[Qt-qml] Executable code in a model?

[Alan Alpert]

On Tue, 16 Nov 2010 22:50:05 Kellomaki Pertti (Nokia-MS/Tampere) wrote:
> Is it possible to have executable code as part of a model element? In a
> hypothetical Scheme based QML I could create a list model that contains
> <string, procedure> pairs, and then in a list view a delegate could
> simply call the procedure:
> 
> (define file-menu
>    (list
>        (list "Save"
>               (lambda () (save-file)))  ; executable code
>        (list "Quit"
>               (lambda () (quit))))
> 
> Does QML allow something like this, or is there some other convenient
> way to glue together e.g. labels and actions?

While I'm going to withhold judgment for now on whether what I'm suggesting is 
a good idea, you can just have strings of javascript in the model and execute 
them with eval(). e.g

ListModel{
ListElement{
	name: "Save"
	action: "saveFile()"
}
ListElement{
	name: "Quit"
	action: "Qt.quit()"
}
}

and inside the delegate somewhere: eval(action);

Not quite the same as your example, because the code as a string will be 
evaluated in the context of wherever eval was called but if save-file() was 
still visible in that context then it would work.

-- 
Alan Alpert
Software Engineer
Nokia, Qt Development Frameworks