The QLabel widget provides a text or image display. More...

Inheritance diagram for QLabel:

Public Signals
void	linkActivated (const QString &link)

void	linkHovered (const QString &link)

Public Signals inherited from QWidget
void	customContextMenuRequested (const QPoint &pos)

void	windowIconChanged (const QIcon &icon)

void	windowIconTextChanged (const QString &iconText)

void	windowTitleChanged (const QString &title)

Public Signals inherited from QObject
void	destroyed (QObject *obj=nullptr)

void	objectNameChanged (const QString &objectName)

Public Slots
void	clear ()

void	setMovie (QMovie *movie)

void	setNum (double num)

void	setNum (int num)

void	setPicture (const QPicture &picture)

void	setPixmap (const QPixmap &pixmap)

void	setText (const QString &text)

Public Slots inherited from QWidget
bool	close ()

void	hide ()

void	lower ()

void	raise ()

void	repaint ()

void	setDisabled (bool disable)

void	setEnabled (bool enable)

void	setFocus ()

void	setHidden (bool hidden)

void	setStyleSheet (const QString &styleSheet)

virtual void	setVisible (bool visible)

void	setWindowModified (bool modified)

void	setWindowTitle (const QString &title)

void	show ()

void	showFullScreen ()

void	showMaximized ()

void	showMinimized ()

void	showNormal ()

void	update ()

Public Slots inherited from QObject
void	deleteLater ()

Public Methods
	QLabel (const QString &text, QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

	QLabel (QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

	~QLabel ()

Qt::Alignment	alignment () const

QWidget *	buddy () const

bool	hasScaledContents () const

bool	hasSelectedText () const

int	heightForWidth (int width) const override

int	indent () const

int	margin () const

QSize	minimumSizeHint () const override

QMovie *	movie () const

bool	openExternalLinks () const

const QPicture *	picture () const

const QPixmap *	pixmap () const

QString	selectedText () const

int	selectionStart () const

void	setAlignment (Qt::Alignment alignment)

void	setBuddy (QWidget *buddy)

void	setIndent (int indent)

void	setMargin (int margin)

void	setOpenExternalLinks (bool open)

void	setScaledContents (bool enabled)

void	setSelection (int start, int length)

void	setTextFormat (Qt::TextFormat format)

void	setTextInteractionFlags (Qt::TextInteractionFlags flags)

void	setWordWrap (bool enabled)

QSize	sizeHint () const override

QString	text () const

Qt::TextFormat	textFormat () const

Qt::TextInteractionFlags	textInteractionFlags () const

bool	wordWrap () const

Public Methods inherited from QFrame
	QFrame (QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

	~QFrame ()

QRect	frameRect () const

Shadow	frameShadow () const

Shape	frameShape () const

int	frameStyle () const

int	frameWidth () const

int	lineWidth () const

int	midLineWidth () const

void	setFrameRect (const QRect &rect)

void	setFrameShadow (Shadow value)

void	setFrameShape (Shape value)

void	setFrameStyle (int style)

void	setLineWidth (int width)

void	setMidLineWidth (int width)

Public Methods inherited from QWidget
	QWidget (QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

	~QWidget ()

bool	acceptDrops () const

QString	accessibleDescription () const

QString	accessibleName () const

QList< QAction * >	actions () const

void	activateWindow ()

void	addAction (QAction *action)

void	addActions (const QList< QAction * > &actions)

void	adjustSize ()

bool	autoFillBackground () const

QPalette::ColorRole	backgroundRole () const

QBackingStore *	backingStore () const

QSize	baseSize () const

QWidget *	childAt (const QPoint &position) const

QWidget *	childAt (int x, int y) const

QRect	childrenRect () const

QRegion	childrenRegion () const

void	clearFocus ()

void	clearMask ()

