xamarin/Xamarin.Forms

UWP Nested Scrolling causes measure crash

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#9,158 创建于 2020年1月10日

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

描述

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?

贡献者指南

技术栈
csharp
领域
mobile
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
C#XAMLUWP layout
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
40
研究方向
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.