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QWidget Class Reference

The QWidget class is the base class of all user interface objects. More...

Inherits QPaintDevice.

Inherited by AbstractFindWidget, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AddressBook, AnalogClock, AnalogClock, AnimationSaveWidget, ApplicationsTab, ArrowPad, ArthurFrame, BasicOperations, BasicOperations, BlueTitleBar, BookmarkWidget, Browser, ButtonWidget, CalculatorForm, CalculatorForm, CalculatorForm, CentralWidget, CharacterWidget, ChaseWidget, CircleWidget, CombinedTransformation, CombinedTransformation, CompositionWidget, ConfigurationPage, ConnectionWidget, ContentWindow, Controller, ControllerWindow, DeviceSkin, DisplayWidget, Document, DownloadItem, DragWidget, DragWidget, DropSiteWindow, EchoWindow, ExLineEdit, FileReader, FindWidget, FormExtractor, FormWidget, GammaView, GeneralTab, GoogleChat, GradientEditor, GradientWidget, HelpDialog, HelpWindow, IconPreviewArea, ImageComposer, Images, IndexWindow, KAsteroidsView, LineNumberArea, MainWindow, MainWindow, MandelbrotWidget, MediaPlayer, MoviePlayer, MultiPageWidget, MyActiveX, MyClass, MyWidget, MyWidget, MyWidget, MyWidget, MyWidget, MyWidget, MyWidget, NewAddressTab, PaintArea, PaintWidget, ParameterEdit, PathDeformControls, PathDeformWidget, PathStrokeControls, PathStrokeWidget, PermissionsTab, Phonon::DS9::VideoWindow, Phonon::EffectWidget, Phonon::Gstreamer::OverlayWidget, Phonon::Gstreamer::VideoWidget, Phonon::SeekSlider, Phonon::VideoPlayer, Phonon::VideoWidget, Phonon::VolumeSlider, Previewer, PreviewWindow, PrintPanel, PuzzleWidget, PuzzleWidget, Q3ComboBox, Q3DataBrowser, Q3DataView, Q3DateTimeEdit, Q3DateTimeEditBase, Q3DateTimeEditor, Q3DockArea, Q3DockWindowHandle, Q3DockWindowResizeHandle, Q3Header, Q3MainWindow, Q3SpinWidget, Q3TitleBar, Q3ToolBarExtensionWidget, Q3ToolBarSeparator, Q3WidgetStackPrivate::Invisible, QAbstractButton, QAbstractFormBuilderGadget, QAbstractScrollAreaScrollBarContainer, QAbstractScrollAreaWidget, QAbstractSlider, QAbstractSpinBox, QAccessWidget, QBalloonTip, QCalendarPopup, QCalendarWidget, QClipperWidget, QColorLuminancePicker, QColorShower, QColumnViewGrip, QComboBox, QComboBoxPrivateScroller, QContext2DCanvas, QDBusViewer, qdesigner_internal::BrushEditor, qdesigner_internal::DPI_Chooser, qdesigner_internal::EmbeddedOptionsControl, qdesigner_internal::FilterWidget, qdesigner_internal::FriendlyWidget, qdesigner_internal::GridPanel, qdesigner_internal::IconSelector, qdesigner_internal::InvisibleWidget, qdesigner_internal::PixmapEditor, qdesigner