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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
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<head>
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<!-- qhbarmodelmapper.cpp -->
  <title>HBarModelMapper QML Type | Qt Charts 5.9</title>
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<td >Qt 5.9</td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-qmlmodule.html">QML Types</a></td><td >HBarModelMapper QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
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<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">HBarModelMapper QML Type</h1>
<span class="subtitle"></span>
<!-- $$$HBarModelMapper-brief -->
<p>Horizontal model mapper for bar series. <a href="#details">More...</a></p>
<!-- @@@HBarModelMapper -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtCharts 2.2</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Instantiates:</td><td class="memItemRight bottomAlign"> <a href="qml-qtcharts-hbarmodelmapper.html"><a href="qhbarmodelmapper.html">QHBarModelMapper</a></td></tr></table></div><ul>
<li><a href="qml-qtcharts-hbarmodelmapper-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtcharts-hbarmodelmapper.html#columnCount-prop">columnCount</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtcharts-hbarmodelmapper.html#firstBarSetRow-prop">firstBarSetRow</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtcharts-hbarmodelmapper.html#firstColumn-prop">firstColumn</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtcharts-hbarmodelmapper.html#lastBarSetRow-prop">lastBarSetRow</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtcharts-hbarmodelmapper.html#model-prop">model</a></b></b> : SomeModel</li>
<li class="fn"><b><b><a href="qml-qtcharts-hbarmodelmapper.html#series-prop">series</a></b></b> : AbstractBarSeries</li>
</ul>
<!-- $$$HBarModelMapper-description -->
<a name="details"></a>
<h2 id="details">Detailed Description</h2>
<p>The <a href="qml-qtcharts-hbarmodelmapper.html">HBarModelMapper</a> type enables using a data model derived from the QAbstractItemModel class as a data source for a chart. A horizontal model mapper is used to create a connection between a data model and <a href="qml-qtcharts-abstractbarseries.html">AbstractBarSeries</a>, so that each row in the data model defines a bar set and each column maps to a category in a bar series. You need to implement the data model and expose it to QML.</p>
<p>Both model and bar series properties can be used to manipulate the data. The model mapper keeps the bar series and the data model in sync.</p>
<p>The model mapper ensures that all the bar sets in the bar series have equal sizes. Therefore, adding or removing a value from a bar set causes the same change to be made in all the bar sets in the bar series.</p>
<p>The following QML code snippet creates a bar series with three bar sets (assuming the model has at least four rows). Each bar set contains data starting from column 1. The name of a bar set is defined by the row header.</p>
<pre class="cpp">

  BarSeries {
      HBarModelMapper {
          model: myCustomModel <span class="comment">// QAbstractItemModel derived implementation</span>
          firstBarSetRow: <span class="number">1</span>
          lastBarSetRow: <span class="number">3</span>
          firstColumn: <span class="number">1</span>
      }
  }

</pre>
<p><b>See also </b><a href="qml-qtcharts-vbarmodelmapper.html">VBarModelMapper</a>.</p>
<!-- @@@HBarModelMapper -->
<h2>Property Documentation</h2>
<!-- $$$columnCount -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="columnCount-prop">
<td class="tblQmlPropNode"><p>
<a name="columnCount-prop"></a><span class="name">columnCount</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The number of columns of the model that are mapped as the data for the bar series. The default value is -1 (number limited to the number of columns in the model).</p>
</div></div><!-- @@@columnCount -->
<br/>
<!-- $$$firstBarSetRow -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="firstBarSetRow-prop">
<td class="tblQmlPropNode"><p>
<a name="firstBarSetRow-prop"></a><span class="name">firstBarSetRow</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Defines which row of the model is used as the data source for the first bar set. The default value is -1 (invalid mapping).</p>
</div></div><!-- @@@firstBarSetRow -->
<br/>
<!-- $$$firstColumn -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="firstColumn-prop">
<td class="tblQmlPropNode"><p>
<a name="firstColumn-prop"></a><span class="name">firstColumn</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The column of the model that contains the first values of the bar sets in the bar series. The default value is 0.</p>
</div></div><!-- @@@firstColumn -->
<br/>
<!-- $$$lastBarSetRow -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="lastBarSetRow-prop">
<td class="tblQmlPropNode"><p>
<a name="lastBarSetRow-prop"></a><span class="name">lastBarSetRow</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The row of the model that is used as the data source for the last bar set. The default value is -1 (invalid mapping).</p>
</div></div><!-- @@@lastBarSetRow -->
<br/>
<!-- $$$model -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="model-prop">
<td class="tblQmlPropNode"><p>
<a name="model-prop"></a><span class="name">model</span> : <span class="type">SomeModel</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The data model that is used by the mapper. You need to implement the model and expose it to QML.</p>
<p><b>Note: </b>The model has to support adding and removing rows or columns and modifying the data in the cells.</p></div></div><!-- @@@model -->
<br/>
<!-- $$$series -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="series-prop">
<td class="tblQmlPropNode"><p>
<a name="series-prop"></a><span class="name">series</span> : <span class="type"><a href="qml-qtcharts-abstractbarseries.html">AbstractBarSeries</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The bar series that is used by the mapper. All the data in the series is discarded when it is set to the mapper. When the new series is specified, the old series is disconnected (but it preserves its data).</p>
</div></div><!-- @@@series -->
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