QSS and drawComplexControl()

LightFractal

Hi!
I have a QDialog containing a QTableView, along with a custom delegate showing a QComboBox for enum types.
When the row is not selected, I still want the QComboBox to be visible (I would like to avoid using QTableView::openPersistentEditor()).
To do so, the custom delegate forwards the paint event to the following method:
@
void CustomEnum::paint(QPainter *painter, const QStyleOptionViewItem &option) const
{
painter->save();

QStyleOptionComboBox comboBoxOption;
comboBoxOption.rect = option.rect;
comboBoxOption.state = option.state;
comboBoxOption.state |= QStyle::State_Enabled;
comboBoxOption.editable = false;
comboBoxOption.currentText = enumInfo.valueToKey(curValue);

// The cast is successful, and srcWidget is the QTableView
QWidget *srcWidget = qobject_cast<QWidget *>(option.styleObject);
QStyle *style = srcWidget ? srcWidget->style() : QApplication::style();

// However, the QSS is ignored here (while srcWidget->styleSheet() correctly
// returns the style I've set in Qt Designer)
style->drawComplexControl(QStyle::CC_ComboBox, &comboBoxOption, painter, srcWidget);
style->drawControl(QStyle::CE_ComboBoxLabel, &comboBoxOption, painter, srcWidget);

painter->restore();
}
@

The problem is that I've styled the combo box control using QSS, but drawComplexControl() seems to ignore that, despite using the QTableView's style. Here's a screenshot:

[img]http://i.imgur.com/IC62DBz.jpg[/img]

Is it possible for drawComplexControl() to consider the style sheet?

Thanks

SGaist

Hi,

AFAIK, widget using style sheet doesn't use the application style but the QStyleSheetStyle which is a private class.
You can use use it but beware that it can change and even be removed without notice

Hope it helps

LightFractal

Shouldn't the style variabile in my code point to a QStyleSheetStyle already?
After all, it's the QTableView which has the stylesheet property set (from Qt Designer).

EDIT: Indeed the following code
@
const char *clsName = style->metaObject()->className();
@

yields "QStyleSheetStyle"! Why is the styling being ignored?

SGaist

What does srcWidget->style() return ?

LightFractal

[quote author="SGaist" date="1391463873"]What does srcWidget->style() return ?[/quote]

srcWidget points to the QTableView, which has the styleSheet property set via Qt Designer.
srcWidget->style() returns a QStyle instance and srcWidget->style()->metaObject()->className() yields "QStyleSheetStyle".

However, I have some news: I found that drawComplexControl actually works, but only if two conditions are met, namely:

You have to call drawComplexControl() from a QStyleSheetStyle (and that's ok, srcWidget->style() is actually a QStyleSheetStyle).
You have to pass an instance of the same widget type you want to draw as the last parameter of drawComplexControl(). In my example, I pass srcWidget which is a QTableView. Apparently, Qt doesn't like that. In order to work, I need to pass a QComboBox instance!
With this snippet, the code works:

@
QWidget *srcWidget = qobject_cast<QWidget *>(option.styleObject);
// Important! We need to set the combobox as child of an already layouted widget, otherwise the code will not work
QComboBox *cbo = new QComboBox(srcWidget);
QStyle *style = srcWidget->style();
style->drawComplexControl(QStyle::CC_ComboBox, &comboBoxOption, painter, cbo);
style->drawControl(QStyle::CE_ComboBoxLabel, &comboBoxOption, painter, cbo);
delete cbo;
@

Of course, this solution is horrible beyond words (repeatedly creating a widget inside a paint event!).
So it seems that my problem is shifted towards providing a suitable instance to drawComplexControl().

Any ideas would be appreciated.

SGaist

Why not get the combo box from your widget then ?