| Q3Accel | Handles keyboard accelerator and shortcut keys |
| Q3Action | Abstract user interface action that can appear both in menus and tool bars |
| Q3ActionGroup | Groups actions together |
| Q3AsciiCache | Template class that provides a cache based on char* keys |
| Q3AsciiCacheIterator | Iterator for Q3AsciiCache collections |
| Q3AsciiDict | Template class that provides a dictionary based on char* keys |
| Q3AsciiDictIterator | Iterator for Q3AsciiDict collections |
| Q3Button | Compatibility base class of button widgets |
| Q3ButtonGroup | Organizes QAbstractButton widgets in a group |
| Q3CString | Abstraction of the classic C zero-terminated char array (char *) |
| Q3Cache | Template class that provides a cache based on QString keys |
| Q3CacheIterator | Iterator for Q3Cache collections |
| Q3Canvas | 2D area that can contain Q3CanvasItem objects |
| Q3CanvasEllipse | Ellipse or ellipse segment on a Q3Canvas |
| Q3CanvasItem | Abstract graphic object on a Q3Canvas |
| Q3CanvasItemList | List of Q3CanvasItems |
| Q3CanvasLine | Line on a Q3Canvas |
| Q3CanvasPixmap | Pixmaps for Q3CanvasSprites |
| Q3CanvasPixmapArray | Array of Q3CanvasPixmaps |
| Q3CanvasPolygon | Polygon on a Q3Canvas |
| Q3CanvasPolygonalItem | Polygonal canvas item on a Q3Canvas |
| Q3CanvasRectangle | Rectangle on a Q3Canvas |
| Q3CanvasSpline | Multi-bezier splines on a Q3Canvas |
| Q3CanvasSprite | Animated canvas item on a Q3Canvas |
| Q3CanvasText | Text object on a Q3Canvas |
| Q3CanvasView | On-screen view of a Q3Canvas |
| Q3CheckListItem | Checkable list view items |
| Q3CheckTableItem | Checkboxes in Q3Tables |
| Q3ColorDrag | Drag and drop object for transferring colors between widgets |
| Q3ComboBox | Combined button and popup list |
| Q3ComboTableItem | Means of using comboboxes in Q3Tables |
| Q3DataBrowser | Data manipulation and navigation for data entry forms |
| Q3DataTable | Flexible SQL table widget that supports browsing and editing |
| Q3DataView | Read-only SQL forms |
| Q3DateEdit | Date editor |
| Q3DateTimeEdit | Combines a Q3DateEdit and Q3TimeEdit widget into a single widget for editing datetimes |
| Q3DateTimeEditBase | Abstraction for date and edit editors |
| Q3DeepCopy | Template class which ensures that implicitly shared and explicitly shared classes reference unique data |
| Q3Dict | Template class that provides a dictionary based on QString keys |
| Q3DictIterator | Iterator for Q3Dict collections |
| Q3Dns | Asynchronous DNS lookups |
| Q3DockArea | Manages and lays out Q3DockWindows |
| Q3DockWindow | Widget which can be docked inside a Q3DockArea or floated as a top level window on the desktop |
| Q3DragObject | Encapsulates MIME-based data transfer |
| Q3DropSite | Nothing and does nothing |
| Q3EditorFactory | Used to create editor widgets for QVariant data types |
| Q3FileDialog | Dialogs that allow users to select files or directories |
| Q3FileIconProvider | Icons for Q3FileDialog to use |
| Q3FilePreview | File previewing in Q3FileDialog |
| Q3Frame |
| Q3Ftp | Implementation of the FTP protocol |
| Q3Grid | Simple geometry management of its children |
| Q3GridView | Abstract base for fixed-size grids |
| Q3GroupBox | Group box frame with a title |
| Q3HBox | Horizontal geometry management for its child widgets |
| Q3HButtonGroup | Organizes button widgets in a group with one horizontal row |
| Q3Header | Header row or column, e.g. for tables and listviews |
| Q3Http | Implementation of the HTTP protocol |
| Q3HttpHeader | Header information for HTTP |
| Q3HttpRequestHeader | Request header information for HTTP |
| Q3HttpResponseHeader | Response header information for HTTP |
| Q3IconDrag | Supports drag and drop operations within a Q3IconView |
| Q3IconDragItem | Encapsulates a drag item |
| Q3IconView | Area with movable labelled icons |
| Q3IconViewItem | Single item in a Q3IconView |
| Q3ImageDrag | Drag and drop object for transferring images |
| Q3IntCache | Template class that provides a cache based on long keys |
| Q3IntCacheIterator | Iterator for Q3IntCache collections |
| Q3IntDict | Template class that provides a dictionary based on long keys |
| Q3IntDictIterator | Iterator for Q3IntDict collections |
| Q3ListBox | List of selectable, read-only items |
| Q3ListBoxItem | The base class of all list box items |
| Q3ListBoxPixmap | List box items with a pixmap and optional text |
| Q3ListBoxText | List box items that display text |
| Q3ListView | Implements a list/tree view |
| Q3ListViewItem | Implements a list view item |
| Q3ListViewItemIterator | Iterator for collections of Q3ListViewItems |
| Q3LocalFs | Implementation of a QNetworkProtocol that works on the local file system |
| Q3MainWindow | Main application window, with a menu bar, dock windows (e.g. for toolbars), and a status bar |
| Q3MemArray | Template class that provides arrays of simple types |
| Q3MimeSourceFactory | Extensible provider of mime-typed data |
| Q3MultiLineEdit | Simple editor for inputting text |
| Q3NetworkOperation | Common operations for network protocols |
| Q3NetworkProtocol | Common API for network protocols |
| Q3PaintDeviceMetrics | Information about a paint device |
