QStandardItemModel Class

 QStandardItemModel model(4, 4);
 for (int row = 0; row < model.rowCount(); ++row) {
     for (int column = 0; column < model.columnCount(); ++column) {
         QStandardItem *item = new QStandardItem(QString("row %0, column %1").arg(row).arg(column));
         model.setItem(row, column, item);
     }
 }

 QStandardItemModel model;
 QStandardItem *parentItem = model.invisibleRootItem();
 for (int i = 0; i < 4; ++i) {
     QStandardItem *item = new QStandardItem(QString("item %0").arg(i));
     parentItem->appendRow(item);
     parentItem = item;
 }

 QTreeView *treeView = new QTreeView(this);
 treeView->setModel(myStandardItemModel);
 connect(treeView, &QTreeView::clicked,
         this, &MyWidget::clicked);

 void MyWidget::clicked(const QModelIndex &index)
 {
     QStandardItem *item = myStandardItemModel->itemFromIndex(index);
     // Do stuff with the item ...
 }

 treeView->scrollTo(item->index());

Member Function Documentation

QStandardItemModel::QStandardItemModel(int rows, int columns, QObject *parent = nullptr)

Constructs a new item model that initially has rows rows and columns columns, and that has the given parent.

QStandardItemModel::QStandardItemModel(QObject *parent = nullptr)

Constructs a new item model with the given parent.

[signal] void QStandardItemModel::itemChanged(QStandardItem *item)

This signal is emitted whenever the data of item has changed.

[virtual] QStandardItemModel::~QStandardItemModel()

Destructs the model. The model destroys all its items.

void QStandardItemModel::appendColumn(const QList<QStandardItem *> &items)

Appends a column containing items. If necessary, the row count is increased to the size of items.

See also insertColumn() and appendRow().

void QStandardItemModel::appendRow(const QList<QStandardItem *> &items)

Appends a row containing items. If necessary, the column count is increased to the size of items.

See also insertRow() and appendColumn().

void QStandardItemModel::appendRow(QStandardItem *item)

This is an overloaded function.

When building a list or a tree that has only one column, this function provides a convenient way to append a single new item.

void QStandardItemModel::clear()

Removes all items (including header items) from the model and sets the number of rows and columns to zero.

See also removeColumns() and removeRows().

[override virtual] bool QStandardItemModel::clearItemData(const QModelIndex &index)

Reimplements: QAbstractItemModel::clearItemData(const QModelIndex &index).

[override virtual] int QStandardItemModel::columnCount(const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractItemModel::columnCount(const QModelIndex &parent) const.

See also setColumnCount().

[override virtual] QVariant QStandardItemModel::data(const QModelIndex &index, int role = Qt::DisplayRole) const

Reimplements: QAbstractItemModel::data(const QModelIndex &index, int role) const.

See also setData().

[override virtual] bool QStandardItemModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)

Reimplements: QAbstractItemModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent).

QList<QStandardItem *> QStandardItemModel::findItems(const QString &text, Qt::MatchFlags flags = Qt::MatchExactly, int column = 0) const

Returns a list of items that match the given text, using the given flags, in the given column.

[override virtual] Qt::ItemFlags QStandardItemModel::flags(const QModelIndex &index) const

Reimplements: QAbstractItemModel::flags(const QModelIndex &index) const.

[override virtual] bool QStandardItemModel::hasChildren(const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractItemModel::hasChildren(const QModelIndex &parent) const.

[override virtual] QVariant QStandardItemModel::headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const

Reimplements: QAbstractItemModel::headerData(int section, Qt::Orientation orientation, int role) const.

See also setHeaderData().

QStandardItem *QStandardItemModel::horizontalHeaderItem(int column) const

Returns the horizontal header item for column if one has been set; otherwise returns nullptr.

See also setHorizontalHeaderItem() and verticalHeaderItem().

[override virtual] QModelIndex QStandardItemModel::index(int row, int column, const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractItemModel::index(int row, int column, const QModelIndex &parent) const.

QModelIndex QStandardItemModel::indexFromItem(const QStandardItem *item) const

Returns the QModelIndex associated with the given item.

Use this function when you want to perform an operation that requires the QModelIndex of the item, such as QAbstractItemView::scrollTo(). QStandardItem::index() is provided as convenience; it is equivalent to calling this function.

See also itemFromIndex() and QStandardItem::index().

void QStandardItemModel::insertColumn(int column, const QList<QStandardItem *> &items)

Inserts a column at column containing items. If necessary, the row count is increased to the size of items.

