B4J Question xCLV InsertAt keep all visible items visible

Alexander Stolte · Jan 27, 2022

I am developing a view which has an endless scroll back and forth, unfortunately there is a problem with InsertAt in B4J, as soon as I use the InsertAt function the list jumps 1 item up.

"ScrollViewOffsetY" works only after a sleep(50) and there you notice a jump of the list.

Is there a way to tell the index to go +1 automatically when using InsertAt?

Erel · Jan 28, 2022

The best way to avoid such jumps is by (almost) never changing the ScrollView size. You start with a very tall list and you add and remove items without changing the list size.

Example 1: https://www.b4x.com/android/forum/t...for-lists-that-grow-backwards.126444/#content
Example 2: https://www.b4x.com/android/forum/threads/xcustomlistview-loop-infinite-horizontal.115767/#content

Erel · Jan 28, 2022

The best way to avoid such jumps is by (almost) never changing the ScrollView size. You start with a very tall list and you add and remove items without changing the list size.

Example 1: https://www.b4x.com/android/forum/t...for-lists-that-grow-backwards.126444/#content
Example 2: https://www.b4x.com/android/forum/threads/xcustomlistview-loop-infinite-horizontal.115767/#content

Alexander Stolte · Jan 28, 2022

Erel said:
The best way to avoid such jumps is by (almost) never changing the ScrollView size.

ahhh, now I also understand the sense of the big panel at the clv backwards, ok thanks!

B4J Question xCLV InsertAt keep all visible items visible

Alexander Stolte

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Erel

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Alexander Stolte

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B4J Question xCLV InsertAt keep all visible items visible

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