How to transparent QIconView

[wesley]

Hello, everybody here..

I have a critical problem.
I want to make the background of QIconView transparent.
I had tried some things below, but all of them doesn't work!!!
1. set background origin, this works for QLabel , etc, but not for QIconView

setBackgroundOrigin(QWidget::ParentOrigin);
viewport()->setBackgroundOrigin(QWidget::ParentOrigin);

setBackgroundOrigin(QWidget::ParentOrigin);
viewport()->setBackgroundOrigin(QWidget::ParentOrigin);

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2. set backgroundMode, but get i background fill with black, not i want

viewport()->setBackgroundMode(Qt::NoBackground)
setBackgroundMode(Qt::NoBackground);

viewport()->setBackgroundMode(Qt::NoBackground)
setBackgroundMode(Qt::NoBackground);

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3. use setMask, causes some X errors ? I don't know what it is. it seems critical.

void MyIconView::updateMask()	
{
    QBitmap bm( size() );
    bm.fill( color0 );
 
    QRect cr = contentsRect();
    QPainter paint;
    paint.begin( &bm, this );
    paint.setBrush( color1 );	
    paint.setPen( color1 );
 
    drawContents(&paint,  cr.x(), cr.y(), cr.width(), cr.heigth()); // this cause some X error (invalid match.....some thing like this ... QT debug many things )
 
    paint.end();
    setMask( bm );
}

void MyIconView::updateMask()	
{
    QBitmap bm( size() );
    bm.fill( color0 );

    QRect cr = contentsRect();
    QPainter paint;
    paint.begin( &bm, this );
    paint.setBrush( color1 );	
    paint.setPen( color1 );

    drawContents(&paint,  cr.x(), cr.y(), cr.width(), cr.heigth()); // this cause some X error (invalid match.....some thing like this ... QT debug many things )
    
    paint.end();
    setMask( bm );
}

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I can not find out a way to go through this function.
Any idea?

Thanks ...

/WX