QIdentityProxyModel Class Reference
The QIdentityProxyModel class proxies its source model unmodified More...
#include <QIdentityProxyModel> Inherits: QAbstractProxyModel .
This class was introduced in Qt 4.8.
Public Functions
Reimplemented Public Functions
virtual int columnCount parent = QModelIndex() ) const virtual bool dropMimeData data , Qt::DropAction action , int row , int column , const QModelIndex & parent ) virtual QModelIndex index row , int column , const QModelIndex & parent = QModelIndex() ) const virtual bool insertColumns column , int count , const QModelIndex & parent = QModelIndex() ) virtual bool insertRows row , int count , const QModelIndex & parent = QModelIndex() ) virtual QModelIndex mapFromSource sourceIndex ) const virtual QItemSelection mapSelectionFromSource selection ) const virtual QItemSelection mapSelectionToSource selection ) const virtual QModelIndex mapToSource proxyIndex ) const virtual QModelIndexList match start , int role , const QVariant & value , int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap ) ) const virtual QModelIndex parent child ) const virtual bool removeColumns column , int count , const QModelIndex & parent = QModelIndex() ) virtual bool removeRows row , int count , const QModelIndex & parent = QModelIndex() ) virtual int rowCount parent = QModelIndex() ) const virtual void setSourceModel sourceModel )
Additional Inherited Members
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 colour, 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 const QModelIndex & index, int role)
{
if (role ! = Qt :: DisplayRole)
return QIdentityProxyModel :: data(index, role);
const QDateTime = sourceModel()- > data(SourceClass:: DateRole). toDateTime();
return dateTime. toString(m_formatString);
}
private :
QString
See also QAbstractProxyModel , Model/View Programming , and QAbstractItemModel .
Member Function Documentation
QIdentityProxyModel ( QObject parent = 0 )Constructs an identity model with the given parent .
~QIdentityProxyModel ()Destroys this identity model.
int QIdentityProxyModel::columnCount ( const QModelIndex parent = QModelIndex() ) const [virtual] Reimplemented from QAbstractItemModel::columnCount ().
bool QIdentityProxyModel::dropMimeData ( const QMimeData data , Qt::DropAction action , int row , int column , const QModelIndex parent ) [virtual] Reimplemented from QAbstractItemModel::dropMimeData ().
QModelIndex index ( int row , int column , const QModelIndex parent = QModelIndex() ) const [virtual] Reimplemented from QAbstractItemModel::index ().
bool QIdentityProxyModel::insertColumns ( int column , int count , const QModelIndex parent = QModelIndex() ) [virtual] Reimplemented from QAbstractItemModel::insertColumns ().
bool QIdentityProxyModel::insertRows ( int row , int count , const QModelIndex parent = QModelIndex() ) [virtual] Reimplemented from QAbstractItemModel::insertRows ().
QModelIndex mapFromSource ( const QModelIndex sourceIndex ) const [virtual] Reimplemented from QAbstractProxyModel::mapFromSource ().
QItemSelection mapSelectionFromSource ( const QItemSelection selection ) const [virtual] Reimplemented from QAbstractProxyModel::mapSelectionFromSource ().
QItemSelection mapSelectionToSource ( const QItemSelection selection ) const [virtual] Reimplemented from QAbstractProxyModel::mapSelectionToSource ().
QModelIndex mapToSource ( const QModelIndex proxyIndex ) const [virtual] Reimplemented from QAbstractProxyModel::mapToSource ().
QModelIndexList match ( const QModelIndex start , int role , const QVariant value , int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap ) ) const [virtual] Reimplemented from QAbstractItemModel::match ().
QModelIndex parent ( const QModelIndex child ) const [virtual] Reimplemented from QAbstractItemModel::parent ().
bool QIdentityProxyModel::removeColumns ( int column , int count , const QModelIndex parent = QModelIndex() ) [virtual] Reimplemented from QAbstractItemModel::removeColumns ().
bool QIdentityProxyModel::removeRows ( int row , int count , const QModelIndex parent = QModelIndex() ) [virtual] Reimplemented from QAbstractItemModel::removeRows ().
int QIdentityProxyModel::rowCount ( const QModelIndex parent = QModelIndex() ) const [virtual] Reimplemented from QAbstractItemModel::rowCount ().
void QIdentityProxyModel::setSourceModel ( QAbstractItemModel sourceModel ) [virtual] Reimplemented from QAbstractProxyModel::setSourceModel ().
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