| Q3Painter | Qt 3 compatibility wrapper for QPainter |
| Q3Picture | Paint device that records and replays Q3Painter commands |
| Q3PointArray |
| Q3PopupMenu | Thin compatibility wrapper around QMenu |
| Q3Process | Used to start external programs and to communicate with them |
| Q3ProgressBar | Horizontal progress bar |
| Q3ProgressDialog | Feedback on the progress of a slow operation |
| Q3PtrCollection | The base class of most pointer-based Qt collections |
| Q3PtrDict | Template class that provides a dictionary based on void* keys |
| Q3PtrDictIterator | Iterator for Q3PtrDict collections |
| Q3PtrList | Template class that provides a list |
| Q3PtrListIterator | Iterator for Q3PtrList collections |
| Q3PtrQueue | Template class that provides a queue |
| Q3PtrStack | Template class that provides a stack |
| Q3PtrVector | Template collection class that provides a vector (array) |
| Q3RangeControl | Integer value within a range |
| Q3ScrollView | Scrolling area with on-demand scroll bars |
| Q3Semaphore | Robust integer semaphore |
| Q3ServerSocket | TCP-based server |
| Q3Shared | Used internally for implementing shared classes |
| Q3Signal | Can be used to send signals for classes that don't inherit QObject |
| Q3SimpleRichText | Small displayable piece of rich text |
| Q3Socket | Buffered TCP connection |
| Q3SocketDevice | Platform-independent low-level socket API |
| Q3SqlCursor | Browsing and editing of SQL tables and views |
| Q3SqlEditorFactory | Used to create the editors used by Q3DataTable and Q3SqlForm |
| Q3SqlFieldInfo | Stores meta data associated with a SQL field |
| Q3SqlForm | Creates and manages data entry forms tied to SQL databases |
| Q3SqlPropertyMap | Used to map widgets to SQL fields |
| Q3SqlRecordInfo | Encapsulates a set of database field meta data |
| Q3SqlSelectCursor | Browsing of general SQL SELECT statements |
| Q3StoredDrag | Simple stored-value drag object for arbitrary MIME data |
| Q3StrIList | Doubly-linked list of char* with case-insensitive comparison |
| Q3StrList | Doubly-linked list of char* |
| Q3StrListIterator | Iterator for the Q3StrList and Q3StrIList classes |
| Q3StyleSheet | Collection of styles for rich text rendering and a generator of tags |
| Q3StyleSheetItem | Encapsulation of a set of text styles |
| Q3SyntaxHighlighter | Base class for implementing Q3TextEdit syntax highlighters |
| Q3TabDialog | Stack of tabbed widgets |
| Q3Table | Flexible editable table widget |
| Q3TableItem | The cell content for Q3Table cells |
| Q3TableSelection | Access to a selected area in a Q3Table |
| Q3TextBrowser | Rich text browser with hypertext navigation |
| Q3TextDrag | Drag and drop object for transferring plain and Unicode text |
| Q3TextEdit | Powerful single-page rich text editor |
| Q3TextView | Rich text viewer |
| Q3TimeEdit | Time editor |
| Q3ToolBar | Movable panel containing widgets such as tool buttons |
| Q3UriDrag | Drag object for a list of URI references |
| Q3Url | URL parser and simplifies working with URLs |
| Q3UrlOperator | Common operations on URLs |
| Q3VBox | Vertical geometry management of its child widgets |
| Q3VButtonGroup | Organizes button widgets in a vertical column |
| Q3ValueList | Value-based template class that provides lists |
| Q3ValueListConstIterator | Const iterator for Q3ValueList |
| Q3ValueListIterator | Iterator for Q3ValueList |
| Q3ValueStack | Value-based template class that provides a stack |
| Q3ValueVector | Value-based template class that provides a dynamic array |
| Q3WhatsThis |
| Q3WidgetStack | Stack of widgets of which only the top widget is user-visible |
| Q3Wizard | Framework for wizard dialogs |
| QAbstractButton | The abstract base class of button widgets, providing functionality common to buttons |
| QAbstractEventDispatcher | Manages Qt's event queue, excluding GUI-related events |
| QAbstractExtensionFactory | Interface for extension factories in Qt Designer |
| QAbstractExtensionManager | Interface for extension managers in Qt Designer |
| QAbstractFileEngine | Abstraction for accessing the filesystem |
| QAbstractFileEngineHandler | Way to register custom file engines with your application |
| QAbstractFormBuilder | Default implementation for classes that create user interfaces at run-time |
| QAbstractItemDelegate | Used to display and edit data items from a model |
| QAbstractItemModel | The abstract interface for item model classes |
| QAbstractItemView | The basic functionality for item view classes |
| QAbstractListModel | Abstract model that can be subclassed to create one-dimensional list models |
| QAbstractPrintDialog | Base implementation for print dialogs used to configure printers |
| QAbstractProxyModel | Base class for proxy item models that can do sorting, filtering or other data processing tasks |
| QAbstractScrollArea | Scrolling area with on-demand scroll bars |
| QAbstractSlider | Integer value within a range |
| QAbstractSocket | The base functionality common to all socket types |
| QAbstractSpinBox | Spinbox and a line edit to display values |
| QAbstractTableModel | Abstract model that can be subclassed to create table models |
