[Qt-interest] How to disable combo box list items?

[Robert Hairgrove]

J-P Nurmi wrote:
> On Mon, Dec 29, 2008 at 9:36 PM, Robert Hairgrove 
> <evorgriahr at hispeed.ch> wrote:
> 
>     What would be the easiest way of graying out list items similar to when
>     a menu item is disabled? I have a configuration dialog with stacked
>     widgets selected by a combo box (a QComboBox created in QtDesigner).
> 
>     In this particular case, I am offering database support for a limited
>     number of interfaces: MySQL, MSAccess, ODBC and SQLite. The idea would
>     be to keep the same code base accross different platforms, but maybe
>     disable MSAccess support on Linux.
> 
>     Looks like there is no built-in way to do this? I would really like to
>     avoid subclassing the combo box, item delegates etc. if possible (LOTS
>     of work involved there...).
> 
> 
> QComboBox uses QStandardItemModel by default. The following snippet 
> would disable the current item:
> 
> QStandardItemModel* model = 
> qobject_cast<QStandardItemModel*>(comboBox->model());
> if (model) {
>     QModelIndex index = model->index(comboBox->currentIndex(), 
> comboBox->modelColumn(), comboBox->rootModelIndex());
>     QStandardItem* item = model->itemFromIndex(index);
>     if (item) {
>         item->setEnabled(false);
>     }
> }
> 
> --
> J-P Nurmi
> 

Yes, indeed ... that works wonderfully. Thank you! :)