QMargins	contentsMargins () const

QRect	contentsRect () const

Qt::ContextMenuPolicy	contextMenuPolicy () const

QCursor	cursor () const

WId	effectiveWinId () const

void	ensurePolished () const

Qt::FocusPolicy	focusPolicy () const

QWidget *	focusProxy () const

QWidget *	focusWidget () const

const QFont &	font () const

QFontInfo	fontInfo () const

QFontMetrics	fontMetrics () const

QPalette::ColorRole	foregroundRole () const

QRect	frameGeometry () const

QSize	frameSize () const

const QRect &	geometry () const

void	getContentsMargins (int left, int top, int right, int bottom) const

QPixmap	grab (const QRect &rectangle=QRect (QPoint (0, 0), QSize (-1,-1)))

void	grabGesture (Qt::GestureType gestureType, Qt::GestureFlags flags=Qt::GestureFlags ())

void	grabKeyboard ()

void	grabMouse ()

void	grabMouse (const QCursor &cursor)

int	grabShortcut (const QKeySequence &key, Qt::ShortcutContext context=Qt::WindowShortcut)

QGraphicsEffect *	graphicsEffect () const

QGraphicsProxyWidget *	graphicsProxyWidget () const

bool	hasEditFocus () const

bool	hasFocus () const

virtual bool	hasHeightForWidth () const

bool	hasMouseTracking () const

int	height () const

Qt::InputMethodHints	inputMethodHints () const

virtual QVariant	inputMethodQuery (Qt::InputMethodQuery query) const

void	insertAction (QAction before, QAction action)

void	insertActions (QAction before, QList< QAction > actions)

bool	isActiveWindow () const

bool	isAncestorOf (const QWidget *child) const

bool	isEnabled () const

bool	isEnabledTo (const QWidget *parent) const

bool	isEnabledToTLW () const

bool	isFullScreen () const

bool	isHidden () const

bool	isMaximized () const

bool	isMinimized () const

bool	isModal () const

bool	isTopLevel () const

bool	isVisible () const

bool	isVisibleTo (const QWidget *parent) const

bool	isWindow () const

bool	isWindowModified () const

QLayout *	layout () const

Qt::LayoutDirection	layoutDirection () const

QLocale	locale () const

QPoint	mapFrom (const QWidget *parent, const QPoint &pos) const

QPoint	mapFromGlobal (const QPoint &pos) const

QPoint	mapFromParent (const QPoint &pos) const

QPoint	mapTo (const QWidget *parent, const QPoint &pos) const

QPoint	mapToGlobal (const QPoint &pos) const

QPoint	mapToParent (const QPoint &pos) const

QRegion	mask () const

int	maximumHeight () const

QSize	maximumSize () const

int	maximumWidth () const

int	minimumHeight () const

QSize	minimumSize () const

int	minimumWidth () const

void	move (const QPoint &point)

void	move (int x, int y)

QWidget *	nativeParentWidget () const

QWidget *	nextInFocusChain () const

QRect	normalGeometry () const

void	overrideWindowFlags (Qt::WindowFlags flags)

QPaintEngine *	paintEngine () const override

const QPalette &	palette () const

QWidget *	parentWidget () const

QPoint	pos () const

QWidget *	previousInFocusChain () const

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 (const QRect &rect)

void	repaint (const QRegion &region)

void	repaint (int x, int y, int w, int h)

void	resize (const QSize &size)

void	resize (int w, int h)

bool	restoreGeometry (const QByteArray &geometry)

QByteArray	saveGeometry () const

void	scroll (int dx, int dy)

void	scroll (int dx, int dy, const QRect &rect)

void	setAcceptDrops (bool on)

void	setAccessibleDescription (const QString &description)

void	setAccessibleName (const QString &name)

void	setAttribute (Qt::WidgetAttribute attribute, bool enable=true)

void	setAutoFillBackground (bool enable)

void	setBackgroundRole (QPalette::ColorRole role)

void	setBaseSize (const QSize &size)

void	setBaseSize (int basew, int baseh)

void	setContentsMargins (const QMargins &margins)

void	setContentsMargins (int left, int top, int right, int bottom)

void	setContextMenuPolicy (Qt::ContextMenuPolicy policy)

void	setCursor (const QCursor &cursor)

void	setEditFocus (bool enable)

void	setFixedHeight (int h)

void	setFixedSize (const QSize &size)

