call data() function after QHeaderview Sort

[norobro]

Try passing the QModelIndex of the cells that you want to highlight instead of the row numbers and then in MyProxyModel::data() map the index to your source model with:

QModelIndex QSortFilterProxyModel::mapToSource ( const QModelIndex & proxyIndex ) const

QModelIndex QSortFilterProxyModel::mapToSource ( const QModelIndex & proxyIndex ) const

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[poporacer]

Thanks for your help. I don't totally understand. Here is what I have so far:

QModelIndex testIndexSlow;
QModelIndex testIndexFast;
 
//get fastest and slowest times and save row
 
int numRows =proxy->rowCount();
 
for (int r=0; r<numRows; r++ )
{
 
  if (ui->printView->isRowHidden(r))
    continue;
  //currentRunTime=proxy->mapToSource(index);
  currentRunTime = proxy->index(r,32).data(Qt::DisplayRole).toFloat();
  if (currentRunTime < fastRunTime)
  {
    fastRunTime = currentRunTime;
    rowFast = r;
  }
  if (currentRunTime > slowRunTime)
  {
    slowRunTime = currentRunTime;
    rowSlow = r;
  }
  totalRows++;
  totalTime += currentRunTime;
}
testIndexSlow =proxy->index(rowSlow,32,QModelIndex());
testIndexFast =proxy->index(rowFast,32,QModelIndex());
emit sendRows (testIndexSlow, testIndexFast);

QModelIndex testIndexSlow;
QModelIndex testIndexFast;

//get fastest and slowest times and save row
 
int numRows =proxy->rowCount();

for (int r=0; r<numRows; r++ )
{

  if (ui->printView->isRowHidden(r))
    continue;
  //currentRunTime=proxy->mapToSource(index);
  currentRunTime = proxy->index(r,32).data(Qt::DisplayRole).toFloat();
  if (currentRunTime < fastRunTime)
  {
    fastRunTime = currentRunTime;
    rowFast = r;
  }
  if (currentRunTime > slowRunTime)
  {
    slowRunTime = currentRunTime;
    rowSlow = r;
  }
  totalRows++;
  totalTime += currentRunTime;
}
testIndexSlow =proxy->index(rowSlow,32,QModelIndex());
testIndexFast =proxy->index(rowFast,32,QModelIndex());
emit sendRows (testIndexSlow, testIndexFast);

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I think that is what you suggested for the first part.

But in the MyProxyModel::data() I put in the function declaration:

QModelIndex QSortFilterProxyModel::mapToSource ( const QModelIndex & proxyIndex ) const;

QModelIndex QSortFilterProxyModel::mapToSource ( const QModelIndex & proxyIndex ) const;

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and I get the error
invalid use of qualified-name 'QSortFilterProxyModel::mapToSource
I tried to make a QModelIndex variable but it didn't work.
What am I missing?

[norobro]

I believe the statement in data() should look like this:

QModelIndex sourceIndex = mapToSource(index);

QModelIndex sourceIndex = mapToSource(index);

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Then compare sourceIndex with testIndexSlow and testIndexFast.

EDIT: After further review it looks like your original code passing the row numbers should work. You only needed to add the mapToSource() statement above and compare.

[poporacer]

Well, I still don't quite have it, but we are close! I added the

QModelIndex sourceIndex = mapToSource(index);

QModelIndex sourceIndex = mapToSource(index);

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to the data() function and the correct cell is highlighted. But when the sort is conducted the highlight is on the same cell and not on the correct data. I figured that the sourceIndex needed to be used for the data() and when I used the following code the highlight now is linked to the data. BUT the wrong data is highlighted. Here is the code:

QVariant MyProxyModel::data ( const QModelIndex & index, int role ) const
{ 
QModelIndex sourceIndex = mapToSource(index);
 
if (!sourceIndex.isValid())
    return QVariant(); 
if ( sourceIndex.row() == m_fastRow && sourceIndex.column()== 32 && role == Qt::BackgroundRole )
    { 
 
    return QVariant( Qt::yellow );
    } 
    else if ( sourceIndex.row() == m_slowRow && sourceIndex.column()== 32 && role == Qt::BackgroundRole )
    {
       return QVariant( Qt::red );
    }
    else
    { 
    return QSortFilterProxyModel::data( index, role );
    } 
}

