Editing data in QTableModel not changed after editing - qt

Question

I have inherited QAbstractTableModel as described here. I have coded setData as:
bool TableModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
if(role == Qt::EditRole)
{
Data[index.row()][index.column()]= value.toString();
qDebug()<<Data[index.row()][index.column()];//to check entered data passed or not
}
return true;
}
Qt::ItemFlags TableModel::flags(const QModelIndex &index) const
{
return Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsSelectable;
}
and in mainwindow I have connected model and view as:
connect(model,SIGNAL(dataChanged(QModelIndex,QModelIndex)),ui->tableView,SLOT(dataChanged(QModelIndex,QModelIndex)));
but after editing data is not updated in view. I tried with emitting dataChanged signal from setData function but it is not working. What I missed in my code?
data function:
QVariant TableModel::data(const QModelIndex &index, int role) const
{
switch(role)
{
case Qt::DisplayRole:
if(index.column()==0)
{
return index.row()+1;
}
break;
case Qt::DecorationRole:
if(index.column()==1)
{
QColor c;
c.setRgb(0,200,200,200);
return c;
}
break;
case Qt::ToolTipRole:
if(index.column()==2)
{
return "colum 3";
}
break;
case Qt::StatusTipRole:
return "Not editable";
break;
case Qt::FontRole:
{
QFont f;
f.setFamily("Times");
f.setBold(true);
f.setKerning(true);
return f;
}
break;
case Qt::TextAlignmentRole:
{
return Qt::AlignCenter;
}
break;
case Qt::BackgroundRole:
if(index.column()==2)
{
QColor b;
b.setRgb(100,100,250,200);
return b;
}
break;
case Qt::ForegroundRole:
{
QColor b;
b.setRgb(0,100,250,200);
return b;
}
case Qt::CheckStateRole:
if(index.column()==3)
{
if(index.row()==1) return true;
return false;
}
break;
case Qt::InitialSortOrderRole:
return Qt::AscendingOrder;// use not clear
}
return QVariant();
}

Answer 1

There are some notes here that can be taken.
You should emit the dataChanged() signal once the data is updated properly.
You do not seem to use the 2D array variable called "Data" in your data() function that you set up properly in the setData() method. You need to use the (same) variable at both places.
You should not connect the dataChanged() signal to any slot. It will work out automatically for you.