[WASM] Listview header and footer are not implemented

[soriyathach]

Current behavior

The listview is not displayed at all if a header or footer is specified on a listview.

Expected behavior

The header, footer and listview content should be displayed.

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

Seems like nothing is implemented on ListViewBase for wasm:
https://github.com/unoplatform/uno/blob/8dcc6f2d3aa5d57fd3ee96efe5fe73855a45a0da/src/Uno.UI/UI/Xaml/Controls/ListViewBase/ListViewBase.netstd.cs

Environment

Nuget Package:

Package Version(s):
UNO.UI 1.46.196-dev.2440

Affected platform(s):

• iOS
• Android
• WebAssembly
• WebAssembly renderers for Xamarin.Forms
• Windows
• Build tasks
• Solution Templates

Visual Studio:

• 2017 (version: )
• 2019 (version: 16.2.0)
• for Mac (version: )

Relevant plugins:

• Resharper (version: )

Anything else we need to know?

[michael-hawker]

Assume this is also for tracking it on the base of ItemsPresenter?

[jeromelaban]

Assume this is also for tracking it on the base of ItemsPresenter?

@michael-hawker Not necessarily, the implementations of both are different (even in WinUI). Do you need it on either or both? Would ItemsRepeater help?

[michael-hawker]

@jeromelaban thanks for getting back to me, I just linked to our PR where we're adding new behavior to the SettingsExpander for this with ItemsPresenter as part of it being an ItemsControl.

We could do a bunch of extra work with a StackPanel and ContentPresenters, but it's super simple to hook-in to the existing properties on the ItemsPresenter for this scenario:

     <ItemsPresenter win:Footer="{TemplateBinding ItemsFooter}"
                     win:Header="{TemplateBinding ItemsHeader}"
                     TabFocusNavigation="Local" />

Want me to spin up a separate issue for tracking ItemsPresenter specifically?

[jeromelaban]

Thanks for the update @michael-hawker, I'll create the issue for ItemsPresenter specifically.

[hawkerm]

Ah, forgot about this. Just tried adding a Header for some content and it's not working on WASM (though I do see the list view items still, unlike the original post). Just the header is missing.

[michael-hawker]

FYI, we have a new approach we're investigating in Windows Community Toolkit Labs for a future/modern DataGrid-light replacement: CommunityToolkit/Labs-Windows#415

This is relying on the use of the property Header on ItemsControl/ListView for the inner ItemsPresenter (see #10745 as well), so this prevents it from working with Uno/WASM.

GitHub

CoordinatedPanel as solution for Modern/Lightweight 'DataGrid'/'DataTable' · CommunityToolkit/Labs-Windows · Discussion #415

Coordinated Panel Problem Statement A lot of times app developers want to display a denser set of data, usually in a grid type format with multiple rows of items that have particular properties (e....