xamarin/Xamarin.Forms

[Bug] Some views not visible when swiping back and forth through CarouselView containing a FlexLayout

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#8,956 opened on Dec 18, 2019

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a/bindablelayouta/carouselviewa/flexe/5 :clock5:help wantedinactivep/Androidp/iOS 🍎t/bug :bug:up-for-grabs

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Description

I have a page with a CarouselView containing a FlexLayout DataTemplate. When I swipe through all the pages of the carousel view and then go back to the beginning, the views on the first and last page are no longer visible. Occurs on Android only.

Workaround

I found that if you nest the FlexLayout in a Grid the pages will stay visible.

Expected Behavior

When swiping back and forth through Carousel Views all views should reappear correctly.

Actual Behavior

Views do not reappear.

Basic Information

  • Version with issue: Xamarin.Forms 4.4.0
  • Platform Target Frameworks:
    • Android: 9.0

Reproduction Link

CarouselBugsRepro.zip

Contributor guide

Research direction
Investigate the interaction between CarouselView and FlexLayout on Android, focusing on layout invalidation and measure logic when swiping back and forth.
Tech stack
csharp
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Xamarin.FormsAndroid SDK
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40