QPersistentModelIndex Class
The QPersistentModelIndex class is used to locate data in a data model, and stays valid when the model changes. More…
| Header | #include <QPersistentModelIndex> |
|---|---|
| CMake | target_link_libraries(app PRIVATE Nt::Core) |
| Module | Nt Core C++ Classes |
List of all members, including inherited members
Public Functions
| QPersistentModelIndex() | |
| QPersistentModelIndex(const QModelIndex &index) | |
| QPersistentModelIndex(const QPersistentModelIndex &other) | |
| QPersistentModelIndex(QPersistentModelIndex &&other) | |
| ~QPersistentModelIndex() | |
| QPersistentModelIndex & | operator=(const QPersistentModelIndex &other) |
| QPersistentModelIndex & | operator=(QPersistentModelIndex &&other) |
| QPersistentModelIndex & | operator=(const QModelIndex &other) |
| void | swap(QPersistentModelIndex &other) |
| operator QModelIndex() const | |
| int | row() const |
| int | column() const |
| void * | internalPointer() const |
| const void * | constInternalPointer() const |
| quintptr | internalId() const |
| QModelIndex | parent() const |
| QModelIndex | sibling(int row, int column) const |
| QVariant | data(int role = Qt::DisplayRole) const |
| Qt::ItemFlags | flags() const |
| const QAbstractItemModel * | model() const |
| bool | isValid() const |
Detailed Description
A persistent index follows its item when rows and columns are inserted, removed or moved, and becomes invalid when the item is removed or the model is reset. Models that rearrange their items (for example when sorting) update persistent indexes with changePersistentIndex().
See also QModelIndex and QAbstractItemModel.
Differences from Qt
Each persistent index made from a QModelIndex has its own record in the model, which copies share; Qt shares one record per item.
Member Function Documentation
QPersistentModelIndex::QPersistentModelIndex()
Constructs an invalid persistent index.
QPersistentModelIndex::QPersistentModelIndex(const QModelIndex &index)
Constructs a persistent index that follows the item at index.
QPersistentModelIndex::QPersistentModelIndex(const QPersistentModelIndex &other)
Constructs a copy of other, which follows the same item.
QPersistentModelIndex::QPersistentModelIndex(QPersistentModelIndex &&other)
Move-constructs a persistent index from other.
QPersistentModelIndex::~QPersistentModelIndex()
Destroys the persistent index.
int QPersistentModelIndex::column() const
Returns the current column of the item, or -1.
const void * QPersistentModelIndex::constInternalPointer() const
Returns the pointer the model stored in the index, as a pointer to const.
This function was introduced in 6.0.
QVariant QPersistentModelIndex::data(int role = Qt::DisplayRole) const
Returns the data of the item for role.
Qt::ItemFlags QPersistentModelIndex::flags() const
Returns the flags of the item.
quintptr QPersistentModelIndex::internalId() const
Returns the integer the model stored in the index.
void * QPersistentModelIndex::internalPointer() const
Returns the pointer the model stored in the index.
bool QPersistentModelIndex::isValid() const
Returns true if the item still exists; otherwise returns false.
const QAbstractItemModel * QPersistentModelIndex::model() const
Returns the model of the item, or nullptr.
QPersistentModelIndex::operator QModelIndex() const
Returns the current index of the item, or an invalid index.
QPersistentModelIndex & QPersistentModelIndex::operator=(const QPersistentModelIndex &other)
Assigns other to this persistent index and returns a reference to it.
QPersistentModelIndex & QPersistentModelIndex::operator=(QPersistentModelIndex &&other)
Move-assigns other to this persistent index and returns a reference to it.
QPersistentModelIndex & QPersistentModelIndex::operator=(const QModelIndex &other)
Makes this persistent index follow the item at other and returns a reference to it.
QModelIndex QPersistentModelIndex::parent() const
Returns the parent of the item.
int QPersistentModelIndex::row() const
Returns the current row of the item, or -1.
QModelIndex QPersistentModelIndex::sibling(int row, int column) const
Returns the index at row and column under the same parent.
void QPersistentModelIndex::swap(QPersistentModelIndex &other)
Swaps this index with other.