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<td >Qt 5.12</td><td ><a href="qtdatavisualization-index.html">Qt Data Visualization</a></td><td ><a href="qtdatavisualization-qmlmodule.html">QML Types</a></td><td >ItemModelBarDataProxy QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtdatavisualization-index.html">Qt Data Visualization | Commercial or GPLv3</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
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<h1 class="title">ItemModelBarDataProxy QML Type</h1>
<span class="subtitle"></span>
<!-- $$$ItemModelBarDataProxy-brief -->
<p>Proxy class for presenting data in item models with <a href="qml-qtdatavisualization-bars3d.html">Bars3D</a>. <a href="#details">More...</a></p>
<!-- @@@ItemModelBarDataProxy -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtDataVisualization 1.2</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign">  QtDataVisualization 1.0</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Instantiates:</td><td class="memItemRight bottomAlign"> <a href="qml-qtdatavisualization-itemmodelbardataproxy.html"><a href="qitemmodelbardataproxy.html">QItemModelBarDataProxy</a></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtdatavisualization-bardataproxy.html">BarDataProxy</a></p>
</td></tr></table></div><ul>
<li><a href="qml-qtdatavisualization-itemmodelbardataproxy-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#autoColumnCategories-prop">autoColumnCategories</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#autoRowCategories-prop">autoRowCategories</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnCategories-prop">columnCategories</a></b></b> : list&lt;String&gt;</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRole-prop">columnRole</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRolePattern-prop">columnRolePattern</a></b></b> : regExp</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRoleReplace-prop">columnRoleReplace</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#itemModel-prop">itemModel</a></b></b> : model</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#multiMatchBehavior-prop">multiMatchBehavior</a></b></b> : ItemModelBarDataProxy.MultiMatchBehavior</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRole-prop">rotationRole</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRolePattern-prop">rotationRolePattern</a></b></b> : regExp</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRoleReplace-prop">rotationRoleReplace</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowCategories-prop">rowCategories</a></b></b> : list&lt;String&gt;</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRole-prop">rowRole</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRolePattern-prop">rowRolePattern</a></b></b> : regExp</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRoleReplace-prop">rowRoleReplace</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#useModelCategories-prop">useModelCategories</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRole-prop">valueRole</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRolePattern-prop">valueRolePattern</a></b></b> : regExp</li>
<li class="fn"><b><b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRoleReplace-prop">valueRoleReplace</a></b></b> : string</li>
</ul>
<!-- $$$ItemModelBarDataProxy-description -->
<a name="details"></a>
<h2 id="details">Detailed Description</h2>
<p>This type allows you to use AbstractItemModel derived models as a data source for <a href="qml-qtdatavisualization-bars3d.html">Bars3D</a>.</p>
<p>Data is resolved asynchronously whenever the mapping or the model changes. <a href="qbardataproxy.html#arrayReset">QBarDataProxy::arrayReset()</a> is emitted when the data has been resolved.</p>
<p>For <a href="qml-qtdatavisualization-itemmodelbardataproxy.html">ItemModelBarDataProxy</a> enums, see <a href="qitemmodelbardataproxy.html#MultiMatchBehavior-enum">QItemModelBarDataProxy::MultiMatchBehavior</a>.</p>
<p>For more details, see <a href="qitemmodelbardataproxy.html">QItemModelBarDataProxy</a> documentation.</p>
<p>Usage example:</p>
<pre class="cpp">

  ItemModelBarDataProxy {
      itemModel: model <span class="comment">// E.g. a list model defined elsewhere containing yearly expenses data.</span>
      <span class="comment">// Mapping model roles to bar series rows, columns, and values.</span>
      rowRole: <span class="string">&quot;year&quot;</span>
      columnRole: <span class="string">&quot;city&quot;</span>
      valueRole: <span class="string">&quot;expenses&quot;</span>
      rowCategories: <span class="operator">[</span><span class="string">&quot;2010&quot;</span><span class="operator">,</span> <span class="string">&quot;2011&quot;</span><span class="operator">,</span> <span class="string">&quot;2012&quot;</span><span class="operator">,</span> <span class="string">&quot;2013&quot;</span><span class="operator">]</span>
      columnCategories: <span class="operator">[</span><span class="string">&quot;Oulu&quot;</span><span class="operator">,</span> <span class="string">&quot;Rauma&quot;</span><span class="operator">,</span> <span class="string">&quot;Helsinki&quot;</span><span class="operator">,</span> <span class="string">&quot;Tampere&quot;</span><span class="operator">]</span>
  }

</pre>
<p><b>See also </b><a href="qml-qtdatavisualization-bardataproxy.html">BarDataProxy</a> and <a href="qtdatavisualization-data-handling.html">Qt Data Visualization Data Handling</a>.</p>
<!-- @@@ItemModelBarDataProxy -->
<h2>Property Documentation</h2>
<!-- $$$autoColumnCategories -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="autoColumnCategories-prop">
<td class="tblQmlPropNode"><p>
<a name="autoColumnCategories-prop"></a><span class="name">autoColumnCategories</span> : <span class="type">bool</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>When set to <code>true</code>, the mapping ignores any explicitly set column categories and overwrites them with automatically generated ones whenever the data from model is resolved. Defaults to <code>true</code>.</p>
