Le 08/10/2017 à 18:57, pdv a écrit :
The new code contains twice a viewport()->update() without specification
of a rectangle. Since > Qt normally erases the widget's area before the
paintEvent() call
I guess that the whole viewport is erased. Subsequently only part of it
is redrawn except for the case FullScreenUpdate and in that case there
is no problem.
Actually, we use
viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
to ask Qt not to overwrite it. It seems to work on Linux.
Please feel free to look at the code and docs (QWidget and
QAbstractScrollArea) and tell us what I may have missed. I just saw that
we should override viewportEvent() instead of event(), but I am not sure
that it would make a difference.
Can you compile master? Do you see the issue?
JMarc
