QPersistentModelIndex Class
The QPersistentModelIndex class is used to locate data in a data model. More...
Header: | #include <QPersistentModelIndex> |
qmake: | QT += core |
Public Functions
QPersistentModelIndex(const QModelIndex &index) | |
QPersistentModelIndex & | operator=(const QModelIndex &other) |
QPersistentModelIndex & | operator=(const QPersistentModelIndex &other) |
QVariant | data(int role = Qt::DisplayRole) const |
Qt::ItemFlags | flags() const |
const QAbstractItemModel * | model() const |
QModelIndex | parent() const |
QModelIndex | sibling(int row, int column) const |
bool | operator<(const QPersistentModelIndex &other) const |
bool | operator==(const QPersistentModelIndex &other) const |
bool | operator==(const QModelIndex &other) const |
Detailed Description
A QPersistentModelIndex is a model index that can be stored by an application, and later used to access information in a model. Unlike the QModelIndex class, it is safe to store a QPersistentModelIndex since the model will ensure that references to items will continue to be valid as long as they can be accessed by the model.
It is good practice to check that persistent model indexes are valid before using them.
See also Model/View Programming, QModelIndex, and QAbstractItemModel.
Member Function Documentation
QPersistentModelIndex::QPersistentModelIndex(const QModelIndex &index)
Creates a new QPersistentModelIndex that is a copy of the model index.
QPersistentModelIndex &QPersistentModelIndex::operator=(const QModelIndex &other)
Sets the persistent model index to refer to the same item in a model as the other model index.
QPersistentModelIndex &QPersistentModelIndex::operator=(const QPersistentModelIndex &other)
Sets the persistent model index to refer to the same item in a model as the other persistent model index.
QVariant QPersistentModelIndex::data(int role = Qt::DisplayRole) const
Returns the data for the given role for the item referred to by the index.
See also Qt::ItemDataRole and QAbstractItemModel::setData().
Qt::ItemFlags QPersistentModelIndex::flags() const
Returns the flags for the item referred to by the index.
This function was introduced in Qt 4.2.
const QAbstractItemModel *QPersistentModelIndex::model() const
Returns the model that the index belongs to.
QModelIndex QPersistentModelIndex::parent() const
Returns the parent QModelIndex for this persistent index, or an invalid QModelIndex if it has no parent.
See also sibling() and model().
QModelIndex QPersistentModelIndex::sibling(int row, int column) const
Returns the sibling at row and column or an invalid QModelIndex if there is no sibling at this position.
See also parent().
bool QPersistentModelIndex::operator<(const QPersistentModelIndex &other) const
Returns true
if this persistent model index is smaller than the other persistent model index; otherwise returns false
.
The internal data pointer, row, column, and model values in the persistent model index are used when comparing with another persistent model index.
This function was introduced in Qt 4.1.
bool QPersistentModelIndex::operator==(const QPersistentModelIndex &other) const
Returns true
if this persistent model index is equal to the other persistent model index; otherwise returns false
.
The internal data pointer, row, column, and model values in the persistent model index are used when comparing with another persistent model index.
bool QPersistentModelIndex::operator==(const QModelIndex &other) const
Returns true
if this persistent model index refers to the same location as the other model index; otherwise returns false
.
The internal data pointer, row, column, and model values in the persistent model index are used when comparing with another model index.