Hey Janne,
If you not sure what exactly type returned by dynamic_cast, you may
want to check returned pointer on 0 (and probably throw an exception),
or use dynamic_cast of reference (instead of pointer) to delegate
exception throwing to the C++.
Using dynamic_cast's allows you to save some memory because you
don't need to keep redundant pointer to the widgets which are already
in widgets hierarchy.
PS. dynamic_cast in that case is used to downcast here, not upcast.
2010/11/18 Janne Rönkkö <[email protected]>
> Hi,
>
> I would suggest that you store the WText pointers to some other place
> and access those widgets from there. You might not even need to store
> the WTable pointer (depends what you are doing and how are you doing it).
>
> In my opinion using dynamic_cast can indeed solve the problem, and might
> even look like an elegant solution but in the long run using
> dynamic_cast will probably just cause more issues. For example, if
> someone adds something else to the cell in addition to WText your
> solution using dynamic_cast will probably broke and it might be quite
> hard to find. I would dare to say that if you try to find a solution not
> using dynamic_cast you will end up with a better solution than the
> current one. I mean that is the code updating the table data doing too
> many things?
>
> On 17.11.2010 18:03, Wim Dumon wrote:
> > Always use dynamic_cast to upcast. dynamic_cast will return 0 if the
> > object is of the wrong type. I believe this should work:
> >
> > WString tableText = dynamic_cast<WText
> > *>(table->elementAt(0,0)->widget(0))->text());
> >
> > Wim.
> >
> > 2010/11/17 Magnus Arntzen<[email protected]>:
> >> Hi.
> >>
> >> When I create a WTable and fill it with text, is it possible to access
> >> that text again?
> >>
> >> ex:
> >>
> >> WTable *table = new WTable(this);
> >> new WText("Hello World!", table->elementAt(0,0));
> >>
> >> WString tableText = table->elementAt(0,0)->text(); //WOULD BE NICE IF
> >> THIS WORKED
> >>
> >> I tried casting the WTableCell to WInteractWidget and further to WText,
> >> but dereferencing text() causes run-time error.
> >>
> >> Is there a way to do this?
> >> (this is for printing/exporting table contents)
> >>
> >> Thanks!
> >>
> >> -Magnus
> >>
> >>
> ------------------------------------------------------------------------------
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> Spend less time writing and rewriting code and more time creating great
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--
// Dmitriy.
------------------------------------------------------------------------------
Beautiful is writing same markup. Internet Explorer 9 supports
standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3.
Spend less time writing and rewriting code and more time creating great
experiences on the web. Be a part of the beta today
http://p.sf.net/sfu/msIE9-sfdev2dev
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