xamarin/Xamarin.Forms

[UWP] ListView scroll issues

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#3,573 opened on Aug 15, 2018

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a/listviewe/4 :clock4:help wantedinactivep/UWPt/bug :bug:up-for-grabs

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Description

Description

I have a ListView that demonstrates using the new binding capabilities (TargetNullValue, Fallback Value). Unfortunately the ListView misbehaves on UWP. Following back navigation from the detail page, the list stops scrolling until fingers are replaced on screen.

This is only reproducible when running from a device with a touch screen. I first tested this by remoting from a device with a touch screen and I couldn't reproduce

Steps to Reproduce

  1. Run the sample.
  2. Navigate to detail page (click on a monkey).
  3. Navigate back.
  4. Scroll the ListView.

Expected Behavior

The ListView scrolls perfectly.

Actual Behavior

The ListView scrolls then stops, and only resumes when the scroll gesture is restarted (fingers removed and replaced).

Basic Information

  • Version with issue: 3.2.0.729530-pre2
  • Issue also exists with 3.1 haven't tested back any further
  • IDE: VS2017 15.8
  • Platform Target Frameworks:
    • UWP: 10.0.16299.0

Reproduction Link

DataBindingDemos.zip

Contributor guide

Research direction
Investigate UWP ListView scroll behavior after navigation. Check for touch event handling differences and potential workarounds for scroll interruption.
Tech stack
csharp
Domain
mobiledesktop
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.FormsUWP
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65