_internal::PreviewWidget, qdesigner_internal::ResetWidget, qdesigner_internal::RoleEditor, qdesigner_internal::SignalSlotEditorWindow, qdesigner_internal::TabOrderEditor, qdesigner_internal::TemplateOptionsWidget, qdesigner_internal::TextEditor, qdesigner_internal::TextPropertyEditor, QDesignerActionEditorInterface, QDesignerAppearanceOptionsWidget, QDesignerFormWindow, QDesignerFormWindowInterface, QDesignerNewFormWidgetInterface, QDesignerObjectInspectorInterface, QDesignerPropertyEditorInterface, QDesignerResourceBrowserInterface, QDesignerWidget, QDesignerWidgetBoxInterface, QDesktopWidget, QDialog, QDialogButtonBox, QDockWidget, QETWidget, QExtraWidget, QFDProgressAnimation, QFocusFrame, QFocusHelper, QFrame, QGLWidget, QGroupBox, QHackWidget, QHelpSearchQueryWidget, QHelpSearchResultWidget, QHideDock, QLayoutWidget, QLineEdit, QMainWindow, QMdi::ControlLabel, QMdi::ControllerWidget, QMDIControl, QMdiSubWindow, QMenu, QMenuBar, QMessageBoxDetailsText, QPagePreview, QPageSetupWidget, QPixelTool, QPrintPreviewWidget, QProgressBar, QRubberBand, QScriptBreakpointsWidgetInterface, QScriptDebuggerCodeFinderWidgetInterface, QScriptDebuggerCodeViewInterface, QScriptDebuggerCodeWidgetInterface, QScriptDebuggerLocalsWidgetInterface, QScriptDebuggerScriptsWidgetInterface, QScriptDebuggerStackWidgetInterface, QScriptEditExtraArea, QScriptNewBreakpointWidget, QShapedPixmapWidget, QSingleDesktopWidget, QSizeGrip, QSplashScreen, QSplitterHandle, QStatusBar, QSvgWidget, QT_BEGIN_NAMESPACE::CommandLine, QTabBar, QtAbstractPropertyBrowser, QTabWidget, QtBoolEdit, QtCharEdit, QtColorEditWidget, QtColorLine, QTextDetailPopup, QtFontEditWidget, QtFriendlyLayoutWidget, QtGradientEditor, QtGradientView, QtGradientWidget, QtKeySequenceEdit, QToolBar, QToolBarSeparator, QtResourceView, QueryPage, qvfb_internal::CursorWindow, QVFbAbstractView, QView3D, QWebView, QWellArray, QWhatsThat, QWizardAntiFlickerWidget, QWizardHeader, QWizardPage, QWorkspace, QWorkspaceChild, QWorkspaceTitleBar, QX11EmbedContainer, QX11EmbedWidget, RenderArea, RenderArea, RenderArea, RenderArea, RSSListing, RSSListing, Screenshot, ScribbleArea, SearchWidget, ShadeWidget, ShapedClock, SimpleTransformation, SimpleTransformation, SortingBox, SourceWidget, Spacer, SslClient, StarEditor, StyleWidget, StyleWindow, TabbedBrowser, TabletCanvas, TetrixWindow, TextFinder, TicTacToe, UpdatePage, ValidatorWidget, Widget, Widget, Widget, Widget, Widget, Widget, Widget, Widget, WigglyWidget, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, Window, WorldTimeClock, XFormWidget, and Zoomer.