See also takeColumn(), appendColumn(), and insertRow().

bool QStandardItemModel::insertColumn(int column, const QModelIndex &parent = QModelIndex())

Inserts a single column before the given column in the child items of the parent specified. Returns true if the column is inserted; otherwise returns false.

See also insertColumns(), insertRow(), and removeColumn().

[override virtual] bool QStandardItemModel::insertColumns(int column, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::insertColumns(int column, int count, const QModelIndex &parent).

void QStandardItemModel::insertRow(int row, const QList<QStandardItem *> &items)

Inserts a row at row containing items. If necessary, the column count is increased to the size of items.

See also takeRow(), appendRow(), and insertColumn().

void QStandardItemModel::insertRow(int row, QStandardItem *item)

This is an overloaded function.

Inserts a row at row containing item.

When building a list or a tree that has only one column, this function provides a convenient way to append a single new item.

bool QStandardItemModel::insertRow(int row, const QModelIndex &parent = QModelIndex())

Inserts a single row before the given row in the child items of the parent specified. Returns true if the row is inserted; otherwise returns false.

See also insertRows(), insertColumn(), and removeRow().

[override virtual] bool QStandardItemModel::insertRows(int row, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::insertRows(int row, int count, const QModelIndex &parent).

QStandardItem *QStandardItemModel::invisibleRootItem() const

Returns the model's invisible root item.

The invisible root item provides access to the model's top-level items through the QStandardItem API, making it possible to write functions that can treat top-level items and their children in a uniform way; for example, recursive functions involving a tree model.

Note: Calling index() on the QStandardItem object retrieved from this function is not valid.

QStandardItem *QStandardItemModel::item(int row, int column = 0) const

Returns the item for the given row and column if one has been set; otherwise returns nullptr.

See also setItem(), takeItem(), and itemFromIndex().

[override virtual] QMap<int, QVariant> QStandardItemModel::itemData(const QModelIndex &index) const

Reimplements: QAbstractItemModel::itemData(const QModelIndex &index) const.

See also setItemData().

QStandardItem *QStandardItemModel::itemFromIndex(const QModelIndex &index) const

Returns a pointer to the QStandardItem associated with the given index.

Calling this function is typically the initial step when processing QModelIndex-based signals from a view, such as QAbstractItemView::activated(). In your slot, you call itemFromIndex(), with the QModelIndex carried by the signal as argument, to obtain a pointer to the corresponding QStandardItem.

Note that this function will lazily create an item for the index (using itemPrototype()), and set it in the parent item's child table, if no item already exists at that index.

If index is an invalid index, this function returns nullptr.

See also indexFromItem().

const QStandardItem *QStandardItemModel::itemPrototype() const

Returns the item prototype used by the model. The model uses the item prototype as an item factory when it needs to construct new items on demand (for instance, when a view or item delegate calls setData()).

See also setItemPrototype().

[override virtual] QMimeData *QStandardItemModel::mimeData(const QModelIndexList &indexes) const

Reimplements: QAbstractItemModel::mimeData(const QModelIndexList &indexes) const.

[override virtual] QStringList QStandardItemModel::mimeTypes() const

Reimplements: QAbstractItemModel::mimeTypes() const.

[override virtual] void QStandardItemModel::multiData(const QModelIndex &index, QModelRoleDataSpan roleDataSpan) const

Reimplements: QAbstractItemModel::multiData(const QModelIndex &index, QModelRoleDataSpan roleDataSpan) const.

[override virtual] QModelIndex QStandardItemModel::parent(const QModelIndex &child) const

Reimplements: QAbstractItemModel::parent(const QModelIndex &index) const.

[override virtual] bool QStandardItemModel::removeColumns(int column, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::removeColumns(int column, int count, const QModelIndex &parent).

[override virtual] bool QStandardItemModel::removeRows(int row, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::removeRows(int row, int count, const QModelIndex &parent).

[override virtual] QHash<int, QByteArray> QStandardItemModel::roleNames() const

Reimplements: QAbstractItemModel::roleNames() const.

reimp

[override virtual] int QStandardItemModel::rowCount(const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractItemModel::rowCount(const QModelIndex &parent) const.

See also setRowCount().

void QStandardItemModel::setColumnCount(int columns)

Sets the number of columns in this model to columns. If this is less than columnCount(), the data in the unwanted columns is discarded.

See also columnCount() and setRowCount().

[override virtual] bool QStandardItemModel::setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole)

Reimplements: QAbstractItemModel::setData(const QModelIndex &index, const QVariant &value, int role).

See also data().

