TableView Header problem

[BrianE]

Qt 5.6. All working OK except for one small thing. In the headerData function I have:

if (role == Qt::BackgroundRole) return QBrush(Qt::lightGray);

but it doesn't happen. Everything else works fine. Anyone know why?

[SGaist]

Hi,

What do you mean by it doesn't happen ? The role is never Qt::BackgroundRole ? Or your brush has no effect ?

[BrianE]

I quote from QT 5.6 QHeaderView Class, section on appearance:

"Not all ItemDataRoles will have an effect on a QHeaderView. If you need to draw other roles, you can subclass QHeaderView and reimplement paintEvent(). QHeaderView respects the following item data roles: TextAlignmentRole, DisplayRole, FontRole, DecorationRole, ForegroundRole, and BackgroundRole."

So, BackgroundRole should give background colour to the headerview but mine stay white. I can change the font and I can change the foreground colour (text colour).

[SGaist]

What OS are you running ?

[BrianE]

Windows 10

[SGaist]

I don't have such a machine at hand. Can you test that again using the fusion style ? You have an example here

[BrianE]

Did that. It works! What is going on? Before I scream and pull what little hair I have left out could you offer a quick explanation. Other stuff looks different, too.

[SGaist]

Setting the background role will modify the QPalette used for the painting and from the QPalette documentation, styles using native theme engines may not use the palette for all drawings.

[BrianE]

OK. Thanks for that. Sanity has returned and I'll now go away and investigate palettes and styles and stuff.