdit	Simple line editor for inputting text
QList	Template class that provides doubly linked lists
QListBox	Single-column list of items that can be scrolled
QListBoxItem	This is the base class of all list box items
QListBoxPixmap	List box items with a pixmap
QListBoxText	List box items with text
QListIterator	Iterator for QList collections
QListView	Implements a list/tree view
QListViewItem	Implements a list view item
QLNode	Internal class for the QList template collection
QMainWindow	Typical application window, with a menu bar, some tool bars and a status bar
QMenuBar	Horizontal menu bar
QMenuData	Base class for QMenuBar and QPopupMenu
QMessageBox	Displays a brief message, an icon, and some buttons
QMouseEvent	Parameters that describe a mouse event
QMoveEvent	Event parameters for move events
QMovie	Incrementally loads an animation or image, signalling as it progresses
QMultiLineEdit	Simple editor for inputting text
QNPInstance	A QObject that is a Web-browser plugin [Qt NSPlugin Extension]
QNPlugin	The plugin central factory [Qt NSPlugin Extension]
QNPStream	A stream of data provided to a QNPInstance by the browser [Qt NSPlugin Extension]
QNPWidget	A QWidget that is a Web-browser plugin window [Qt NSPlugin Extension]
QObject	The base class of all Qt objects that can deal with signals, slots and events
QPaintDevice	Of objects that can be painted
QPaintDeviceMetrics	Information about a paint device
QPainter	Paints on paint devices
QPaintEvent	Event parameters for paint events
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
QPoint	Defines a point in the plane
QPointArray	Array of points
QPointVal	Internal class, used with QPointArray
QPopupMenu	Popup menu widget
QPrintDialog	X-only dialog for specifying print-out details
QPrinter	Paint device that prints graphics on a printer
QProgressBar	Horizontal progress bar
QProgressDialog	Provides feedback on the progress of a slow operation
QPtrDict	Template class that provides a dictionary based on void* keys
QPtrDictIterator	Iterator for QPtrDict collections
QPushButton	Push button with a text or pixmap label
QQueue	Template class that provides a queue
QRadioButton	Radio button with a text label
QRangeControl	Integer value within a range
QRect	Defines a rectangle in the plane
QRegExp	Pattern matching using regular expressions and wildcards
QRegion	Clip region for a painter
QResizeEvent	Event parameters for resize events
QScrollBar	Vertical or horizontal scroll bar
QScrollView	Scrolling area with on-demand scrollbars
QSemiModal	The base class of semi-modal dialog windows
QShared	The QShared struct is internally used for implementing shared classes
QSignal	Can be used to send signals without parameters
QSignalMapper	A QSignalMapper object bundles signals from identifiable senders
QSize	Defines the size of a two-dimensional object
QSlider	Vertical or horizontal slider
QSocketNotifier	Support for socket callbacks
QSpinBox	Spin box widget, sometimes called up-down widget, little arrows widget or spin button
QSplitter	QSplitter implements a splitter widget
QStack	Template class that provides a stack
QStatusBar	Horizontal bar suitable for presenting status messages
QStoredDrag	Simple stored-value drag object for arbitrary MIME data
QStrIList	Doubly linked list of char* with case insensitive compare
QString	Abstraction of the classic C zero-terminated char array (char*)
QStrList	Doubly linked list of char*.
QTabBar	Tab bar, for use in e.g. tabbed dialogs
QTabDialog	Stack of tabbed widgets
QTableView	This is the abstract base class of all the table views
QTextDrag	The QTextDrag provides a drag-and-drop object for transferring plain text
QTextStream	Basic functions for reading and writing text using a QIODevice
QTime	Time functions
QTimer	Timer signals and single-shot timers
QTimerEvent	Parameters that describe a timer event
QToolBar	Simple tool bar
QToolButton	Push button whose appearance has been tailored for use in a QToolBar
QToolTip	Tool tips (sometimes called balloon help) for any widget or rectangular part of a widget
QToolTipGroup	Collects tool tips into natural groups
QUrlDrag	Provides for drag-and-drop of a list of file references
QValidator	Validation of input text
QVBoxLayout	Lines up child widgets vertically
QWhatsThis	Simple description of any widget, e.g. answering the question "what's this?"
QWidget	The base class of all user interface objects
QWidgetStack	Stack of widgets, where the user can see only the top widget
QWindow	Reserved for future extensions
QWMatrix	2D transformations of a coordinate system
QXtApplication	Allows mixing of Xt/Motif and Qt widgets [Qt Xt/Motif Extension]
QXtWidget	Allows mixing of Xt/Motif and Qt widgets [Qt Xt/Motif Extension]