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<title>Qt 4.8: QIdentityProxyModel Class Reference</title>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QIdentityProxyModel Class Reference</h1>
<!-- $$$QIdentityProxyModel-brief -->
<p>The QIdentityProxyModel class proxies its source model unmodified <a href="#details">More...</a></p>
<!-- @@@QIdentityProxyModel -->
<pre class="cpp"> <span class="preprocessor">#include <QIdentityProxyModel></span></pre><p><b>Inherits: </b><a href="qabstractproxymodel.html">QAbstractProxyModel</a>.</p>
<p>This class was introduced in Qt 4.8.</p>
<ul>
<li><a href="qidentityproxymodel-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#QIdentityProxyModel">QIdentityProxyModel</a></b> ( QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#dtor.QIdentityProxyModel">~QIdentityProxyModel</a></b> ()</td></tr>
</table>
<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual int </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#columnCount">columnCount</a></b> ( const QModelIndex & <i>parent</i> = QModelIndex() ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.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 rightAlign topAlign"> virtual QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#index">index</a></b> ( int <i>row</i>, int <i>column</i>, const QModelIndex & <i>parent</i> = QModelIndex() ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#insertColumns">insertColumns</a></b> ( int <i>column</i>, int <i>count</i>, const QModelIndex & <i>parent</i> = QModelIndex() )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#insertRows">insertRows</a></b> ( int <i>row</i>, int <i>count</i>, const QModelIndex & <i>parent</i> = QModelIndex() )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#mapFromSource">mapFromSource</a></b> ( const QModelIndex & <i>sourceIndex</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QItemSelection </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#mapSelectionFromSource">mapSelectionFromSource</a></b> ( const QItemSelection & <i>selection</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QItemSelection </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#mapSelectionToSource">mapSelectionToSource</a></b> ( const QItemSelection & <i>selection</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#mapToSource">mapToSource</a></b> ( const QModelIndex & <i>proxyIndex</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QModelIndexList </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#match">match</a></b> ( const QModelIndex & <i>start</i>, int <i>role</i>, const QVariant & <i>value</i>, int <i>hits</i> = 1, Qt::MatchFlags <i>flags</i> = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap ) ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#parent">parent</a></b> ( const QModelIndex & <i>child</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#removeColumns">removeColumns</a></b> ( int <i>column</i>, int <i>count</i>, const QModelIndex & <i>parent</i> = QModelIndex() )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#removeRows">removeRows</a></b> ( int <i>row</i>, int <i>count</i>, const QModelIndex & <i>parent</i> = QModelIndex() )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual int </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#rowCount">rowCount</a></b> ( const QModelIndex & <i>parent</i> = QModelIndex() ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qidentityproxymodel.html#setSourceModel">setSourceModel</a></b> ( QAbstractItemModel * <i>newSourceModel</i> )</td></tr>
</table>
<ul>
<li class="fn">24 public functions inherited from <a href="qabstractproxymodel.html#public-functions">QAbstractProxyModel</a></li>
<li class="fn">35 public functions inherited from <a href="qabstractitemmodel.html#public-functions">QAbstractItemModel</a></li>
<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">2 public slots inherited from <a href="qabstractitemmodel.html#public-slots">QAbstractItemModel</a></li>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">18 signals inherited from <a href="qabstractitemmodel.html#signals">QAbstractItemModel</a></li>
<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li class="fn">21 protected functions inherited from <a href="qabstractitemmodel.html#protected-functions">QAbstractItemModel</a></li>
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
<li class="fn">1 protected slot inherited from <a href="qabstractitemmodel.html#protected-slots">QAbstractItemModel</a></li>
</ul>
<a name="details"></a>
<!-- $$$QIdentityProxyModel-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QIdentityProxyModel class proxies its source model unmodified</p>
<p>QIdentityProxyModel can be used to forward the structure of a source model exactly, with no sorting, filtering or other transformation. This is similar in concept to an identity matrix where A.I = A.</p>
<p>Because it does no sorting or filtering, this class is most suitable to proxy models which transform the <a href="qabstractproxymodel.html#data">data</a>() of the source model. For example, a proxy model could be created to define the font used, or the background colour, or the tooltip etc. This removes the need to implement all data handling in the same class that creates the structure of the model, and can also be used to create re-usable components.</p>
