[Qt-interest] class composition & communication in Qt

[pmqt71]

the signal-slot is a good solution for my needs as it keeps the widget
reusable.

Could you also indicate me a Qt source code where to see this pattern in
use?

thanks a lot
pm



2010/9/30 Frederico A. M. Prado <famprado at terra.com.br>

> If it is not too much information and the MainWindow knows when he widget
> will need the information you could use  a signal from the main window
> connected to a slow in the widget.
>
> If the MainWindow does not know when to send to information you can
> request the information in the same way, linking a signal from the widget
> to a slot in mainwindow.
>
> The MainWindow can do both connections when it creates the widget. As far
> as I know that is the usual pattern in QT.
>
> If you have to transfer a lot of information, on the other hand, other
> approaches could be better. You could keep the request as a signal/slot,
> but implement a public function in your widget class which accepts the
> data from when called from the MainWindow, for example.
>
>
>
> On Wed, 29 Sep 2010 11:48:05 -0300, pmqt71 <pmqt71 at gmail.com> wrote:
>
> > Hi all,
> >
> > I have a MainWindow and a widget member class.
> >
> > The widget,  while painting, needs information from MainWindow. So what
> > is
> > the best way to access information from the member class to the holding
> > class? Is there an usual pattern in Qt or GOF for this problem?
> >
> > thanks
> > pm
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