Contents

• Public Functions
• Reimplemented Public Functions
• Detailed Description

Detailed Description

TheQIdentityProxyModel 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 thedata() 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 :publicQIdentityProxyModel{// ...void setDateFormatString(constQString&formatString)  {    m_formatString= formatString;  }QVariant data(constQModelIndex&index,int role)  {if (role!=Qt::DisplayRole)returnQIdentityProxyModel::data(index, role);constQDateTime dateTime= sourceModel()->data(SourceClass::DateRole).toDateTime();return dateTime.toString(m_formatString);  }private:QString m_formatString;};

Member Function Documentation

QIdentityProxyModel::QIdentityProxyModel(QObject * parent = 0)

Constructs an identity model with the givenparent.

QIdentityProxyModel::~QIdentityProxyModel()

Destroys this identity model.

[virtual]int QIdentityProxyModel::columnCount(constQModelIndex & parent = QModelIndex()) const

Reimplemented fromQAbstractItemModel::columnCount().

[virtual]bool QIdentityProxyModel::dropMimeData(constQMimeData * data,Qt::DropAction action,int row,int column, constQModelIndex & parent)

Reimplemented fromQAbstractItemModel::dropMimeData().

[virtual]QModelIndex QIdentityProxyModel::index(int row,int column, constQModelIndex & parent = QModelIndex()) const

Reimplemented fromQAbstractItemModel::index().

[virtual]bool QIdentityProxyModel::insertColumns(int column,int count, constQModelIndex & parent = QModelIndex())

Reimplemented fromQAbstractItemModel::insertColumns().

[virtual]bool QIdentityProxyModel::insertRows(int row,int count, constQModelIndex & parent = QModelIndex())

Reimplemented fromQAbstractItemModel::insertRows().

[virtual]QModelIndex QIdentityProxyModel::mapFromSource(constQModelIndex & sourceIndex) const

Reimplemented fromQAbstractProxyModel::mapFromSource().

[virtual]QItemSelection QIdentityProxyModel::mapSelectionFromSource(constQItemSelection & selection) const

Reimplemented fromQAbstractProxyModel::mapSelectionFromSource().

[virtual]QItemSelection QIdentityProxyModel::mapSelectionToSource(constQItemSelection & selection) const

Reimplemented fromQAbstractProxyModel::mapSelectionToSource().

[virtual]QModelIndex QIdentityProxyModel::mapToSource(constQModelIndex & proxyIndex) const

Reimplemented fromQAbstractProxyModel::mapToSource().

[virtual]QModelIndexList QIdentityProxyModel::match(constQModelIndex & start,int role, constQVariant & value,int hits = 1,Qt::MatchFlags flags = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap )) const

Reimplemented fromQAbstractItemModel::match().

[virtual]QModelIndex QIdentityProxyModel::parent(constQModelIndex & child) const

Reimplemented fromQAbstractItemModel::parent().

[virtual]bool QIdentityProxyModel::removeColumns(int column,int count, constQModelIndex & parent = QModelIndex())

Reimplemented fromQAbstractItemModel::removeColumns().

[virtual]bool QIdentityProxyModel::removeRows(int row,int count, constQModelIndex & parent = QModelIndex())

Reimplemented fromQAbstractItemModel::removeRows().

[virtual]int QIdentityProxyModel::rowCount(constQModelIndex & parent = QModelIndex()) const

Reimplemented fromQAbstractItemModel::rowCount().

[virtual]void QIdentityProxyModel::setSourceModel(QAbstractItemModel * newSourceModel)

Reimplemented fromQAbstractProxyModel::setSourceModel().