Collaboration diagram for QWidget:
Collaboration graph

List of all members.

Public Types

enum  PaintDeviceMetric {
  PdmWidth = 1, PdmHeight, PdmWidthMM, PdmHeightMM,
  PdmNumColors, PdmDepth, PdmDpiX, PdmDpiY,
  PdmPhysicalDpiX, PdmPhysicalDpiY
enum  RenderFlag { DrawWindowBackground = 0x1, DrawChildren = 0x2, IgnoreMask = 0x4 }

Public Slots

bool close ()
void hide ()
void lower ()
void raise ()
void repaint ()
void setDisabled (bool)
void setEnabled (bool)
void setFocus ()
void setHidden (bool hidden)
QT_MOC_COMPAT void setShown (bool shown)
void setStyleSheet (const QString &styleSheet)
virtual void setVisible (bool visible)
void setWindowModified (bool)
void setWindowTitle (const QString &)
void show ()
void showFullScreen ()
void showMaximized ()
void showMinimized ()
void showNormal ()
void update ()


void customContextMenuRequested (const QPoint &pos)

Public Member Functions

bool acceptDrops () const
QString accessibleDescription () const
QString accessibleName () const
QList< QAction * > actions () const
void activateWindow ()
void addAction (QAction *action)
void addActions (QList< QAction * > actions)
void adjustSize ()
bool autoFillBackground () const
QPalette::ColorRole backgroundRole () const
QSize baseSize () const
QWidgetchildAt (const QPoint &p) const
QWidgetchildAt (int x, int y) const
QRect childrenRect () const
QRegion childrenRegion () const
void clearFocus ()
void clearMask ()
QRect contentsRect () const
Qt::ContextMenuPolicy contextMenuPolicy () const
void createWinId ()
QCursor cursor () const
int depth () const
int devType () const
WId effectiveWinId () const
void ensurePolished () const
Qt::FocusPolicy focusPolicy () const
QWidgetfocusProxy () const
QWidgetfocusWidget () const
const QFontfont () const
QFontInfo fontInfo () const
QFontMetrics fontMetrics () const
QPalette::ColorRole foregroundRole () const
QRect frameGeometry () const
QSize frameSize () const
const QRectgeometry () const
void getContentsMargins (int *left, int *top, int *right, int *bottom) const
void grabKeyboard ()
void grabMouse ()
void grabMouse (const QCursor &)
int grabShortcut (const QKeySequence &key, Qt::ShortcutContext context=Qt::WindowShortcut)
QGraphicsProxyWidgetgraphicsProxyWidget () const
Qt::HANDLE handle () const
bool hasFocus () const
bool hasMouseTracking () const
int height () const
virtual int heightForWidth (int) const
int heightMM () const
QInputContextinputContext ()
virtual QVariant inputMethodQuery (Qt::InputMethodQuery) const
void insertAction (QAction *before, QAction *action)
void insertActions (QAction *before, QList< QAction * > actions)
WId internalWinId () const
bool isActiveWindow () const
bool isAncestorOf (const QWidget *child) const
bool isEnabled () const
bool isEnabledTo (QWidget *) const
bool isEnabledToTLW () const
bool isFullScreen () const
bool isHidden () const
bool isLeftToRight () const
bool isMaximized () const
bool isMinimized () const
bool isModal () const
bool isRightToLeft () const
bool isTopLevel () const
bool isVisible () const
bool isVisibleTo (QWidget *) const
bool isWindow () const
bool isWindowModified () const
QLayoutlayout () const
Qt::LayoutDirection layoutDirection () const
QLocale locale () const
int logicalDpiX () const
int logicalDpiY () const
QPoint mapFrom (QWidget *, const QPoint &) const
QPoint mapFromGlobal (const QPoint &) const
QPoint mapFromParent (const QPoint &) const
QPoint mapTo (QWidget *, const QPoint &) const
QPoint mapToGlobal (const QPoint &) const
QPoint mapToParent (const QPoint &) const
QRegion mask () const
int maximumHeight () const
QSize maximumSize () const
int maximumWidth () const
int minimumHeight () const
QSize minimumSize () const
virtual QSize minimumSizeHint () const
int minimumWidth () const
void move (int x, int y)
void move (const QPoint &)
QWidgetnativeParentWidget () const
QWidgetnextInFocusChain () const
QRect normalGeometry () const
int numColors () const
void overrideWindowFlags (Qt::WindowFlags type)
void overrideWindowState (Qt::WindowStates state)
QPaintEnginepaintEngine () const
bool paintingActive () const
const QPalettepalette () const
QWidgetparentWidget () const
int physicalDpiX () const
int physicalDpiY () const
QPoint pos () const
