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widgets: Clarify QWidgetRepaintManager::sync of specific widget

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Change-Id: Ifa2a8245decfcb2b36c1952a39ec60b7eeca6e43
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
This commit is contained in:
Tor Arne Vestbø 2019-08-26 14:57:44 +02:00
parent af686f5aef
commit 25026defdc
1 changed files with 6 additions and 3 deletions
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9
src/widgets/kernel/qwidgetrepaintmanager.cpp
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@ -707,9 +707,9 @@ static QPlatformTextureList *widgetTexturesFor(QWidget *tlw, QWidget *widget)
/*!
Synchronizes the \a exposedRegion of the \a exposedWidget with the backing store.
If there's nothing to repaint, the area is flushed and painting does not occur;
otherwise the area is marked as dirty on screen and will be flushed right after
we are done with all painting.
If there are dirty widgets, including but not limited to the \a exposedWidget,
these will be repainted first. The backingstore is then flushed to the screen,
regardless of whether or not there were any repaints.
*/
void QWidgetRepaintManager::sync(QWidget *exposedWidget, const QRegion &exposedRegion)
{
@ -730,6 +730,9 @@ void QWidgetRepaintManager::sync(QWidget *exposedWidget, const QRegion &exposedR
return;
}
// As requests to sync a specific widget typically comes from an expose event
// we can't rely solely on our own dirty tracking to decide what to flush, and
// need to respect the platform's request to at least flush the entire widget,
QPoint offset = exposedWidget != tlw ? exposedWidget->mapTo(tlw, QPoint()) : QPoint();
markNeedsFlush(exposedWidget, exposedRegion, offset);