The QGraphicsSceneLinearIndex class provides an implementation of a linear indexing algorithm for discovering items in QGraphicsScene. More...

#include <qgraphicsscenelinearindex_p.h>

Inheritance diagram for QGraphicsSceneLinearIndex:

Public Functions
virtual QList< QGraphicsItem * >	estimateItems (const QRectF &rect, Qt::SortOrder order) const
	Returns an estimation visible items that are either inside or intersect with the specified rect and return a list sorted using order. More...

QList< QGraphicsItem * >	items (Qt::SortOrder order=Qt::DescendingOrder) const
	Return all items in the index and sort them using order. More...

	QGraphicsSceneLinearIndex (QGraphicsScene *scene=0)
	Construct a linear index for the given scene. More...

Public Functions inherited from QGraphicsSceneIndex
virtual QList< QGraphicsItem * >	estimateItems (const QPointF &point, Qt::SortOrder order) const
	This virtual function return an estimation of items at position point. More...

virtual QList< QGraphicsItem * >	estimateTopLevelItems (const QRectF &, Qt::SortOrder order) const

virtual QList< QGraphicsItem * >	items (const QPointF &pos, Qt::ItemSelectionMode mode, Qt::SortOrder order, const QTransform &deviceTransform=QTransform()) const
	Returns all visible items that, depending on mode, are at the specified pos and return a list sorted using order. More...

virtual QList< QGraphicsItem * >	items (const QRectF &rect, 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.Returns all visible items that, depending on mode, are either inside or intersect with the specified rect and return a list sorted using order. More...

virtual QList< QGraphicsItem * >	items (const QPolygonF &polygon, Qt::ItemSelectionMode mode, Qt::SortOrder order, const QTransform &deviceTransform=QTransform()) const

virtual QList< QGraphicsItem * >	items (const QPainterPath &path, 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.Returns all visible items that, depending on mode, are either inside or intersect with the specified path and return a list sorted using order. More...

	QGraphicsSceneIndex (QGraphicsScene *scene=0)
	Constructs an abstract scene index for a given scene. More...

QGraphicsScene *	scene () const
	Returns the scene of this index. More...

virtual	~QGraphicsSceneIndex ()
	Destroys the scene index. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) 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. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

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. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Protected Functions
virtual void	addItem (QGraphicsItem *item)
	Add the item into the index. More...

virtual void	clear ()
	Clear the all the BSP index. More...

virtual void	removeItem (QGraphicsItem *item)
	Add the item from the index. More...

Protected Functions inherited from QGraphicsSceneIndex
virtual void	deleteItem (QGraphicsItem *item)
	This method is called when an item has been deleted. More...

virtual void	itemChange (const QGraphicsItem item, QGraphicsItem::GraphicsItemChange, const void const value)
	This virtual function is called by QGraphicsItem to notify the index that some part of the item 's state changes. More...

virtual void	prepareBoundingRectChange (const QGraphicsItem *item)
	Notify the index for a geometry change of an item. More...

	QGraphicsSceneIndex (QGraphicsSceneIndexPrivate &dd, QGraphicsScene *scene)

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

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 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Properties
QList< QGraphicsItem * >	m_items

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Slots inherited from QGraphicsSceneIndex
virtual void	updateSceneRect (const QRectF &rect)
	Notifies the index that the scene's scene rect has changed. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

The QGraphicsSceneLinearIndex class provides an implementation of a linear indexing algorithm for discovering items in QGraphicsScene.

Since: 4.6

Warning: This function is not part of the public interface.

QGraphicsSceneLinearIndex index is default linear implementation to discover items. It basically store all items in a list and return them to the scene.

See also: QGraphicsScene, QGraphicsView, QGraphicsSceneIndex, QGraphicsSceneBspTreeIndex

Definition at line 71 of file qgraphicsscenelinearindex_p.h.

Constructors and Destructors

◆ QGraphicsSceneLinearIndex()

QGraphicsSceneLinearIndex::QGraphicsSceneLinearIndex ( QGraphicsScene * scene = 0 )

inline

Construct a linear index for the given scene.

