[Qt-jambi-interest] Problem for displaying header and data

[Vincent Lebreil]

Thanks a lot Gunnar !

It works fine now !

I haven't even thought that returning the same data for all roles could lead
to this behaviour ! So thanks again ! :-D

Best regards !

Vincent

On Mon, Feb 2, 2009 at 1:06 PM, Gunnar Sletta <gunnar at trolltech.com> wrote:

> Vincent Lebreil wrote:
>
>> Hi,
>>
>> I don't understand why nothing is displaying (neither header and data) if
>> I'm using a QTreeView and my own model which inherits QAbstractItemModel.
>>
>> Btw if I use a QStandardItemModel instead, it works fine. Don't understand
>> why ??
>>
>> Best Regards,
>> Vincent
>>
>
> Hi Vincent,
>
> Both the headerData() and data() functions are used to query the model for
> a number of different roles, such as font, color, text, etc. In your
>  example, you do not properly distinguish between roles and you probably end
> up with an invalid font and an invalid color. If you add a
>
> if (role == Qt.ItemDataRole.DisplayRole)
> {
>    // look up string and return it
> }
> else return null;
>
> around your data accessor functions, you should get the proper results.
>
> -
> best regards,
> Gunnar
>
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