QTreeView Class

     QFileSystemModel *model = new QFileSystemModel;
     model->setRootPath(QDir::currentPath());
     QTreeView *tree = new QTreeView(splitter);
     tree->setModel(model);

Member Function Documentation

QTreeView::QTreeView(QWidget *parent = nullptr)

Constructs a tree view with a parent to represent a model's data. Use setModel() to set the model.

See also QAbstractItemModel.

[slot] void QTreeView::collapse(const QModelIndex &index)

Collapses the model item specified by the index.

See also collapsed().

[slot] void QTreeView::collapseAll()

Collapses all expanded items.

See also expandAll(), expand(), collapse(), and setExpanded().

[signal] void QTreeView::collapsed(const QModelIndex &index)

This signal is emitted when the item specified by index is collapsed.

[protected slot] void QTreeView::columnCountChanged(int oldCount, int newCount)

Informs the tree view that the number of columns in the tree view has changed from oldCount to newCount.

[protected slot] void QTreeView::columnMoved()

This slot is called whenever a column has been moved.

[protected slot] void QTreeView::columnResized(int column, int oldSize, int newSize)

This function is called whenever column's size is changed in the header. oldSize and newSize give the previous size and the new size in pixels.

See also setColumnWidth().

[slot] void QTreeView::expand(const QModelIndex &index)

Expands the model item specified by the index.

See also expanded().

[slot] void QTreeView::expandAll()

Expands all expandable items.

Note: This function will not try to fetch more data.

Warning: If the model contains a large number of items, this function will take some time to execute.

See also collapseAll(), expand(), collapse(), and setExpanded().

[slot, since 5.13] void QTreeView::expandRecursively(const QModelIndex &index, int depth = -1)

Expands the item at the given index and all its children to the given depth. The depth is relative to the given index. A depth of -1 will expand all children, a depth of 0 will only expand the given index.

Note: This function will not try to fetch more data.

Warning: If the model contains a large number of items, this function will take some time to execute.

This function was introduced in Qt 5.13.

See also expandAll().

[slot] void QTreeView::expandToDepth(int depth)

Expands all expandable items to the given depth.

Note: This function will not try to fetch more data.

See also expandAll(), collapseAll(), expand(), collapse(), and setExpanded().

[signal] void QTreeView::expanded(const QModelIndex &index)

This signal is emitted when the item specified by index is expanded.

See also setExpanded().

[slot] void QTreeView::hideColumn(int column)

Hides the column given.

Note: This function should only be called after the model has been initialized, as the view needs to know the number of columns in order to hide column.

See also showColumn() and setColumnHidden().

[slot] void QTreeView::resizeColumnToContents(int column)

Resizes the column given to the size of its contents.

See also columnWidth(), setColumnWidth(), sizeHintForColumn(), and QHeaderView::resizeContentsPrecision().

[protected slot] void QTreeView::rowsRemoved(const QModelIndex &parent, int start, int end)

Informs the view that the rows from the start row to the end row inclusive have been removed from the given parent model item.

[slot] void QTreeView::showColumn(int column)

Shows the given column in the tree view.

See also hideColumn() and setColumnHidden().

[slot] void QTreeView::sortByColumn(int column, Qt::SortOrder order)

Sorts the model by the values in the given column and order.

column may be -1, in which case no sort indicator will be shown and the model will return to its natural, unsorted order. Note that not all models support this and may even crash in this case.

See also sortingEnabled.

[virtual] QTreeView::~QTreeView()

Destroys the tree view.

[override virtual protected] void QTreeView::changeEvent(QEvent *event)

Reimplements: QFrame::changeEvent(QEvent *ev).

int QTreeView::columnAt(int x) const

Returns the column in the tree view whose header covers the x coordinate given.

int QTreeView::columnViewportPosition(int column) const

Returns the horizontal position of the column in the viewport.

int QTreeView::columnWidth(int column) const

Returns the width of the column.

See also resizeColumnToContents() and setColumnWidth().

[override virtual protected] void QTreeView::currentChanged(const QModelIndex &current, const QModelIndex &previous)

Reimplements: QAbstractItemView::currentChanged(const QModelIndex &current, const QModelIndex &previous).

[override virtual] void QTreeView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QList<int> &roles = QList<int>())

Reimplements: QAbstractItemView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QList<int> &roles).

[override virtual protected] void QTreeView::dragMoveEvent(QDragMoveEvent *event)

Reimplements: QAbstractItemView::dragMoveEvent(QDragMoveEvent *event).

[virtual protected] void QTreeView::drawBranches(QPainter *painter, const QRect &rect, const QModelIndex &index) const

Draws the branches in the tree view on the same row as the model item index, using the painter given. The branches are drawn in the rectangle specified by rect.

[virtual protected] void QTreeView::drawRow(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const

Draws the row in the tree view that contains the model item index, using the painter given. The option controls how the item is displayed.

