setContextProperty takes very long and blocks UI

[RudolfVonKrugstein]

Hey,

I am calling "setContextProperty" with a bigger data structure. It is not extremely big (A list with about 100 entries), but it takes several seconds until the call finished.

AND because I have to do that in the main thread, the complete UI is blocked in that time. So what can I do?

Thanks!

[RudolfVonKrugstein]

Hey,

I discovered: It is not setting the data itself. It is the UI structure, that displays the data that takes so long. So I tried disabling the UI Display (It is a ListView) by setting its model to [] while I am loading. But now, re-enabling the UI Display takes long.

What can I do?

[SGaist]

Hi,

What kind of list is ?

[RudolfVonKrugstein]

It is a list of QObjects, which themself each contain a list of QObjects. But I found the error!

The code was like this (pseudo code):

ListView {
    model: cppData
    delegate: ListView {
        model: innerData
        delegate: Item {
             Rectangle {...}
             DropShadow {
                 ...
                visible: isActiveObject
            }
        }
    }
}

So I was creating a lot of DropShadows. Also only one was visible, that was the problem. Removing the DropShadows solved it.