QPersistentModelIndex Class▲
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Header: QPersistentModelIndex
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qmake: QT += core
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Group: QPersistentModelIndex is part of Implicitly Shared Classes, model-view
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▲
See also Model/View Programming, QModelIndex, QAbstractItemModel
Member Function Documentation▲
QPersistentModelIndex::QPersistentModelIndex(const QModelIndex &index)▲
Creates a new QPersistentModelIndex that is a copy of the model index.
QPersistentModelIndex::QPersistentModelIndex(const QPersistentModelIndex &other)▲
Creates a new QPersistentModelIndex that is a copy of the other persistent model index.
[since 5.2] QPersistentModelIndex::QPersistentModelIndex(QPersistentModelIndex &&other)▲
Move-constructs a QPersistentModelIndex instance, making it point at the same object that other was pointing to.
This function was introduced in Qt 5.2.
int QPersistentModelIndex::column() const▲
Returns the column this persistent model index refers to.
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▲
See also Qt::ItemDataRole, QAbstractItemModel::setData()
[since 4.2] Qt::ItemFlags QPersistentModelIndex::flags() const▲
Returns the flags for the item referred to by the index.
This function was introduced in Qt 4.2.
bool QPersistentModelIndex::isValid() const▲
Returns true if this persistent model index is valid; otherwise returns false.
A valid index belongs to a model, and has non-negative row and column numbers.
See Also▲
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▲
int QPersistentModelIndex::row() const▲
Returns the row this persistent model index refers to.
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▲
See also parent()
[since 5.0] void QPersistentModelIndex::swap(QPersistentModelIndex &other)▲
Swaps this persistent modelindex with other. This function is very fast and never fails.
This function was introduced in Qt 5.0.
const QModelIndex &QPersistentModelIndex::operator const QModelIndex &() const▲
Cast operator that returns a const QModelIndex&.
[since 4.2] bool QPersistentModelIndex::operator!=(const QPersistentModelIndex &other) const▲
Returns true if this persistent model index is not equal to the other persistent model index; otherwise returns false.
This function was introduced in Qt 4.2.
bool QPersistentModelIndex::operator!=(const QModelIndex &other) const▲
Returns true if this persistent model index does not refer to the same location as the other model index; otherwise returns false.
[since 4.1] 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.
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.
[since 5.2] QPersistentModelIndex &QPersistentModelIndex::operator=(QPersistentModelIndex &&other)▲
Move-assigns other to this QPersistentModelIndex instance.
This function was introduced in Qt 5.2.
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.
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.
Related Non-Members▲
[since 5.0] uint qHash(const QPersistentModelIndex &index, uint seed = 0)▲
Returns a hash of the QPersistentModelIndex index, using seed to seed the calculation.
This function was introduced in Qt 5.0.
Obsolete Members for QPersistentModelIndex▲
The following members of class QPersistentModelIndex are deprecated. We strongly advise against using them in new code.
Obsolete Member Function Documentation▲
QModelIndex QPersistentModelIndex::child(int row, int column) const▲
This function is deprecated. We strongly advise against using it in new code.
Use QAbstractItemModel::index() instead.
Returns the child of the model index that is stored in the given row and column.