[override virtual] bool QStandardItemModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role = Qt::EditRole)

Reimplements: QAbstractItemModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role).

See also headerData().

void QStandardItemModel::setHorizontalHeaderItem(int column, QStandardItem *item)

Sets the horizontal header item for column to item. The model takes ownership of the item. If necessary, the column count is increased to fit the item. The previous header item (if there was one) is deleted.

See also horizontalHeaderItem(), setHorizontalHeaderLabels(), and setVerticalHeaderItem().

void QStandardItemModel::setHorizontalHeaderLabels(const QStringList &labels)

Sets the horizontal header labels using labels. If necessary, the column count is increased to the size of labels.

See also setHorizontalHeaderItem().

void QStandardItemModel::setItem(int row, int column, QStandardItem *item)

Sets the item for the given row and column to item. The model takes ownership of the item. If necessary, the row count and column count are increased to fit the item. The previous item at the given location (if there was one) is deleted.

See also item().

void QStandardItemModel::setItem(int row, QStandardItem *item)

This is an overloaded function.

[override virtual] bool QStandardItemModel::setItemData(const QModelIndex &index, const QMap<int, QVariant> &roles)

Reimplements: QAbstractItemModel::setItemData(const QModelIndex &index, const QMap<int, QVariant> &roles).

See also itemData().

void QStandardItemModel::setItemPrototype(const QStandardItem *item)

Sets the item prototype for the model to the specified item. The model takes ownership of the prototype.

The item prototype acts as a QStandardItem factory, by relying on the QStandardItem::clone() function. To provide your own prototype, subclass QStandardItem, reimplement QStandardItem::clone() and set the prototype to be an instance of your custom class. Whenever QStandardItemModel needs to create an item on demand (for instance, when a view or item delegate calls setData())), the new items will be instances of your custom class.

See also itemPrototype() and QStandardItem::clone().

void QStandardItemModel::setItemRoleNames(const QHash<int, QByteArray> &roleNames)

Sets the item role names to roleNames.

void QStandardItemModel::setRowCount(int rows)

Sets the number of rows in this model to rows. If this is less than rowCount(), the data in the unwanted rows is discarded.

See also rowCount() and setColumnCount().

void QStandardItemModel::setVerticalHeaderItem(int row, QStandardItem *item)

Sets the vertical header item for row to item. The model takes ownership of the item. If necessary, the row count is increased to fit the item. The previous header item (if there was one) is deleted.

See also verticalHeaderItem(), setVerticalHeaderLabels(), and setHorizontalHeaderItem().

void QStandardItemModel::setVerticalHeaderLabels(const QStringList &labels)

Sets the vertical header labels using labels. If necessary, the row count is increased to the size of labels.

See also setVerticalHeaderItem().

[override virtual] void QStandardItemModel::sort(int column, Qt::SortOrder order = Qt::AscendingOrder)

Reimplements: QAbstractItemModel::sort(int column, Qt::SortOrder order).

[override virtual] Qt::DropActions QStandardItemModel::supportedDropActions() const

Reimplements: QAbstractItemModel::supportedDropActions() const.

QStandardItemModel supports both copy and move.

QList<QStandardItem *> QStandardItemModel::takeColumn(int column)

Removes the given column without deleting the column items, and returns a list of pointers to the removed items. The model releases ownership of the items. For items in the column that have not been set, the corresponding pointers in the list will be nullptr.

See also takeRow().

QStandardItem *QStandardItemModel::takeHorizontalHeaderItem(int column)

Removes the horizontal header item at column from the header without deleting it, and returns a pointer to the item. The model releases ownership of the item.

See also horizontalHeaderItem() and takeVerticalHeaderItem().

QStandardItem *QStandardItemModel::takeItem(int row, int column = 0)

Removes the item at (row, column) without deleting it. The model releases ownership of the item.

See also item(), takeRow(), and takeColumn().

QList<QStandardItem *> QStandardItemModel::takeRow(int row)

Removes the given row without deleting the row items, and returns a list of pointers to the removed items. The model releases ownership of the items. For items in the row that have not been set, the corresponding pointers in the list will be nullptr.

See also takeColumn().

QStandardItem *QStandardItemModel::takeVerticalHeaderItem(int row)

Removes the vertical header item at row from the header without deleting it, and returns a pointer to the item. The model releases ownership of the item.

See also verticalHeaderItem() and takeHorizontalHeaderItem().

QStandardItem *QStandardItemModel::verticalHeaderItem(int row) const

Returns the vertical header item for row row if one has been set; otherwise returns nullptr.

See also setVerticalHeaderItem() and horizontalHeaderItem().