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