const QAbstractItemModel *QModelIndex:: model() const Returns true if this model index is valid otherwise returns false.Ī valid index belongs to a model, and has non-negative row and column numbers. See also QAbstractItemModel::createIndex(). Returns a void * pointer used by the model to associate the index with the internal data structure. void *QModelIndex:: internalPointer() const Returns a quintptr used by the model to associate the index with the internal data structure. quintptr QModelIndex:: internalId() const Returns the flags for the item referred to by the index. Qt::ItemFlags QModelIndex:: flags() const Returns the data for the given role for the item referred to by the index.

QVariant QModelIndex:: data( int role = Qt::DisplayRole) const Returns a const void * pointer used by the model to associate the index with the internal data structure. const void *QModelIndex:: constInternalPointer() const Returns the column this model index refers to. See also isValid() and QAbstractItemModel. This type of model index is used to indicate that the position in the model is invalid. Member Function Documentation QModelIndex:: QModelIndex()Ĭreates a new empty model index. The sibling() function allows you to traverse items in the model on the same level as the index. The child() function is used to examine items held under the index in the model. The model() function returns the model that the index references as a QAbstractItemModel. When referring to top-level items in a model, supply QModelIndex() as the parent index.

To obtain a model index that refers to an existing item in a model, call QAbstractItemModel::index() with the required row and column values, and the model index of the parent. Each top-level item in a model is represented by a model index that does not have a parent index - in this case, parent() will return an invalid model index, equivalent to an index constructed with the zero argument form of the QModelIndex() constructor. Each index is located in a given row and column, and may have a parent index use row(), column(), and parent() to obtain this information. Model indexes refer to items in models, and contain all the information required to specify their locations in those models. Invalid indexes are often used as parent indexes when referring to top-level items in a model. An invalid model index can be constructed with the QModelIndex constructor. New QModelIndex objects are created by the model using the QAbstractItemModel::createIndex() function. The index is used by item views, delegates, and selection models to locate an item in the model. This class is used as an index into item models derived from QAbstractItemModel.

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