variantbardataproxy.cpp Example File
customproxy/variantbardataproxy.cpp
#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(m_dataSet.data(), 0, this, 0);
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)
resolveDataSet();
}
void VariantBarDataProxy::handleDataCleared()
{
resetArray(0);
}
void VariantBarDataProxy::handleMappingChanged()
{
resolveDataSet();
}
void VariantBarDataProxy::resolveDataSet()
{
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();
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();
}
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][columnList.at(i)]);
newProxyArray->append(newProxyRow);
}
resetArray(newProxyArray);
}