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<td >Qt 5.12</td><td ><a href="qtdatavisualization-index.html">Qt Data Visualization</a></td><td ><a href="qtdatavisualization-customproxy-example.html">Custom Proxy Example</a></td><td >variantbardataproxy.cpp Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">variantbardataproxy.cpp Example File</h1>
<span class="subtitle">customproxy/variantbardataproxy.cpp</span>
<!-- $$$customproxy/variantbardataproxy.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Data Visualization module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "variantbardataproxy.h"</span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="type"><a href="qtdatavisualization-qmlmodule.html">QtDataVisualization</a></span>;
VariantBarDataProxy<span class="operator">::</span>VariantBarDataProxy() :
<span class="type"><a href="qbardataproxy.html">QBarDataProxy</a></span>()
{
}
VariantBarDataProxy<span class="operator">::</span>VariantBarDataProxy(VariantDataSet <span class="operator">*</span>newSet<span class="operator">,</span>
VariantBarDataMapping <span class="operator">*</span>mapping) :
<span class="type"><a href="qbardataproxy.html">QBarDataProxy</a></span>()
{
setDataSet(newSet);
setMapping(mapping);
}
VariantBarDataProxy<span class="operator">::</span><span class="operator">~</span>VariantBarDataProxy()
{
<span class="keyword">delete</span> m_dataSet;
}
<span class="type">void</span> VariantBarDataProxy<span class="operator">::</span>setDataSet(VariantDataSet <span class="operator">*</span>newSet)
{
<span class="keyword">if</span> (<span class="operator">!</span>m_dataSet<span class="operator">.</span>isNull())
<span class="type">QObject</span><span class="operator">::</span>disconnect(m_dataSet<span class="operator">.</span>data()<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="number">0</span>);
m_dataSet <span class="operator">=</span> newSet;
<span class="keyword">if</span> (<span class="operator">!</span>m_dataSet<span class="operator">.</span>isNull()) {
<span class="type">QObject</span><span class="operator">::</span>connect(m_dataSet<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span>VariantDataSet<span class="operator">::</span>itemsAdded<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
<span class="operator">&</span>VariantBarDataProxy<span class="operator">::</span>handleItemsAdded);
<span class="type">QObject</span><span class="operator">::</span>connect(m_dataSet<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span>VariantDataSet<span class="operator">::</span>dataCleared<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
<span class="operator">&</span>VariantBarDataProxy<span class="operator">::</span>handleDataCleared);
}
resolveDataSet();
}
VariantDataSet <span class="operator">*</span>VariantBarDataProxy<span class="operator">::</span>dataSet()
{
<span class="keyword">return</span> m_dataSet<span class="operator">.</span>data();
}
<span class="type">void</span> VariantBarDataProxy<span class="operator">::</span>setMapping(VariantBarDataMapping <span class="operator">*</span>mapping)
{
<span class="keyword">if</span> (<span class="operator">!</span>m_mapping<span class="operator">.</span>isNull())
<span class="type">QObject</span><span class="operator">::</span>disconnect(m_mapping<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span>VariantBarDataMapping<span class="operator">::</span>mappingChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
<span class="operator">&</span>VariantBarDataProxy<span class="operator">::</span>handleMappingChanged);
m_mapping <span class="operator">=</span> mapping;
<span class="keyword">if</span> (<span class="operator">!</span>m_mapping<span class="operator">.</span>isNull())
<span class="type">QObject</span><span class="operator">::</span>connect(m_mapping<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span>VariantBarDataMapping<span class="operator">::</span>mappingChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
<span class="operator">&</span>VariantBarDataProxy<span class="operator">::</span>handleMappingChanged);
resolveDataSet();
}
VariantBarDataMapping <span class="operator">*</span>VariantBarDataProxy<span class="operator">::</span>mapping()
{
<span class="keyword">return</span> m_mapping<span class="operator">.</span>data();
}
<span class="type">void</span> VariantBarDataProxy<span class="operator">::</span>handleItemsAdded(<span class="type">int</span> index<span class="operator">,</span> <span class="type">int</span> count)
{
Q_UNUSED(index)
Q_UNUSED(count)
<span class="comment">// Resolve new items</span>
resolveDataSet();
}
<span class="type">void</span> VariantBarDataProxy<span class="operator">::</span>handleDataCleared()
{
<span class="comment">// Data cleared, reset array</span>
resetArray(<span class="number">0</span>);
}
<span class="type">void</span> VariantBarDataProxy<span class="operator">::</span>handleMappingChanged()
{
resolveDataSet();
}
<span class="comment">// Resolve entire dataset into QBarDataArray.</span>
<span class="type">void</span> VariantBarDataProxy<span class="operator">::</span>resolveDataSet()