void	setFixedSize (int w, int h)

void	setFixedWidth (int w)

void	setFocus (Qt::FocusReason reason)

void	setFocusPolicy (Qt::FocusPolicy policy)

void	setFocusProxy (QWidget *widget)

void	setFont (const QFont &font)

void	setForegroundRole (QPalette::ColorRole role)

void	setGeometry (const QRect &rect)

void	setGeometry (int x, int y, int w, int h)

void	setGraphicsEffect (QGraphicsEffect *effect)

void	setInputMethodHints (Qt::InputMethodHints hints)

void	setLayout (QLayout *layout)

void	setLayoutDirection (Qt::LayoutDirection direction)

void	setLocale (const QLocale &locale)

void	setMask (const QBitmap &bitmap)

void	setMask (const QRegion &region)

void	setMaximumHeight (int maxh)

void	setMaximumSize (const QSize &size)

void	setMaximumSize (int maxw, int maxh)

void	setMaximumWidth (int maxw)

void	setMinimumHeight (int minh)

void	setMinimumSize (const QSize &size)

void	setMinimumSize (int minw, int minh)

void	setMinimumWidth (int minw)

void	setMouseTracking (bool enable)

void	setPalette (const QPalette &palette)

void	setParent (QWidget *parent)

void	setParent (QWidget *parent, Qt::WindowFlags flags)

void	setShortcutAutoRepeat (int id, bool enable=true)

void	setShortcutEnabled (int id, bool enable=true)

void	setSizeIncrement (const QSize &size)

void	setSizeIncrement (int w, int h)

void	setSizePolicy (QSizePolicy policy)

void	setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical)

void	setStatusTip (const QString &data)

void	setStyle (QStyle *style)

void	setToolTip (const QString &data)

void	setToolTipDuration (int msec)

void	setUpdatesEnabled (bool enable)

void	setWhatsThis (const QString &str)

void	setWindowFilePath (const QString &filePath)

void	setWindowFlags (Qt::WindowFlags flags)

void	setWindowIcon (const QIcon &icon)

void	setWindowModality (Qt::WindowModality windowModality)

void	setWindowOpacity (qreal level)

void	setWindowRole (const QString &role)

void	setWindowState (Qt::WindowStates windowState)

QSize	size () const

QSize	sizeIncrement () const

QSizePolicy	sizePolicy () const

void	stackUnder (QWidget *widget)

QString	statusTip () const

QStyle *	style () const

QString	styleSheet () const

bool	testAttribute (Qt::WidgetAttribute attribute) const

QString	toolTip () const

int	toolTipDuration () const

QWidget *	topLevelWidget () const

bool	underMouse () const

void	ungrabGesture (Qt::GestureType gestureType)

void	unsetCursor ()

void	unsetLayoutDirection ()

void	unsetLocale ()

void	update (const QRect &rect)

void	update (const QRegion &region)

void	update (int x, int y, int w, int h)

void	updateGeometry ()

bool	updatesEnabled () const

QRegion	visibleRegion () const

QString	whatsThis () const

int	width () const

QWidget *	window () const

QString	windowFilePath () const

Qt::WindowFlags	windowFlags () const

QWindow *	windowHandle () const

QIcon	windowIcon () const

Qt::WindowModality	windowModality () const

qreal	windowOpacity () const

QString	windowRole () const

Qt::WindowStates	windowState () const

QString	windowTitle () const

Qt::WindowType	windowType () const

WId	winId () const

int	x () const

int	y () const

Public Methods inherited from QObject
	QObject (QObject *parent=nullptr)

	~QObject ()

bool	blockSignals (bool block)

const QList< QObject * > &	children () const

bool	connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QString >	dynamicPropertyNames () const

virtual bool	event (QEvent *event)

virtual bool	eventFilter (QObject watched, QEvent event)

template<typename T >
T	findChild (const QString &childName=QString ()) const

template<class T >
QList< T >	findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

template<class T >
QList< T >	findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

bool	inherits (const QString &className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

QObject *	parent () const

template<class T = QVariant>
T	property (const QString &name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const QString &name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)

