The QGraphicsOpacityEffect class provides an opacity effect. More...

Inheritance diagram for QGraphicsOpacityEffect:

Public Signals
void	opacityChanged (qreal opacity)

void	opacityMaskChanged (const QBrush &mask)

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	setOpacity (qreal opacity)

void	setOpacityMask (const QBrush &mask)

Public Slots inherited from QGraphicsEffect
void	setEnabled (bool enable)

void	update ()

Public Slots inherited from QObject
void	deleteLater ()

Public Methods
	QGraphicsOpacityEffect (QObject *parent=nullptr)

	~QGraphicsOpacityEffect ()

qreal	opacity () const

QBrush	opacityMask () const

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

virtual	~QGraphicsEffect ()

QRectF	boundingRect () const

virtual QRectF	boundingRectFor (const QRectF &rectF) 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
	opacity

	opacityMask

Properties inherited from QGraphicsEffect
	enabled

Properties inherited from QObject
	objectName

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

Public Types inherited from QGraphicsEffect
enum	ChangeFlag

enum	PixmapPadMode

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 QGraphicsOpacityEffect class provides an opacity effect. An opacity effect renders the source with an opacity. This effect is useful for making the source semi-transparent, similar to a fade-in/fade-out sequence. The opacity can be modified using the setOpacity() method.

By default the opacity is 0.7.

See also: QGraphicsDropShadowEffect, QGraphicsBlurEffect, QGraphicsColorizeEffect

Constructor & Destructor Documentation

QGraphicsOpacityEffect::QGraphicsOpacityEffect ( QObject * parent = nullptr )

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

QGraphicsOpacityEffect::~QGraphicsOpacityEffect ( )

Destroys the effect.

Method Documentation

void QGraphicsOpacityEffect::draw ( QPainter * painter )

overrideprotectedvirtual

Implements QGraphicsEffect::draw()

qreal QGraphicsOpacityEffect::opacity ( ) const

Returns the value of the property.

void QGraphicsOpacityEffect::opacityChanged ( qreal opacity )

signal

This signal is emitted whenever the effect's opacity changes. The opacity holds the effect's new opacity.

QBrush QGraphicsOpacityEffect::opacityMask ( ) const

Returns the value of the property.

void QGraphicsOpacityEffect::opacityMaskChanged ( const QBrush & mask )

signal

This signal is emitted whenever the effect's opacity mask changes. The mask holds the effect's new opacity mask.

void QGraphicsOpacityEffect::setOpacity ( qreal opacity )

slot

Sets the value of the property to opacity.

void QGraphicsOpacityEffect::setOpacityMask ( const QBrush & mask )

slot

Sets the value of the property to mask.

Property Documentation

QGraphicsOpacityEffect::opacity

This property holds the opacity of the effect. The value should be in the range of 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque. By default, the opacity is 0.7.

See also: setOpacityMask()

Properties	Class Methods
read	opacity
write	setOpacity
notify	opacityChanged

QGraphicsOpacityEffect::opacityMask

This property holds the opacity mask of the effect. An opacity mask allows you apply opacity to portions of an element. There is no opacity mask by default.

QLinearGradient alphaGradient(rect.topLeft(), rect.bottomLeft());
alphaGradient.setColorAt(0.0, Qt::transparent);
alphaGradient.setColorAt(0.5, Qt::black);
alphaGradient.setColorAt(1.0, Qt::transparent);
 
QGraphicsOpacityEffect *effect = new QGraphicsOpacityEffect;
effect->setOpacityMask(alphaGradient);

See also: setOpacity()

Properties	Class Methods
read	opacityMask
write	setOpacityMask
notify	opacityMaskChanged

Public Signals

Public Slots

Public Methods

Protected Methods

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Method Documentation

Property Documentation