B4J Question Customlistview disable autoscroll with InsertAt

The list isn't scrolled (at least not explicitly) when you insert items. It just that the current visible items change their offsets.

Set InsertAnimationDuration to 0 and change the scroll position with SetScrollViewOffset after you insert items.

Hi Erel,

Thanks for the reply.

I already had InsertAnimationDuration at 0 and had tried firstvisibleindex and scrollto - neither of which solved the problem.

I have tried the offset but I seem to be doing something wrong as it still doesn't stay anywhere near the original position when using insert at the start...it is closer when i multiply the offset by 2 but still not right. A quick calculation shows that offset should reposition it to the original location. The logging shows that the initial positioning error when adding to the start is compounded every time with fractional values appearing when I read the initial offset position before the insert. Using a small number of inserts (10 or less) shows the relative movement better. Adding to the end works fine.

Any help would be appreciated

Check this class: https://www.b4x.com/android/forum/t...for-lists-that-grow-backwards.126444/#content

Thanks for the suggestion.

I tried it but it doesn't leave items in exactly the same position before new items are added. I modified the button to generate 5 at a time which made the movement more visible.

I also ran the example I sent with row heights set to 40 and added 50 records followed by inserting 50 at the head of the clv. No matter whether I used scrollto or offsetY to move 50 forward to the original (at 0) it moved approx halfway, then I doubled it to 100 and got out of bounds... 99 worked and positioned it a page short of where it should be... similarly increasing offsetY to the full height of all rows (or even above) resulted in the repositioning stopping approx 1 page (visible clv area) short.

I also tried inserting 1000 zero height rows and using replaceat from the 500 median. Visually the result was identical - including the repositioning falling short. It seems to me as if adding at the head of the clv puts am internal counter out. Maybe you could suggest a different control to try where I can control positioning and adding large numbers of objects

Thanks