[Interest] Drawing on viewport

[Tony Rietwyk]

I think that works because QScrollArea's events are actually remapped for the viewport anyway.  

Tony

> -----Original Message-----
> From: interest-bounces+tony=rightsoft.com.au at qt-project.org
> [mailto:interest-bounces+tony=rightsoft.com.au at qt-project.org] On Behalf
> Of igor.mironchik at gmail.com
> Sent: Thursday, 27 March 2014 8:35 PM
> To: Konstantin Tokarev; interest at qt-project.org
> Subject: Re: [Interest] Drawing on viewport
> 
> Ok.
> 
> But it works in QTextEdit.
> 
> Look:
> 
> void QTextEdit::paintEvent(QPaintEvent *e) {
>     Q_D(QTextEdit);
>     QPainter p(d->viewport);
>     d->paint(&p, e);
> }
> 
> -----Original Message-----
> From: Konstantin Tokarev
> Sent: Thursday, March 27, 2014 10:32 AM
> To: igor.mironchik at gmail.com ; interest at qt-project.org
> Subject: Re: [Interest] Drawing on viewport
> 
> 
> 27.03.2014, 12:28, "igor.mironchik at gmail.com" <igor.mironchik at gmail.com>:
> > Hi.
> >
> > I m working on TextEdit widget for QtMWidgets library.
> >
> > TextEdit is a subclass of ScrollArea that derived from AbstractScrollArea.
> > AbstractScrollArea is implemented like QAbstractScrollArea and has
> > viewport as child widget.
> >
> > In TextEdit s paintEvent I want to draw directly on viewport. And I
> > initialize QPainter with:
> >
> > QPainter p( viewport() );
> >
> > But I receive folowing warning:
> >
> > QWidget::paintEngine: Should no longer be called
> >
> > QPainter::begin: Paint device returned engine == 0, type: 1
> >
> > QPainter::setPen: Painter not active
> >
> > and nothing draws.
> >
> > What am I doing wrong?
> 
> One does not simply paint on the other widget.
> 
> 
> --
> Regards,
> Konstantin
> 
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