The QIdentityProxyModel class proxies its source model unmodified. More...

Inheritance diagram for QIdentityProxyModel:

Public Methods
	QIdentityProxyModel (QObject *parent=nullptr)

	~QIdentityProxyModel ()

int	columnCount (const QModelIndex &parent=QModelIndex ()) const override

bool	dropMimeData (const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override

QVariant	headerData (int section, Qt::Orientation orientation, int role=Qt::DisplayRole) const override

QModelIndex	index (int row, int column, const QModelIndex &parent=QModelIndex ()) const override

bool	insertColumns (int column, int count, const QModelIndex &parent=QModelIndex ()) override

bool	insertRows (int row, int count, const QModelIndex &parent=QModelIndex ()) override

QModelIndex	mapFromSource (const QModelIndex &sourceIndex) const override

QItemSelection	mapSelectionFromSource (const QItemSelection &selection) const override

QItemSelection	mapSelectionToSource (const QItemSelection &selection) const override

QModelIndex	mapToSource (const QModelIndex &proxyIndex) const override

QModelIndexList	match (const QModelIndex &start, int role, const QVariant &value, int hits=1, Qt::MatchFlags flags=Qt::MatchFlags (Qt::MatchStartsWith\|Qt::MatchWrap)) const override

QObject *	parent () const

QModelIndex	parent (const QModelIndex &child) const override

bool	removeColumns (int column, int count, const QModelIndex &parent=QModelIndex ()) override

bool	removeRows (int row, int count, const QModelIndex &parent=QModelIndex ()) override

int	rowCount (const QModelIndex &parent=QModelIndex ()) const override

void	setSourceModel (QAbstractItemModel *sourceModel) override

QModelIndex	sibling (int row, int column, const QModelIndex &idx) const override

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

	~QAbstractProxyModel () = default

QModelIndex	buddy (const QModelIndex &index) const override

bool	canDropMimeData (const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) const override

bool	canFetchMore (const QModelIndex &parent) const override

QVariant	data (const QModelIndex &proxyIndex, int role=Qt::DisplayRole) const override

void	fetchMore (const QModelIndex &parent) override

Qt::ItemFlags	flags (const QModelIndex &index) const override

bool	hasChildren (const QModelIndex &parent=QModelIndex ()) const override

QMap< int, QVariant >	itemData (const QModelIndex &proxyIndex) const override

QMimeData *	mimeData (const QModelIndexList &indexes) const override

QStringList	mimeTypes () const override

void	revert () override

bool	setData (const QModelIndex &index, const QVariant &value, int role=Qt::EditRole) override

bool	setHeaderData (int section, Qt::Orientation orientation, const QVariant &value, int role=Qt::EditRole) override

bool	setItemData (const QModelIndex &index, const QMap< int, QVariant > &roles) override

void	sort (int column, Qt::SortOrder order=Qt::AscendingOrder) override

QAbstractItemModel *	sourceModel () const

QSize	span (const QModelIndex &index) const override

bool	submit () override

Qt::DropActions	supportedDragActions () const override

Qt::DropActions	supportedDropActions () const override

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

virtual	~QAbstractItemModel ()

bool	hasIndex (int row, int column, const QModelIndex &parent=QModelIndex ()) const

bool	insertColumn (int column, const QModelIndex &parent=QModelIndex ())

bool	insertRow (int row, const QModelIndex &parent=QModelIndex ())

bool	moveColumn (const QModelIndex &sourceParent, int sourceColumn, const QModelIndex &destinationParent, int destinationChild)

virtual bool	moveColumns (const QModelIndex &sourceParent, int sourceColumn, int count, const QModelIndex &destinationParent, int destinationChild)

bool	moveRow (const QModelIndex &sourceParent, int sourceRow, const QModelIndex &destinationParent, int destinationChild)

virtual bool	moveRows (const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild)

QObject *	parent () const

bool	removeColumn (int column, const QModelIndex &parent=QModelIndex ())

bool	removeRow (int row, const QModelIndex &parent=QModelIndex ())

virtual QMultiHash< int, QString >	roleNames () 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

Additional Inherited Members
Public Signals inherited from QAbstractProxyModel
void	sourceModelChanged ()

