Fading title issue for sections with only one item

[Nams29]

Hi @edsilfer

I noticed that if the user scrolls fast, the fading of some section titles doesn't have the time to update its alpha value : it stays a bit faded or even completely transparent. It seems to happen only for sections with one item, regardless of their position in the list. This bug was also present on the previous version of the library.

Here are two examples : 'J' and 'K' are faded 'D' is invisible and 'G' is faded

Here is an example project : http://www.mediafire.com/file/15xbax4y2mk9wjv/MyApplication.zip

Do you have any idea how to fix this behavior ?

[edsilfer]

Hi @Nams29 , this is how the alpha is computed so far:

private fun computeAlpha(row: View, idx: TextView) = 1 - abs(row.y) / idx.height

I think a possible fix for this bug would be adding a threshold, i.e. if computed alpha is greater than 80%, return 100%. Could you test this approach for the scenario you've described - and also for the general case of fast scrolling with multiple items in a section?

If that doesn't work we might have to start thinking about fancier situations - like computing the scroll speed and disabling the effect for speed greater than a given value. If that is the case the fix will have to wait a little bit.

[zkvarz]

While this issue is still occurring why not to add new attribute in StickyIndex for disabling fading? Awesome library though!

[Swisyn]

@edsilfer I am also having the same issue. Do you have any plans to fix that issue? Also there is a flickering issue while scrolling the bubble, I've tried to fix it but no luck :/