QIdentityProxyModel Class ReferenceThe QIdentityProxyModel class proxies its source model unmodified More... #include <QIdentityProxyModel> Inherits: QAbstractProxyModel. This class was introduced in Qt 4.8. Открытые функции
Переопределённые открытые функции
Дополнительные унаследованные члены
Подробное описаниеThe 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 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, Model/View Programming, and QAbstractItemModel. Описание функций-членовQIdentityProxyModel::QIdentityProxyModel ( QObject * parent = 0 )Constructs an identity model with the given parent. QIdentityProxyModel::~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 QIdentityProxyModel::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]Переопределено из QAbstractItemModel::insertRows(). QModelIndex QIdentityProxyModel::mapFromSource ( const QModelIndex & sourceIndex ) const [virtual]Reimplemented from QAbstractProxyModel::mapFromSource(). QItemSelection QIdentityProxyModel::mapSelectionFromSource ( const QItemSelection & selection ) const [virtual]Reimplemented from QAbstractProxyModel::mapSelectionFromSource(). QItemSelection QIdentityProxyModel::mapSelectionToSource ( const QItemSelection & selection ) const [virtual]Reimplemented from QAbstractProxyModel::mapSelectionToSource(). QModelIndex QIdentityProxyModel::mapToSource ( const QModelIndex & proxyIndex ) const [virtual]Reimplemented from 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 [virtual]Reimplemented from QAbstractItemModel::match(). QModelIndex QIdentityProxyModel::parent ( const QModelIndex & child ) const [virtual]Reimplemented from QAbstractItemModel::parent(). bool QIdentityProxyModel::removeColumns ( int column, int count, const QModelIndex & parent = QModelIndex() ) [virtual]Переопределено из QAbstractItemModel::removeColumns(). bool QIdentityProxyModel::removeRows ( int row, int count, const QModelIndex & parent = QModelIndex() ) [virtual]Переопределено из QAbstractItemModel::removeRows(). int QIdentityProxyModel::rowCount ( const QModelIndex & parent = QModelIndex() ) const [virtual]Переопределено из QAbstractItemModel::rowCount(). void QIdentityProxyModel::setSourceModel ( QAbstractItemModel * newSourceModel ) [virtual]Reimplemented from QAbstractProxyModel::setSourceModel(). |
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