| QAbstractTextDocumentLayout | Abstract base class used to implement custom layouts for QTextDocuments |
| QAccessible | Enums and static functions relating to accessibility |
| QAccessibleBridge | The base class for accessibility back-ends |
| QAccessibleBridgePlugin | Abstract base for accessibility bridge plugins |
| QAccessibleEvent | Used to query addition accessibility information about complex widgets |
| QAccessibleInterface | Defines an interface that exposes information about accessible objects |
| QAccessibleObject | Implements parts of the QAccessibleInterface for QObjects |
| QAccessiblePlugin | Abstract base for accessibility plugins |
| QAccessibleWidget | Implements the QAccessibleInterface for QWidgets |
| QAction | Abstract user interface action that can be inserted into widgets |
| QActionEvent | Event that is generated when a QAction is added, removed, or changed |
| QActionGroup | Groups actions together |
| QApplication | Manages the GUI application's control flow and main settings |
| QAssistantClient | Means of using Qt Assistant as an application's help tool |
| QAxAggregated | Abstract base class for implementations of additional COM interfaces |
| QAxBase | Abstract class that provides an API to initalize and access a COM object |
| QAxBindable | Interface between a QWidget and an ActiveX client |
| QAxFactory | Defines a factory for the creation of COM components |
| QAxObject | QObject that wraps a COM object |
| QAxScript | Wrapper around script code |
| QAxScriptEngine | Wrapper around a script engine |
| QAxScriptManager | Bridge between application objects and script code |
| QAxWidget | QWidget that wraps an ActiveX control |
| QBasicTimer | Timer events for objects |
| QBitArray | Array of bits |
| QBitmap | Monochrome (1-bit depth) pixmaps |
| QBoxLayout | Lines up child widgets horizontally or vertically |
| QBrush | Defines the fill pattern of shapes drawn by QPainter |
| QBuffer | QIODevice interface for a QByteArray |
| QButtonGroup | Container to organize groups of button widgets |
| QByteArray | Array of bytes |
| QByteArrayMatcher | Holds a sequence of bytes that can be quickly matched in a byte array |
| QCDEStyle | CDE look and feel |
| QCache | Template class that provides a cache |
| QChar | 16-bit Unicode character |
| QCheckBox | Checkbox with a text label |
| 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, HSV or CMYK values |
| QColorDialog | Dialog widget for specifying colors |
| QColorGroup |
| QColormap | Maps device independent QColors to device dependent pixel values |
| QComboBox | Combined button and popup list |
| QCommonStyle | Encapsulates the common Look and Feel of a GUI |
| QConicalGradient | Used in combination with QBrush to specify a conical gradient brush |
| QConstString | Wrapper for constant Unicode string data |
| QContextMenuEvent | Parameters that describe a context menu event |
| QCopChannel | Communication capabilities between clients |
| QCoreApplication | Event loop for console Qt applications |
| QCursor | Mouse cursor with an arbitrary shape |
| QCustomEvent | Support for custom events |
| QDataStream | Serialization of binary data to a QIODevice |
| QDate | Date functions |
| QDateEdit | Widget for editing dates based on the QDateTimeEdit widget |
| QDateTime | Date and time functions |
| QDateTimeEdit | Widget for editing dates and times |
| QDecoration | Allows the appearance of top level windows to be customized |
| QDecorationFactory | Creates QDecoration objects |
| QDecorationPlugin | Abstract base class for decoration plugins |
| QDesignerActionEditorInterface | Allows you to change the focus of Qt Designer's action editor |
| QDesignerContainerExtension | Allows you to add pages to a custom multi-page container in Qt Designer's workspace |
| QDesignerCustomWidgetCollectionInterface | Allows you to include several custom widgets in one single library |
| QDesignerCustomWidgetInterface | Enables Qt Designer to access and construct a custom widget |
| QDesignerFormEditorInterface | Allows you to access Qt Designer's various components |
| QDesignerFormWindowCursorInterface | Allows you to query and modify a form window's widget selection, and in addition modify the properties of all the form's widgets |
| QDesignerFormWindowInterface | Allows you to query and manipulate form windows appearing in Qt Designer's workspace |
| QDesignerFormWindowManagerInterface | Allows you to manipulate the collection of form windows in Qt Designer, and control Qt Designer's form editing actions |
| QDesignerMemberSheetExtension | Allows you to manipulate a widget's member functions which is displayed when configuring connections using Qt Designer's mode for editing signals and slots |
| QDesignerObjectInspectorInterface | Allows you to change the focus of Qt Designer's object inspector |
| QDesignerPropertyEditorInterface | Allows you to query and manipulate the current state of Qt Designer's property editor |
| QDesignerPropertySheetExtension | Allows you to manipulate a widget's properties which is displayed in Qt Designer's property editor |
| QDesignerTaskMenuExtension | Allows you to add custom menu entries to Qt Designer's task menu |