{
<span class="comment">// If we have no data or mapping, or the categories are not defined, simply clear the array</span>
<span class="keyword">if</span> (m_dataSet<span class="operator">.</span>isNull() <span class="operator">|</span><span class="operator">|</span> m_mapping<span class="operator">.</span>isNull() <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>m_mapping<span class="operator">-</span><span class="operator">></span>rowCategories()<span class="operator">.</span>size()
<span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>m_mapping<span class="operator">-</span><span class="operator">></span>columnCategories()<span class="operator">.</span>size()) {
resetArray(<span class="number">0</span>);
<span class="keyword">return</span>;
}
<span class="keyword">const</span> VariantDataItemList <span class="operator">&</span>itemList <span class="operator">=</span> m_dataSet<span class="operator">-</span><span class="operator">></span>itemList();
<span class="type">int</span> rowIndex <span class="operator">=</span> m_mapping<span class="operator">-</span><span class="operator">></span>rowIndex();
<span class="type">int</span> columnIndex <span class="operator">=</span> m_mapping<span class="operator">-</span><span class="operator">></span>columnIndex();
<span class="type">int</span> valueIndex <span class="operator">=</span> m_mapping<span class="operator">-</span><span class="operator">></span>valueIndex();
<span class="keyword">const</span> <span class="type">QStringList</span> <span class="operator">&</span>rowList <span class="operator">=</span> m_mapping<span class="operator">-</span><span class="operator">></span>rowCategories();
<span class="keyword">const</span> <span class="type">QStringList</span> <span class="operator">&</span>columnList <span class="operator">=</span> m_mapping<span class="operator">-</span><span class="operator">></span>columnCategories();
<span class="comment">// Sort values into rows and columns</span>
<span class="keyword">typedef</span> <span class="type">QHash</span><span class="operator"><</span><span class="type">QString</span><span class="operator">,</span> <span class="type">float</span><span class="operator">></span> ColumnValueMap;
<span class="type">QHash</span> <span class="operator"><</span><span class="type">QString</span><span class="operator">,</span> ColumnValueMap<span class="operator">></span> itemValueMap;
foreach (<span class="keyword">const</span> VariantDataItem <span class="operator">*</span>item<span class="operator">,</span> itemList) {
itemValueMap<span class="operator">[</span>item<span class="operator">-</span><span class="operator">></span>at(rowIndex)<span class="operator">.</span>toString()<span class="operator">]</span><span class="operator">[</span>item<span class="operator">-</span><span class="operator">></span>at(columnIndex)<span class="operator">.</span>toString()<span class="operator">]</span>
<span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>at(valueIndex)<span class="operator">.</span>toReal();
}
<span class="comment">// Create a new data array in format the parent class understands</span>
<span class="type"><a href="qbardataproxy.html#QBarDataArray-typedef">QBarDataArray</a></span> <span class="operator">*</span>newProxyArray <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbardataproxy.html#QBarDataArray-typedef">QBarDataArray</a></span>;
foreach (<span class="type">QString</span> rowKey<span class="operator">,</span> rowList) {
<span class="type"><a href="qbardataproxy.html#QBarDataRow-typedef">QBarDataRow</a></span> <span class="operator">*</span>newProxyRow <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbardataproxy.html#QBarDataRow-typedef">QBarDataRow</a></span>(columnList<span class="operator">.</span>size());
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> columnList<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>)
(<span class="operator">*</span>newProxyRow)<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>setValue(itemValueMap<span class="operator">[</span>rowKey<span class="operator">]</span><span class="operator">[</span>columnList<span class="operator">.</span>at(i)<span class="operator">]</span>);
newProxyArray<span class="operator">-</span><span class="operator">></span>append(newProxyRow);
}
<span class="comment">// Finally, reset the data array in the parent class</span>
resetArray(newProxyArray);
}
</pre>
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<!-- @@@customproxy/variantbardataproxy.cpp -->
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<acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
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Mageia
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7
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armv7hl
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media
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core-updates
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by-pkgid
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845e36bb3ecce380666d628d88446962
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238
