Creating a QAbstractItemModel for QTreeView

[hbill]

hi

MyDirModel:: MyDirModel(QObject *parent)
     : QDirModel(parent)
{
    removeColumn(QDirModel::columnCount() - 1);
}
 
 
MyDirModel::~MyDirModel()
{
}
 
 
int MyDirModel::columnCount(const QModelIndex& parent) const
{
   return QDirModel::columnCount(parent) + 2  ;
}
 
QVariant MyDirModel::data(const QModelIndex & index, int role) const
{
    if( role==Qt::DisplayRole )
    {
        if( index.column()==QDirModel::columnCount() )
            return fileInfo( index ).owner();
        else 
            if( index.column()==QDirModel::columnCount() +1 )
                return fileInfo( index ).group();
    }
return QDirModel::data(index, role);
}

MyDirModel:: MyDirModel(QObject *parent)
     : QDirModel(parent)
{
    removeColumn(QDirModel::columnCount() - 1);
}


MyDirModel::~MyDirModel()
{
}


int MyDirModel::columnCount(const QModelIndex& parent) const
{
   return QDirModel::columnCount(parent) + 2  ;
}

QVariant MyDirModel::data(const QModelIndex & index, int role) const
{
    if( role==Qt::DisplayRole )
    {
        if( index.column()==QDirModel::columnCount() )
            return fileInfo( index ).owner();
        else 
            if( index.column()==QDirModel::columnCount() +1 )
                return fileInfo( index ).group();
    }
return QDirModel::data(index, role);
}

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the column "last modified" was not removed and the new columns are empty

[jpn]

QDirModel does not implement QAbstractItemModel::removeColums() so you can't use it. Either hide it from the view or make the subclass return alternative data for that particular column. Start with checking out if anything shows up in those columns when you return a fixed test string. After that, continue with investigating whether the QFileInfo returned by fileInfo() is ok.

[hbill]

hi

QVariant MyDirModel::data(const QModelIndex & index, int role) const
      {
    QMessageBox msgBox;
    //msgBox.exec();//ok
          if( role==Qt::DisplayRole )
          {
        //msgBox.exec();//ok
              if( index.column()==QDirModel::columnCount() )//problem
        {
        //msgBox.exec();//not ok
                  return fileInfo( index ).owner();
        }
              else
                  if( index.column()==QDirModel::columnCount() +1 )//problem
                      return fileInfo( index ).group();
            else
                if( index.column()==QDirModel::columnCount() -1 )
                {
                    //msgBox.exec();//ok
                    return fileInfo( index ).owner();//ok
                }
          }
      return QDirModel::data(index, role);
      }

QVariant MyDirModel::data(const QModelIndex & index, int role) const
      {
    QMessageBox msgBox;
    //msgBox.exec();//ok
          if( role==Qt::DisplayRole )
          {
        //msgBox.exec();//ok
              if( index.column()==QDirModel::columnCount() )//problem
        {
        //msgBox.exec();//not ok
                  return fileInfo( index ).owner();
        }
              else
                  if( index.column()==QDirModel::columnCount() +1 )//problem
                      return fileInfo( index ).group();
            else
                if( index.column()==QDirModel::columnCount() -1 )
                {
                    //msgBox.exec();//ok
                    return fileInfo( index ).owner();//ok
                }
          }
      return QDirModel::data(index, role);
      }

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i have a problem with the new columns !!!

[jpn]

i have a problem with the new columns !!!

Could you be a bit more verbose about the problem, please?

[wysota]

Could you be a bit more verbose about the problem, please?

Yeah... a more verbose version is "they are not working!"

Sorry, couldn't resist myself...

[hbill]

the test

if( index.column()==id_column )

if( index.column()==id_column )

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is virified if id_column <QDirModel::columnCount()
but no if id_column >=QDirModel::columnCount()

[wysota]

Could you check if your columnCount() method is called at all?

[crimsonphire]

Did you ever find a solution to the column data not being added?

[killerwookie99]

Your problem may have been similar to mine. What version of Qt are you using. I upgraded from 4.3.2 to 4.4.1 on solaris, and my problems went away.