| 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 | 
| QAbstractScrollArea | Scrolling area with on-demand scroll bars | 
| QAbstractSlider | Integer value within a range | 
| QAbstractSpinBox | Spinwidget 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 | 
| 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 with QWidget::addAction() | 
| 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 | 
| 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 | 
| QDateTimeEdit | Widget for editing dates and times | 
| QDecoration | Allows the appearance of the Qtopia Core 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 | 
| QGfxDriverFactory | Creates QScreen objects for Qtopia Core | 
| QGfxDriverPlugin | Abstract base for Qtopia Core graphics driver plugins | 
| QGradient | Used in combination with QBrush to specify gradient fills | 
| QGridLayout | Lays out widgets in a grid | 
| QGridWidget | Simple geometry management of its children | 
| QGroupBox | Group box frame with a title | 
| QHBoxLayout | Lines up widgets horizontally | 
| QHBoxWidget | Horizontal geometry management for its child widgets | 
| QHeaderView | Header row or header column for item views | 
| 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 | 
| QImageIOHandlerFactoryInterface | The factory interface for QImageIOPlugin | 
| 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 | 
| 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 | 
| 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 Qtopia Core | 
| QKbdDriverPlugin | Abstract base for Qtopia Core 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 | Default model/view implementation of a list, and of an icon view | 
| 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 | 
| QMotifPlusStyle | More sophisticated Motif-ish look and feel | 
| QMotifStyle | Motif look and feel | 
| QMouseDriverFactory | Creates QWSMouseHandler objects for Qtopia Core | 
| QMouseDriverPlugin | Abstract base for Qtopia Core mouse driver plugins | 
| QMouseEvent | Parameters that describe a mouse event | 
| QMoveEvent | Event parameters for move events | 
| QMovie | Convenience class for playing movies with QImageReader | 
| 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 | Does low-level painting e.g. on widgets | 
| 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 | 
| QPlatinumStyle | Mac/Platinum look and feel | 
| QPolygon | Vector of points | 
| QPolygonF | Vector of points | 
| 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 | 
| QSGIStyle | SGI/Irix look and feel | 
| QScreen | And its descendants manage the framebuffer and palette | 
| QScrollArea | Scrolling view onto another widget | 
| QScrollBar | Vertical or horizontal scroll bar | 
| QSessionManager | Access to the session manager | 
| QShortcut | Used to create keyboard shortcuts | 
| 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 | 
| QStatusBar | Horizontal bar suitable for presenting status information | 
| QStyle | Abstract base class that encapsulates the look and feel of a GUI | 
| QStyleFactory | Creates QStyle objects | 
| QStyleHintReturn | 
| 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 | 
| 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 | 
| 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 | 
| 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 | 
| QToolBar | Movable panel that contains a set of controls | 
| QToolBarChangeEvent | Event that is sent whenever a the toolbar button is clicked on OS X | 
| 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 | 
| QVBoxWidget | Vertical geometry management of its child widgets | 
| QValidator | Validation of input text | 
| QWSInputMethod | International input methods for Qtopia Core | 
| QWSKeyboardHandler | Implements the keyboard driver for Qtopia Core | 
| QWSMouseHandler | Mouse driver for Qtopia Core | 
| QWSServer | Server-specific functionality in Qtopia Core | 
| QWSWindow | Server-specific functionality in Qtopia Core | 
| QWhatsThis | Simple description of any widget, i.e. answering the question "What's this?" | 
| QWhatsThisAction | Ready-made action to invoke "What's This" context help | 
| QWheelEvent | Parameters that describe a wheel event | 
| QWidget | The base class of all user interface objects | 
| QWidgetContainerPlugin | Abstract base for complex custom container QWidget plugins | 
| QWidgetItem | Layout item that represents a widget | 
| QWidgetPlugin | Abstract base for custom QWidget plugins | 
| 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 | 
| QX11Info | Information about the X display configuration |