- Qt 5.15
- Qt Widgets
- C++ Classes
- QColumnView
- Qt 5.15.18 Reference Documentation

# QColumnView Class

The QColumnView class provides a model/view implementation of a column view. More...

Header: | #include <QColumnView>
qmake: | QT += widgets
Since: | Qt 4.3
Inherits: | QAbstractItemView

This class was introduced in Qt 4.3.

- List of all members, including inherited members

## Properties

- resizeGripsVisible : bool

## Public Functions

| QColumnView(QWidget *parent = nullptr)
virtual | ~QColumnView()
QList<int> | columnWidths() const
QWidget * | previewWidget() const
bool | resizeGripsVisible() const
void | setColumnWidths(const QList<int> &list)
void | setPreviewWidget(QWidget *widget)
void | setResizeGripsVisible(bool visible)

## Reimplemented Public Functions

virtual QModelIndex | indexAt(const QPoint &point) const override
virtual void | scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) override
virtual void | selectAll() override
virtual void | setModel(QAbstractItemModel *model) override
virtual void | setRootIndex(const QModelIndex &index) override
virtual void | setSelectionModel(QItemSelectionModel *newSelectionModel) override
virtual QSize | sizeHint() const override
virtual QRect | visualRect(const QModelIndex &index) const override

## Signals

void | updatePreviewWidget(const QModelIndex &index)

## Protected Functions

virtual QAbstractItemView * | createColumn(const QModelIndex &index)
void | initializeColumn(QAbstractItemView *column) const

## Reimplemented Protected Functions

virtual void | currentChanged(const QModelIndex &current, const QModelIndex &previous) override
virtual int | horizontalOffset() const override
virtual bool | isIndexHidden(const QModelIndex &index) const override
virtual QModelIndex | moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) override
virtual void | resizeEvent(QResizeEvent *event) override
virtual void | rowsInserted(const QModelIndex &parent, int start, int end) override
virtual void | scrollContentsBy(int dx, int dy) override
virtual void | setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) override
virtual int | verticalOffset() const override
virtual QRegion | visualRegionForSelection(const QItemSelection &selection) const override

## Detailed Description

QColumnView displays a model in a number of QListViews, one for each hierarchy in the tree. This is sometimes referred to as a cascading list.

The QColumnView class is one of the Model/View Classes and is part of Qt's model/view framework.

QColumnView implements the interfaces defined by the QAbstractItemView class to allow it to display data provided by models derived from the QAbstractItemModel class.

See also Model/View Programming.

## Property Documentation

### resizeGripsVisible : bool

This property holds the way to specify if the list views gets resize grips or not

By default, `visible` is set to true

Access functions:

bool | resizeGripsVisible() const
void | setResizeGripsVisible(bool visible)

See also setRootIndex().

## Member Function Documentation

### QColumnView::QColumnView(QWidget *parent = nullptr)

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

See also QAbstractItemModel.

### `[signal]` void QColumnView::updatePreviewWidget(const QModelIndex &index)

This signal is emitted when the preview widget should be updated to provide rich information about index

See also previewWidget().

### `[virtual]` QColumnView::~QColumnView()

Destroys the column view.

### QList<int> QColumnView::columnWidths() const

Returns a list of the width of all the columns in this view.

See also setColumnWidths().

### `[virtual protected]` QAbstractItemView *QColumnView::createColumn(const QModelIndex &index)

To use a custom widget for the final column when you select an item overload this function and return a widget. index is the root index that will be assigned to the view.

Return the new view. QColumnView will automatically take ownership of the widget.

See also setPreviewWidget().

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

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

### `[override virtual protected]` int QColumnView::horizontalOffset() const

Reimplements: QAbstractItemView::horizontalOffset() const.

### `[override virtual]` QModelIndex QColumnView::indexAt(const QPoint &point) const

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

### `[protected]` void QColumnView::initializeColumn(QAbstractItemView *column) const

Copies the behavior and options of the column view and applies them to the column such as the iconSize(), textElideMode() and alternatingRowColors(). This can be useful when reimplementing createColumn().

This function was introduced in Qt 4.4.

See also createColumn().

### `[override virtual protected]` bool QColumnView::isIndexHidden(const QModelIndex &index) const

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

### `[override virtual protected]` QModelIndex QColumnView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)

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

Move left should go to the parent index Move right should go to the child index or down if there is no child

### QWidget *QColumnView::previewWidget() const

Returns the preview widget, or `nullptr` if there is none.

See also setPreviewWidget() and updatePreviewWidget().

### `[override virtual protected]` void QColumnView::resizeEvent(QResizeEvent *event)

Reimplements: QAbstractItemView::resizeEvent(QResizeEvent *event).

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

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

### `[override virtual protected]` void QColumnView::scrollContentsBy(int dx, int dy)

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

### `[override virtual]` void QColumnView::scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible)

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

### `[override virtual]` void QColumnView::selectAll()

Reimplements: QAbstractItemView::selectAll().

### void QColumnView::setColumnWidths(const QList<int> &list)

Sets the column widths to the values given in the list. Extra values in the list are kept and used when the columns are created.

If list contains too few values, only width of the rest of the columns will not be modified.

See also columnWidths() and createColumn().

### `[override virtual]` void QColumnView::setModel(QAbstractItemModel *model)

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

### void QColumnView::setPreviewWidget(QWidget *widget)

Sets the preview widget.

The widget becomes a child of the column view, and will be destroyed when the column area is deleted or when a new widget is set.

See also previewWidget() and updatePreviewWidget().

### `[override virtual]` void QColumnView::setRootIndex(const QModelIndex &index)

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

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

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

### `[override virtual]` void QColumnView::setSelectionModel(QItemSelectionModel *newSelectionModel)

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

### `[override virtual]` QSize QColumnView::sizeHint() const

Reimplements: QAbstractScrollArea::sizeHint() const.

### `[override virtual protected]` int QColumnView::verticalOffset() const

Reimplements: QAbstractItemView::verticalOffset() const.

### `[override virtual]` QRect QColumnView::visualRect(const QModelIndex &index) const

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

### `[override virtual protected]` QRegion QColumnView::visualRegionForSelection(const QItemSelection &selection) const

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