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<title>Qt 4.6: QAbstractListModel Class Reference</title>
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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">QAbstractListModel Class Reference<br /><span class="small-subtitle">[<a href="qtcore.html">QtCore</a> module]</span>
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<p>The QAbstractListModel class provides an abstract model that can be subclassed to create one-dimensional list models. <a href="#details">More...</a></p>
<pre> #include <QAbstractListModel></pre><p>Inherits <a href="qabstractitemmodel.html">QAbstractItemModel</a>.</p>
<p>Inherited by <a href="qstringlistmodel.html">QStringListModel</a>.</p>
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<li><a href="qabstractlistmodel-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qabstractlistmodel.html#QAbstractListModel">QAbstractListModel</a></b> ( QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qabstractlistmodel.html#dtor.QAbstractListModel">~QAbstractListModel</a></b> ()</td></tr>
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<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><b><a href="qabstractlistmodel.html#dropMimeData">dropMimeData</a></b> ( const QMimeData * <i>data</i>, Qt::DropAction <i>action</i>, int <i>row</i>, int <i>column</i>, const QModelIndex & <i>parent</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual QModelIndex </td><td class="memItemRight" valign="bottom"><b><a href="qabstractlistmodel.html#index">index</a></b> ( int <i>row</i>, int <i>column</i> = 0, const QModelIndex & <i>parent</i> = QModelIndex() ) const</td></tr>
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<li><div bar="2" class="fn"></div>35 public functions inherited from <a href="qabstractitemmodel.html#public-functions">QAbstractItemModel</a></li>
<li><div bar="2" class="fn"></div>29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
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<h3>Additional Inherited Members</h3>
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<li><div class="fn"></div>1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li><div class="fn"></div>2 public slots inherited from <a href="qabstractitemmodel.html#public-slots">QAbstractItemModel</a></li>
<li><div class="fn"></div>1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li><div class="fn"></div>18 signals inherited from <a href="qabstractitemmodel.html#signals">QAbstractItemModel</a></li>
<li><div class="fn"></div>1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
<li><div class="fn"></div>5 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li><div class="fn"></div>21 protected functions inherited from <a href="qabstractitemmodel.html#protected-functions">QAbstractItemModel</a></li>
<li><div class="fn"></div>7 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
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<a name="details"></a>
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<h2>Detailed Description</h2>
<p>The QAbstractListModel class provides an abstract model that can be subclassed to create one-dimensional list models.</p>
<p>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.</p>
<p>Since the model provides a more specialized interface than <a href="qabstractitemmodel.html">QAbstractItemModel</a>, it is not suitable for use with tree views; you will need to subclass <a href="qabstractitemmodel.html">QAbstractItemModel</a> 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 <a href="qabstracttablemodel.html">QAbstractTableModel</a> class instead.</p>
<p>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 <a href="qstringlist.html">QStringList</a>-based model that provides a list of strings to a <a href="qlistview.html">QListView</a> widget. In such a case, we only need to implement the <a href="qabstractitemmodel.html#rowCount">rowCount</a>() function to return the number of items in the list, and the <a href="qabstractitemmodel.html#data">data</a>() function to retrieve items from the list.</p>
<p>Since the model represents a one-dimensional structure, the <a href="qabstractitemmodel.html#rowCount">rowCount</a>() function returns the total number of items in the model. The <a href="qabstractitemmodel.html#columnCount">columnCount</a>() function is implemented for interoperability with all kinds of views, but by default informs views that the model contains only one column.</p>
<a name="subclassing"></a>
<h3>Subclassing</h3>
<p>When subclassing QAbstractListModel, you must provide implementations of the <a href="qabstractitemmodel.html#rowCount">rowCount</a>() and <a href="qabstractitemmodel.html#data">data</a>() functions. Well behaved models also provide a <a href="qabstractitemmodel.html#headerData">headerData</a>() implementation.</p>
<p>For editable list models, you must also provide an implementation of <a href="qabstractitemmodel.html#setData">setData</a>(), implement the <a href="qabstractitemmodel.html#flags">flags</a>() function so that it returns a value containing <a href="qt.html#ItemFlag-enum">Qt::ItemIsEditable</a>.</p>
<p>Note that QAbstractListModel provides a default implementation of <a href="qabstractitemmodel.html#columnCount">columnCount</a>() that informs views that there is only a single column of items in this model.</p>
<p>Models that provide interfaces to resizable list-like data structures can provide implementations of <a href="qabstractitemmodel.html#insertRows">insertRows</a>() and <a href="qabstractitemmodel.html#removeRows">removeRows</a>(). When implementing these functions, it is important to call the appropriate functions so that all connected views are aware of any changes:</p>
<ul>
<li>An <a href="qabstractitemmodel.html#insertRows">insertRows</a>() implementation must call <a href="qabstractitemmodel.html#beginInsertRows">beginInsertRows</a>() <i>before</i> inserting new rows into the data structure, and it must call <a href="qabstractitemmodel.html#endInsertRows">endInsertRows</a>() <i>immediately afterwards</i>.</li>
<li>A <a href="qabstractitemmodel.html#removeRows">removeRows</a>() implementation must call <a href="qabstractitemmodel.html#beginRemoveRows">beginRemoveRows</a>() <i>before</i> the rows are removed from the data structure, and it must call <a href="qabstractitemmodel.html#endRemoveRows">endRemoveRows</a>() <i>immediately afterwards</i>.</li>
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<p><b>Note:</b> Some general guidelines for subclassing models are available in the <a href="model-view-model-subclassing.html">Model Subclassing Reference</a>.</p>
<p>See also <a href="model-view-model.html">Model Classes</a>, <a href="model-view-model-subclassing.html">Model Subclassing Reference</a>, <a href="qabstractitemview.html">QAbstractItemView</a>, <a href="qabstracttablemodel.html">QAbstractTableModel</a>, and <a href="itemviews-puzzle.html">Item Views Puzzle Example</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn"><a name="QAbstractListModel"></a>QAbstractListModel::QAbstractListModel ( <a href="qobject.html">QObject</a> * <i>parent</i> = 0 )</h3>
<p>Constructs an abstract list model with the given <i>parent</i>.</p>
<a name="//apple_ref/cpp/instm/QAbstractListModel/~QAbstractListModel"></a>
<h3 class="fn"><a name="dtor.QAbstractListModel"></a>QAbstractListModel::~QAbstractListModel ()</h3>
<p>Destroys the abstract list model.</p>
<a name="//apple_ref/cpp/instm/QAbstractListModel/dropMimeData"></a>
<h3 class="fn"><a name="dropMimeData"></a>bool QAbstractListModel::dropMimeData ( const <a href="qmimedata.html">QMimeData</a> * <i>data</i>, <a href="qt.html#DropAction-enum">Qt::DropAction</a> <i>action</i>, int <i>row</i>, int <i>column</i>, const <a href="qmodelindex.html">QModelIndex</a> & <i>parent</i> ) <tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#dropMimeData">QAbstractItemModel::dropMimeData</a>().</p>
<a name="//apple_ref/cpp/instm/QAbstractListModel/index"></a>
<h3 class="fn"><a name="index"></a><a href="qmodelindex.html">QModelIndex</a> QAbstractListModel::index ( int <i>row</i>, int <i>column</i> = 0, const <a href="qmodelindex.html">QModelIndex</a> & <i>parent</i> = QModelIndex() ) const <tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#index">QAbstractItemModel::index</a>().</p>
<p>Returns the index of the data in <i>row</i> and <i>column</i> with <i>parent</i>.</p>
<p>See also <a href="qabstractitemmodel.html#parent">parent</a>().</p>
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