 QWidget (QWidget *parent=0, Qt::WindowFlags f=0)
QRect rect () const
void releaseKeyboard ()
void releaseMouse ()
void releaseShortcut (int id)
void removeAction (QAction *action)
void render (QPaintDevice *target, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground|DrawChildren))
void render (QPainter *painter, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground|DrawChildren))
void repaint (int x, int y, int w, int h)
void repaint (const QRect &)
void repaint (const QRegion &)
void resize (int w, int h)
void resize (const QSize &)
bool restoreGeometry (const QByteArray &geometry)
QByteArray saveGeometry () const
void scroll (int dx, int dy, const QRect &)
void scroll (int dx, int dy)
void setAcceptDrops (bool on)
void setAccessibleDescription (const QString &description)
void setAccessibleName (const QString &name)
void setAttribute (Qt::WidgetAttribute, bool on=true)
void setAutoFillBackground (bool enabled)
void setBackgroundRole (QPalette::ColorRole)
void setBaseSize (const QSize &)
void setBaseSize (int basew, int baseh)
void setContentsMargins (int left, int top, int right, int bottom)
void setContextMenuPolicy (Qt::ContextMenuPolicy policy)
void setCursor (const QCursor &)
void setFixedHeight (int h)
void setFixedSize (const QSize &)
void setFixedSize (int w, int h)
void setFixedWidth (int w)
void setFocus (Qt::FocusReason reason)
void setFocusPolicy (Qt::FocusPolicy policy)
void setFocusProxy (QWidget *)
void setFont (const QFont &)
void setForegroundRole (QPalette::ColorRole)
void setGeometry (const QRect &)
void setGeometry (int x, int y, int w, int h)
void setInputContext (QInputContext *)
void setLayout (QLayout *)
void setLayoutDirection (Qt::LayoutDirection direction)
void setLocale (const QLocale &locale)
void setMask (const QBitmap &)
void setMask (const QRegion &)
void setMaximumHeight (int maxh)
void setMaximumSize (const QSize &)
void setMaximumSize (int maxw, int maxh)
void setMaximumWidth (int maxw)
void setMinimumHeight (int minh)
void setMinimumSize (const QSize &)
void setMinimumSize (int minw, int minh)
void setMinimumWidth (int minw)
void setMouseTracking (bool enable)
void setPalette (const QPalette &)
void setParent (QWidget *parent)
void setParent (QWidget *parent, Qt::WindowFlags f)
void setShortcutAutoRepeat (int id, bool enable=true)
void setShortcutEnabled (int id, bool enable=true)
void setSizeIncrement (const QSize &)
void setSizeIncrement (int w, int h)
void setSizePolicy (QSizePolicy)
void setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical)
void setStatusTip (const QString &)
void setStyle (QStyle *)
void setToolTip (const QString &)
void setUpdatesEnabled (bool enable)
void setWhatsThis (const QString &)
void setWindowFilePath (const QString &filePath)
void setWindowFlags (Qt::WindowFlags type)
void setWindowIcon (const QIcon &icon)
void setWindowIconText (const QString &)
void setWindowModality (Qt::WindowModality windowModality)
void setWindowOpacity (qreal level)
void setWindowRole (const QString &)
void setWindowState (Qt::WindowStates state)
void setWindowSurface (QWindowSurface *surface)
QSize size () const
virtual QSize sizeHint () const
QSize sizeIncrement () const
QSizePolicy sizePolicy () const
void stackUnder (QWidget *)
QString statusTip () const
QStylestyle () const
QString styleSheet () const
bool testAttribute (Qt::WidgetAttribute) const
QString toolTip () const
QWidgettopLevelWidget () const
bool underMouse () const
void unsetCursor ()
void unsetLayoutDirection ()
void unsetLocale ()
void update (const QRegion &)
void update (const QRect &)
void update (int x, int y, int w, int h)
void updateGeometry ()
bool updatesEnabled () const
QRegion visibleRegion () const
QString whatsThis () const
int width () const
int widthMM () const
QWidgetwindow () const
QString windowFilePath () const
Qt::WindowFlags windowFlags () const
QIcon windowIcon () const
QString windowIconText () const
Qt::WindowModality windowModality () const
qreal windowOpacity () const
QString windowRole () const
Qt::WindowStates windowState () const
QWindowSurfacewindowSurface () const
QString windowTitle () const
Qt::WindowType windowType () const
WId winId () const
int x () const
int y () const
 ~QWidget ()