</div></div><!-- @@@autoColumnCategories -->
<br/>
<!-- $$$autoRowCategories -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="autoRowCategories-prop">
<td class="tblQmlPropNode"><p>
<a name="autoRowCategories-prop"></a><span class="name">autoRowCategories</span> : <span class="type">bool</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>When set to <code>true</code>, the mapping ignores any explicitly set row categories and overwrites them with automatically generated ones whenever the data from the model is resolved. Defaults to <code>true</code>.</p>
</div></div><!-- @@@autoRowCategories -->
<br/>
<!-- $$$columnCategories -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="columnCategories-prop">
<td class="tblQmlPropNode"><p>
<a name="columnCategories-prop"></a><span class="name">columnCategories</span> : <span class="type">list</span>&lt;<span class="type">String</span>&gt;</p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The column categories of the mapping. Only items with column role values that are found in this list are included when the data is resolved. The columns are ordered in the same order as they are in this list.</p>
</div></div><!-- @@@columnCategories -->
<br/>
<!-- $$$columnRole -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="columnRole-prop">
<td class="tblQmlPropNode"><p>
<a name="columnRole-prop"></a><span class="name">columnRole</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The item model role to map into column category.</p>
</div></div><!-- @@@columnRole -->
<br/>
<!-- $$$columnRolePattern -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="columnRolePattern-prop">
<td class="tblQmlPropNode"><p>
<a name="columnRolePattern-prop"></a><span class="name">columnRolePattern</span> : <span class="type">regExp</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>When set, a search and replace is done on the value mapped by column role before it is used as a column category. This property specifies the regular expression to find the portion of the mapped value to replace and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRoleReplace-prop">columnRoleReplace</a> property contains the replacement string. This is useful for example in parsing row and column categories from a single timestamp field in the item model.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRole-prop">columnRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRoleReplace-prop">columnRoleReplace</a>.</p>
</div></div><!-- @@@columnRolePattern -->
<br/>
<!-- $$$columnRoleReplace -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="columnRoleReplace-prop">
<td class="tblQmlPropNode"><p>
<a name="columnRoleReplace-prop"></a><span class="name">columnRoleReplace</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property defines the replace content to be used in conjunction with <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRolePattern-prop">columnRolePattern</a>. Defaults to empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegExp &amp;rx, const QString &amp;after) function documentation.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRole-prop">columnRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#columnRolePattern-prop">columnRolePattern</a>.</p>
</div></div><!-- @@@columnRoleReplace -->
<br/>
<!-- $$$itemModel -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="itemModel-prop">
<td class="tblQmlPropNode"><p>
<a name="itemModel-prop"></a><span class="name">itemModel</span> : <span class="type">model</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The item model.</p>
</div></div><!-- @@@itemModel -->
<br/>
<!-- $$$multiMatchBehavior -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="multiMatchBehavior-prop">
<td class="tblQmlPropNode"><p>
<a name="multiMatchBehavior-prop"></a><span class="name">multiMatchBehavior</span> : <span class="type"><a href="qml-qtdatavisualization-itemmodelbardataproxy.html">ItemModelBarDataProxy</a></span>.<span class="type">MultiMatchBehavior</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Defines how multiple matches for each row/column combination are handled. Defaults to <a href="qitemmodelbardataproxy.html#MultiMatchBehavior-enum">ItemModelBarDataProxy.MMBLast</a>. The chosen behavior affects both bar value and rotation.</p>
<p>For example, you might have an item model with timestamped data taken at irregular intervals and you want to visualize total value of data items on each day with a bar graph. This can be done by specifying row and column categories so that each bar represents a day, and setting multiMatchBehavior to <a href="qitemmodelbardataproxy.html#MultiMatchBehavior-enum">ItemModelBarDataProxy.MMBCumulative</a>.</p>
</div></div><!-- @@@multiMatchBehavior -->
<br/>
<!-- $$$rotationRole -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rotationRole-prop">
<td class="tblQmlPropNode"><p>
<a name="rotationRole-prop"></a><span class="name">rotationRole</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The item model role to map into bar rotation angle.</p>
</div></div><!-- @@@rotationRole -->
<br/>
<!-- $$$rotationRolePattern -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rotationRolePattern-prop">
<td class="tblQmlPropNode"><p>
<a name="rotationRolePattern-prop"></a><span class="name">rotationRolePattern</span> : <span class="type">regExp</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>When set, a search and replace is done on the value mapped by rotation role before it is used as a bar rotation angle. This property specifies the regular expression to find the portion of the mapped value to replace and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRoleReplace-prop">rotationRoleReplace</a> property contains the replacement string.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRole-prop">rotationRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRoleReplace-prop">rotationRoleReplace</a>.</p>
</div></div><!-- @@@rotationRolePattern -->
