The QGraphicsBlurEffect class provides a blur effect. More...

Inheritance diagram for QGraphicsBlurEffect:

Public Typedefs
using	BlurHints = QFlags< BlurHint >

Public Typedefs inherited from QGraphicsEffect
using	ChangeFlags = QFlags< ChangeFlag >

Public Types
enum	BlurHint

Public Types inherited from QGraphicsEffect
enum	ChangeFlag

enum	PixmapPadMode

Public Signals
void	blurHintsChanged (BlurHints hints)

void	blurRadiusChanged (qreal blurRadius)

Public Signals inherited from QGraphicsEffect
void	enabledChanged (bool enabled)

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

void	objectNameChanged (const QString &objectName)

Public Slots
void	setBlurHints (BlurHints hints)

void	setBlurRadius (qreal blurRadius)

Public Slots inherited from QGraphicsEffect
void	setEnabled (bool enable)

void	update ()

Public Slots inherited from QObject
void	deleteLater ()

Public Methods
	QGraphicsBlurEffect (QObject *parent=nullptr)

	~QGraphicsBlurEffect ()

BlurHints	blurHints () const

qreal	blurRadius () const

QRectF	boundingRectFor (const QRectF &rect) const override

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

virtual	~QGraphicsEffect ()

QRectF	boundingRect () const

bool	isEnabled () 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

Protected Methods
void	draw (QPainter *painter) override

Protected Methods inherited from QGraphicsEffect
void	drawSource (QPainter *painter)

QRectF	sourceBoundingRect (Qt::CoordinateSystem system=Qt::LogicalCoordinates) const

virtual void	sourceChanged (ChangeFlags flags)

bool	sourceIsPixmap () const

QPixmap	sourcePixmap (Qt::CoordinateSystem system=Qt::LogicalCoordinates, QPoint *offset=nullptr, PixmapPadMode mode=PadToEffectiveBoundingRect) const

void	updateBoundingRect ()

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)

Properties
	blurHints

	blurRadius

Properties inherited from QGraphicsEffect
	enabled

Properties inherited from QObject
	objectName

Additional Inherited Members
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 >())

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

	QObjectList

Detailed Description

The QGraphicsBlurEffect class provides a blur effect.

A blur effect blurs the source. This effect is useful for reducing details, such as when the source loses focus and you want to draw attention to other elements. The level of detail can be modified using the setBlurRadius() function. Use setBlurHints() to choose the blur hints.

By default, the blur radius is 5 pixels. The blur radius is specified in device coordinates.

See also: QGraphicsDropShadowEffect, QGraphicsColorizeEffect, QGraphicsOpacityEffect

Member Typedef Documentation

QGraphicsBlurEffect::BlurHints

Typedef for QFlags<BlurHint> which contains an OR combination of BlurHint values.

Refer to QGraphicsBlurEffect::BlurHint for the enum documentation.

Member Enumeration Documentation

enum QGraphicsBlurEffect::BlurHint

This enum describes the possible hints that can be used to control how blur effects are applied. The hints might not have an effect in all the paint engines.

Constant	Value	Description
`QGraphicsBlurEffect::PerformanceHint`	`0x00`	Indicates that rendering performance is the most important factor, at the potential cost of lower quality.
`QGraphicsBlurEffect::QualityHint`	`0x01`	Indicates that rendering quality is the most important factor, at the potential cost of lower performance.
`QGraphicsBlurEffect::AnimationHint`	`0x02`	Indicates that the blur radius is going to be animated, hinting that the implementation can keep a cache of blurred versions of the source. Do not use this hint if the source is going to be dynamically changing.

See also: blurHints(), setBlurHints()

Constructor & Destructor Documentation

QGraphicsBlurEffect::QGraphicsBlurEffect ( QObject * parent = nullptr )

Constructs a new QGraphicsBlurEffect instance. The parent object is passed to the QGraphicsEffect constructor.

QGraphicsBlurEffect::~QGraphicsBlurEffect ( )

Destroys the effect.

Method Documentation

BlurHints QGraphicsBlurEffect::blurHints ( ) const

Returns the value of the property.

void QGraphicsBlurEffect::blurHintsChanged ( BlurHints hints )

signal

This signal is emitted whenever the effect's blur hints changes. The hints parameter holds the effect's new blur hints.

qreal QGraphicsBlurEffect::blurRadius ( ) const

Returns the value of the property.

void QGraphicsBlurEffect::blurRadiusChanged ( qreal blurRadius )

signal

This signal is emitted whenever the effect's blur radius changes. The blurRadius parameter holds the effect's new blur radius.

QRectF QGraphicsBlurEffect::boundingRectFor ( const QRectF & rect ) const

overridevirtual

Reimplemented from QGraphicsEffect::boundingRectFor()

void QGraphicsBlurEffect::draw ( QPainter * painter )

overrideprotectedvirtual

Implements QGraphicsEffect::draw()

void QGraphicsBlurEffect::setBlurHints ( BlurHints hints )

slot

Sets the value of the property to hints.

void QGraphicsBlurEffect::setBlurRadius ( qreal blurRadius )

slot

Sets the value of the property to blurRadius.

Property Documentation

QGraphicsBlurEffect::blurHints

This property holds the blur hint of the effect. Use the PerformanceHint hint to say that you want a faster blur, the QualityHint hint to say that you prefer a higher quality blur, or the AnimationHint when you want to animate the blur radius.

By default, the blur hint is PerformanceHint.

Properties	Class Methods
read	blurHints
write	setBlurHints
notify	blurHintsChanged

QGraphicsBlurEffect::blurRadius

This property holds the blur radius of the effect. Using a smaller radius results in a sharper appearance, whereas a bigger radius results in a more blurred appearance. The radius is given in device coordinates, meaning it is unaffected by scale.

By default, the blur radius is 5 pixels.

Properties	Class Methods
read	blurRadius
write	setBlurRadius
notify	blurRadiusChanged

Public Typedefs

Public Types

Public Signals

Public Slots

Public Methods

Protected Methods