See also setAlternatingRowColors().

[protected] void QTreeView::drawTree(QPainter *painter, const QRegion &region) const

Draws the part of the tree intersecting the given region using the specified painter.

See also paintEvent().

QHeaderView *QTreeView::header() const

Returns the header for the tree view.

See also setHeader() and QAbstractItemModel::headerData().

[override virtual protected] int QTreeView::horizontalOffset() const

Reimplements: QAbstractItemView::horizontalOffset() const.

Returns the horizontal offset of the items in the treeview.

Note that the tree view uses the horizontal header section positions to determine the positions of columns in the view.

See also verticalOffset().

QModelIndex QTreeView::indexAbove(const QModelIndex &index) const

Returns the model index of the item above index.

[override virtual] QModelIndex QTreeView::indexAt(const QPoint &point) const

Reimplements: QAbstractItemView::indexAt(const QPoint &point) const.

QModelIndex QTreeView::indexBelow(const QModelIndex &index) const

Returns the model index of the item below index.

[protected] int QTreeView::indexRowSizeHint(const QModelIndex &index) const

Returns the size hint for the row indicated by index.

See also sizeHintForColumn() and uniformRowHeights().

bool QTreeView::isColumnHidden(int column) const

Returns true if the column is hidden; otherwise returns false.

See also hideColumn() and isRowHidden().

bool QTreeView::isExpanded(const QModelIndex &index) const

Returns true if the model item index is expanded; otherwise returns false.

See also expand(), expanded(), and setExpanded().

bool QTreeView::isFirstColumnSpanned(int row, const QModelIndex &parent) const

Returns true if the item in first column in the given row of the parent is spanning all the columns; otherwise returns false.

See also setFirstColumnSpanned().

[override virtual protected] bool QTreeView::isIndexHidden(const QModelIndex &index) const

Reimplements: QAbstractItemView::isIndexHidden(const QModelIndex &index) const.

bool QTreeView::isRowHidden(int row, const QModelIndex &parent) const

Returns true if the item in the given row of the parent is hidden; otherwise returns false.

See also setRowHidden() and isColumnHidden().

[override virtual protected] void QTreeView::keyPressEvent(QKeyEvent *event)

Reimplements: QAbstractItemView::keyPressEvent(QKeyEvent *event).

[override virtual] void QTreeView::keyboardSearch(const QString &search)

Reimplements: QAbstractItemView::keyboardSearch(const QString &search).

[override virtual protected] void QTreeView::mouseDoubleClickEvent(QMouseEvent *event)

Reimplements: QAbstractItemView::mouseDoubleClickEvent(QMouseEvent *event).

[override virtual protected] void QTreeView::mouseMoveEvent(QMouseEvent *event)

Reimplements: QAbstractItemView::mouseMoveEvent(QMouseEvent *event).

[override virtual protected] void QTreeView::mousePressEvent(QMouseEvent *event)

Reimplements: QAbstractItemView::mousePressEvent(QMouseEvent *event).

[override virtual protected] void QTreeView::mouseReleaseEvent(QMouseEvent *event)

Reimplements: QAbstractItemView::mouseReleaseEvent(QMouseEvent *event).

[override virtual protected] QModelIndex QTreeView::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers)

Reimplements: QAbstractItemView::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers).

Move the cursor in the way described by cursorAction, using the information provided by the button modifiers.

[override virtual protected] void QTreeView::paintEvent(QPaintEvent *event)

Reimplements: QAbstractScrollArea::paintEvent(QPaintEvent *event).

[override virtual] void QTreeView::reset()

Reimplements: QAbstractItemView::reset().

[protected] int QTreeView::rowHeight(const QModelIndex &index) const

Returns the height of the row indicated by the given index.

See also indexRowSizeHint().

[override virtual protected] void QTreeView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)

Reimplements: QAbstractItemView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end).

Informs the view that the rows from the start row to the end row inclusive are about to removed from the given parent model item.

[override virtual protected] void QTreeView::rowsInserted(const QModelIndex &parent, int start, int end)

Reimplements: QAbstractItemView::rowsInserted(const QModelIndex &parent, int start, int end).

Informs the view that the rows from the start row to the end row inclusive have been inserted into the parent model item.

[override virtual protected] void QTreeView::scrollContentsBy(int dx, int dy)

Reimplements: QAbstractScrollArea::scrollContentsBy(int dx, int dy).

Scrolls the contents of the tree view by (dx, dy).

[override virtual] void QTreeView::scrollTo(const QModelIndex &index, QAbstractItemView::ScrollHint hint = EnsureVisible)

Reimplements: QAbstractItemView::scrollTo(const QModelIndex &index, QAbstractItemView::ScrollHint hint).

