How to change background color of a cell in a treeview at runtime please?

[hpgh]

What I use is QSqlQueryModel + QTreeView.
I am planning to change background color of a cell in a treeview by double clicking the cell, the following are the codes, but it won't work.
Please tell me what is wrong with them . Thanks a lot.

@
void MainWindow::on_tableViewMain_doubleClicked(QModelIndex index)
{
processTableViewMainDoubleClicked(index);
ui->tableViewMain->model->setData(index,QVariant(QColor(Qt::red)),Qt::BackgroundRole);
ui->tableViewMain->update(index);
}
@

EDIT: inserted @-tags for code, Gerolf. Please use that in future for code formatting

[giesbert]

I don't know whether a QSqlQueryModel allows storing of such data.
You could achieve it by using a proxy model.

[hpgh]

Problem solved by Implementing a Custom Delegate Inherits QStyledItemDelegate.

[stukdev]

Can you show the solution?

[quote author="hpgh" date="1296664055"]Problem solved by Implementing a Custom Delegate Inherits QStyledItemDelegate.
[/quote]

[hpgh]

What I want to do is that the whole row will change the background color when I double click a cell in the row.
So I wrote my own paint method in MyItemDelegate class inherits QStyledItemDelegate:

@
void MyItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
int row = index.row();
if(row == myrow)
{
painter->fillRect(option.rect, mycolor);
QStyledItemDelegate::paint(painter,option,index);
}
else
{
QStyledItemDelegate::paint(painter,option,index);
}
}

and the following is response function of double-click event.

void MainWindow::processTableViewMainDoubleClicked(QModelIndex &index)
{
...
...
// Mark the line when double clicked.
ui->tableViewMain->setItemDelegate(new MyItemDelegate(row, QColor(Qt::yellow)));
...
}

@

[Guest]

hi hpgh, can you use the @ tag to make the code more readable. thanks

[hpgh]

[quote author="chetankjain" date="1297153689"]hi hpgh, can you use the @ tag to make the code more readable. thanks[/quote]

I will pay attention next time.