unoplatform/uno

`ListBox` is not implemented

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#1,362 opened on Aug 11, 2019

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area/porting 🖨️difficulty/medium 🤔has-repro-branchhelp wantedkind/bugplatform/wasm 🌐project/items 🧾

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Description

Current behavior

When the ItemsSource on a ListBox is set, no items are populated. However, if the browser is maximised or otherwise resized, the items will populate.

Expected behavior

ListBox is populated as soon as ItemsSource is set.

How to reproduce it (as minimally and precisely as possible)

  • Clone this repo: https://github.com/MelbourneDeveloper/RestClient.Net
  • Hard reset to Tag UnoIssue1362
  • Open the samples solution
  • Restore NuGets
  • Run the sample RestClient.Net.Samples.Uno.Wasm
  • Click the 'Get My Repos' button. Notice that the "Loading..." text comes up quickly and disappears but you do not see any items in the ListBox.
  • Resize the browser window
  • Notice items show up in the top ListBox

Environment

Windows 10 Firefox (WASM)

Visual Studio

  • 2017 (version: 15.9.14)

Anything else we need to know?

This has happened in multiple different projects. It also happens in Edge.

Contributor guide

Research direction
Investigate how ListBox handles ItemsSource changes and layout updates. Look at the measurement pass and when items are realized.
Tech stack
csharp
Domain
frontend
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#XAML
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75