QThread *	thread () const

Public Methods inherited from QPaintDevice
virtual	~QPaintDevice ()

int	colorCount () const

int	depth () const

int	devicePixelRatio () const

qreal	devicePixelRatioF () const

int	height () const

int	heightMM () const

int	logicalDpiX () const

int	logicalDpiY () const

bool	paintingActive () const

int	physicalDpiX () const

int	physicalDpiY () const

int	width () const

int	widthMM () const

Protected Methods
void	changeEvent (QEvent *event) override

void	contextMenuEvent (QContextMenuEvent *event) override

bool	event (QEvent *event) override

void	focusInEvent (QFocusEvent *event) override

bool	focusNextPrevChild (bool next) override

void	focusOutEvent (QFocusEvent *event) override

void	keyPressEvent (QKeyEvent *event) override

void	mouseMoveEvent (QMouseEvent *event) override

void	mousePressEvent (QMouseEvent *event) override

void	mouseReleaseEvent (QMouseEvent *event) override

void	paintEvent (QPaintEvent *event) override

Protected Methods inherited from QFrame
void	drawFrame (QPainter *painter)

bool	event (QEvent *event) override

void	initStyleOption (QStyleOptionFrame *option) const

Protected Methods inherited from QWidget
virtual void	actionEvent (QActionEvent *event)

virtual void	closeEvent (QCloseEvent *event)

void	create (WId window=0, bool initializeWindow=true, bool destroyOldWindow=true)

void	destroy (bool destroyWindow=true, bool destroySubWindows=true)

virtual void	dragEnterEvent (QDragEnterEvent *event)

virtual void	dragLeaveEvent (QDragLeaveEvent *event)

virtual void	dragMoveEvent (QDragMoveEvent *event)

virtual void	dropEvent (QDropEvent *event)

virtual void	enterEvent (QEvent *event)

bool	event (QEvent *event) override

bool	focusNextChild ()

bool	focusPreviousChild ()

virtual void	hideEvent (QHideEvent *event)

void	initPainter (QPainter *painter) const override

virtual void	inputMethodEvent (QInputMethodEvent *event)

virtual void	keyReleaseEvent (QKeyEvent *event)

virtual void	leaveEvent (QEvent *event)

int	metric (PaintDeviceMetric metric) const override

virtual void	mouseDoubleClickEvent (QMouseEvent *event)

virtual void	moveEvent (QMoveEvent *event)

virtual bool	nativeEvent (const QByteArray &eventType, void message, long result)

virtual void	resizeEvent (QResizeEvent *event)

virtual void	showEvent (QShowEvent *event)

virtual void	tabletEvent (QTabletEvent *event)

virtual void	wheelEvent (QWheelEvent *event)

Protected Methods inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signalMethod) const

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signalMethod) const

bool	isSignalConnected (const QMetaMethod &signalMethod) const

int	receivers (const QString &signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Protected Methods inherited from QPaintDevice
	QPaintDevice ()

Properties
	alignment

	hasSelectedText

	indent

	margin

	openExternalLinks

	pixmap

	scaledContents

	selectedText

	text

	textFormat

	textInteractionFlags

	wordWrap

Properties inherited from QFrame
	frameRect

	frameShadow

	frameShape

	frameWidth

	lineWidth

	midLineWidth

Properties inherited from QWidget
	acceptDrops

	accessibleDescription

	accessibleName

	autoFillBackground

	baseSize

	childrenRect

	childrenRegion

	contextMenuPolicy

	cursor

	enabled

	focus

	focusPolicy

	font

	frameGeometry

	frameSize

	fullScreen

	geometry

	height

	inputMethodHints

	isActiveWindow

	layoutDirection

	locale

	maximized

	maximumHeight

	maximumSize

	maximumWidth

	minimized

	minimumHeight

	minimumSize

	minimumSizeHint

	minimumWidth

	modal

	mouseTracking

	normalGeometry

	palette

	pos

	rect

	size

	sizeHint

	sizeIncrement

	sizePolicy

	statusTip

	styleSheet

	toolTip

	updatesEnabled

	visible

	whatsThis

	width

	windowFilePath

	windowFlags

	windowIcon

	windowIconText

	windowModality

	windowModified

	windowOpacity

	windowTitle

	x

	y

Properties inherited from QObject
	objectName

Additional Inherited Members
Public Typedefs inherited from QWidget
using	RenderFlags = QFlags< RenderFlag >

