Qt 4.3: QAbstractListModel Class Reference

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# QAbstractListModel Class Reference
[QtCore module]

The QAbstractListModel class provides an abstract model that can be subclassed to create one-dimensional list models. More...

     #include <QAbstractListModel>

Inherits QAbstractItemModel.

Inherited by QStringListModel.

- List of all members, including inherited members

### Public Functions

- QAbstractListModel ( QObject * parent = 0 )
- ~QAbstractListModel ()
- virtual QModelIndex index ( int row, int column = 0, const QModelIndex & parent = QModelIndex() ) const

- 34 public functions inherited from QAbstractItemModel
- 29 public functions inherited from QObject

### Additional Inherited Members

- 1 property inherited from QObject
- 2 public slots inherited from QAbstractItemModel
- 1 public slot inherited from QObject
- 14 signals inherited from QAbstractItemModel
- 1 signal inherited from QObject
- 5 static public members inherited from QObject
- 14 protected functions inherited from QAbstractItemModel
- 7 protected functions inherited from QObject

## Detailed Description

The QAbstractListModel class provides an abstract model that can be subclassed to create one-dimensional list models.

QAbstractListModel provides a standard interface for models that represent their data as a simple non-hierarchical sequence of items. It is not used directly, but must be subclassed.

Since the model provides a more specialized interface than QAbstractItemModel, it is not suitable for use with tree views; you will need to subclass QAbstractItemModel if you want to provide a model for that purpose. If you need to use a number of list models to manage data, it may be more appropriate to subclass QAbstractTableModel class instead.

Simple models can be created by subclassing this class and implementing the minimum number of required functions. For example, we could implement a simple read-only QStringList-based model that provides a list of strings to a QListView widget. In such a case, we only need to implement the rowCount() function to return the number of items in the list, and the data() function to retrieve items from the list.

Since the model represents a one-dimensional structure, the rowCount() function returns the total number of items in the model. The columnCount() function is implemented for interoperability with all kinds of views, but by default informs views that the model contains only one column.

### Subclassing

Note: Some general guidelines for subclassing models are available in the Model Subclassing Reference.

When subclassing QAbstractListModel, you must provide implementations of the rowCount() and data() functions. Well behaved models also provide a headerData() implementation.

For editable list models, you must also provide an implementation of setData(), implement the flags() function so that it returns a value containing Qt::ItemIsEditable.

Note that QAbstractListModel provides a default implementation of columnCount() that informs views that there is only a single column of items in this model.

Models that provide interfaces to resizable list-like data structures can provide implementations of insertRows() and removeRows(). When implementing these functions, it is important to call the appropriate functions so that all connected views are aware of any changes:

- An insertRows() implementation must call beginInsertRows() before inserting new rows into the data structure, and it must call endInsertRows() immediately afterwards.
- A removeRows() implementation must call beginRemoveRows() before the rows are removed from the data structure, and it must call endRemoveRows() immediately afterwards.

See also Model Classes, Model Subclassing Reference, QAbstractItemView, QAbstractTableModel, and Item Views Puzzle Example.

## Member Function Documentation

### QAbstractListModel::QAbstractListModel ( QObject * parent = 0 )

Constructs an abstract list model with the given parent.

### QAbstractListModel::~QAbstractListModel ()

Destroys the abstract list model.

### QModelIndex QAbstractListModel::index ( int row, int column = 0, const QModelIndex & parent = QModelIndex() ) const `[virtual]`

Returns the index of the data in row and column with parent.

Reimplemented from QAbstractItemModel.

See also parent().