A11y: Voiceover sequence of elements gets messed up once reaching the end in navigation page

[jantanis]

Description

When reaching the end of a page in voiceover the reader jumps back, but thing get messy and the original sequence of elements is not abided.

Steps to Reproduce

1. Open attached solution
2. Run iOS project on real device
3. Start screenreader
4. Swipe throught elements
5. Continue swiping back and forth after reaching the last item

Expected Behavior

When reaching the last element, you should only be able to swipe back up or reset to first item and index should always be abided.

Actual Behavior

After reaching the last element things get messy when you continue swiping back and forth. You're not able to reach all elements on screen anymore (nav bar title for example)

Basic Information

• Version with issue: 4.2.0.778463
• Last known good version: n/a
• IDE: VS for Mac 8.3.10.2
• Platform Target Frameworks:
  • iOS: 13.2
• Affected Devices: iOS

Reproduction Link

A11Y.zip

[samhouts]

@jantanis I didn't really see it get stuck when I tested this. I can move back and forth, and I can always get to the title, and it doesn't ever go out of TabIndex order.

However, I do notice that you're putting the TabIndex on the StackLayout but not on the Buttons. This would give the Buttons TabIndex of 0 (default), so they should technically be first. That's a bug that we fix in #9702. StackLayouts are not focusable, so the TabIndex is ignored. Do you expect the children to inherit the layout's TabIndex?

[jantanis]

@samhouts just tried again on my iPhone 11 Pro, not ok:
https://filebin.net/1ze7gzwi0t2cft5l/RPReplay_Final1582716656.mov?t=a2xzxwmv

Regarding stacklayout tabindex: Yes, it would life make significantly easier if you could "inherit" the tabindex. And as you can see in the screen capture, it does look like it works that way.

[samhouts]

@jantanis Ok, I'll add inheriting TabIndex as an enhancement. Would you mind testing your solution with https://github.com/xamarin/Xamarin.Forms/files/4248008/Xamarin.Forms.4.4.0.993247.nupkg.zip? to see if it improves the bug you've reported here? Keep in mind that this new package will now focus the elements without a TabIndex first.

Thanks!

[conradh]

Same problem for us. Quite a showstopper

[jantanis]

@jantanis Ok, I'll add inheriting TabIndex as an enhancement. Would you mind testing your solution with https://github.com/xamarin/Xamarin.Forms/files/4248008/Xamarin.Forms.4.4.0.993247.nupkg.zip? to see if it improves the bug you've reported here? Keep in mind that this new package will now focus the elements without a TabIndex first.

Thanks!

@samhouts Looks good to me!