Hi all,

I already read a few threads on this forum dealing with similar issues but didn't provide "the" solution.

I built my own QAbstractTableModel class which fills a QTableView with data from a .csv file. The file is used for logging purposes and stores its (new) data every 10 minutes. The data is shown inside a QTableView but needs to be updated manually (button or closing and reopening the QDialog). What I want to achieve is that the view is automatically updated whenever new data is written to the .csv file.

The code snippets of my TableModel looks as follows:
Qt Code: 
  1. int QCsvTableModel::rowCount(const QModelIndex &parent) const
  2. {
  3.     Q_UNUSED(parent);
  4.     return csvMatrix.rowCount();
  5. }
  6.  
  7. int QCsvTableModel::columnCount(const QModelIndex &parent) const
  8. {
  9.     Q_UNUSED(parent);
  10.     return csvMatrix.columnCount();
  11. }
  12.  
  13. QVariant QCsvTableModel::data(const QModelIndex &index, int role) const
  14. {
  15.     if (index.isValid())
  16.         if (role == Qt::DisplayRole || role == Qt::EditRole)
  17.             return csvMatrix.at(index.row(), index.column());
  18.     return QVariant();
  19. }
  20.  
  21. bool QCsvTableModel::setData(const QModelIndex &index, const QVariant &value, int role)
  22. {
  23.     if (index.isValid() && role == Qt::EditRole) {
  24.         csvMatrix.setValue(index.row(), index.column(), value.toString());
  25.  
  26.         emit dataChanged(index,index);     // No difference if dataChanged is emitted or not
  27.  
  28.         return true;
  29.     }
  30.  
  31.     return false;
  32. }
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MainWindow source:
Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent),
  3.     ui(new Ui::MainWindow)
  4. {
  5.     ui->setupUi(this);
  6.  
  7.     QString fileName = ":/value.csv";
  8.  
  9.     if (!fileName.isEmpty()) {
  10.         QCsvTableModel *model = new QCsvTableModel(this);
  11.  
  12.         QString extension = QFileInfo(QFile(fileName)).completeSuffix();
  13.  
  14.         if (extension.toLower() == "csv")     // known file extension
  15.             model->loadFromFile(fileName);
  16.  
  17.         ui->tableView->setModel(model);
  18.     } // if fileName ..
  19.  
  20.     connect(ui->tableView->model(), SIGNAL(dataChanged(const QModelIndex&, const QModelIndex&)), this, SLOT(onModelsDataChanged(const QModelIndex&, const QModelIndex&)));
  21.     //connect(model, SIGNAL(dataChanged(const QModelIndex&, const QModelIndex&)), this, SLOT(onModelsDataChanged(const QModelIndex&, const QModelIndex&)));                         // Didn't work either ..
  22. }
  23.  
  24. void MainWindow::onModelsDataChanged(const  QModelIndex  &topLeft,  const  QModelIndex  &bottomRight)
  25. {
  26.     Q_UNUSED(topLeft);
  27.     Q_UNUSED(bottomRight);
  28.  
  29.     qDebug() << "The data has changed." << endl;
  30. }
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But the dataChanged() signal isn't fired at all and "The data has changed." never shows up.

What am I missing? Any help is appreciated!

Michael