mirror of https://github.com/qt/qtgraphs.git
124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
// Copyright (C) 2023 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "variantbardataproxy.h"
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VariantBarDataProxy::VariantBarDataProxy() = default;
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VariantBarDataProxy::~VariantBarDataProxy()
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{
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delete m_dataSet;
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}
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void VariantBarDataProxy::setDataSet(VariantDataSet *newSet)
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{
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if (!m_dataSet.isNull())
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QObject::disconnect(m_dataSet.data(), nullptr, this, nullptr);
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m_dataSet = newSet;
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if (!m_dataSet.isNull()) {
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QObject::connect(m_dataSet.data(),
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&VariantDataSet::itemsAdded,
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this,
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&VariantBarDataProxy::handleItemsAdded);
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QObject::connect(m_dataSet.data(),
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&VariantDataSet::dataCleared,
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this,
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&VariantBarDataProxy::handleDataCleared);
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}
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resolveDataSet();
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}
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VariantDataSet *VariantBarDataProxy::dataSet()
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{
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return m_dataSet.data();
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}
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void VariantBarDataProxy::setMapping(VariantBarDataMapping *mapping)
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{
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if (!m_mapping.isNull()) {
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QObject::disconnect(m_mapping.data(),
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&VariantBarDataMapping::mappingChanged,
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this,
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&VariantBarDataProxy::handleMappingChanged);
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}
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m_mapping = mapping;
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if (!m_mapping.isNull()) {
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QObject::connect(m_mapping.data(),
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&VariantBarDataMapping::mappingChanged,
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this,
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&VariantBarDataProxy::handleMappingChanged);
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}
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resolveDataSet();
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}
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VariantBarDataMapping *VariantBarDataProxy::mapping()
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{
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return m_mapping.data();
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}
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void VariantBarDataProxy::handleItemsAdded(int index, int count)
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{
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Q_UNUSED(index);
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Q_UNUSED(count);
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// Resolve new items
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resolveDataSet();
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}
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void VariantBarDataProxy::handleDataCleared()
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{
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// Data cleared, reset array
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resetArray();
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}
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void VariantBarDataProxy::handleMappingChanged()
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{
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resolveDataSet();
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}
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// Resolve entire dataset into QBarDataArray.
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//! [0]
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void VariantBarDataProxy::resolveDataSet()
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{
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// If we have no data or mapping, or the categories are not defined, simply
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// clear the array
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if (m_dataSet.isNull() || m_mapping.isNull() || !m_mapping->rowCategories().size()
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|| !m_mapping->columnCategories().size()) {
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resetArray();
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return;
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}
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const VariantDataItemList &itemList = m_dataSet->itemList();
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int rowIndex = m_mapping->rowIndex();
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int columnIndex = m_mapping->columnIndex();
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int valueIndex = m_mapping->valueIndex();
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const QStringList &rowList = m_mapping->rowCategories();
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const QStringList &columnList = m_mapping->columnCategories();
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// Sort values into rows and columns
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using ColumnValueMap = QHash<QString, float>;
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QHash<QString, ColumnValueMap> itemValueMap;
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for (const VariantDataItem *item : itemList) {
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itemValueMap[item->at(rowIndex).toString()][item->at(columnIndex).toString()]
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= item->at(valueIndex).toReal();
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}
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// Create a new data array in format the parent class understands
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QBarDataArray newProxyArray;
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for (const QString &rowKey : rowList) {
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QBarDataRow newProxyRow(columnList.size());
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for (qsizetype i = 0; i < columnList.size(); ++i)
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newProxyRow[i].setValue(itemValueMap[rowKey][columnList.at(i)]);
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newProxyArray.append(newProxyRow);
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}
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// Finally, reset the data array in the parent class
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resetArray(newProxyArray);
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}
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//! [0]
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