| QAbstractButton | The abstract base class of button widgets, providing functionality common to buttons |
| QAbstractItemDelegate | Used to display and edit data items from a model |
| QAbstractItemView | The basic functionality for item view classes |
| QAbstractPrintDialog | Base implementation for print dialogs used to configure printers |
| QAbstractScrollArea | Scrolling area with on-demand scroll bars |
| QAbstractSlider | Integer value within a range |
| QAbstractSpinBox | Spinbox and a line edit to display values |
| 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 |
| QBitmap | Monochrome (1-bit depth) pixmaps |
| QBoxLayout | Lines up child widgets horizontally or vertically |
| QBrush | Defines the fill pattern of shapes drawn by a QPainter |
| QButtonGroup | Container to organize groups of button widgets |
| QCDEStyle | CDE look and feel |
| QCheckBox | Checkbox with a text label |
| QClipboard | Access to the window system clipboard |
| QCloseEvent | Parameters that describe a close event |
| QColor | Colors based on RGB or HSV 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 |
| QContextMenuEvent | Parameters that describe a context menu event |
| QCopChannel | Communication capabilities between several clients |
| QCursor | Mouse cursor with an arbitrary shape |
| QDateEdit | Widget for editing dates based on the QDateTimeEdit widget |
| QDateTimeEdit | Widget for editing dates and times |
| QDecoration | Allows the appearance of the Qt/Embedded Window Manager to be customized |
| QDecorationFactory | Creates QDecoration objects |
| QDecorationPlugin | Abstract base for custom QDecoration plugins |
| 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 |
| 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 |
| 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 |
| QFileDialog | Dialog that allow users to select files or directories |
| QFileIconProvider | File icon for the QDirModel class |
| QFileOpenEvent | Event that will be sent when there is a request to open a file |
| 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 |
| QFrame | The base class of widgets that can have a frame |
| 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 |
| 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 |
| QHoverEvent | Parameters that describe a mouse event |
| 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 pixmap 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 for Qt/Embedded |
| QKbdDriverPlugin | Abstract base for Qt/Embedded 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 |
| QLayout | The base class of geometry managers |
| QLayoutItem | Abstract item that a QLayout manipulates |
| QLineEdit | One-line text editor |
| QLinearGradient | Used in combination with QBrush to specify a linear gradient brush |
| QListView | List or icon view onto a model |
| QListWidget | Item-based list widget |
| QListWidgetItem | Item for use with the QListWidget item view class |
| QMacMime | Maps open-standard MIME to Mac flavors |
| QMacStyle | Implements an Appearance Manager style |
| QMainWindow | Main application window |
| 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 |
| QMimeSource | Abstraction of objects that provided formatted data of a certain MIME type |
| QMotifStyle | Motif look and feel |
| QMouseDriverFactory | Creates QWSMouseHandler objects for Qt/Embedded |
| QMouseDriverPlugin | Abstract base for Qt/Embedded mouse driver plugins |
| QMouseEvent | Parameters that describe a mouse event |
| QMoveEvent | Event parameters for move events |
| QMovie | Convenience class for playing movies with QImageReader |
| 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 |
| 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 |
| 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 |
| QPictureFormatPlugin | Abstract base for custom picture format plugins |
| QPictureIO | Parameters for loading and saving pictures |
| QPixmap | Off-screen, pixel-based paint device |
| QPixmapCache | Application-wide cache for pixmaps |
| QPlastiqueStyle | Widget style similar to the Plastik style available in KDE |
| QPolygon | Vector of points |
| QPolygonF | Vector of floating point points |
| 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 |
| QProgressBar | Horizontal progress bar |
| QProgressDialog | Feedback on the progress of a slow operation |
| QProxyModel | Support for filtering and sorting data that is passed between another model and a view |
| QPushButton | Command button |
| QRadialGradient | Used in combination with QBrush to specify a radial gradient brush |
| QRadioButton | Radio button with a text label |
| 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 | And its descendants manage the framebuffer and palette |
| QScreenDriverFactory | Creates QScreen objects for Qt/Embedded |
| QScreenDriverPlugin | Abstract base for Qt/Embedded graphics driver plugins |
| QScrollArea | Scrolling view onto another widget |
| QScrollBar | Vertical or horizontal scroll bar |
| QSessionManager | Access to the session manager |
| 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 |
| QSizeGrip | Corner-grip for resizing a top-level window |
| QSizePolicy | Layout attribute describing horizontal and vertical resizing policy |
| QSlider | Vertical or horizontal slider |
| 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 |
| 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 |
| QStringListModel | Model that supplies strings to views |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| QTextBrowser | Rich text browser with hypertext navigation |
| QTextCharFormat | Formatting information for characters in a QTextDocument |
| QTextCursor | Offers an API to access and modify QTextDocuments |
| 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 |
| 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 |
| 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 |
| QTextObject | Base class for different kinds of objects that can group parts of a QTextDocument together |
| QTextOption | Description of general rich text properties |
| 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 |
| QTimeEdit | Widget for editing times based on the QDateTimeEdit widget |
| 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 |
| 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 |
| QVBoxLayout | Lines up widgets vertically |
| QValidator | Validation of input text |
| QWSInputMethod | International input methods for Qt/Embedded |
| QWSKeyboardHandler | Implements the keyboard driver for Qt/Embedded |
| QWSMouseHandler | Mouse driver for Qt/Embedded |
| QWSServer | Server-specific functionality in Qt/Embedded |
| QWSWindow | Server-specific functionality in Qt/Embedded |
| 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 be used in an MDI application |
| QX11EmbedContainer | XEmbed container widget |
| QX11EmbedWidget | XEmbed client widget |
| QX11Info | Information about the X display configuration |