<p>This also provides a way to change the data in the case where a source model is supplied by a third party which can not be modified.</p>
<pre class="cpp"> <span class="keyword">class</span> DateFormatProxyModel : <span class="keyword">public</span> <span class="type">QIdentityProxyModel</span>
{
<span class="comment">// ...</span>
<span class="type">void</span> setDateFormatString(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>formatString)
{
m_formatString <span class="operator">=</span> formatString;
}
<span class="type"><a href="qvariant.html">QVariant</a></span> data(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index<span class="operator">,</span> <span class="type">int</span> role)
{
<span class="keyword">if</span> (role <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>DisplayRole)
<span class="keyword">return</span> <span class="type">QIdentityProxyModel</span><span class="operator">::</span>data(index<span class="operator">,</span> role);
<span class="keyword">const</span> <span class="type"><a href="qdatetime.html">QDateTime</a></span> dateTime <span class="operator">=</span> sourceModel()<span class="operator">-</span><span class="operator">></span>data(SourceClass<span class="operator">::</span>DateRole)<span class="operator">.</span>toDateTime();
<span class="keyword">return</span> dateTime<span class="operator">.</span>toString(m_formatString);
}
<span class="keyword">private</span>:
<span class="type"><a href="qstring.html">QString</a></span> m_formatString;
};</pre>
</div>
<p><b>See also </b><a href="qabstractproxymodel.html">QAbstractProxyModel</a>, <a href="model-view-programming.html">Model/View Programming</a>, and <a href="qabstractitemmodel.html">QAbstractItemModel</a>.</p>
<!-- @@@QIdentityProxyModel -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QIdentityProxyModel[overload1]$$$QIdentityProxyModelQObject* -->
<h3 class="fn"><a name="QIdentityProxyModel"></a>QIdentityProxyModel::<span class="name">QIdentityProxyModel</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
<p>Constructs an identity model with the given <i>parent</i>.</p>
<!-- @@@QIdentityProxyModel -->
<!-- $$$~QIdentityProxyModel[overload1]$$$~QIdentityProxyModel -->
<h3 class="fn"><a name="dtor.QIdentityProxyModel"></a>QIdentityProxyModel::<span class="name">~QIdentityProxyModel</span> ()</h3>
<p>Destroys this identity model.</p>
<!-- @@@~QIdentityProxyModel -->
<!-- $$$columnCount[overload1]$$$columnCountconstQModelIndex& -->
<h3 class="fn"><a name="columnCount"></a><span class="type">int</span> QIdentityProxyModel::<span class="name">columnCount</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> = QModelIndex() ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#columnCount">QAbstractItemModel::columnCount</a>().</p>
<!-- @@@columnCount -->
<!-- $$$dropMimeData[overload1]$$$dropMimeDataconstQMimeData*Qt::DropActionintintconstQModelIndex& -->
<h3 class="fn"><a name="dropMimeData"></a><span class="type">bool</span> QIdentityProxyModel::<span class="name">dropMimeData</span> ( const <span class="type"><a href="qmimedata.html">QMimeData</a></span> * <i>data</i>, <span class="type"><a href="qt.html#DropAction-enum">Qt::DropAction</a></span> <i>action</i>, <span class="type">int</span> <i>row</i>, <span class="type">int</span> <i>column</i>, const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> )<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#dropMimeData">QAbstractItemModel::dropMimeData</a>().</p>
<!-- @@@dropMimeData -->
<!-- $$$index[overload1]$$$indexintintconstQModelIndex& -->
<h3 class="fn"><a name="index"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QIdentityProxyModel::<span class="name">index</span> ( <span class="type">int</span> <i>row</i>, <span class="type">int</span> <i>column</i>, const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> = QModelIndex() ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#index">QAbstractItemModel::index</a>().</p>
<!-- @@@index -->
<!-- $$$insertColumns[overload1]$$$insertColumnsintintconstQModelIndex& -->
<h3 class="fn"><a name="insertColumns"></a><span class="type">bool</span> QIdentityProxyModel::<span class="name">insertColumns</span> ( <span class="type">int</span> <i>column</i>, <span class="type">int</span> <i>count</i>, const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> = QModelIndex() )<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#insertColumns">QAbstractItemModel::insertColumns</a>().</p>
<!-- @@@insertColumns -->
<!-- $$$insertRows[overload1]$$$insertRowsintintconstQModelIndex& -->
<h3 class="fn"><a name="insertRows"></a><span class="type">bool</span> QIdentityProxyModel::<span class="name">insertRows</span> ( <span class="type">int</span> <i>row</i>, <span class="type">int</span> <i>count</i>, const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> = QModelIndex() )<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#insertRows">QAbstractItemModel::insertRows</a>().</p>
