variantbardataproxy.cpp Example File

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#include "variantbardataproxy.h" using namespace QtDataVisualization; VariantBarDataProxy::VariantBarDataProxy() : QBarDataProxy() { } VariantBarDataProxy::VariantBarDataProxy(VariantDataSet *newSet, VariantBarDataMapping *mapping) : QBarDataProxy() { setDataSet(newSet); setMapping(mapping); } VariantBarDataProxy::~VariantBarDataProxy() { delete m_dataSet; } void VariantBarDataProxy::setDataSet(VariantDataSet *newSet) { if (!m_dataSet.isNull()) QObject::disconnect(, 0, this, 0); m_dataSet = newSet; if (!m_dataSet.isNull()) { QObject::connect(, &VariantDataSet::itemsAdded, this, &VariantBarDataProxy::handleItemsAdded); QObject::connect(, &VariantDataSet::dataCleared, this, &VariantBarDataProxy::handleDataCleared); } resolveDataSet(); } VariantDataSet *VariantBarDataProxy::dataSet() { return; } void VariantBarDataProxy::setMapping(VariantBarDataMapping *mapping) { if (!m_mapping.isNull()) QObject::disconnect(, &VariantBarDataMapping::mappingChanged, this, &VariantBarDataProxy::handleMappingChanged); m_mapping = mapping; if (!m_mapping.isNull()) QObject::connect(, &VariantBarDataMapping::mappingChanged, this, &VariantBarDataProxy::handleMappingChanged); resolveDataSet(); } VariantBarDataMapping *VariantBarDataProxy::mapping() { return; } 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(0); } void VariantBarDataProxy::handleMappingChanged() { resolveDataSet(); } // Resolve entire dataset into QBarDataArray. 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(0); 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 typedef QHash<QString, float> ColumnValueMap; QHash <QString, ColumnValueMap> itemValueMap; foreach (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 QBarDataArray *newProxyArray = new QBarDataArray; foreach (QString rowKey, rowList) { QBarDataRow *newProxyRow = new QBarDataRow(columnList.size()); for (int i = 0; i < columnList.size(); i++) (*newProxyRow)[i].setValue(itemValueMap[rowKey][]); newProxyArray->append(newProxyRow); } // Finally, reset the data array in the parent class resetArray(newProxyArray); }

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