QVariant MyProxyModel::data ( const QModelIndex & index, int role ) const
{ 
QModelIndex sourceIndex = mapToSource(index);

if (!sourceIndex.isValid())
    return QVariant(); 
if ( sourceIndex.row() == m_fastRow && sourceIndex.column()== 32 && role == Qt::BackgroundRole )
    { 

    return QVariant( Qt::yellow );
    } 
    else if ( sourceIndex.row() == m_slowRow && sourceIndex.column()== 32 && role == Qt::BackgroundRole )
    {
       return QVariant( Qt::red );
    }
    else
    { 
    return QSortFilterProxyModel::data( index, role );
    } 
}

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I think that somehow I need to mapToSource or mapFromSource in my code that figures out the correct row. In debugging the code it appears that one model is the reverse order of the other. Here is the code I use for getting the row.

printModel= new QSqlRelationalTableModel (this);
    printModel-> setEditStrategy(QSqlTableModel::OnRowChange);
    printModel-> setTable (mTableName);
    printModel-> setRelation (2, QSqlRelation("rider", "id", "LName"));
    printModel->select();
    proxy = new MyProxyModel(this);
    proxy->setSourceModel(printModel);
    ui->printView->setModel(proxy);
    ui->printView->setSelectionMode(QAbstractItemView::SingleSelection);
    ui->printView->setSelectionBehavior(QAbstractItemView::SelectRows);
    printModel->setFilter(mFilterString);
    printModel->select();
 
    int numRows =proxy->rowCount();
 
for (int r=0; r<numRows; r++ )
{
 
 currentRunTime = proxy->index(r,32).data(Qt::DisplayRole).toFloat();
 
  if (currentRunTime < fastRunTime)
  {
    fastRunTime = currentRunTime;
    rowFast = r;
  }
  if (currentRunTime > slowRunTime)
  {
    slowRunTime = currentRunTime;
    rowSlow = r;
  }
  }
emit sendRows (rowSlow, rowFast);

printModel= new QSqlRelationalTableModel (this);
    printModel-> setEditStrategy(QSqlTableModel::OnRowChange);
    printModel-> setTable (mTableName);
    printModel-> setRelation (2, QSqlRelation("rider", "id", "LName"));
    printModel->select();
    proxy = new MyProxyModel(this);
    proxy->setSourceModel(printModel);
    ui->printView->setModel(proxy);
    ui->printView->setSelectionMode(QAbstractItemView::SingleSelection);
    ui->printView->setSelectionBehavior(QAbstractItemView::SelectRows);
    printModel->setFilter(mFilterString);
    printModel->select();

    int numRows =proxy->rowCount();

for (int r=0; r<numRows; r++ )
{

 currentRunTime = proxy->index(r,32).data(Qt::DisplayRole).toFloat();

  if (currentRunTime < fastRunTime)
  {
    fastRunTime = currentRunTime;
    rowFast = r;
  }
  if (currentRunTime > slowRunTime)
  {
    slowRunTime = currentRunTime;
    rowSlow = r;
  }
  }
emit sendRows (rowSlow, rowFast);

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Any ideas?

[norobro]

I tried your code on a small db (no relation, no filter) and it works fine.

Try moving your setFilter() statement like so:

printModel-> setRelation (2, QSqlRelation("rider", "id", "LName"));
    printModel->setFilter(mFilterString);  // move to here
    printModel->select();
    proxy = new MyProxyModel(this);
    proxy->setSourceModel(printModel);
    ui->printView->setModel(proxy);
    ui->printView->setSelectionMode(QAbstractItemView::SingleSelection);
    ui->printView->setSelectionBehavior(QAbstractItemView::SelectRows);
//    printModel->setFilter(mFilterString);
//    printModel->select();

printModel-> setRelation (2, QSqlRelation("rider", "id", "LName"));
    printModel->setFilter(mFilterString);  // move to here
    printModel->select();
    proxy = new MyProxyModel(this);
    proxy->setSourceModel(printModel);
    ui->printView->setModel(proxy);
    ui->printView->setSelectionMode(QAbstractItemView::SingleSelection);
    ui->printView->setSelectionBehavior(QAbstractItemView::SelectRows);
//    printModel->setFilter(mFilterString);
//    printModel->select();

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[poporacer]

That worked! Thanks a bunch!