| QDesignerWidgetBoxInterface | Allows you to control the contents of Qt Designer's widget box |
| 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 |
| QDir | Access to directory structures and their contents |
| QDirModel | Data model for the local filesystem |
| QDirectPainter | Direct access to the video hardware |
| QDockWidget | Widget that can be docked inside a QMainWindow 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 |
| QDoubleSpinBox | Spin box widget that takes doubles |
| QDoubleValidator | Range checking of floating-point numbers |
| QDrag | Support for MIME-based drag and drop data transfer |
| QDragEnterEvent | Event which is sent to a widget when a drag and drop action enters it |
| QDragLeaveEvent | Event that is sent to a widget when a drag and drop action leaves it |
| QDragMoveEvent | Event which is sent while a drag and drop action is in progress |
| QDropEvent | Event which is sent when a drag and drop action is completed |
| QErrorMessage | Error message display dialog |
| QEvent | The base class of all event classes. Event objects contain event parameters |
| QEventLoop | Means of entering and leaving an event loop |
| QExtensionFactory | Allows you to create a factory that is able to make instances of custom extensions in Qt Designer |
| QExtensionManager | Extension management facilities for Qt Designer |
| QFSFileEngine | Implements Qt's default file engine |
| QFile | Interface for reading from and writing to files |
| QFileDialog | Dialog that allow users to select files or directories |
| QFileIconProvider | File icon for the QDirModel class |
| QFileInfo | System-independent file information |
| QFileOpenEvent | Event that will be sent when there is a request to open a file |
| QFlag | Helper data type for QFlags |
| QFlags | Type-safe way of storing OR-combinations of enum values |
| QFocusEvent | Event parameters for widget focus events |
| QFocusFrame | Focus frame which can be outside of a widget's normal paintable area |
| 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 |
| QFontMetrics | Font metrics information |
| QFontMetricsF | Font metrics information |
| QFormBuilder | Used to dynamically construct user interfaces from .ui files at run-time |
| QFrame | The base class of widgets that can have a frame |
| QFtp | Implementation of the FTP protocol |
| QGLColormap | Used for installing custom colormaps into QGLWidgets |
| QGLContext | Encapsulates an OpenGL rendering context |
| QGLFormat | The display format of an OpenGL rendering context |
| QGLPixelBuffer | Encapsulates an OpenGL pbuffer |
| QGLWidget | Widget for rendering OpenGL graphics |
| QGenericArgument | Internal helper class for marshalling arguments |
| QGenericReturnArgument | Internal helper class for marshalling arguments |
| QGradient | Used in combination with QBrush to specify gradient fills |
| QGridLayout | Lays out widgets in a grid |
| QGroupBox | Group box frame with a title |
| QHBoxLayout | Lines up widgets horizontally |
| QHash | Template class that provides a hash-table-based dictionary |
| QHashIterator | Java-style const iterator for QHash and QMultiHash |
| QHeaderView | Header row or header column for item views |
| QHelpEvent | Event that is used to request helpful information about a particular point in a widget |
| QHideEvent | Event which is sent after a widget is hidden |
| QHostAddress | IP address |
| QHostInfo | Static functions for host name lookups |
| QHoverEvent | Parameters that describe a mouse event |
| QHttp | Implementation of the HTTP protocol |
| QHttpHeader | Header information for HTTP |
| QHttpRequestHeader | Request header information for HTTP |
| QHttpResponseHeader | Response header information for HTTP |
| QIODevice | The base interface class of all I/O devices in Qt |
| QIcon | Scalable icons in different modes and states |
| QIconDragEvent | Indicates that a main icon drag has begun |
| QIconEngine | Abstract base class for QIcon renderers |
| QIconEnginePlugin | Abstract base for custom QIconEngine plugins |
| QImage | Hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device |
| QImageIOHandler | Defines the common image I/O interface for all image formats in Qt |
| QImageIOPlugin | Defines an interface for writing an image format plugin |
| QImageReader | Format independent interface for reading images from files or other devices |
| QImageWriter | Format independent interface for writing images to files or other devices |
| QInputContext | Abstracts the input method dependent data and composing state |
| QInputContextFactory | Creates QInputContext objects |
| QInputContextPlugin | Abstract base for custom QInputContext plugins |
| QInputDialog | Simple convenience dialog to get a single value from the user |
| QInputEvent | The base class for events that describe user input |
| QInputMethodEvent | Parameters for input method events |
| QIntValidator | Validator that ensures a string contains a valid integer within a specified range |
| QItemDelegate | Display and editing facilities for data items from a model |
| QItemEditorCreatorBase | Abstract base class that must be subclassed when implementing new item editor creators |
