Inheritance diagram for CustomScene:

Collaboration diagram for CustomScene:

Public Member Functions
	CustomScene ()
void	drawItems (QPainter painter, int numItems, QGraphicsItem items[], const QStyleOptionGraphicsItem options[], QWidget *widget=nullptr) override
	[0]
	CustomScene ()
void	drawItems (QPainter painter, int numItems, QGraphicsItem items[], const QStyleOptionGraphicsItem options[], QWidget *widget=nullptr) override
Public Member Functions inherited from QGraphicsScene
	QGraphicsScene (QObject *parent=nullptr)
	Constructs a QGraphicsScene object.
	QGraphicsScene (const QRectF &sceneRect, QObject *parent=nullptr)
	Constructs a QGraphicsScene object, using sceneRect for its scene rectangle.
	QGraphicsScene (qreal x, qreal y, qreal width, qreal height, QObject *parent=nullptr)
	Constructs a QGraphicsScene object, using the rectangle specified by (x, y), and the given width and height for its scene rectangle.
virtual	~QGraphicsScene ()
	Removes and deletes all items from the scene object before destroying the scene object.
QRectF	sceneRect () const
qreal	width () const
	This convenience function is equivalent to calling sceneRect().width().
qreal	height () const
	This convenience function is equivalent to calling `sceneRect()`.height().
void	setSceneRect (const QRectF &rect)
void	setSceneRect (qreal x, qreal y, qreal w, qreal h)
void	render (QPainter *painter, const QRectF &target=QRectF(), const QRectF &source=QRectF(), Qt::AspectRatioMode aspectRatioMode=Qt::KeepAspectRatio)
	Renders the source rect from scene into target, using painter.
ItemIndexMethod	itemIndexMethod () const
void	setItemIndexMethod (ItemIndexMethod method)
int	bspTreeDepth () const
void	setBspTreeDepth (int depth)
QRectF	itemsBoundingRect () const
	Calculates and returns the bounding rect of all items on the scene.
QList< QGraphicsItem * >	items (Qt::SortOrder order=Qt::DescendingOrder) const
	Returns an ordered list of all items on the scene.
QList< QGraphicsItem * >	items (const QPointF &pos, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape, Qt::SortOrder order=Qt::DescendingOrder, const QTransform &deviceTransform=QTransform()) const
	Returns all visible items that, depending on mode, are at the specified pos in a list sorted using order. In this case, "visible" defines items for which: isVisible() returns `true`, effectiveOpacity() returns a value greater than 0.0 (which is fully transparent) and the parent item does not clip it.
QList< QGraphicsItem * >	items (const QRectF &rect, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape, Qt::SortOrder order=Qt::DescendingOrder, const QTransform &deviceTransform=QTransform()) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QList< QGraphicsItem * >	items (const QPolygonF &polygon, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape, Qt::SortOrder order=Qt::DescendingOrder, const QTransform &deviceTransform=QTransform()) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QList< QGraphicsItem * >	items (const QPainterPath &path, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape, Qt::SortOrder order=Qt::DescendingOrder, const QTransform &deviceTransform=QTransform()) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QList< QGraphicsItem * >	items (qreal x, qreal y, qreal w, qreal h, Qt::ItemSelectionMode mode, Qt::SortOrder order, const QTransform &deviceTransform=QTransform()) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QList< QGraphicsItem * >	collidingItems (const QGraphicsItem *item, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape) const
	Returns a list of all items that collide with item.
QGraphicsItem *	itemAt (const QPointF &pos, const QTransform &deviceTransform) const
QGraphicsItem *	itemAt (qreal x, qreal y, const QTransform &deviceTransform) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QList< QGraphicsItem * >	selectedItems () const
	Returns a list of all currently selected items.
QPainterPath	selectionArea () const
	Returns the selection area that was previously set with setSelectionArea(), or an empty QPainterPath if no selection area has been set.
void	setSelectionArea (const QPainterPath &path, const QTransform &deviceTransform)
void	setSelectionArea (const QPainterPath &path, Qt::ItemSelectionOperation selectionOperation=Qt::ReplaceSelection, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape, const QTransform &deviceTransform=QTransform())
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QGraphicsItemGroup *	createItemGroup (const QList< QGraphicsItem * > &items)
	Groups all items in items into a new QGraphicsItemGroup, and returns a pointer to the group.
void	destroyItemGroup (QGraphicsItemGroup *group)
	Reparents all items in group to group's parent item, then removes group from the scene, and finally deletes it.
void	addItem (QGraphicsItem *item)
	Adds or moves the item and all its children to this scene.
QGraphicsEllipseItem *	addEllipse (const QRectF &rect, const QPen &pen=QPen(), const QBrush &brush=QBrush())
	Creates and adds an ellipse item to the scene, and returns the item pointer.
QGraphicsLineItem *	addLine (const QLineF &line, const QPen &pen=QPen())
	Creates and adds a line item to the scene, and returns the item pointer.
QGraphicsPathItem *	addPath (const QPainterPath &path, const QPen &pen=QPen(), const QBrush &brush=QBrush())
	Creates and adds a path item to the scene, and returns the item pointer.
QGraphicsPixmapItem *	addPixmap (const QPixmap &pixmap)
	Creates and adds a pixmap item to the scene, and returns the item pointer.
QGraphicsPolygonItem *	addPolygon (const QPolygonF &polygon, const QPen &pen=QPen(), const QBrush &brush=QBrush())
	Creates and adds a polygon item to the scene, and returns the item pointer.
QGraphicsRectItem *	addRect (const QRectF &rect, const QPen &pen=QPen(), const QBrush &brush=QBrush())
	Creates and adds a rectangle item to the scene, and returns the item pointer.