Public Signals inherited from QAbstractItemModel
void	columnsAboutToBeInserted (const QModelIndex &parent, int first, int last)

void	columnsAboutToBeMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationColumn)

void	columnsAboutToBeRemoved (const QModelIndex &parent, int first, int last)

void	columnsInserted (const QModelIndex &parent, int first, int last)

void	columnsMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationColumn)

void	columnsRemoved (const QModelIndex &parent, int first, int last)

void	dataChanged (const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector< int > &roles=QVector< int >())

void	headerDataChanged (Qt::Orientation orientation, int first, int last)

void	layoutAboutToBeChanged (const QList< QPersistentModelIndex > &parents=QList< QPersistentModelIndex >(), QAbstractItemModel::LayoutChangeHint hint=QAbstractItemModel::NoLayoutChangeHint)

void	layoutChanged (const QList< QPersistentModelIndex > &parents=QList< QPersistentModelIndex >(), QAbstractItemModel::LayoutChangeHint hint=QAbstractItemModel::NoLayoutChangeHint)

void	modelAboutToBeReset ()

void	modelReset ()

void	rowsAboutToBeInserted (const QModelIndex &parent, int first, int last)

void	rowsAboutToBeMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationRow)

void	rowsAboutToBeRemoved (const QModelIndex &parent, int first, int last)

void	rowsInserted (const QModelIndex &parent, int first, int last)

void	rowsMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationRow)

void	rowsRemoved (const QModelIndex &parent, int first, int last)

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

void	objectNameChanged (const QString &objectName)

Public Slots inherited from QAbstractItemModel
virtual void	revert ()

virtual bool	submit ()

Public Slots inherited from QObject
void	deleteLater ()

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 QAbstractProxyModel
void	resetInternalData ()

Protected Slots inherited from QAbstractItemModel
void	resetInternalData ()

Protected Methods inherited from QAbstractItemModel
void	beginInsertColumns (const QModelIndex &parent, int first, int last)

void	beginInsertRows (const QModelIndex &parent, int first, int last)

bool	beginMoveColumns (const QModelIndex &sourceParent, int sourceFirst, int sourceLast, const QModelIndex &destinationParent, int destinationColumn)

bool	beginMoveRows (const QModelIndex &sourceParent, int sourceFirst, int sourceLast, const QModelIndex &destinationParent, int destinationRow)

void	beginRemoveColumns (const QModelIndex &parent, int first, int last)

void	beginRemoveRows (const QModelIndex &parent, int first, int last)

void	beginResetModel ()

void	changePersistentIndex (const QModelIndex &from, const QModelIndex &to)

void	changePersistentIndexList (const QModelIndexList &from, const QModelIndexList &to)

QModelIndex	createIndex (int row, int column, quintptr id) const

QModelIndex	createIndex (int row, int column, void *data=nullptr) const

void	endInsertColumns ()

void	endInsertRows ()

void	endMoveColumns ()

void	endMoveRows ()

void	endRemoveColumns ()

void	endRemoveRows ()

void	endResetModel ()

QModelIndexList	persistentIndexList () const

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 inherited from QAbstractProxyModel
	sourceModel

Properties inherited from QObject
	objectName

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

	QObjectList

Detailed Description

The QIdentityProxyModel class proxies its source model unmodified

QIdentityProxyModel can be used to forward the structure of a source model exactly, with no sorting, filtering or other transformation. This is similar in concept to an identity matrix where A.I = A.

Because it does no sorting or filtering, this class is most suitable to proxy models which transform the data() of the source model. For example, a proxy model could be created to define the font used, or the background color, or the tooltip etc. This removes the need to implement all data handling in the same class that creates the structure of the model, and can also be used to create re-usable components.

This also provides a way to change the data in the case where a source model is supplied by a third party which can not be modified.

class DateFormatProxyModel : public QIdentityProxyModel
{
  // ...
 
  void setDateFormatString(const QString &formatString)
  {
    m_formatString = formatString;
  }
 
  QVariant data(const QModelIndex &index, int role)
  {
    if (role != Qt::DisplayRole)
      return QIdentityProxyModel::data(index, role);
 
    const QDateTime dateTime = sourceModel()->data(SourceClass::DateRole).toDateTime();
 
    return dateTime.toString(m_formatString);
  }
 
private:
  QString m_formatString;
};

See also: QAbstractProxyModel, QAbstractItemModel, Model/View Architecture

Constructor & Destructor Documentation

QIdentityProxyModel::QIdentityProxyModel ( QObject * parent = nullptr )

explicit

Constructs an identity model with the given parent.