Public Types inherited from QFrame
enum	Shadow

enum	Shape

enum	StyleMask

Public Types inherited from QWidget
enum	RenderFlag

Public Types inherited from QPaintDevice
enum	PaintDeviceMetric

Static Public Methods inherited from QWidget
static QWidget *	createWindowContainer (QWindow window, QWidget parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

static QWidget *	find (WId id)

static QWidget *	keyboardGrabber ()

static QWidget *	mouseGrabber ()

static void	setTabOrder (QWidget firstWidget, QWidget secondWidget)

Static Public Methods inherited from QObject
static bool	connect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

static bool	connect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())

static bool	connect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, std::nullptr_t, const QObject receiver, std::nullptr_t)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...))

template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)

static QMetaObject &	staticMetaObject ()

static QString	tr (const char text, const char comment=nullptr, std::optional< int > numArg=std::optional< int >())

Protected Slots inherited from QWidget
void	updateMicroFocus ()

Related Functions inherited from QWidget
	QWidgetList

	WId

Related Functions inherited from QObject
T	qobject_cast (QObject *object)

	QObjectList

Detailed Description

The QLabel widget provides a text or image display. This class is used for displaying text or an image. No user interaction functionality is provided. The visual appearance of the label can be configured in various ways, and it can be used for specifying a focus mnemonic key for another widget.

A QLabel can contain any of the following content types.

Content	Setting
Plain text	Pass a QString to setText().
Rich text	Pass a QString that contains rich text to setText().
A pixmap	Pass a QPixmap to setPixmap().
A movie	Pass a QMovie to setMovie().
A number	Pass an int or a double to setNum(), which converts the number to plain text.
Nothing	The same as an empty plain text. This is the default. Set by clear().

Warning: When passing a QString to the constructor or calling setText(), make sure to sanitize your input, as QLabel tries to guess whether it displays the text as plain text or as rich text. You may want to call setTextFormat() explicitly, e.g. in case you expect the text to be in plain format but can not control the text source (for instance when displaying data loaded from the Web).

When the content is changed using any of these functions, any previous content is cleared.

By default, a QLabel displays text and images left aligned and vertically centered. A QLabel can be adjusted and fine-tuned in several ways. The positioning of the content within the QLabel widget area can be tuned with setAlignment() and setIndent(). Text content can also wrap lines along word boundaries with setWordWrap().

For example, this code sets up a sunken panel with a two-line text in the bottom right corner (both lines being flush with the right side of the label):

QLabel *label = new QLabel(this);
label->setFrameStyle(QFrame::Panel | QFrame::Sunken);
label->setText("first line\nsecond line");
label->setAlignment(Qt::AlignBottom | Qt::AlignRight);

The properties and functions QLabel inherits from QFrame can also be used to specify the widget frame to be used for any given label. A QLabel is often used as a label for an interactive widget. For this use QLabel provides a useful mechanism for adding an mnemonic (see QKeySequence) that will set the keyboard focus to the other widget (called the QLabel's "buddy").

QLineEdit* phoneEdit = new QLineEdit(this);
QLabel* phoneLabel = new QLabel("&Phone:", this);
phoneLabel->setBuddy(phoneEdit);

In this example, keyboard focus is transferred to the label's buddy (the QLineEdit) when the user presses Alt+P. If the buddy was a button (inheriting from QAbstractButton), triggering the mnemonic would emulate a button click.

	A label shown in the Windows XP widget style.
	A label shown in the Mac OS X widget style.
	A label shown in the Fusion widget style.

See also: QLineEdit, QTextEdit, QPixmap, QMovie

Constructor & Destructor Documentation

QLabel::QLabel	(	QWidget *	parent = `nullptr`,
		Qt::WindowFlags	flags = `Qt::EmptyFlag`
	)

explicit

Constructs an empty label. The parent and flags are passed to the QFrame constructor.