| QItemEditorFactory | Widgets for editing item data in views and delegates |
| QItemSelection | Manages information about selected items in a model |
| QItemSelectionModel | Keeps track of a view's selected items |
| QItemSelectionRange | Manages information about a range of selected items in a model |
| QKbdDriverFactory | Creates QWSKeyboardHandler objects |
| QKbdDriverPlugin | Abstract base class for keyboard driver plugins |
| QKeyEvent | Describes a key event |
| QKeySequence | Encapsulates a key sequence as used by shortcuts |
| QLCDNumber | Displays a number with LCD-like digits |
| QLabel | Text or image display |
| QLatin1Char | 8-bit ASCII/Latin-1 character |
| QLatin1String | Thin wrapper around an ASCII/Latin-1 encoded string literal |
| QLayout | The base class of geometry managers |
| QLayoutItem | Abstract item that a QLayout manipulates |
| QLibrary | Loads shared libraries at runtime |
| QLibraryInfo | Information about the Qt library |
| QLine | Two-dimensional vector using integer precision |
| QLineEdit | One-line text editor |
| QLineF | Two-dimensional vector using floating point precision |
| QLinearGradient | Used in combination with QBrush to specify a linear gradient brush |
| QLinkedList | Template class that provides linked lists |
| QLinkedListIterator | Java-style const iterator for QLinkedList |
| QLinuxFbScreen | Implements a screen driver for the Linux framebuffer |
| QList | Template class that provides lists |
| QListIterator | Java-style const iterator for QList and QQueue |
| QListView | List or icon view onto a model |
| QListWidget | Item-based list widget |
| QListWidgetItem | Item for use with the QListWidget item view class |
| QLocale | Converts between numbers and their string representations in various languages |
| QMacMime | Maps open-standard MIME to Mac flavors |
| QMacStyle | Mac OS X style using the Apple Appearance Manager |
| QMainWindow | Main application window |
| QMap | Template class that provides a skip-list-based dictionary |
| QMapIterator | Java-style const iterator for QMap and QMultiMap |
| QMatrix | 2D transformations of a coordinate system |
| QMenu | Menu widget for use in menu bars, context menus, and other popup menus |
| QMenuBar | Horizontal menu bar |
| QMenuItem | Represents an item in a menu |
| QMessageBox | Modal dialog with a short message, an icon, and some buttons |
| QMetaClassInfo | Additional information about a class |
| QMetaEnum | Meta-data about an enumerator |
| QMetaMethod | Meta-data about a member function |
| QMetaObject | Meta-information about Qt objects |
| QMetaProperty | Meta-data about a property |
| QMetaType | Manages named types in the meta-object system |
| QMimeData | Container for data that records information about its MIME type |
| QMimeSource | Abstraction of objects that provided formatted data of a certain MIME type |
| QModelIndex | Used to locate data in a data model |
| QMotifStyle | Motif look and feel |
| QMouseDriverFactory | Creates QWSMouseHandler objects |
| QMouseDriverPlugin | Abstract base class for mouse driver plugins |
| QMouseEvent | Parameters that describe a mouse event |
| QMoveEvent | Event parameters for move events |
| QMovie | Convenience class for playing movies with QImageReader |
| QMultiHash | Convenience QHash subclass that provides multi-valued hashes |
| QMultiMap | Convenience QMap subclass that provides multi-valued maps |
| QMutableHashIterator | Java-style non-const iterator for QHash and QMultiHash |
| QMutableLinkedListIterator | Java-style non-const iterator for QLinkedList |
| QMutableListIterator | Java-style non-const iterator for QList and QQueue |
| QMutableMapIterator | Java-style non-const iterator for QMap and QMultiMap |
| QMutableVectorIterator | Java-style non-const iterator for QVector and QStack |
| QMutex | Access serialization between threads |
| QMutexLocker | Convenience class that simplifies locking and unlocking mutexes |
| QNetworkProxy | Network layer proxy |
| QObject | The base class of all Qt objects |
| QObjectCleanupHandler | Watches the lifetime of multiple QObjects |
| QPageSetupDialog | Configuration dialog for the page-related options on a printer |
| QPaintDevice | The base class of objects that can be painted |
| QPaintEngine | Abstract definition of how QPainter draws to a given device on a given platform |
| QPaintEngineState | Information about the active paint engine's current state |
| QPaintEvent | Event parameters for paint events |
| QPainter | Performs low-level painting on widgets and other paint devices |
| QPainterPath | Container for painting operations, enabling graphical shapes to be constructed and reused |
| QPainterPathStroker | Used to generate fillable outlines for a given painter path |
| QPair | Template class that stores a pair of items |
| QPalette | Color groups for each widget state |
| QPen | Defines how a QPainter should draw lines and outlines of shapes |
| QPersistentModelIndex | Used to locate data in a data model |
| QPicture | Paint device that records and replays QPainter commands |
| QPictureFormatPlugin | Abstract base for custom picture format plugins |
