[Interest] Problems when updating view/delegate

[norulez at me.com]

Hi,

I tried to overload the setData() function as followed, but the behavior is the same which means that the view/delegate doesn't get updated:

bool ret = QStandardItemModel::setData(index, value, role);
emit dataChanged(this->index(0, 0), this->index(rowCount(), columnCount()));
return ret;

I also tried:
.) to update only the changed row => same effect:
emit dataChanged(this->index(index.row(), 0), this->index(index.row(), columnCount()));

.) calling a QTimer::singleShot(500) in the setData() => same effect
.) deactivate the QSortFilterProxyModel and use only the QStandardItemModel => same effect
.) various combinations from those points => same effect

Do I need to do something special for the delegate and/or for the view?

Best Regards


Am 03.02.2012 um 21:01 schrieb Bo Thorsen <bo at fioniasoftware.dk>:

> The way I would do this is to make a custom role for the background and 
> use that to paint the background in the delegate.
> 
> You have to emit dataChanged() for the cells where the background should 
> be updated as well as the column2 cells for the delegates to be notified 
> about the change.
> 
> Bo.
> 
> Den 03-02-2012 11:47, norulez at me.com skrev:
>> Hello @all,
>> 
>> lets say I have a model with 5 columns and 3 rows.
>> 
>> The delegate should set the background color for the individual rows  depending on which value is in column 2.
>> 
>> Now my main problem is that when I change the value of column 2, then only the background of column 2 is changed.
>> 
>> How can I update the view so that all columns are updated?
>> 
>> mytableview->repaint is too expensive.
>> 
>> Thanks in advance
>> 
>> Best Regards
>> NoRulez
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> 
> 
> Bo Thorsen,
> Fionia Software.
> 
> -- 
> 
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