Batch data prefetch in QAbstractItemModel

[Helios]

Hi.

I'm implementing a QListView with a model that gets its data from the network. When a listing is shown, it gets the entire dataset that will be used for the display role, since this is cheap. However, the decoration role is more expensive, so I want to only fetch those items that will be needed. I could do this inside the data() override, but it would be more efficient if I could know when the view is about to make a bunch of data() calls, so I can fetch all the information in a single network call. I'm not seeing any way to do this. Am I missing something, or is there really no way?

Thanks.

[VRonin]

@Helios said in Batch data prefetch in QAbstractItemModel:

if I could know when the view is about to make a bunch of data() calls

You can't but there is a way around it, albeit not pretty.
When data or multiData requires the decoration add this request to a QQueue then have slot connected to a QTimer that will check whether there is stuff in the queue and process it all at once.