<br/>
<!-- $$$rotationRoleReplace -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rotationRoleReplace-prop">
<td class="tblQmlPropNode"><p>
<a name="rotationRoleReplace-prop"></a><span class="name">rotationRoleReplace</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property defines the replace content to be used in conjunction with <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRolePattern-prop">rotationRolePattern</a>. Defaults to empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegExp &amp;rx, const QString &amp;after) function documentation.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRole-prop">rotationRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rotationRolePattern-prop">rotationRolePattern</a>.</p>
</div></div><!-- @@@rotationRoleReplace -->
<br/>
<!-- $$$rowCategories -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rowCategories-prop">
<td class="tblQmlPropNode"><p>
<a name="rowCategories-prop"></a><span class="name">rowCategories</span> : <span class="type">list</span>&lt;<span class="type">String</span>&gt;</p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The row categories of the mapping. Only items with row role values that are found in this list are included when the data is resolved. The rows are ordered in the same order as they are in this list.</p>
</div></div><!-- @@@rowCategories -->
<br/>
<!-- $$$rowRole -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rowRole-prop">
<td class="tblQmlPropNode"><p>
<a name="rowRole-prop"></a><span class="name">rowRole</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The item model role to map into row category.</p>
</div></div><!-- @@@rowRole -->
<br/>
<!-- $$$rowRolePattern -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rowRolePattern-prop">
<td class="tblQmlPropNode"><p>
<a name="rowRolePattern-prop"></a><span class="name">rowRolePattern</span> : <span class="type">regExp</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>When set, a search and replace is done on the value mapped by row role before it is used as a row category. This property specifies the regular expression to find the portion of the mapped value to replace and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRoleReplace-prop">rowRoleReplace</a> property contains the replacement string. This is useful for example in parsing row and column categories from a single timestamp field in the item model.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRole-prop">rowRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRoleReplace-prop">rowRoleReplace</a>.</p>
</div></div><!-- @@@rowRolePattern -->
<br/>
<!-- $$$rowRoleReplace -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rowRoleReplace-prop">
<td class="tblQmlPropNode"><p>
<a name="rowRoleReplace-prop"></a><span class="name">rowRoleReplace</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property defines the replace content to be used in conjunction with <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRolePattern-prop">rowRolePattern</a>. Defaults to empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegExp &amp;rx, const QString &amp;after) function documentation.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRole-prop">rowRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#rowRolePattern-prop">rowRolePattern</a>.</p>
</div></div><!-- @@@rowRoleReplace -->
<br/>
<!-- $$$useModelCategories -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="useModelCategories-prop">
<td class="tblQmlPropNode"><p>
<a name="useModelCategories-prop"></a><span class="name">useModelCategories</span> : <span class="type">bool</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>When set to <code>true</code>, the mapping ignores row and column roles and categories, and uses the rows and columns from the model instead. Row and column headers are used for row and column labels. Defaults to <code>false</code>.</p>
</div></div><!-- @@@useModelCategories -->
<br/>
<!-- $$$valueRole -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="valueRole-prop">
<td class="tblQmlPropNode"><p>
<a name="valueRole-prop"></a><span class="name">valueRole</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The item model role to map into bar value.</p>
</div></div><!-- @@@valueRole -->
<br/>
<!-- $$$valueRolePattern -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="valueRolePattern-prop">
<td class="tblQmlPropNode"><p>
<a name="valueRolePattern-prop"></a><span class="name">valueRolePattern</span> : <span class="type">regExp</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>When set, a search and replace is done on the value mapped by value role before it is used as a bar value. This property specifies the regular expression to find the portion of the mapped value to replace and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRoleReplace-prop">valueRoleReplace</a> property contains the replacement string.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRole-prop">valueRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRoleReplace-prop">valueRoleReplace</a>.</p>
</div></div><!-- @@@valueRolePattern -->
<br/>
<!-- $$$valueRoleReplace -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="valueRoleReplace-prop">
<td class="tblQmlPropNode"><p>
<a name="valueRoleReplace-prop"></a><span class="name">valueRoleReplace</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property defines the replace content to be used in conjunction with <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRolePattern-prop">valueRolePattern</a>. Defaults to empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegExp &amp;rx, const QString &amp;after) function documentation.</p>
<p><b>See also </b><a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRole-prop">valueRole</a> and <a href="qml-qtdatavisualization-itemmodelbardataproxy.html#valueRolePattern-prop">valueRolePattern</a>.</p>
</div></div><!-- @@@valueRoleReplace -->
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