Substitute of Qt::NotROP in QT4.5

[shivam.priyadarshi]

Hi Everybody,

I am porting an application from QT3.3 to QT4.5. The Qt3.3 code use setRasterOp function to set the mode Qt::NotROP. Following is snippet of code.

void setPainter(QPainter *p)
{
   p->translate(-contentsX(), -contentsY());
  p->scale(d->Scale, d->Scale);
  p->translate(-d->ViewX1, -d->ViewY1);
  p->setPen(Qt::DotLine);
 
  p->setRasterOp(Qt::NotROP);  // background should not be erased
 
 p->drawLine(..........);
}

void setPainter(QPainter *p)
{
   p->translate(-contentsX(), -contentsY());
  p->scale(d->Scale, d->Scale);
  p->translate(-d->ViewX1, -d->ViewY1);
  p->setPen(Qt::DotLine);
 
  p->setRasterOp(Qt::NotROP);  // background should not be erased
 
 p->drawLine(..........);
}

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I wish to know what is substitution of Qt:NotROP in QT4. I have already tried [ p->setCompositionMode(QPainter::CompositionMode_Sour ceOut); ] which i found most close to NoTROP in Enum table. But this donot give same effect as Qt::NotROP. I am painting on viewport of Q3ScrollArea on mouse movement.

I will be thankful for your help.

[wysota]

There is no simple substitution. The concept of painting in Qt4 has changed and you shouldn't try to paint outside the paint event, if that's what you are doing.