| QPictureIO | Parameters for loading and saving pictures |
| QPixmap | Off-screen image representation that can be used as a paint device |
| QPixmapCache | Application-wide cache for pixmaps |
| QPlastiqueStyle | Widget style similar to the Plastik style available in KDE |
| QPluginLoader | Loads a plugin at run-time |
| QPoint | Defines a point in the plane using integer precision |
| QPointF | Defines a point in the plane using floating point precision |
| QPointer | Template class that provides guarded pointers to QObjects |
| QPolygon | Vector of points using integer precision |
| QPolygonF | Vector of points using floating point precision |
| QPrintDialog | Dialog for specifying the printer's configuration |
| QPrintEngine | Defines an interface for how QPrinter interacts with a given printing subsystem |
| QPrinter | Paint device that paints on a printer |
| QProcess | Used to start external programs and to communicate with them |
| QProgressBar | Horizontal or vertical progress bar |
| QProgressDialog | Feedback on the progress of a slow operation |
| QProxyModel | Support for processing data passed between another model and a view |
| QPushButton | Command button |
| QQueue | Generic container that provides a queue |
| QRadialGradient | Used in combination with QBrush to specify a radial gradient brush |
| QRadioButton | Radio button with a text label |
| QReadLocker | Convenience class that simplifies locking and unlocking read-write locks for read access |
| QReadWriteLock | Read-write locking |
| QRect | Defines a rectangle in the plane using integer precision |
| QRectF | Defines a rectangle in the plane using floating point precision |
| 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 |
| QRubberBand | Rectangle or line that can indicate a selection or a boundary |
| QScreen | Base class for implementing screen drivers in Qtopia Core |
| QScreenCursor | Manages the onscreen mouse cursor |
| QScreenDriverFactory | Creates QScreen objects |
| QScreenDriverPlugin | Abstract base class for graphics driver plugins |
| QScrollArea | Scrolling view onto another widget |
| QScrollBar | Vertical or horizontal scroll bar |
| QSemaphore | General counting semaphore |
| QSessionManager | Access to the session manager |
| QSet | Template class that provides a hash-table-based set |
| QSetIterator | Java-style const iterator for QSet |
| QSettings | Persistent platform-independent application settings |
| QSharedData | Base class for shared data objects |
| QSharedDataPointer | Pointer to a shared data object |
| QShortcut | Used to create keyboard shortcuts |
| QShortcutEvent | Event which is generated when the user presses a key combination |
| QShowEvent | Event that is sent when a widget is shown |
| QSignalMapper | Bundles signals from identifiable senders |
| QSignalSpy | Enables introspection of signal emission |
| QSize | Defines the size of a two-dimensional object using integer point precision |
| QSizeF | Defines the size of a two-dimensional object using floating point precision |
| QSizeGrip | Corner-grip for resizing a top-level window |
| QSizePolicy | Layout attribute describing horizontal and vertical resizing policy |
| QSlider | Vertical or horizontal slider |
| QSocketNotifier | Support for monitoring activity on a file descriptor |
| QSortFilterProxyModel | Support for sorting and filtering data passed between another model and a view |
| QSound | Access to the platform audio facilities |
| QSpacerItem | Blank space in a layout |
| QSpinBox | Spin box widget |
| QSplashScreen | Splash screen that can be shown during application startup |
| QSplitter | Implements a splitter widget |
| QSplitterHandle | Handle functionality of the splitter |
| QSqlDatabase | Represents a connection to a database |
| QSqlDriver | Abstract base class for accessing specific SQL databases |
| QSqlDriverCreator | Template class that provides a SQL driver factory for a specific driver type |
| QSqlDriverCreatorBase | The base class for SQL driver factories |
| QSqlDriverPlugin | Abstract base for custom QSqlDriver plugins |
| QSqlError | SQL database error information |
| QSqlField | Manipulates the fields in SQL database tables and views |
| QSqlIndex | Functions to manipulate and describe database indexes |
| QSqlQuery | Means of executing and manipulating SQL statements |
| QSqlQueryModel | Read-only data model for SQL result sets |
| QSqlRecord | Encapsulates a database record |
| QSqlRelation | Stores information about an SQL foreign key |
| QSqlRelationalDelegate | Delegate that is used to display and edit data from a QSqlRelationalTableModel |
| QSqlRelationalTableModel | Editable data model for a single database table, with foreign key support |
| QSqlResult | Abstract interface for accessing data from specific SQL databases |
| QSqlTableModel | Editable data model for a single database table |
| QStack | Template class that provides a stack |
| QStackedLayout | Stack of widgets where only one widget is visible at a time |
| QStackedWidget | Stack of widgets where only one widget is visible at a time |
| QStandardItemModel | Generic model for storing custom data |