QIdentityProxyModel::~QIdentityProxyModel ( )

Destroys this identity model.

Method Documentation

int QIdentityProxyModel::columnCount ( const QModelIndex & parent = QModelIndex() ) const

overridevirtual

Implements QAbstractItemModel::columnCount()

bool QIdentityProxyModel::dropMimeData	(	const QMimeData *	data,
		Qt::DropAction	action,
		int	row,
		int	column,
		const QModelIndex &	parent
	)

overridevirtual

Reimplemented from QAbstractProxyModel::dropMimeData()

QVariant QIdentityProxyModel::headerData	(	int	section,
		Qt::Orientation	orientation,
		int	role = `Qt::DisplayRole`
	)		const

overridevirtual

Reimplemented from QAbstractProxyModel::headerData()

QModelIndex QIdentityProxyModel::index	(	int	row,
		int	column,
		const QModelIndex &	parent = `QModelIndex()`
	)		const

overridevirtual

Implements QAbstractItemModel::index()

bool QIdentityProxyModel::insertColumns	(	int	column,
		int	count,
		const QModelIndex &	parent = `QModelIndex()`
	)

overridevirtual

Reimplemented from QAbstractItemModel::insertColumns()

bool QIdentityProxyModel::insertRows	(	int	row,
		int	count,
		const QModelIndex &	parent = `QModelIndex()`
	)

overridevirtual

Reimplemented from QAbstractItemModel::insertRows()

QModelIndex QIdentityProxyModel::mapFromSource ( const QModelIndex & sourceIndex ) const

overridevirtual

Implements QAbstractProxyModel::mapFromSource()

QItemSelection QIdentityProxyModel::mapSelectionFromSource ( const QItemSelection & selection ) const

overridevirtual

Reimplemented from QAbstractProxyModel::mapSelectionFromSource()

QItemSelection QIdentityProxyModel::mapSelectionToSource ( const QItemSelection & selection ) const

overridevirtual

Reimplemented from QAbstractProxyModel::mapSelectionToSource()

QModelIndex QIdentityProxyModel::mapToSource ( const QModelIndex & proxyIndex ) const

overridevirtual

Implements QAbstractProxyModel::mapToSource()

QModelIndexList QIdentityProxyModel::match	(	const QModelIndex &	start,
		int	role,
		const QVariant &	value,
		int	hits = `1`,
		Qt::MatchFlags	flags = `Qt::MatchFlags(Qt::MatchStartsWith \| Qt::MatchWrap)`
	)		const

overridevirtual

Reimplemented from QAbstractItemModel::match()

QObject * QObject::parent ( ) const

using

Returns a pointer to the parent object.

See also: setParent(), children()

QModelIndex QIdentityProxyModel::parent ( const QModelIndex & child ) const

overridevirtual

Implements QAbstractItemModel::parent()

bool QIdentityProxyModel::removeColumns	(	int	column,
		int	count,
		const QModelIndex &	parent = `QModelIndex()`
	)

overridevirtual

Reimplemented from QAbstractItemModel::removeColumns()

bool QIdentityProxyModel::removeRows	(	int	row,
		int	count,
		const QModelIndex &	parent = `QModelIndex()`
	)

overridevirtual

Reimplemented from QAbstractItemModel::removeRows()

int QIdentityProxyModel::rowCount ( const QModelIndex & parent = QModelIndex() ) const

overridevirtual

Implements QAbstractItemModel::rowCount()

void QIdentityProxyModel::setSourceModel ( QAbstractItemModel * sourceModel )

overridevirtual

Reimplemented from QAbstractProxyModel::setSourceModel()

QModelIndex QIdentityProxyModel::sibling	(	int	row,
		int	column,
		const QModelIndex &	index
	)		const

overridevirtual

Returns the sibling at row and column for the item at index, or an invalid QModelIndex if there is no sibling at that location. The sibling() is just a convenience method that finds the item's parent, and uses it to retrieve the index of the child item in the specified row and column.

See also: index(), QModelIndex::row(), QModelIndex::column()

Reimplemented from QAbstractProxyModel::sibling()

Public Methods

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Method Documentation