Binding Issue

[szv]

@MartinZikmund @morning4coffe-dev
As promised... Here is the issue we talked about today :)

Codebreaker.Xaml/src/Codebreaker.Uno/CodebreakerUno/Views/Components/PegSelectionComponent.xaml

Line 26 in 2dad6dc

ItemsSource="{Binding ElementName=ThisControl, Path=DataContext.Game.FieldValues[colors], Mode=OneWay}"

The above mentioned binding does not work on all platforms.
✅WinUI Head
❌WASM
❌Android
❌Skia/WPF
Not tested on other platforms

[Youssef1313]

Hi @szv

It looks like this is relying on an Azure Container App that's currently off:

So, can't get straight to reproducing this inside the app.

If you can get the app up and running again (or get a more simplified repro with a new unoapp), please let me know.

Thank you!

[Youssef1313]

Also, it could be that the binding is evaluated early at a point where the dictionary or game wasn't yet initialized. If you can try to manually call Bindings.Update in GamePage at a point when you know the dictionary is initialized and let us know if that works, it would help understanding the issue more.

[szv]

Hi @Youssef1313

Yes we had some trouble with the backend. It's now redeployed (with a new Uri).
The backend should now be reachable, if you pull the latest changes.

Thanks

[Youssef1313]

@szv Thanks for the update.

I investigated this, and the root cause is unoplatform/uno#9886.

Specifically, the problematic binding is this one:

Codebreaker.Xaml/src/Codebreaker.Uno/CodebreakerUno/Views/Pages/GamePage.xaml

Lines 105 to 109 in b365dd2

	<components:PegSelectionComponent
	x:Name="PegSelection"
	Grid.Row="1"
	Visibility="{x:Bind ViewModel.GameStatus, Mode=OneWay, Converter={StaticResource GameStatusVisibility}, ConverterParameter=Cancelable}"
	ViewModel="{x:Bind ViewModel, Mode=OneWay}" />

The way this binding works on WinUI is that it calls PegSelectionComponent.ViewModel setter. However, in Uno, it calls SetValue(ViewModelProperty, value) directly, bypassing the following line:

Codebreaker.Xaml/src/Codebreaker.WinUI/Views/Components/PegSelectionComponent.xaml.cs

Line 22 in b365dd2

DataContext = ViewModel;

As a workaround, the change in #162 should work.