Scroll the contents of the tree view until the given model item index is visible. The hint parameter specifies more precisely where the item should be located after the operation. If any of the parents of the model item are collapsed, they will be expanded to ensure that the model item is visible.

[override virtual] void QTreeView::selectAll()

Reimplements: QAbstractItemView::selectAll().

[override virtual protected] QModelIndexList QTreeView::selectedIndexes() const

Reimplements: QAbstractItemView::selectedIndexes() const.

[override virtual protected] void QTreeView::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)

Reimplements: QAbstractItemView::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected).

void QTreeView::setColumnHidden(int column, bool hide)

If hide is true the column is hidden, otherwise the column is shown.

See also isColumnHidden(), hideColumn(), and setRowHidden().

void QTreeView::setColumnWidth(int column, int width)

Sets the width of the given column to the width specified.

See also columnWidth() and resizeColumnToContents().

void QTreeView::setExpanded(const QModelIndex &index, bool expanded)

Sets the item referred to by index to either collapse or expanded, depending on the value of expanded.

See also expanded(), expand(), and isExpanded().

void QTreeView::setFirstColumnSpanned(int row, const QModelIndex &parent, bool span)

If span is true the item in the first column in the row with the given parent is set to span all columns, otherwise all items on the row are shown.

See also isFirstColumnSpanned().

void QTreeView::setHeader(QHeaderView *header)

Sets the header for the tree view, to the given header.

The view takes ownership over the given header and deletes it when a new header is set.

See also QAbstractItemModel::headerData().

[override virtual] void QTreeView::setModel(QAbstractItemModel *model)

Reimplements: QAbstractItemView::setModel(QAbstractItemModel *model).

[override virtual] void QTreeView::setRootIndex(const QModelIndex &index)

Reimplements: QAbstractItemView::setRootIndex(const QModelIndex &index).

void QTreeView::setRowHidden(int row, const QModelIndex &parent, bool hide)

If hide is true the row with the given parent is hidden, otherwise the row is shown.

See also isRowHidden() and setColumnHidden().

[override virtual protected] void QTreeView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)

Reimplements: QAbstractItemView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags flags).

Applies the selection command to the items in or touched by the rectangle, rect.

See also selectionCommand().

[override virtual] void QTreeView::setSelectionModel(QItemSelectionModel *selectionModel)

Reimplements: QAbstractItemView::setSelectionModel(QItemSelectionModel *selectionModel).

[since 5.2] void QTreeView::setTreePosition(int index)

This specifies that the tree structure should be placed at logical index index. If set to -1 then the tree will always follow visual index 0.

This function was introduced in Qt 5.2.

See also treePosition(), QHeaderView::swapSections(), and QHeaderView::moveSection().

[override virtual protected] int QTreeView::sizeHintForColumn(int column) const

Reimplements: QAbstractItemView::sizeHintForColumn(int column) const.

Returns the size hint for the column's width or -1 if there is no model.

If you need to set the width of a given column to a fixed value, call QHeaderView::resizeSection() on the view's header.

If you reimplement this function in a subclass, note that the value you return is only used when resizeColumnToContents() is called. In that case, if a larger column width is required by either the view's header or the item delegate, that width will be used instead.

See also QWidget::sizeHint, header(), and QHeaderView::resizeContentsPrecision().

[override virtual protected] void QTreeView::timerEvent(QTimerEvent *event)

Reimplements: QAbstractItemView::timerEvent(QTimerEvent *event).

[since 5.2] int QTreeView::treePosition() const

Return the logical index the tree is set on. If the return value is -1 then the tree is placed on the visual index 0.

This function was introduced in Qt 5.2.

See also setTreePosition().

[override virtual protected] void QTreeView::updateGeometries()

Reimplements: QAbstractItemView::updateGeometries().

[override virtual protected] int QTreeView::verticalOffset() const

Reimplements: QAbstractItemView::verticalOffset() const.

Returns the vertical offset of the items in the tree view.

See also horizontalOffset().

[override virtual protected] bool QTreeView::viewportEvent(QEvent *event)

Reimplements: QAbstractItemView::viewportEvent(QEvent *event).

[override virtual protected] QSize QTreeView::viewportSizeHint() const

Reimplements: QAbstractItemView::viewportSizeHint() const.

[override virtual] QRect QTreeView::visualRect(const QModelIndex &index) const

Reimplements: QAbstractItemView::visualRect(const QModelIndex &index) const.

Returns the rectangle on the viewport occupied by the item at index. If the index is not visible or explicitly hidden, the returned rectangle is invalid.

[override virtual protected] QRegion QTreeView::visualRegionForSelection(const QItemSelection &selection) const

Reimplements: QAbstractItemView::visualRegionForSelection(const QItemSelection &selection) const.

Returns the rectangle from the viewport of the items in the given selection.

Since 4.7, the returned region only contains rectangles intersecting (or included in) the viewport.