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Update translucency correctly in QtWidgets.

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Fixes breakage introduced by cdc436ebe6 .

Top level widgets with translucent backgrounds were invisible since
opacity was set to 0.

Task-number: QTBUG-28531
Change-Id: I97058ac1b971422f3bda3a5ffed479ec55bfe5d4
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
This commit is contained in:
Friedemann Kleint 2013-01-09 12:54:08 +01:00 committed by The Qt Project
parent eebf42cc0d
commit fd372f3866
1 changed files with 9 additions and 2 deletions
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11
src/widgets/kernel/qwidget.cpp
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@ -2080,8 +2080,15 @@ void QWidgetPrivate::setOpaque(bool opaque)
void QWidgetPrivate::updateIsTranslucent()
{
Q_Q(QWidget);
if (QWindow *window = q->windowHandle())
window->setOpacity(isOpaque ? qreal(1.0) : qreal(0.0));
if (QWindow *window = q->windowHandle()) {
QSurfaceFormat format = window->format();
const int oldAlpha = format.alphaBufferSize();
const int newAlpha = q->testAttribute(Qt::WA_TranslucentBackground)? 8 : 0;
if (oldAlpha != newAlpha) {
format.setAlphaBufferSize(newAlpha);
window->setFormat(format);
}
}
}
static inline void fillRegion(QPainter *painter, const QRegion &rgn, const QBrush &brush)