xamarin/Xamarin.Forms

[Bug] CollectionView invisible items hold space and are selectable

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#8,227 opened on Oct 25, 2019

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a/collectionviewe/4 :clock4:help wantedinactivep/Androidp/UWPp/iOS 🍎t/bug :bug:up-for-grabs

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Description

Description

I am using CollectionView to create Accordion. The CollectionView needs to show Grouped items when user clicks on the header and again hides it with another click. But the issue is that the hidden items stills hold their space and are selectable. In the screenshot below the Group1 items are holding as much space as Group2 and the second item is selected in Group1 although it's items are Invisible.

Basic Information

  • Version with issue:Xamarin.Forms-4.3.0.908675
  • IDE:VSMac
  • Affected Devices:iOS and Android

Screenshots

CollectionView

Reproduction Link

ShellRepro.zip

Contributor guide

Research direction
Inspect the CollectionView's item layout logic, focusing on how IsVisible property affects item sizing and selection. Trace the code path when items are toggled invisible to identify where space is still being reserved.
Tech stack
csharpiosandroid
Domain
frontendmobile
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.
1-3 hours
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
C#Xamarin.Forms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65