Qt 5.9 | Qt Widgets | C++ Classes | QColumnView

Qt 5.9.9 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

- List of all members, including inherited members

## Properties

- resizeGripsVisible : bool

- 16 properties inherited from QAbstractItemView
- 3 properties inherited from QAbstractScrollArea
- 6 properties inherited from QFrame
- 59 properties inherited from QWidget

## Public Functions

| QColumnView(QWidget *parent = Q_NULLPTR)
| ~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
virtual void | scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible)
virtual void | selectAll()
virtual void | setModel(QAbstractItemModel *model)
virtual void | setRootIndex(const QModelIndex &index)
virtual void | setSelectionModel(QItemSelectionModel *newSelectionModel)
virtual QSize | sizeHint() const
virtual QRect | visualRect(const QModelIndex &index) const

- 59 public functions inherited from QAbstractItemView
- 20 public functions inherited from QAbstractScrollArea
- 14 public functions inherited from QFrame
- 214 public functions inherited from QWidget

## Signals

void | updatePreviewWidget(const QModelIndex &index)

- 7 signals inherited from QAbstractItemView
- 3 signals inherited from QWidget

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

- 37 protected functions inherited from QAbstractItemView
- 20 protected functions inherited from QAbstractScrollArea
- 4 protected functions inherited from QFrame
- 35 protected functions inherited from QWidget

### Additional Inherited Members

- 9 public slots inherited from QAbstractItemView
- 19 public slots inherited from QWidget
- 5 static public members inherited from QWidget
- 9 protected slots inherited from QAbstractItemView
- 1 protected slot inherited from QWidget

## Detailed Description

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

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 = Q_NULLPTR)

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

See also QAbstractItemModel.

### 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().

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

Reimplemented from QAbstractItemView::currentChanged().

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

Reimplemented from QAbstractItemView::horizontalOffset().

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

Reimplemented from QAbstractItemView::indexAt().

### `[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().

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

Reimplemented from QAbstractItemView::isIndexHidden().

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

Reimplemented from QAbstractItemView::moveCursor().

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 0 if there is none.

See also setPreviewWidget() and updatePreviewWidget().

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

Reimplemented from QWidget::resizeEvent().

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

Reimplemented from QAbstractItemView::rowsInserted().

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

Reimplemented from QAbstractScrollArea::scrollContentsBy().

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

Reimplemented from QAbstractItemView::scrollTo().

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

Reimplemented from 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().

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

Reimplemented from QAbstractItemView::setModel().

### 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().

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

Reimplemented from QAbstractItemView::setRootIndex().

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

Reimplemented from QAbstractItemView::setSelection().

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

Reimplemented from QAbstractItemView::setSelectionModel().

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

Reimplemented from QWidget::sizeHint().

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

Reimplemented from QAbstractItemView::verticalOffset().

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

Reimplemented from QAbstractItemView::visualRect().

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

Reimplemented from QAbstractItemView::visualRegionForSelection().