See also: setAlignment(), setFrameStyle(), setIndent()

QLabel::QLabel	(	const QString &	text,
		QWidget *	parent = `nullptr`,
		Qt::WindowFlags	flags = `Qt::EmptyFlag`
	)

explicit

Constructs a label that displays the text. The parent and flags arguments are passed to the QFrame constructor.

See also: setText(), setAlignment(), setFrameStyle(), setIndent()

QLabel::~QLabel ( )

Destroys the label.

Method Documentation

Qt::Alignment QLabel::alignment ( ) const

Returns the value of the property.

QWidget * QLabel::buddy ( ) const

Returns this label's buddy or a nullptr if no buddy is currently set.

See also: setBuddy()

void QLabel::changeEvent ( QEvent * event )

overrideprotectedvirtual

Reimplemented from QFrame::changeEvent()

void QLabel::clear ( )

slot

Clears any label contents.

void QLabel::contextMenuEvent ( QContextMenuEvent * event )

overrideprotectedvirtual

Reimplemented from QWidget::contextMenuEvent()

bool QLabel::event ( QEvent * event )

overrideprotected

Reimplemented from QWidget::event()

void QLabel::focusInEvent ( QFocusEvent * event )

overrideprotectedvirtual

Reimplemented from QWidget::focusInEvent()

bool QLabel::focusNextPrevChild ( bool next )

overrideprotectedvirtual

Reimplemented from QWidget::focusNextPrevChild()

void QLabel::focusOutEvent ( QFocusEvent * event )

overrideprotectedvirtual

Reimplemented from QWidget::focusOutEvent()

bool QLabel::hasScaledContents ( ) const

Returns the value of the property.

bool QLabel::hasSelectedText ( ) const

Returns the value of the property.

int QLabel::heightForWidth ( int width ) const

overridevirtual

Reimplemented from QWidget::heightForWidth()

int QLabel::indent ( ) const

Returns the value of the property.

void QLabel::keyPressEvent ( QKeyEvent * event )

overrideprotectedvirtual

Reimplemented from QWidget::keyPressEvent()

void QLabel::linkActivated ( const QString & link )

signal

This signal is emitted when the user clicks an html link. The link contains the URL.

See also: linkHovered()

void QLabel::linkHovered ( const QString & link )

signal

This signal is emitted when the user hovers over an html link. The link contains the URL.

See also: linkActivated()

int QLabel::margin ( ) const

Returns the value of the property.

QSize QLabel::minimumSizeHint ( ) const

overridevirtual

Reimplemented from QWidget::minimumSizeHint()

void QLabel::mouseMoveEvent ( QMouseEvent * event )

overrideprotectedvirtual

Reimplemented from QWidget::mouseMoveEvent()

void QLabel::mousePressEvent ( QMouseEvent * event )

overrideprotectedvirtual

Reimplemented from QWidget::mousePressEvent()

void QLabel::mouseReleaseEvent ( QMouseEvent * event )

overrideprotectedvirtual

Reimplemented from QWidget::mouseReleaseEvent()

QMovie * QLabel::movie ( ) const

Returns a pointer to the label's movie or nullptr if no movie has been set.

See also: setMovie()

bool QLabel::openExternalLinks ( ) const

Returns the value of the property.

void QLabel::paintEvent ( QPaintEvent * event )

overrideprotectedvirtual

Reimplemented from QFrame::paintEvent()

const QPicture * QLabel::picture ( ) const

Returns the label's picture or a nullptr if the label does not have a picture.

See also: setPicture()

const QPixmap * QLabel::pixmap ( ) const

Returns the value of the property.

QString QLabel::selectedText ( ) const

Returns the value of the property.

int QLabel::selectionStart ( ) const

This method () returns the index of the first selected character in the label or -1 if no text is selected.

Note: The textInteractionFlags set on the label need to include either TextSelectableByMouse or TextSelectableByKeyboard.

