Qt 5.9 | Qt Charts | Model Data Example | customtablemodel.cpp Example File

Qt 5.9.9 Reference Documentation

# customtablemodel.cpp Example File

modeldata/customtablemodel.cpp

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      ** Contact: https://www.qt.io/licensing/
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      #include "customtablemodel.h"
      #include <QtCore/QVector>
      #include <QtCore/QTime>
      #include <QtCore/QRect>
      #include <QtGui/QColor>

      CustomTableModel::CustomTableModel(QObject *parent) :
          QAbstractTableModel(parent)
      {
          qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));

          m_columnCount = 4;
          m_rowCount = 15;

          // m_data
          for (int i = 0; i < m_rowCount; i++) {
              QVector<qreal>* dataVec = new QVector<qreal>(m_columnCount);
              for (int k = 0; k < dataVec->size(); k++) {
                  if (k % 2 == 0)
                      dataVec->replace(k, i * 50 + qrand() % 20);
                  else
                      dataVec->replace(k, qrand() % 100);
              }
              m_data.append(dataVec);
          }
      }

      int CustomTableModel::rowCount(const QModelIndex &parent) const
      {
          Q_UNUSED(parent)
          return m_data.count();
      }

      int CustomTableModel::columnCount(const QModelIndex &parent) const
      {
          Q_UNUSED(parent)
          return m_columnCount;
      }

      QVariant CustomTableModel::headerData(int section, Qt::Orientation orientation, int role) const
      {
          if (role != Qt::DisplayRole)
              return QVariant();

          if (orientation == Qt::Horizontal) {
              if (section % 2 == 0)
                  return "x";
              else
                  return "y";
          } else {
              return QString("%1").arg(section + 1);
          }
      }

      QVariant CustomTableModel::data(const QModelIndex &index, int role) const
      {
          if (role == Qt::DisplayRole) {
              return m_data[index.row()]->at(index.column());
          } else if (role == Qt::EditRole) {
              return m_data[index.row()]->at(index.column());
          } else if (role == Qt::BackgroundRole) {
              for (const QRect &rect : m_mapping) {
                  if (rect.contains(index.column(), index.row()))
                      return QColor(m_mapping.key(rect));
              }
              // cell not mapped return white color
              return QColor(Qt::white);
          }
          return QVariant();
      }

      bool CustomTableModel::setData(const QModelIndex &index, const QVariant &value, int role)
      {
          if (index.isValid() && role == Qt::EditRole) {
              m_data[index.row()]->replace(index.column(), value.toDouble());
              emit dataChanged(index, index);
              return true;
          }
          return false;
      }

      Qt::ItemFlags CustomTableModel::flags(const QModelIndex &index) const
      {
          return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;
      }

      void CustomTableModel::addMapping(QString color, QRect area)
      {
          m_mapping.insertMulti(color, area);
      }