Treeview scrollbar not updating when inserting rows

[jpn]

Looks like QTreeView maintains its private "view items" structure which gets out of sync due to reimplemented QTreeView::rowsInserted(). Perhaps you should forget about reimplementing it and try to deliver the data in some kind of batches instead of continuous flow.

[Khal Drogo]

Thats bad news, i really need to keep the flow as fast and as continuous as possible.
I know of no other way of making only those items update which are visible, than that presented. Because this *has* to happen in order not to freeze up the gui, or keep the cpu continually at 100% when visually nothing happens. And this has the scrollbar problem.
Do you have another solution suggestion, perhaps?

Thanks very much for your assistance.

[pherthyl]

So updating at every received row is too much overhead, and updating never causes the scrollbars to be out of sync. So why don't you just update periodically? Update twice a second or so. Should keep the cpu usage manageable, and the scrollbars will be reasonably up to date..

Although it sure sounds like there should be a better solution to this problem...

[pherthyl]

Also you can perhaps try minimizing the cost of updates by setting uniformRowHeight and making sure the header is not set to ResizeToContents

[Khal Drogo]

Thank you, pherthyl, albeit a little late on my thanks
I used most of your solutions, though i dont really know a correct way of forcing an update on the view every 1-2 seconds. Maybe by giving a model a list of visible mapped to source indexes(because i use a proxy model aswell) to emit dataChanged on all of them?
I ended up buffering the row inserting on the model side, and emitting beginInsertRows/endInsertRows on every 20 inserts.