inabox/inabox.wpf/Converters/UtilityConverter.cs

using System;
using System.Globalization;
using System.Windows.Data;
namespace InABox.WPF;


public class UtilityConverterEventArgs : EventArgs
{
    public object Value { get; private set; }
    public object Parameter { get; private set; }

    public UtilityConverterEventArgs(object value, object parameter)
    {
        Value = value;
        Parameter = parameter;
    }
}

public delegate void UtilityCoverterEvent(object sender, UtilityConverterEventArgs args);

public abstract class UtilityConverter<TIn, TOut> : IValueConverter
{

    public event UtilityCoverterEvent? Converting;
    public event UtilityCoverterEvent? Deconverting;
    
    public abstract TOut Convert(TIn value);

    public virtual TIn? Deconvert(TOut value)
    {
        return default;
    }
    
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var typed = value is TIn tin ? tin : default;  
        Converting?.Invoke(this,new UtilityConverterEventArgs(typed, parameter));
        return Convert(typed);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var typed = value is TOut tout ? tout : default;  
        Deconverting?.Invoke(this,new UtilityConverterEventArgs(typed, parameter));
        return Deconvert(typed);
    }
}