QTableWidget: repaint of specific cell

sitesv

Hello!
Is it possible to force a repaint of a specific cells?

As I know,

tableWidget->viewport()->update();

repaints all cells.

I have tried to do this:

QRect rrr = ui->tableWidget->visualItemRect(ui->tableWidget->item(myRow, myCol));
ui->tableWidget->update(rrr);

But it is not working.

This needs for color updating in 'paint' event of table delegate.

It works if I update text only.

Thank you!

mrjj

Hi
If you dont set any data/roles on the item, then view dont considered it "dirty"

So how do you set this delegate color ?

for test you can try

    auto model = qobject_cast<QAbstractTableModel *> ( ui->tableWidget->model() );
    if (!model) return;
    QModelIndex idx = model->index(myRow, myCol);
    if (idx.isValid())
        model->dataChanged(idx, idx,   QVector<int>({Qt::DisplayRole, Qt::EditRole}));

with ->update(rrr);

and see if its then repainted.

sitesv

Hi!

@mrjj said in QTableWidget: repaint of specific cell:

So how do you set this delegate color?

In paint section, I do color blinking of specific cells.
The text is not changing.

if(i == 0)
  brush = QBrush(QColor::yellow);
else if(i == 1)
  brush = QBrush(QColor::red);
painter->fillRect(rect, brush);
painter->drawText(rect, Qt::AlignCenter, textCell);

Something like this.

Your code works also without executing 'update' method.
Thank you!

mrjj

@sitesv
Hi
Ahh so its only in the delegate so view doesn't know its changed.
Im not sure the model way is the most compact way, but its how a model woul dinform the view
data has changed so I think it should be ok.

Do note its its what happens if you call item->setData on some role so
that could also be used.