| QStatusBar | Horizontal bar suitable for presenting status information |
| QStatusTipEvent | Event that is used to show messages in a status bar |
| QString | Unicode character string |
| QStringList | List of strings |
| QStringListModel | Model that supplies strings to views |
| QStringMatcher | Holds a sequence of characters that can be quickly matched in a Unicode string |
| QStyle | Abstract base class that encapsulates the look and feel of a GUI |
| QStyleFactory | Creates QStyle objects |
| QStyleHintReturn | Style hints that return more than basic data types |
| QStyleHintReturnMask | Style hints that return a QRegion |
| QStyleOption | Stores the parameters used by QStyle functions |
| QStyleOptionButton | Used to describe the parameters for drawing buttons |
| QStyleOptionComboBox | Used to describe the parameter for drawing a combobox |
| QStyleOptionComplex | Used to hold parameters that are common to all complex controls |
| QStyleOptionDockWidget | Used to describe the parameters for drawing a dock window |
| QStyleOptionFocusRect | Used to describe the parameters for drawing a focus rectangle with QStyle |
| QStyleOptionFrame | Used to describe the parameters for drawing a frame |
| QStyleOptionFrameV2 | Used to describe the parameters necessary for drawing a frame in Qt 4.1 or above |
| QStyleOptionGroupBox | Describes the parameters for drawing a group box |
| QStyleOptionHeader | Used to describe the parameters for drawing a header |
| QStyleOptionMenuItem | Used to describe the parameter necessary for drawing a menu item |
| QStyleOptionProgressBar | Used to describe the parameters necessary for drawing a progress bar |
| QStyleOptionProgressBarV2 | Used to describe the parameters necessary for drawing a progress bar in Qt 4.1 or above |
| QStyleOptionQ3DockWindow | Used to describe the parameters for drawing various parts of a |
| QStyleOptionQ3ListView | Used to describe the parameters for drawing a Q3ListView |
| QStyleOptionQ3ListViewItem | Used to describe an item drawn in a Q3ListView |
| QStyleOptionRubberBand | Used to describe the parameters needed for drawing a rubber band |
| QStyleOptionSlider | Used to describe the parameters needed for drawing a slider |
| QStyleOptionSpinBox | Used to describe the parameters necessary for drawing a spin box |
| QStyleOptionTab | Used to describe the parameters for drawing a tab bar |
| QStyleOptionTabBarBase | Used to describe the the base of a tabbar. That is the part that the tabbar usually overlaps with |
| QStyleOptionTabV2 | Used to describe the parameters necessary for drawing a tabs in Qt 4.1 or above |
| QStyleOptionTabWidgetFrame | Used to describe the parameters for drawing the frame around a tab widget |
| QStyleOptionTitleBar | Used to describe the parameters for drawing a title bar |
| QStyleOptionToolBar | Used to describe the parameters for drawing a toolbar |
| QStyleOptionToolBox | Used to describe the parameters needed for drawing a tool box |
| QStyleOptionToolButton | Used to describe the parameters for drawing a tool button |
| QStyleOptionViewItem | Used to describe the parameters used to draw an item in a view widget |
| QStylePainter | Convenience class for drawing QStyle elements inside a widget |
| QStylePlugin | Abstract base for custom QStyle plugins |
| QSvgRenderer | Used to draw the contents of SVG files onto paint devices |
| QSvgWidget | Widget that is used to display the contents of Scalable Vector Graphics (SVG) files |
| QSyntaxHighlighter | Allows you to define syntax highlighting rules, and in addition you can use the class to query a document's current formatting or user data |
| QSysInfo | Information about the system |
| QTabBar | Tab bar, e.g. for use in tabbed dialogs |
| QTabWidget | Stack of tabbed widgets |
| QTableView | Default model/view implementation of a table view |
| QTableWidget | Item-based table view with a default model |
| QTableWidgetItem | Item for use with the QTableWidget class |
| QTableWidgetSelectionRange | Container for storing a selection range in a QTableWidget |
| QTabletEvent | Parameters that describe a Tablet event |
| QTcpServer | TCP-based server |
| QTcpSocket | TCP socket |
| QTemporaryFile | I/O device that operates on temporary files |
| QTestEventList | List of GUI events |
| QTextBlock | Container for text fragments in a QTextDocument |
| QTextBlockFormat | Formatting information for blocks of text in a QTextDocument |
| QTextBlockGroup | Container for text blocks within a QTextDocument |
| QTextBlockUserData | Used to associate custom data with blocks of text |
| QTextBrowser | Rich text browser with hypertext navigation |
| QTextCharFormat | Formatting information for characters in a QTextDocument |
| QTextCodec | Conversions between text encodings |
| QTextCodecPlugin | Abstract base for custom QTextCodec plugins |
| QTextCursor | Offers an API to access and modify QTextDocuments |
| QTextDecoder | State-based decoder |
| QTextDocument | Holds formatted text that can be viewed and edited using a QTextEdit |
| QTextDocumentFragment | Represents a piece of formatted text from a QTextDocument |