QGraphicsTextItem *	addText (const QString &text, const QFont &font=QFont())
	Creates and adds a text item to the scene, and returns the item pointer.
QGraphicsSimpleTextItem *	addSimpleText (const QString &text, const QFont &font=QFont())
	Creates and adds a QGraphicsSimpleTextItem to the scene, and returns the item pointer.
QGraphicsProxyWidget *	addWidget (QWidget *widget, Qt::WindowFlags wFlags=Qt::WindowFlags())
	Creates a new QGraphicsProxyWidget for widget, adds it to the scene, and returns a pointer to the proxy.
QGraphicsEllipseItem *	addEllipse (qreal x, qreal y, qreal w, qreal h, const QPen &pen=QPen(), const QBrush &brush=QBrush())
QGraphicsLineItem *	addLine (qreal x1, qreal y1, qreal x2, qreal y2, const QPen &pen=QPen())
QGraphicsRectItem *	addRect (qreal x, qreal y, qreal w, qreal h, const QPen &pen=QPen(), const QBrush &brush=QBrush())
void	removeItem (QGraphicsItem *item)
	Removes the item item and all its children from the scene.
QGraphicsItem *	focusItem () const
	When the scene is active, this functions returns the scene's current focus item, or \nullptr if no item currently has focus.
void	setFocusItem (QGraphicsItem *item, Qt::FocusReason focusReason=Qt::OtherFocusReason)
	Sets the scene's focus item to item, with the focus reason focusReason, after removing focus from any previous item that may have had focus.
bool	hasFocus () const
	Returns `true` if the scene has focus; otherwise returns `false`.
void	setFocus (Qt::FocusReason focusReason=Qt::OtherFocusReason)
	Sets focus on the scene by sending a QFocusEvent to the scene, passing focusReason as the reason.
void	clearFocus ()
	Clears focus from the scene.
void	setStickyFocus (bool enabled)
bool	stickyFocus () const
QGraphicsItem *	mouseGrabberItem () const
	Returns the current mouse grabber item, or \nullptr if no item is currently grabbing the mouse.
QBrush	backgroundBrush () const
void	setBackgroundBrush (const QBrush &brush)
QBrush	foregroundBrush () const
void	setForegroundBrush (const QBrush &brush)
virtual QVariant	inputMethodQuery (Qt::InputMethodQuery query) const
	This method is used by input methods to query a set of properties of the scene to be able to support complex input method operations as support for surrounding text and reconversions.
QList< QGraphicsView * >	views () const
	Returns a list of all the views that display this scene.
void	update (qreal x, qreal y, qreal w, qreal h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
void	invalidate (qreal x, qreal y, qreal w, qreal h, SceneLayers layers=AllLayers)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QStyle *	style () const
void	setStyle (QStyle *style)
QFont	font () const
void	setFont (const QFont &font)
QPalette	palette () const
void	setPalette (const QPalette &palette)
bool	isActive () const
QGraphicsItem *	activePanel () const
void	setActivePanel (QGraphicsItem *item)
QGraphicsWidget *	activeWindow () const
void	setActiveWindow (QGraphicsWidget *widget)
bool	sendEvent (QGraphicsItem item, QEvent event)
qreal	minimumRenderSize () const
void	setMinimumRenderSize (qreal minSize)
bool	focusOnTouch () const
void	setFocusOnTouch (bool enabled)
Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.
virtual	~QObject ()
	Destroys the object, deleting all its child objects.
QString	objectName () const
Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.
void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QBindable< QString >	bindableObjectName ()
bool	isWidgetType () const
	Returns `true` if the object is a widget; otherwise returns `false`.
bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.
bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.
bool	isQmlObjectType () const
	Returns whether the object has been created by the QML engine or ownership has been explicitly set via QJSEngine::setObjectOwnership().
bool	signalsBlocked () const noexcept
	Returns `true` if signals are blocked; otherwise returns `false`.
bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
QThread *	thread () const
	Returns the thread in which the object lives.
bool	moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
	Changes the thread affinity for this object and its children and returns `true` on success.
int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
int	startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
void	killTimer (int id)
	Kills the timer with timer identifier, id.
void	killTimer (Qt::TimerId id)
template<typename T>
T	findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
template<typename T>
QList< T >	findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.
template<typename T>
T	findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
template<typename T>
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
const QObjectList &	children () const
	Returns a list of child objects.
void	setParent (QObject *parent)
	Makes the object a child of parent.
void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.
void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.
QMetaObject::Connection	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char signal=nullptr, const QObject receiver=nullptr, const char *member=nullptr) const
bool	disconnect (const QObject receiver, const char member=nullptr) const
void	dumpObjectTree () const
	Dumps a tree of children to the debug output.
void	dumpObjectInfo () const
	Dumps information about signal connections, etc.
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.
bool	setProperty (const char *name, QVariant &&value)
QVariant	property (const char *name) const
	Returns the value of the object's name property.
QList< QByteArray >	dynamicPropertyNames () const
QBindingStorage *	bindingStorage ()
const QBindingStorage *	bindingStorage () const
QObject *	parent () const
	Returns a pointer to the parent object.
bool	inherits (const char *classname) const
	Returns `true` if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns `false`.

