How can I change QTableView's color of the area that doesn't have cells on it?

[Edico]

How can be changed QTableView's color of the area that doesn't have cells on it?

Thanks in advance!

[octal]

Could you be more precise ? What do you want to change exactly ? The header's color ?

[andre]

Set the background color. You can do that either with setting the palette, or by using a style sheet.

[goetz]

This snippet does the trick:

@
QTableWidget tw;
QPalette p = tw.palette();
p.setColor(QPalette::Base, QColor("yellow"));
tw.setPalette(p);
@

Or set the respective color in the palette property in Qt Designer, if you're using .ui files.

[Edico]

Volker, I've tried like that but it also does changing the cells color.

[giesbert]

[quote author="Edico" date="1314534038"]Volker, I've tried like that but it also does changing the cells color.[/quote]

That's correct. The background color is behind the cells and behind the widget :-(
What you could do is use a style sheet and set the background color of the table there and another background color for the cells.

[Edico]

I didn't made it even with style sheets. I've reached doing something like that:

@
QTableView {
alternate-background-color: blue;
background: red
}

QTableView::item:selected {
background-color: green
}

QTableView::item {
background-color: white
}
@

All items are white with no alternate row colors.

[andre]

Are you using some kind of special, non-standard style?

[Edico]

Andre, no, I don't think so. With the above code I see al items white and the area that doesn't have cells on is red, but I see no alternating row colors (one white - one blue).

[sigrid]

I can reproduce this problem here and it looks like a bug. When setting the background-color for the item in addition to the background -color and the alternate-background-color for the table, then the alternate-background-color will be ignored. I suggest you report this issue in "Jira":https://bugreports.qt.nokia.com//secure/Dashboard.jspa.

[giesbert]

if you set the color for cells in general and also alternate background color, then the cell wins, that makes sense. and where else will you see the alternate background color?

[Edico]

Is there a way to have a color for the outside area of the cells, another for cells and other color for alternate background color?

[giesbert]

you will not have alternate color if you set cells color via style sheet. alternate color is a cell color.

[Edico]

So, the only way is to subclass QSqlRelationalTableModel (the model I use to access data)? That looks like a big pain.

[giesbert]

if you want alternate row colors and a different cell background then empty background? I think yes. Or use a proxy model instead of a subclass, that's much less work.

[Edico]

I can't figure how to use a proxy model for this job.

[giesbert]

if you use a proxy model, the proxy models data method is called for each data query instead of the methods of the original model. This then calls the original (source) model. So you can do everything you want there, like changing backroundColor via the Qt::BackgroundRole. IMHO ProxyModels are easier then derived SQL models ;-)

[Edico]

Gerolf, this mean that I must subclass QSortFilterProxyModel and reimplement data() method?

[octal]

Yes, you can create your custom ProxyModel by sublcassing QSortFilterProxyModel and reimplementing the data() method. From there, you can do everything you want, like Gerolf said.

Finally, you just set the sourceModel of your ProxyModel, and it should work :)

[andre]

Yes. If you were using 4.8, I would suggest you use -QIdentityModel- [[doc:QIdentityProxyModel]] as your base class, but if you are still on 4.7, use [[doc:QSortFilterProxyModel]] instead. You only need to reimplement the data() method. In that method, you only need to implement the case where the Qt::BackgroundRole is requested. Based on the row number (odd or even), you can return a different color. For all other cases, you get the parent QModelIndex by calling mapToSource() on the model index, and then return the result of calling the data() method on the source model with the same role and the model index you just mapped.