aloisdeniel/flutter_device_preview

Custom WidgetsBinding

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#10 opened on Oct 20, 2019

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enhancementhelp wanted

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Description

Ideally, a custom WidgetsBinding should be provided to emulate the host.

This would allow to emulate more things :

  • Application lifecycle events
  • Memory pressure event
  • Platform channels
  • A mouse pointer

The DevicePreview.appBuilder (injects a custom MediaQuery) and DevicePreview.of(context).locale parameters wouldn't be needed anymore too since they would be managed by the binding itself.

The issue is that the WidgetBindings.instance is unique and static, so it is not possible to override it only from the encapsulated user app.

Contributor guide

Research direction
Implement a custom WidgetsBinding subclass that overrides the static instance. Research Flutter's binding mechanism and how to replace WidgetsBinding.instance. Explore using Zone or other dependency injection patterns to provide a custom binding in the device preview context.
Tech stack
dartflutter
Domain
frontendmobile
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
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
FlutterDart
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35