Additional Inherited Members
Public Types inherited from QGraphicsScene
enum	ItemIndexMethod { BspTreeIndex , NoIndex = -1 }
	This enum describes the indexing algorithms QGraphicsScene provides for managing positional information about items on the scene. More...
enum	SceneLayer { ItemLayer = 0x1 , BackgroundLayer = 0x2 , ForegroundLayer = 0x4 , AllLayers = 0xffff }
Public Slots inherited from QGraphicsScene
void	update (const QRectF &rect=QRectF())
	Schedules a redraw of the area rect on the scene.
void	invalidate (const QRectF &rect=QRectF(), SceneLayers layers=AllLayers)
	Invalidates and schedules a redraw of the layers in rect on the scene.
void	advance ()
	This slot advances the scene by one step, by calling QGraphicsItem::advance() for all items on the scene.
void	clearSelection ()
	Clears the current selection.
void	clear ()
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe
Signals inherited from QGraphicsScene
void	changed (const QList< QRectF > &region)
	This signal is emitted by QGraphicsScene when control reaches the event loop, if the scene content changes.
void	sceneRectChanged (const QRectF &rect)
	This signal is emitted by QGraphicsScene whenever the scene rect changes.
void	selectionChanged ()
void	focusItemChanged (QGraphicsItem newFocus, QGraphicsItem oldFocus, Qt::FocusReason reason)
	This signal is emitted by QGraphicsScene whenever focus changes in the scene (i.e., when an item gains or loses input focus, or when focus passes from one item to another).
Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.
Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe
static QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1, typename Func2>
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1, typename Func2>
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe
static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)
static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.
template<typename Func1, typename Func2>
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)
template<typename Func1>
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)
Protected Slots inherited from QGraphicsScene
virtual bool	focusNextPrevChild (bool next)
Protected Member Functions inherited from QGraphicsScene
bool	event (QEvent *event) override
	Processes the event event, and dispatches it to the respective event handlers.
bool	eventFilter (QObject watched, QEvent event) override
	\reimp
virtual void	contextMenuEvent (QGraphicsSceneContextMenuEvent *event)
	This event handler, for event contextMenuEvent, can be reimplemented in a subclass to receive context menu events.
virtual void	dragEnterEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive drag enter events for the scene.
virtual void	dragMoveEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive drag move events for the scene.
virtual void	dragLeaveEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive drag leave events for the scene.
virtual void	dropEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive drop events for the scene.
virtual void	focusInEvent (QFocusEvent *event)
	This event handler, for event focusEvent, can be reimplemented in a subclass to receive focus in events.
virtual void	focusOutEvent (QFocusEvent *event)
	This event handler, for event focusEvent, can be reimplemented in a subclass to receive focus out events.
virtual void	helpEvent (QGraphicsSceneHelpEvent *event)
	This event handler, for event helpEvent, can be reimplemented in a subclass to receive help events.
virtual void	keyPressEvent (QKeyEvent *event)
	This event handler, for event keyEvent, can be reimplemented in a subclass to receive keypress events.
virtual void	keyReleaseEvent (QKeyEvent *event)
	This event handler, for event keyEvent, can be reimplemented in a subclass to receive key release events.
virtual void	mousePressEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event mouseEvent, can be reimplemented in a subclass to receive mouse press events for the scene.
virtual void	mouseMoveEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event mouseEvent, can be reimplemented in a subclass to receive mouse move events for the scene.
virtual void	mouseReleaseEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event mouseEvent, can be reimplemented in a subclass to receive mouse release events for the scene.
virtual void	mouseDoubleClickEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event mouseEvent, can be reimplemented in a subclass to receive mouse double-click events for the scene.
virtual void	wheelEvent (QGraphicsSceneWheelEvent *event)
	This event handler, for event wheelEvent, can be reimplemented in a subclass to receive mouse wheel events for the scene.
virtual void	inputMethodEvent (QInputMethodEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive input method events for the scene.
virtual void	drawBackground (QPainter *painter, const QRectF &rect)
	Draws the background of the scene using painter, before any items and the foreground are drawn.
virtual void	drawForeground (QPainter *painter, const QRectF &rect)
	Draws the foreground of the scene using painter, after the background and all items have been drawn.
Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.
int	senderSignalIndex () const
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.
bool	isSignalConnected (const QMetaMethod &signal) const
virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.
virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.
virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	disconnectNotify (const QMetaMethod &signal)
	QObject (QObjectPrivate &dd, QObject *parent=nullptr)
Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Properties inherited from QGraphicsScene
QBrush	backgroundBrush
	the background brush of the scene.
QBrush	foregroundBrush
	the foreground brush of the scene.
ItemIndexMethod	itemIndexMethod
	the item indexing method.
QRectF	sceneRect
	the scene rectangle; the bounding rectangle of the scene
int	bspTreeDepth
	the depth of QGraphicsScene's BSP index tree
QPalette	palette
	the scene's default palette
QFont	font
	the scene's default font
bool	stickyFocus
	whether clicking into the scene background will clear focus
qreal	minimumRenderSize
	the minimal view-transformed size an item must have to be drawn
bool	focusOnTouch
	whether items gain focus when receiving a {touch begin} event.
Properties inherited from QObject
QString	objectName
	the name of this object
Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.
template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

