xamarin/Xamarin.Forms

[Bug] Button "released" event not fired when using Shell

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#6,443 opened on Jun 7, 2019

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a/shell :shell:e/2 :clock2:help wantedt/bug :bug:up-for-grabs

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Description

Description

When using Shell, the event "released" on button are not fired if you move your finger while holding the button, even if it's the slightest move. Works well on an application without Shell. Behavior observed only on Android, not iOS.

Steps to Reproduce

  1. Create an application using Shell
  2. Add a button on a page
  3. Wire "released" event to whatever you want
  4. Run the app
  5. Hold the button
  6. Move just a bit your finger
  7. Release your finger

=> No event

Expected Behavior

The event "released" should be fired

Actual Behavior

It's not fired.

Basic Information

  • Version with issue: Tested on 4.0.0.482894 and 4.1.0.483098-pre1

  • Last known good version: None

  • IDE: Visual Studio 2019 16.1.1

  • Platform Target Frameworks:

    • iOS: Works as expected
    • Android: Compile using Android 9.0
    • UWP: Not tested

  • Android Support Library Version: 28.0.0.1

Reproduction Link

ButtonReleasedBugRepro.zip

Contributor guide

Research direction
Analyze the Shell page structure and touch event propagation on Android. Determine why the released event is suppressed when the finger moves. Check if the shell's custom renderer or gesture handling interferes with the button's events.
Tech stack
csharp
Domain
mobile dev
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
csharp
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60