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Windows11Style: Disable shadow for QComboBox inside QGraphicsProxyWidget

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A QGraphicsEffect is not rendered inside a QGraphicsView so we must not
set it on a QComboBoxPrivateContainer. We have to do some checks for it
when a stylesheet is set as polish() is then called before the proxy
widget is set on the QComboBoxPrivateContainer. But luckily QComboBox
has the proxy widget already set so do the check there.

Pick-to: 6.9 6.8
Fixes: QTBUG-135340
Task-number: QTBUG-128916
Task-number: QTBUG-128329
Change-Id: I2426701f3aa44a2eb14b66846628dbb9cd16dc9f
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
This commit is contained in:
Christian Ehrlicher 2025-04-01 21:49:40 +02:00
parent 92a65fdac6
commit 847c0bf076
1 changed files with 11 additions and 7 deletions
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18
src/plugins/styles/modernwindows/qwindows11style.cpp
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@ -2211,13 +2211,17 @@ void QWindows11Style::polish(QWidget* widget)
auto pal = widget->palette();
pal.setColor(widget->backgroundRole(), Qt::transparent);
widget->setPalette(pal);
if (!isScrollBar
&& widget->graphicsProxyWidget() == nullptr) { // for menus and combobox containers...
QGraphicsDropShadowEffect* dropshadow = new QGraphicsDropShadowEffect(widget);
dropshadow->setBlurRadius(3);
dropshadow->setXOffset(3);
dropshadow->setYOffset(3);
widget->setGraphicsEffect(dropshadow);
if (!isScrollBar) {
bool inGraphicsView = widget->graphicsProxyWidget() != nullptr;
if (!inGraphicsView && comboBoxContainer && comboBoxContainer->parentWidget())
inGraphicsView = comboBoxContainer->parentWidget()->graphicsProxyWidget() != nullptr;
if (!inGraphicsView) { // for menus and combobox containers...
QGraphicsDropShadowEffect *dropshadow = new QGraphicsDropShadowEffect(widget);
dropshadow->setBlurRadius(3);
dropshadow->setXOffset(3);
dropshadow->setYOffset(3);
widget->setGraphicsEffect(dropshadow);
}
}
} else if (QComboBox* cb = qobject_cast<QComboBox*>(widget)) {
if (cb->isEditable()) {