Hi all
i try to set Opacity on masked QDialog but it doesn't fully set it
i still have the Main QDialog background color shown , it is masked with round corners
only the round corners get Opacity ..
here is the code it is in the paintEvent method :

Qt Code: 
  1. QPainter painter(this);
  2.     painter.setRenderHints(QPainter::Antialiasing);
  3.     const QPalette& pal = palette();
  4.     float thickline = 1.5;//_sizes.thicker_line();
  5.     float border_rad = thickline * 4.0;
  6.     float w = width();
  7.     float h = height();
  8.     QImage mask_img(width(), height(), QImage::Format_Mono);       
  9.     mask_img.fill(0xff);       
  10.     QPainter mask_ptr(&mask_img);       
  11.     mask_ptr.drawRoundedRect( QRectF( 0, 0, w, h),       
  12.                                   border_rad+thickline/2.0,
  13.                                   border_rad+thickline/2.0 );
  14.  
  15.    QBitmap bmp = QBitmap::fromImage(mask_img);       
  16.         setMask( bmp );
  17.  
  18.         QBrush bg_brush( pal.color(QPalette::Active, QPalette::Window) );
  19.         QPen border_pen( pal.color(QPalette::Active, QPalette::Dark) );
  20.         border_pen.setWidthF(thickline);
  21.         border_pen.setJoinStyle(Qt::RoundJoin);
  22.         painter.setPen(border_pen);
  23.         QRectF bg_rect = QRectF( thickline/2.0,
  24.                                 thickline/2.0,
  25.                                 w-thickline,
  26.                                 h-thickline );
  27.  
  28.         painter.setBrush(bg_brush);
  29.  
  30.         painter.setOpacity(0);   <-----------------------------------HERE IS THE PROBLEMATIC CODE
  31.         mask_ptr.setOpacity(0);
  32.  
  33.         mask_ptr.drawRoundedRect( QRectF( 0, 0, w, h),       
  34.                                   border_rad+thickline/2.0,
  35.                                   border_rad+thickline/2.0 );
  36.  
  37.         painter.drawRoundedRect( bg_rect,
  38.                                  border_rad,
  39.                                  border_rad );
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