headerView of the QTableView not shown

[momesana]

Hi,
I have a QTableModel with 5 columns, but when I return labels for more than 4 columns the horizontal headerview isn't shown at all. Here is a simple application to highlight the problem. Save it as main.cpp and compile it using qmake -project && qmake && make

#include <QtGui>
 
class TableModel : public QAbstractTableModel
{
  Q_OBJECT
  public: 
    TableModel(QObject* parent = 0) : QAbstractTableModel(parent)
    {
    }
  protected:
     protected:
    int rowCount(const QModelIndex & parent = QModelIndex()) const
    {
      return 20;
    }
 
    int columnCount(const QModelIndex & parent = QModelIndex()) const
    {
      return 5;
    }
 
    QVariant data(const QModelIndex & index, int role = Qt::DisplayRole) const
    {
      if (index.isValid() && role == Qt::DisplayRole) {
    return QString("index: %1,%2").arg(index.row()).arg(index.column());
      }
      return QVariant();
    }
 
    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const
    {
      if (orientation == Qt::Horizontal) {
    switch(section) {
      case 0: return QString("one");
      case 1: return QString("two");
      case 2: return QString("three");
      case 3: return QString("four");
      case 4: return QString("five");
    }
      }
      return QVariant();
    }
};
 
int main(int argc, char** argv)
{
  QApplication app(argc, argv);
  TableModel* model = new TableModel();
  QTableView* view = new QTableView;
  view->setModel(model);
  view->show();
  return app.exec();
}
#include "main.moc"

#include <QtGui>

class TableModel : public QAbstractTableModel
{
  Q_OBJECT
  public: 
    TableModel(QObject* parent = 0) : QAbstractTableModel(parent)
    {
    }
  protected:
     protected:
    int rowCount(const QModelIndex & parent = QModelIndex()) const
    {
      return 20;
    }
    
    int columnCount(const QModelIndex & parent = QModelIndex()) const
    {
      return 5;
    }
    
    QVariant data(const QModelIndex & index, int role = Qt::DisplayRole) const
    {
      if (index.isValid() && role == Qt::DisplayRole) {
    return QString("index: %1,%2").arg(index.row()).arg(index.column());
      }
      return QVariant();
    }
    
    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const
    {
      if (orientation == Qt::Horizontal) {
    switch(section) {
      case 0: return QString("one");
      case 1: return QString("two");
      case 2: return QString("three");
      case 3: return QString("four");
      case 4: return QString("five");
    }
      }
      return QVariant();
    }
};

int main(int argc, char** argv)
{
  QApplication app(argc, argv);
  TableModel* model = new TableModel();
  QTableView* view = new QTableView;
  view->setModel(model);
  view->show();
  return app.exec();
}
#include "main.moc"

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Any Ideas?

Thanx in advance
momesana

[tituslup]

The problem is, you have to emit the signal headerDataChanged(...) if you re implement this function. Just before returning the QVariant() will do just fine.

http://doc.trolltech.com/4.1/qabstra...derDataChanged

[momesana]

Thanks but that's not the solution. The reason for the issue was that I didn't check for the correct role (Qt:isplayRole). Checking for the role solves the issue.

Cheers
momesana