Definition at line 9 of file graphicssceneadditemsnippet.cpp.

Constructor & Destructor Documentation

◆ CustomScene() [1/2]

CustomScene::CustomScene ( )

inline

Definition at line 12 of file graphicssceneadditemsnippet.cpp.

◆ CustomScene() [2/2]

CustomScene::CustomScene ( )

inline

Definition at line 12 of file graphicssceneadditemsnippet.cpp.

Member Function Documentation

◆ drawItems() [1/2]

void CustomScene::drawItems	(	QPainter *	painter,
		int	numItems,
		QGraphicsItem *	items[],
		const QStyleOptionGraphicsItem	options[],
		QWidget *	widget = nullptr )

overridevirtual

[0]

Reimplemented from QGraphicsScene.

Definition at line 21 of file graphicssceneadditemsnippet.cpp.

◆ drawItems() [2/2]

void CustomScene::drawItems	(	QPainter *	painter,
		int	numItems,
		QGraphicsItem *	items[],
		const QStyleOptionGraphicsItem	options[],
		QWidget *	widget = nullptr )

overridevirtual

Deprecated

Paints the given items using the provided painter, after the background has been drawn, and before the foreground has been drawn. All painting is done in scene coordinates. Before drawing each item, the painter must be transformed using QGraphicsItem::sceneTransform().

The options parameter is the list of style option objects for each item in items. The numItems parameter is the number of items in items and options in options. The widget parameter is optional; if specified, it should point to the widget that is being painted on.

The default implementation prepares the painter matrix, and calls QGraphicsItem::paint() on all items. Reimplement this function to provide custom painting of all items for the scene; gaining complete control over how each item is drawn. In some cases this can increase drawing performance significantly.

Example:

void CustomScene::drawItems(QPainter *painter, int numItems,
                            QGraphicsItem *items[],
                            const QStyleOptionGraphicsItem options[],
                            QWidget *widget)
{
    for (int i = 0; i < numItems; ++i) {
         // Draw the item
         painter->save();
         painter->setTransform(items[i]->sceneTransform(), true);
         items[i]->paint(painter, &options[i], widget);
         painter->restore();
     }
}

Since Qt 4.6, this function is not called anymore unless the QGraphicsView::IndirectPainting flag is given as an Optimization flag.

See also: drawBackground(), drawForeground()

Deprecated