[Qt-interest] Drawing a rect around a QCheckBox

[Malyushytsky, Alex]

My guess is the order of operation.
Your drawing occurs BEFORE checkbox paint event.
So checkbox might paint over your rectangle.

I think you should to find a way to paint your rectangle AFTER Checkbox paint iself.
This might be either:
-  filter out paint event completely, draw Check box yourself before drawing the rectangle in your event handler;
-  Subclass checkbox, override paintEvent and do drawing of the rectangle there right after the call to QCheckBox: paintEvent;
-  create custom event and call PostEvent  in your message handler. This event will be delivered AFTER checkbox is processed and you can draw your rectangle there.


Regards Alex

-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Giacomo
Sent: Wednesday, September 16, 2009 4:23 AM
To: Ulf-Alexander v. Ceumern-Lindenstjerna
Cc: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Drawing a rect around a QCheckBox

On Wednesday 16 September 2009 12:09:33 you wrote:
> Hi Giacomo.
>
> What happens exactly? Is the code executed? Does the rect have the
> correct position and size?


Hi, thanks.

Yes, the code is executed,
A qDebug() prints the correct rectangle:

qDebug() << "widget rect: " << d_widget->rect(); /* see the code below */

The code is inside a objectFilter whose event() method intercepts
QEvent::Paint.

The code draws correctly the rectangle for QPushButtons, QLabels, QLineEdits,
and other custom QWidgets on which the same event filter is installed.

> Is the checkbox maybe drawn on top of the rect?

What does this mean? Maybe yes, I don't know. What I am sure is that
I call installEventFIlter on the checkbox and that event filter intercepts
QEvent::Paint

Thanks

>
> Regards, Ulf
>
> > -----Original Message-----
> > From: qt-interest-bounces at trolltech.com [mailto:qt-interest-
> > bounces at trolltech.com] On Behalf Of Giacomo
> > Sent: Wednesday, September 16, 2009 11:11 AM
> > To: qt-interest at trolltech.com
> > Subject: [Qt-interest] Drawing a rect around a QCheckBox
> >
> > Hi to all!
> >
> > I want to draw a rect around a QCheckbox.
> >
> > The code is as follows
> >
> > else if(event->type() == QEvent::Paint) /* inside a paint event */
> >   {
> >     QPaintEvent *paintEvent = static_cast<QPaintEvent*> (event);
> >
> >     if(paintEvent)
> >     {
> >       QPainter painter(d_widget); /* d_widget is a checkbox */
> >       qDebug() << "widget rect: " << d_widget->rect();
> >       QColor color = Qt::blue;
> >       QPen pen(color);
> >       pen.setWidth(2);
> >       painter.setPen(pen);
> >       QRect r = d_widget->rect();
> >       painter.drawRect(r)
> >       return false;/* do not filter out the event */
> >     }
> >   }
> >
> > While the code works fine on all other widgets i apply it (push
> > buttons,
> > QLabels...) in the checkbox no way.
> >
> > Thanks for any hint.
> >
> > Giacomo.
> >
> > ing. Giacomo Strangolino
> > Elettra - Synchrotron Radiation Facility - Trieste, Italy
> >
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest
>
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