<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qhpiemodelmapper.cpp --> <title>HPieModelMapper QML Type | Qt Charts 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <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 >HPieModelMapper QML Type</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <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">HPieModelMapper QML Type</h1> <span class="subtitle"></span> <!-- $$$HPieModelMapper-brief --> <p>Horizontal model mapper for pie series. <a href="#details">More...</a></p> <!-- @@@HPieModelMapper --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtCharts 2.2</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Instantiates:</td><td class="memItemRight bottomAlign"> <a href="qml-qtcharts-hpiemodelmapper.html"><a href="qhpiemodelmapper.html">QHPieModelMapper</a></td></tr></table></div><ul> <li><a href="qml-qtcharts-hpiemodelmapper-members.html">List of all members, including inherited members</a></li> </ul> <a name="properties"></a> <h2 id="properties">Properties</h2> <ul> <li class="fn"><b><b><a href="qml-qtcharts-hpiemodelmapper.html#columnCount-prop">columnCount</a></b></b> : int</li> <li class="fn"><b><b><a href="qml-qtcharts-hpiemodelmapper.html#firstColumn-prop">firstColumn</a></b></b> : int</li> <li class="fn"><b><b><a href="qml-qtcharts-hpiemodelmapper.html#labelsRow-prop">labelsRow</a></b></b> : int</li> <li class="fn"><b><b><a href="qml-qtcharts-hpiemodelmapper.html#model-prop">model</a></b></b> : SomeModel</li> <li class="fn"><b><b><a href="qml-qtcharts-hpiemodelmapper.html#series-prop">series</a></b></b> : PieSeries</li> <li class="fn"><b><b><a href="qml-qtcharts-hpiemodelmapper.html#valuesRow-prop">valuesRow</a></b></b> : int</li> </ul> <!-- $$$HPieModelMapper-description --> <a name="details"></a> <h2 id="details">Detailed Description</h2> <p>Model mappers enable 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-pieseries.html">PieSeries</a>, so that each column in the data model defines a pie slice and each row maps to the label or the value of the pie slice.</p> <p>Both model and pie series properties can be used to manipulate the data. The model mapper keeps the pie series and the data model in sync.</p> <p>The following QML example creates a pie series with four slices (assuming the model has at least five columns). Each slice gets a label from row 1 and a value from row 2.</p> <pre class="cpp"> HPieModelMapper { series: pieSeries model: customModel labelsRow: <span class="number">1</span> valuesRow: <span class="number">2</span> firstColumn: <span class="number">1</span> columnCount: <span class="number">4</span> } </pre> <!-- @@@HPieModelMapper --> <h2>Property Documentation</h2> <!-- $$$columnCount --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="columnCount-prop"> <td class="tblQmlPropNode"><p> <a name="columnCount-prop"></a><span class="name">columnCount</span> : <span class="type">int</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>The number of columns of the model that are mapped as the data for the pie series. The default value is -1 (number limited by the number of columns in the model).</p> </div></div><!-- @@@columnCount --> <br/> <!-- $$$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 slice value. The default value is 0.</p> </div></div><!-- @@@firstColumn --> <br/> <!-- $$$labelsRow --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="labelsRow-prop"> <td class="tblQmlPropNode"><p> <a name="labelsRow-prop"></a><span class="name">labelsRow</span> : <span class="type">int</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>The row of the model that is kept in sync with the labels of the pie's slices. The default value is -1 (invalid mapping).</p> </div></div><!-- @@@labelsRow --> <br/> <!-- $$$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 QAbstractItemModel based 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/> <!-- $$$series --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="series-prop"> <td class="tblQmlPropNode"><p> <a name="series-prop"></a><span class="name">series</span> : <span class="type"><a href="qml-qtcharts-pieseries.html">PieSeries</a></span></p></td></tr> </table></div> </div><div class="qmldoc"><p>The <a href="qml-qtcharts-pieseries.html">PieSeries</a> object that is used by the mapper. If you define the mapper element as a child for a <a href="qml-qtcharts-pieseries.html">PieSeries</a>, leave this property undefined. All the data in the series is discarded when it is set to the mapper. When a new series is specified, the old series is disconnected (but it preserves its data).</p> </div></div><!-- @@@series --> <br/> <!-- $$$valuesRow --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="valuesRow-prop"> <td class="tblQmlPropNode"><p> <a name="valuesRow-prop"></a><span class="name">valuesRow</span> : <span class="type">int</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>The row of the model that is kept in sync with the values of the pie's slices. The default value is -1 (invalid mapping).</p> </div></div><!-- @@@valuesRow --> <br/> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>