See also: selectedText()

void QLabel::setAlignment ( Qt::Alignment alignment )

Sets the value of the property to alignment

void QLabel::setBuddy ( QWidget * buddy )

Sets this label's buddy to buddy. When the user presses the shortcut key indicated by this label, the keyboard focus is transferred to the label's buddy widget. The buddy mechanism is only available for QLabels that contain text in which one character is prefixed with an ampersand, '&'. This character is set as the shortcut key. Refer to the QKeySequence::mnemonic() documentation for details.

In a dialog you might create two data entry widgets and a label for each, and set up the geometry layout so each label is just to the left of its data entry widget (its "buddy").

QLineEdit *nameEd  = new QLineEdit(this);
QLabel    *nameLb  = new QLabel("&Name:", this);
nameLb->setBuddy(nameEd);
 
QLineEdit *phoneEd = new QLineEdit(this);
QLabel    *phoneLb = new QLabel("&Phone:", this);
phoneLb->setBuddy(phoneEd);
// (layout setup not shown)

With the code above, the focus jumps to the Name field when the user presses Alt+N, and to the Phone field when the user presses Alt+P. To unset a previously set buddy call this method with buddy set to 0.

See also: buddy(), setText(), QShortcut, setAlignment()

void QLabel::setIndent ( int indent )

Sets the value of the property to indent.

void QLabel::setMargin ( int margin )

Sets the value of the property to margin.

void QLabel::setMovie ( QMovie * movie )

slot

Sets the label contents to movie. Any previous content is cleared. The label does not take ownership of the movie. The buddy shortcut, if any, is disabled.

See also: movie(), setBuddy()

void QLabel::setNum ( double num )

slot

Sets the label contents to plain text containing the textual representation of double num. Any previous content is cleared. Does nothing if the double's string representation is the same as the current contents of the label.

The buddy shortcut, if any, is disabled.

See also: setText(), QString8::number(), setBuddy()

void QLabel::setNum ( int num )

slot

Sets the label contents to plain text containing the textual representation of integer num. Any previous content is cleared. Does nothing if the integer's string representation is the same as the current contents of the label.

The buddy shortcut, if any, is disabled.

See also: setText(), QString8::number(), setBuddy()

void QLabel::setOpenExternalLinks ( bool open )

Sets the value of the property to open.

void QLabel::setPicture ( const QPicture & picture )

slot

Sets the label contents to picture. Any previous content is cleared. The buddy shortcut, if any, is disabled.

See also: picture(), setBuddy()

void QLabel::setPixmap ( const QPixmap & pixmap )

slot

Sets the value of the property to pixmap.

void QLabel::setScaledContents ( bool enabled )

Sets the value of the property to enabled.

void QLabel::setSelection	(	int	start,
		int	length
	)

Selects text from position start and for length characters.

Note: The textInteractionFlags set on the label need to include either TextSelectableByMouse or TextSelectableByKeyboard.

See also: selectedText()

void QLabel::setText ( const QString & text )

slot

Sets the value of the property to text.

void QLabel::setTextFormat ( Qt::TextFormat format )

Sets the value of the property to format.

void QLabel::setTextInteractionFlags ( Qt::TextInteractionFlags flags )

Sets the value of the property to flags.

void QLabel::setWordWrap ( bool enabled )

Sets the value of the property to enabled.

QSize QLabel::sizeHint ( ) const

overridevirtual

Reimplemented from QFrame::sizeHint()

QString QLabel::text ( ) const

Returns the value of the property.

Qt::TextFormat QLabel::textFormat ( ) const

Returns the value of the property.

Qt::TextInteractionFlags QLabel::textInteractionFlags ( ) const

Returns the value of the property.

bool QLabel::wordWrap ( ) const

Returns the value of the property.

Property Documentation

QLabel::alignment

This property holds the alignment of the label's contents. By default, the contents of the label are left-aligned and vertically-centered.

See also: text

Properties	Class Methods
read	alignment
write	setAlignment

QLabel::hasSelectedText

This property holds whether there is any text selected. Calling hasSelectedText() returns true if some or all of the text has been selected by the user, otherwise returns false. The textInteractionFlags set on the label need to include either TextSelectableByMouse or TextSelectableByKeyboard.