Static Public Member Functions

static QWidgetfind (WId)
static QWidgetkeyboardGrabber ()
static QWidgetmouseGrabber ()
static void setTabOrder (QWidget *, QWidget *)

Protected Slots

void updateMicroFocus ()

Protected Member Functions

virtual void actionEvent (QActionEvent *)
virtual void changeEvent (QEvent *)
virtual void closeEvent (QCloseEvent *)
virtual void contextMenuEvent (QContextMenuEvent *)
void create (WId=0, bool initializeWindow=true, bool destroyOldWindow=true)
void destroy (bool destroyWindow=true, bool destroySubWindows=true)
virtual void dragEnterEvent (QDragEnterEvent *)
virtual void dragLeaveEvent (QDragLeaveEvent *)
virtual void dragMoveEvent (QDragMoveEvent *)
virtual void dropEvent (QDropEvent *)
virtual void enabledChange (bool)
virtual void enterEvent (QEvent *)
bool event (QEvent *)
virtual void focusInEvent (QFocusEvent *)
bool focusNextChild ()
virtual bool focusNextPrevChild (bool next)
virtual void focusOutEvent (QFocusEvent *)
bool focusPreviousChild ()
virtual void fontChange (const QFont &)
virtual void hideEvent (QHideEvent *)
virtual void inputMethodEvent (QInputMethodEvent *)
virtual void keyPressEvent (QKeyEvent *)
virtual void keyReleaseEvent (QKeyEvent *)
virtual void languageChange ()
virtual void leaveEvent (QEvent *)
int metric (PaintDeviceMetric) const
virtual void mouseDoubleClickEvent (QMouseEvent *)
virtual void mouseMoveEvent (QMouseEvent *)
virtual void mousePressEvent (QMouseEvent *)
virtual void mouseReleaseEvent (QMouseEvent *)
virtual void moveEvent (QMoveEvent *)
virtual void paintEvent (QPaintEvent *)
virtual void paletteChange (const QPalette &)
 QWidget (QWidgetPrivate &d, QWidget *parent, Qt::WindowFlags f)
void resetInputContext ()
virtual void resizeEvent (QResizeEvent *)
virtual void showEvent (QShowEvent *)
virtual void styleChange (QStyle &)
virtual void tabletEvent (QTabletEvent *)
virtual void wheelEvent (QWheelEvent *)
virtual void windowActivationChange (bool)

Protected Attributes

ushort painters


bool acceptDrops
 whether drop events are enabled for this widget
QString accessibleDescription
 the widget's description as seen by assistive technologies
QString accessibleName
 the widget's name as seen by assistive technologies
bool autoFillBackground
 whether the widget background is filled automatically
QSize baseSize
 the base size of the widget
QRect childrenRect
 the bounding rectangle of the widget's children
QRegion childrenRegion
 the combined region occupied by the widget's children
Qt::ContextMenuPolicy contextMenuPolicy
 how the widget shows a context menu
QCursor cursor
 the cursor shape for this widget
bool enabled
 whether the widget is enabled
bool focus
 whether this widget (or its focus proxy) has the keyboard input focus
Qt::FocusPolicy focusPolicy
 the way the widget accepts keyboard focus
QFont font
 the font currently set for the widget
QRect frameGeometry
 geometry of the widget relative to its parent including any window frame
QSize frameSize
 the size of the widget including any window frame
bool fullScreen
 whether the widget is shown in full screen mode
QRect geometry
 the geometry of the widget relative to its parent and excluding the window frame
int height
 the height of the widget excluding any window frame
bool isActiveWindow
 whether this widget's window is the active window
Qt::LayoutDirection layoutDirection
 the layout direction for this widget
QLocale locale
 the widget's locale
bool maximized
 whether this widget is maximized
int maximumHeight
 the widget's maximum height in pixels
QSize maximumSize
 the widget's maximum size in pixels
int maximumWidth
 the widget's maximum width in pixels
bool minimized
 whether this widget is minimized (iconified)
int minimumHeight
 the widget's minimum height in pixels
QSize minimumSize
 the widget's minimum size
QSize minimumSizeHint
 the recommended minimum size for the widget
int minimumWidth
 the widget's minimum width in pixels
bool modal
 whether the widget is a modal widget
bool mouseTracking
 whether mouse tracking is enabled for the widget
QRect normalGeometry
 the geometry of the widget as it will appear when shown as a normal (not maximized or full screen) top-level widget
QPalette palette
 the widget's palette
QPoint pos
 the position of the widget within its parent widget
QRect rect
 the internal geometry of the widget excluding any window frame
QSize size
 the size of the widget excluding any window frame
QSize sizeHint
 the recommended size for the widget
QSize sizeIncrement
 the size increment of the widget
QSizePolicy sizePolicy
 the default layout behavior of the widget
QString statusTip
 the widget's status tip
QString styleSheet
 the widget's style sheet
QString toolTip
 the widget's tooltip
bool updatesEnabled
 whether updates are enabled
bool visible
 whether the widget is visible
QString whatsThis
 the widget's What's This help text.
int width
 the width of the widget excluding any window frame
QString windowFilePath
 the file path associated with a widget
QIcon windowIcon
 the widget's icon
QString windowIconText
 the widget's icon text
Qt::WindowModality windowModality
 which windows are blocked by the modal widget
bool windowModified
 whether the document shown in the window has unsaved changes
double windowOpacity
 The level of opacity for the window.
QString windowTitle
 the window title (caption)
int x
 the x coordinate of the widget relative to its parent including any window frame
int y
 the y coordinate of the widget relative to its parent and including any window frame

