xamarin/Xamarin.Forms

UWP Nested Scrolling causes measure crash

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#9,158 opened on 2020年1月10日

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a/scrollviewe/4 :clock4:help wantedi/highinactivep/UWPt/bug :bug:up-for-grabs

説明

Description

If you have a layout that is similar to ScrollView Listview (with fixed height)

UWP Crashes. It should at the very least allow this if the height is fixed on the listview.

Steps to Reproduce

  1. Add a page with a Scrollview
  2. Add a listview inside the scrollview
  3. Run

Expected Behavior

Should just work like it does on iOS and Android

Actual Behavior

Crashes with measuring issues

Basic Information

  • Version with issue: 4.4.0.991265
  • Last known good version: Unknown
  • IDE:
    • UWP: 1903

Additional

I note the issue linked on the scrollview, but this issue blocks basic dashboards. I want a list of items that are bound to data in an Expander Control with a header. I want it to have multiple widgets on said dashboard that includes charts and lists etc. You can't do this in UWP but it works fine in every other platform setting the height at run-time. It would be really great if the listview allowed you to say "Just show every item" and then disabled or didn't render it's scrollview inside, as an alternative, but really this should work identically to iOS and Android.

Alternatively, what's the work around to create a scrolling dashboard of widgets with lists?

コントリビューターガイド

技術スタック
csharp
領域
mobile
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
half day
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
mostly clear
前提条件
C#XAMLUWP layout
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
40
調査方針
Investigate the UWP ScrollView renderer in Xamarin.Forms to understand why a nested ListView causes a measure crash. Review comments in the issue for any additional context. Look at the native UWP layout system and how Xamarin.Forms handles measure cycles. Consider whether a workaround like disabling the inner scrollview when height is fixed is feasible.