Definition at line 76 of file qgraphicsscenelinearindex_p.h.

76 : QGraphicsSceneIndex(scene)

77 { }

QGraphicsSceneIndex::QGraphicsSceneIndex

QGraphicsSceneIndex(QGraphicsScene *scene=0)

Constructs an abstract scene index for a given scene.

Definition: qgraphicssceneindex.cpp:373

Functions

◆ addItem()

void QGraphicsSceneLinearIndex::addItem ( QGraphicsItem * item )

inlineprotectedvirtual

Add the item into the index.

Implements QGraphicsSceneIndex.

Definition at line 93 of file qgraphicsscenelinearindex_p.h.

94 { m_items << item; }

QGraphicsSceneLinearIndex::m_items

QList< QGraphicsItem * > m_items

Definition: qgraphicsscenelinearindex_p.h:100

◆ clear()

void QGraphicsSceneLinearIndex::clear ( )

inlineprotectedvirtual

Clear the all the BSP index.

Warning: This function is not part of the public interface.

Reimplemented from QGraphicsSceneIndex.

Definition at line 90 of file qgraphicsscenelinearindex_p.h.

91 { m_items.clear(); }

QList::clear

void clear()

Removes all items from the list.

Definition: qlist.h:764

QGraphicsSceneLinearIndex::m_items

QList< QGraphicsItem * > m_items

Definition: qgraphicsscenelinearindex_p.h:100

◆ estimateItems()

QList< QGraphicsItem * > QGraphicsSceneLinearIndex::estimateItems	(	const QRectF &	rect,
		Qt::SortOrder	order
	)		const

inlinevirtual

Returns an estimation visible items that are either inside or intersect with the specified rect and return a list sorted using order.

Implements QGraphicsSceneIndex.

Definition at line 82 of file qgraphicsscenelinearindex_p.h.

     {
         Q_UNUSED(rect);
         Q_UNUSED(order);
         return m_items;
     }

◆ items()

QList< QGraphicsItem * > QGraphicsSceneLinearIndex::items ( Qt::SortOrder order = Qt::DescendingOrder ) const

inlinevirtual

Return all items in the index and sort them using order.

Implements QGraphicsSceneIndex.

Definition at line 79 of file qgraphicsscenelinearindex_p.h.

80 { Q_UNUSED(order); return m_items; }

QGraphicsSceneLinearIndex::m_items

QList< QGraphicsItem * > m_items

Definition: qgraphicsscenelinearindex_p.h:100

Q_UNUSED

#define Q_UNUSED(x)

Indicates to the compiler that the parameter with the specified name is not used in the body of a fun...

Definition: qglobal.h:1729

◆ removeItem()

void QGraphicsSceneLinearIndex::removeItem ( QGraphicsItem * item )

inlineprotectedvirtual

Add the item from the index.

Implements QGraphicsSceneIndex.

Definition at line 96 of file qgraphicsscenelinearindex_p.h.

97 { m_items.removeOne(item); }

QList::removeOne

bool removeOne(const T &t)

Removes the first occurrence of value in the list and returns true on success; otherwise returns fals...

Definition: qlist.h:796

QGraphicsSceneLinearIndex::m_items

QList< QGraphicsItem * > m_items

Definition: qgraphicsscenelinearindex_p.h:100

Properties

◆ m_items

QList<QGraphicsItem*> QGraphicsSceneLinearIndex::m_items

private

Definition at line 100 of file qgraphicsscenelinearindex_p.h.

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

/src/gui/graphicsview/qgraphicsscenelinearindex_p.h
/src/gui/graphicsview/qgraphicsscenelinearindex.cpp

Public Functions

Protected Functions

Properties

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ QGraphicsSceneLinearIndex()

Functions

◆ addItem()

◆ clear()

◆ estimateItems()

◆ items()

◆ removeItem()

Properties

◆ m_items