Private Member Functions

 Q_PRIVATE_SLOT (d_func(), void _q_showIfNotHidden()) QWidgetData *data
QLayouttakeLayout ()
bool testAttribute_helper (Qt::WidgetAttribute) const


class QApplication
class QApplicationPrivate
class QBackingStoreDevice
class QBaseApplication
class QD3DWindowSurface
class QETWidget
class QFontInfo
class QFontMetrics
class QGLContext
class QGLWidget
class QGLWindowSurface
class QGraphicsProxyWidget
class QGraphicsProxyWidgetPrivate
class QLayout
class QPainter
class QPainterPrivate
class QPixmap
class QShortcutMap
class QShortcutPrivate
class QStyleSheetStyle
Q_GUI_EXPORT QWidgetDataqt_qwidget_data (QWidget *widget)
Q_GUI_EXPORT QWidgetPrivateqt_widget_private (QWidget *widget)
class QVGWindowSurface
class QWidgetBackingStore
class QWidgetItem
class QWidgetItemV2
class QWin32PaintEngine
class QWindowSurface
class QX11PaintEngine

Related Functions

(Note that these are not member functions.)

const Q_GUI_EXPORT QX11Infoqt_x11Info (const QPaintDevice *pd)

Detailed Description

The QWidget class is the base class of all user interface objects.

The widget is the atom of the user interface: it receives mouse, keyboard and other events from the window system, and paints a representation of itself on the screen. Every widget is rectangular, and they are sorted in a Z-order. A widget is clipped by its parent and by the widgets in front of it.

A widget that is not embedded in a parent widget is called a window. Usually, windows have a frame and a title bar, although it is also possible to create windows without such decoration using suitable {Qt::WindowFlags}{window flags}). In Qt, QMainWindow and the various subclasses of QDialog are the most common window types.

Every widget's constructor accepts one or two standard arguments:

1 {QWidget *parent = 0} is the parent of the new widget. If it is 0 (the default), the new widget will be a window. If not, it will be a child of parent, and be constrained by parent's geometry (unless you specify Qt::Window as window flag). {Qt::WindowFlags f = 0} (where available) sets the window flags; the default is suitable for almost all widgets, but to get, for example, a window without a window system frame, you must use special flags.

QWidget has many member functions, but some of them have little direct functionality; for example, QWidget has a font property, but never uses this itself. There are many subclasses which provide real functionality, such as QLabel, QPushButton, QListWidget, and QTabWidget.

Definition at line 141 of file qwidget.h.

The documentation for this class was generated from the following files:

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