| QTextEdit | Widget that is used to edit and display both plain and rich text |
| QTextEncoder | State-based encoder |
| QTextFormat | Formatting information for a QTextDocument |
| QTextFragment | Holds a piece of text in a QTextDocument with a single QTextCharFormat |
| QTextFrame | Represents a frame in a QTextDocument |
| QTextFrameFormat | Formatting information for frames in a QTextDocument |
| QTextIStream | Convenience class for input streams |
| QTextImageFormat | Formatting information for images in a QTextDocument |
| QTextInlineObject | Represents an inline object in a QTextLayout |
| QTextLayout | Used to lay out and paint a single paragraph of text |
| QTextLength | Encapsulates the different types of length used in a QTextDocument |
| QTextLine | Represents a line of text inside a QTextLayout |
| QTextList | Decorated list of items in a QTextDocument |
| QTextListFormat | Formatting information for lists in a QTextDocument |
| QTextOStream | Convenience class for output streams |
| QTextObject | Base class for different kinds of objects that can group parts of a QTextDocument together |
| QTextOption | Description of general rich text properties |
| QTextStream | Convenient interface for reading and writing text |
| QTextTable | Represents a table in a QTextDocument |
| QTextTableCell | Represents the properties of a cell in a QTextTable |
| QTextTableFormat | Formatting information for tables in a QTextDocument |
| QThread | Platform-independent threads |
| QThreadStorage | Per-thread data storage |
| QTime | Clock time functions |
| QTimeEdit | Widget for editing times based on the QDateTimeEdit widget |
| QTimer | Repetitive and single-shot timers |
| QTimerEvent | Parameters that describe a timer event |
| QToolBar | Movable panel that contains a set of controls |
| QToolBox | Column of tabbed widget items |
| QToolButton | Quick-access button to commands or options, usually used inside a QToolBar |
| QToolTip | Tool tips (balloon help) for any widget |
| QTransformedScreen | Implements a screen driver for a transformed screen |
| QTranslator | Internationalization support for text output |
| QTreeView | Default model/view implementation of a tree view |
| QTreeWidget | Tree view that uses a predefined tree model |
| QTreeWidgetItem | Item for use with the QTreeWidget convenience class |
| QTreeWidgetItemIterator | Way to iterate over the items in a QTreeWidget instance |
| QUdpSocket | UDP socket |
| QUiLoader | Allows standalone applications dynamically create user interfaces at run-time using the information stored in .ui files or specified plugin paths |
| QUrl | Convenient interface for working with URLs |
| QUrlInfo | Stores information about URLs |
| QUuid | Stores a Universally Unique Identifier (UUID) |
| QVBoxLayout | Lines up widgets vertically |
| QVFbScreen | Implements a screen driver for the virtual framebuffer |
| QVNCScreen | Implements a screen driver for VNC servers |
| QValidator | Validation of input text |
| QVarLengthArray | Low-level variable-length array |
| QVariant | Acts like a union for the most common Qt data types |
| QVector | Template class that provides a dynamic array |
| QVectorIterator | Java-style const iterator for QVector and QStack |
| QWSCalibratedMouseHandler | Implements a mouse driver providing calibration and noise reduction |
| QWSClient | Encapsulates a client process in Qtopia Core |
| QWSEvent | Encapsulates an event in Qtopia Core |
| QWSInputMethod | International input methods in Qtopia Core |
| QWSKeyboardHandler | Implements a keyboard driver in Qtopia Core |
| QWSMouseHandler | Implements a mouse driver in Qtopia Core |
| QWSPointerCalibrationData | Container for data used in calibration of a mouse handler |
| QWSScreenSaver | Implements a screensaver in Qtopia Core |
| QWSServer | Server-specific functionality in Qtopia Core |
| QWSTslibMouseHandler | Implements a mouse driver for the Universal Touch Screen Library, tslib |
| QWSWindow | Encapsulates a top-level window in Qtopia Core |
| QWaitCondition | Condition variable for synchronizing threads |
| QWhatsThis | Simple description of any widget, i.e. answering the question "What's This?" |
| QWhatsThisClickedEvent | Event that can be used to handle hyperlinks in a "What's This?" text |
| QWheelEvent | Parameters that describe a wheel event |
| QWidget | The base class of all user interface objects |
| QWidgetItem | Layout item that represents a widget |
| QWindowStateChangeEvent | The window state before a window state change |
| QWindowsMime | Maps open-standard MIME to Window Clipboard formats |
| QWindowsStyle | Microsoft Windows-like look and feel |
| QWindowsXPStyle | Microsoft WindowsXP-like look and feel |
| QWorkspace | Workspace window that can be used in an MDI application |
| QWriteLocker | Convenience class that simplifies locking and unlocking read-write locks for write access |
| QX11EmbedContainer | XEmbed container widget |
| QX11EmbedWidget | XEmbed client widget |
| QX11Info | Information about the X display configuration |
| 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 the 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 parser |
