ListView in ScrollView is creating delegates for all items, insted of only those visible

[danipellex]

Hi all,

A ListView is showing a model with a large set of data, as the only element of a ScrollView: only visible items have their delegates created. Delegates are creating/destroying as needed. And ListView.cacheBuffer property is available to fine tune the result. Perfect.

My problem: If my ListView is a part of a composition, and this composition is the content of a ScrollView, then all my items/delegates are created!! The can be too many --> Performance problems. I would like to have delegates creating and destroying as they are entering the visible area of the ScrollView, but i don't know how to do it. Any ideas?

Thank you
dani

OK:

ScrollView {
       ListView {
             model: mylargemodel
             delegate: Item {...} // only visible items/delegates are created: OK
       }
}

NOT OK:

ScrollView {
       Item {
              Item {...}
              Item {...}
              ListView {
                    model: mylargemodel
                    delegate: Item {...} // ALL ITEMS ARE CREATED!! THOUSANDS!!
              }
              Item {...}
       }
}

[danipellex]

I am not finding the way to do this: to have ListView virtualization in all ListView usages.
Someone is able to undertand why?

[jpnurmi]

This post is deleted!