You can try, setting these attributes on the widget:

1. setAttribute(Qt::WA_NoBackground);
2. setAttribute(Qt::WA_NoSystemBackground);
3. setAttribute(Qt::WA_TranslucentBackground);

additionally, you could set setAutoFillbackground(false).

setAutoFillBackground didn’t simply work.
WA_NoBackground was obsolete and the successor WA_OpaquePaintEvent said in opposite way, and didn’t work either.
WA_NoSystemBackground and WA_TranslucentBackground ended up with a little bit repainting issue, since it never automatically updated newly exposed area, for instance. Then the tough part would turn to that I have to paint everything underneath the widget.

If memory severed me, QFrame is by default transparent, don’t know how it get that.

Gerolf wrote:

You can try, setting these attributes on the widget:

1. setAttribute(Qt::WA_NoBackground);
2. setAttribute(Qt::WA_NoSystemBackground);
3. setAttribute(Qt::WA_TranslucentBackground);

additionally, you could set setAutoFillbackground(false).

I hope you know that a QScrollArea consists of two widgets?
it has the scroll area itself and the viewport widget. Both must be transparent….

I was aware of that. I set those attribute on both widget.

Gerolf wrote:

I hope you know that a QScrollArea consists of two widgets? it has the scroll area itself and the viewport widget. Both must be transparent….

its little bit old, but the problem seems to be still up to date.

if you use

scroll->setStyleSheet(“background-color:transparent;”);

its working pretty good, but the “Scroll Bar” is getting transparent too,
making it pretty hard to scroll.

if someone knows how to fix it, please post.

try adding

maybe it would work, but there is a syntax error

my fault, I didnt
#include <qscrollbar.h>

but there is still a little “pattern” in there.
the part where the scroll bar is not covered.

http://img534.imageshack.us/img534/2594/ddddiw.jpg

but looks almost perfect.

thanks*

€ or maybe this is just the normal “natural” scroll bar pattern
if you use white it’s gone.

You can customize everything in the scrollbar just by using css… try taking a look here [doc.qt.digia.com] and try out different css commands…

hope this will be helpful to you