[Interest] extending qtableview with button bar with inheritance

[Sze Howe Koh]

On 16 April 2014 22:40, Mojmír Svoboda <mojmir.svoboda at bistudio.com> wrote:
> Hello,
>
> how to extend a qtableview with a custom button bar? so that the button
> bar is above the qtableview.
>
> i tried something like this, but it does not feel right:
> struct MyTableView : QTableView
> and in the constructor do
> 1) layout = new QVBoxLayout
> 2) setLayout(layout)
> 3) mybuttonbar = new ...
> 4) layout->insertWidget(0, mybuttonbar)
>
> but it behaves in weird ways (endless loop in some parent detection,
> stealing keypresses from qtableview)... so i am not sure that is the way
> to do it.
>
> Another possibility is to create completely different class and using
> composition instead of inheritance. This works well, but for some reason
> i wanted the IS-A relationship above (i do not remember why now).

If you can't think of (or remember) a good reason for a IS-A
relationship, then you should stick to a HAS-A relationship.


> How would you do that, please?

I would use composition instead of inheritance. :)


Regards,
Sze-Howe