C#•4mo ago

Avalonia UI - binding in markup extension?

Hi, I'm trying to create a localization extension for my new desktop app and I want to support binding in my localization markup extension, how can I do that? I can receive the binding (CompiledBindingExtension) as a parameter and somehow I managed to get a value out of it to translate it but only by changing the Converter instance in the binding, which can be no-go in the future and also if I changed the language, all other localized strings changed because I used a ReflectionBinding for them but I don't know how to do it when I accept binding as a parameter? I'm kinda lost... Can anyone help me please? Here is my current implementation that only accept string keys: (I deleted the implementation for the binding as it was not working properly...)

1 Reply

Honza K.•4mo ago

    public class StringLocalizationExtension : MarkupExtension
    {
#pragma warning disable IDE0290 // Use primary constructor
        public StringLocalizationExtension(string key)
        {
            Key = key;
        }
#pragma warning restore IDE0290 // Use primary constructor
        public string? Key { get; set; }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            var binding = new ReflectionBindingExtension($"[{Key}]")
            {
                Mode = BindingMode.OneWay,
                Source = Internal.StringLocalizationResolver.Instance,
            };

            return binding.ProvideValue(serviceProvider);
        }
    }

    public class StringLocalizationResolver(ICAFluentUINet.Abstractions.Localization.IStringLocalizer stringLocalizer) : INotifyPropertyChanged
    {
        private readonly IStringLocalizer _stringLocalizer = stringLocalizer;
        private const string IndexerName = "Item";
        private const string IndexerArrayName = "Item[]";

#pragma warning disable CS8612 // Nullability of reference types in type doesn't match implicitly implemented member.
        public event PropertyChangedEventHandler PropertyChanged;
#pragma warning restore CS8612 // Nullability of reference types in type doesn't match implicitly implemented member.
        public static StringLocalizationResolver? Instance { get; set; }

        public string this[string key] => _stringLocalizer.Get(key);

        public void Invalidate()
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(IndexerName));
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(IndexerArrayName));
        }
    }

    public class StringLocalizationExtension : MarkupExtension
    {
#pragma warning disable IDE0290 // Use primary constructor
        public StringLocalizationExtension(string key)
        {
            Key = key;
        }
#pragma warning restore IDE0290 // Use primary constructor
        public string? Key { get; set; }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            var binding = new ReflectionBindingExtension($"[{Key}]")
            {
                Mode = BindingMode.OneWay,
                Source = Internal.StringLocalizationResolver.Instance,
            };

            return binding.ProvideValue(serviceProvider);
        }
    }

    public class StringLocalizationResolver(ICAFluentUINet.Abstractions.Localization.IStringLocalizer stringLocalizer) : INotifyPropertyChanged
    {
        private readonly IStringLocalizer _stringLocalizer = stringLocalizer;
        private const string IndexerName = "Item";
        private const string IndexerArrayName = "Item[]";

#pragma warning disable CS8612 // Nullability of reference types in type doesn't match implicitly implemented member.
        public event PropertyChangedEventHandler PropertyChanged;
#pragma warning restore CS8612 // Nullability of reference types in type doesn't match implicitly implemented member.
        public static StringLocalizationResolver? Instance { get; set; }

        public string this[string key] => _stringLocalizer.Get(key);

        public void Invalidate()
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(IndexerName));
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(IndexerArrayName));
        }
    }

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Avalonia UI - binding in markup extension?