<!-- @@@insertRows -->
<!-- $$$mapFromSource[overload1]$$$mapFromSourceconstQModelIndex& -->
<h3 class="fn"><a name="mapFromSource"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QIdentityProxyModel::<span class="name">mapFromSource</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>sourceIndex</i> ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractproxymodel.html#mapFromSource">QAbstractProxyModel::mapFromSource</a>().</p>
<!-- @@@mapFromSource -->
<!-- $$$mapSelectionFromSource[overload1]$$$mapSelectionFromSourceconstQItemSelection& -->
<h3 class="fn"><a name="mapSelectionFromSource"></a><span class="type"><a href="qitemselection.html">QItemSelection</a></span> QIdentityProxyModel::<span class="name">mapSelectionFromSource</span> ( const <span class="type"><a href="qitemselection.html">QItemSelection</a></span> & <i>selection</i> ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractproxymodel.html#mapSelectionFromSource">QAbstractProxyModel::mapSelectionFromSource</a>().</p>
<!-- @@@mapSelectionFromSource -->
<!-- $$$mapSelectionToSource[overload1]$$$mapSelectionToSourceconstQItemSelection& -->
<h3 class="fn"><a name="mapSelectionToSource"></a><span class="type"><a href="qitemselection.html">QItemSelection</a></span> QIdentityProxyModel::<span class="name">mapSelectionToSource</span> ( const <span class="type"><a href="qitemselection.html">QItemSelection</a></span> & <i>selection</i> ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractproxymodel.html#mapSelectionToSource">QAbstractProxyModel::mapSelectionToSource</a>().</p>
<!-- @@@mapSelectionToSource -->
<!-- $$$mapToSource[overload1]$$$mapToSourceconstQModelIndex& -->
<h3 class="fn"><a name="mapToSource"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QIdentityProxyModel::<span class="name">mapToSource</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>proxyIndex</i> ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractproxymodel.html#mapToSource">QAbstractProxyModel::mapToSource</a>().</p>
<!-- @@@mapToSource -->
<!-- $$$match[overload1]$$$matchconstQModelIndex&intconstQVariant&intQt::MatchFlags -->
<h3 class="fn"><a name="match"></a><span class="type"><a href="qmodelindex.html#QModelIndexList-typedef">QModelIndexList</a></span> QIdentityProxyModel::<span class="name">match</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>start</i>, <span class="type">int</span> <i>role</i>, const <span class="type"><a href="qvariant.html">QVariant</a></span> & <i>value</i>, <span class="type">int</span> <i>hits</i> = 1, <span class="type"><a href="qt.html#MatchFlag-enum">Qt::MatchFlags</a></span> <i>flags</i> = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap ) ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#match">QAbstractItemModel::match</a>().</p>
<!-- @@@match -->
<!-- $$$parent[overload1]$$$parentconstQModelIndex& -->
<h3 class="fn"><a name="parent"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QIdentityProxyModel::<span class="name">parent</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>child</i> ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#parent">QAbstractItemModel::parent</a>().</p>
<!-- @@@parent -->
<!-- $$$removeColumns[overload1]$$$removeColumnsintintconstQModelIndex& -->
<h3 class="fn"><a name="removeColumns"></a><span class="type">bool</span> QIdentityProxyModel::<span class="name">removeColumns</span> ( <span class="type">int</span> <i>column</i>, <span class="type">int</span> <i>count</i>, const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> = QModelIndex() )<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#removeColumns">QAbstractItemModel::removeColumns</a>().</p>
<!-- @@@removeColumns -->
<!-- $$$removeRows[overload1]$$$removeRowsintintconstQModelIndex& -->
<h3 class="fn"><a name="removeRows"></a><span class="type">bool</span> QIdentityProxyModel::<span class="name">removeRows</span> ( <span class="type">int</span> <i>row</i>, <span class="type">int</span> <i>count</i>, const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> = QModelIndex() )<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#removeRows">QAbstractItemModel::removeRows</a>().</p>
<!-- @@@removeRows -->
<!-- $$$rowCount[overload1]$$$rowCountconstQModelIndex& -->
<h3 class="fn"><a name="rowCount"></a><span class="type">int</span> QIdentityProxyModel::<span class="name">rowCount</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>parent</i> = QModelIndex() ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractitemmodel.html#rowCount">QAbstractItemModel::rowCount</a>().</p>
<!-- @@@rowCount -->
<!-- $$$setSourceModel[overload1]$$$setSourceModelQAbstractItemModel* -->
<h3 class="fn"><a name="setSourceModel"></a><span class="type">void</span> QIdentityProxyModel::<span class="name">setSourceModel</span> ( <span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> * <i>newSourceModel</i> )<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractproxymodel.html#setSourceModel">QAbstractProxyModel::setSourceModel</a>().</p>
<!-- @@@setSourceModel -->
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