QScrollArea transparent

**bunjee** · 22nd June 2008, 18:20

I want my QScrollArea background to be transparent.

Any ideas?

**bunjee** · 22nd June 2008, 21:13

I've subclassed QScrollArea adding the following statement.

Qt Code:

Switch view

QPalette p(viewport()->palette());
p.setBrush(QPalette::Window, Qt::NoBrush);
viewport()->setPalette(p);

QPalette p(viewport()->palette());
p.setBrush(QPalette::Window, Qt::NoBrush);
viewport()->setPalette(p);

To copy to clipboard, switch view to plain text mode

Unfortunately it kills the performances.
Is there a Faster way ?

Mr Arnaud.

**bunjee** · 23rd June 2008, 10:54

I guess I'm going to code my own optimized QScrollArea....

**fanat9** · 23rd June 2008, 13:55

Didn't notice any performance problem:

Qt Code:

Switch view

...
QPalette palette = this->palette();
palette.setColor(QPalette::Window, QColor::fromRgb(255,255,255,0));
 
QScrollArea *negativeArea = new QScrollArea(dockNegativePanel);
componentNegative = new ComponentPanel("Negative", negativeArea);
negativeArea->setWidget(componentNegative);
negativeArea->setPalette(palette);
negativeArea->setBackgroundRole(QPalette::Window);
...

...
QPalette palette = this->palette();
palette.setColor(QPalette::Window, QColor::fromRgb(255,255,255,0));

QScrollArea *negativeArea = new QScrollArea(dockNegativePanel);
componentNegative = new ComponentPanel("Negative", negativeArea);
negativeArea->setWidget(componentNegative);
negativeArea->setPalette(palette);
negativeArea->setBackgroundRole(QPalette::Window);
...

To copy to clipboard, switch view to plain text mode