By default, this property is false.

See also: selectedText()

Properties	Class Methods
read	hasSelectedText

QLabel::indent

This property holds the label's text indent in pixels.

If a label displays text, the indent applies to the left edge if alignment() is Qt::AlignLeft, to the right edge if alignment() is Qt::AlignRight, to the top edge if alignment() is Qt::AlignTop, and to the bottom edge if alignment() is Qt::AlignBottom.

If indent is negative, or if no indent has been set, the label computes the effective indent as follows: If frameWidth() is 0, the effective indent becomes 0. If frameWidth() is greater than 0, the effective indent becomes half the width of the "x" character of the widget's current font().

By default, the indent is -1, meaning that an effective indent is calculating in the manner described above.

See also: alignment, margin, frameWidth(), font()

Properties	Class Methods
read	indent
write	setIndent

QLabel::margin

This property holds the width of the margin. The margin is the distance between the innermost pixel of the frame and the outermost pixel of contents.

The default margin is 0.

See also: indent

Properties	Class Methods
read	margin
write	setMargin

QLabel::openExternalLinks

Specifies whether QLabel should automatically open links using QDesktopServices::openUrl() instead of emitting the linkActivated() signal. The textInteractionFlags set on the label need to include either LinksAccessibleByMouse or LinksAccessibleByKeyboard.

The default value is false.

See also: textInteractionFlags()

Properties	Class Methods
read	openExternalLinks
write	setOpenExternalLinks

QLabel::pixmap

This property holds the label's pixmap.

If no pixmap has been set the property will contain a nullptr. Setting the pixmap clears any previous content. If there is a buddy shortcut it will be disabled.

Properties	Class Methods
read	pixmap
write	setPixmap

QLabel::scaledContents

This property holds whether the label will scale its contents to fill all available space. When enabled and the label shows a pixmap, it will scale the pixmap to fill the available space.

This property's default is false.

Properties	Class Methods
read	hasScaledContents
write	setScaledContents

QLabel::selectedText

This property holds the selected text. If there is no selected text this property's value is an empty string.

By default, this property contains an empty string.

Note: The textInteractionFlags set on the label need to include either TextSelectableByMouse or TextSelectableByKeyboard.

See also: hasSelectedText()

Properties	Class Methods
read	selectedText

QLabel::text

This property holds the label's text. If no text has been set this will return an empty string. Setting the text clears any previous content. The text will be interpreted either as plain text or as rich text, depending on the text format setting. The default setting is Qt::AutoText. If a buddy has been set the buddy mnemonic key is updated from the new text.

QLabel is well-suited to display small rich text documents, such as small documents that get their document specific settings (font, text color, link color) from the label's palette and font properties. For large documents, use QTextEdit in read-only mode instead. QTextEdit can also provide a scroll bar when necessary.

Note: This method enables mouse tracking if text contains rich text.

See also: setTextFormat(), setBuddy(), alignment

Properties	Class Methods
read	text
write	setText

QLabel::textFormat

This property holds the label's text format. Refer to th eQt::TextFormat enum for an explanation of the options. The default format is Qt::AutoText.

See also: text()

Properties	Class Methods
read	textFormat
write	setTextFormat

QLabel::textInteractionFlags

Specifies how the label should interact with user input if it displays text. If the flags contain Qt::LinksAccessibleByKeyboard the focus policy is also automatically set to Qt::StrongFocus. If Qt::TextSelectableByKeyboard is set then the focus policy is set to Qt::ClickFocus.

The default value is Qt::LinksAccessibleByMouse.

Properties	Class Methods
read	textInteractionFlags
write	setTextInteractionFlags

QLabel::wordWrap

This property holds the label's word-wrapping policy. If this property is true then label text is wrapped where necessary at word-breaks, otherwise it is not wrapped at all.

By default, word wrap is disabled.

See also: text

Properties	Class Methods
read	wordWrap
write	setWordWrap

Public Signals

Public Slots

Public Methods

Protected Methods

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Method Documentation

Property Documentation