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Added an optional "ConvertBack" method to FuncValueConverter (#19920)

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This commit is contained in:
zacfromaustinpowder
2025-11-13 18:50:03 +10:00
committed by GitHub
parent 538a4b2993
commit 5ab8604436
1 changed files with 52 additions and 4 deletions
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src/Avalonia.Base/Data/Converters/FuncValueConverter.cs
+52 -4
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@@ -13,16 +13,28 @@ namespace Avalonia.Data.Converters
public class FuncValueConverter<TIn, TOut> : IValueConverter
{
private readonly Func<TIn?, TOut> _convert;
private readonly Func<TOut?, TIn>? _convertBack;
/// <summary>
/// Initializes a new instance of the <see cref="FuncValueConverter{TIn, TOut}"/> class.
/// </summary>
/// <param name="convert">The convert function.</param>
/// <param name="convert">The function to convert TIn to TOut.</param>
public FuncValueConverter(Func<TIn?, TOut> convert)
{
_convert = convert;
}
/// <summary>
/// Initializes a new instance of the <see cref="FuncValueConverter{TIn, TOut}"/> class.
/// </summary>
/// <param name="convert">The function to convert TIn to TOut.</param>
/// <param name="convertBack">The function to convert TOut back to In.</param>
public FuncValueConverter(Func<TIn?, TOut> convert, Func<TOut?, TIn>? convertBack)
{
_convert = convert;
_convertBack = convertBack;
}
/// <inheritdoc/>
public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
{
@@ -39,7 +51,19 @@ namespace Avalonia.Data.Converters
/// <inheritdoc/>
public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
{
throw new NotImplementedException();
if (_convertBack == null)
{
throw new NotImplementedException();
}
if (TypeUtilities.CanCast<TOut>(value))
{
return _convertBack((TOut?)value);
}
else
{
return AvaloniaProperty.UnsetValue;
}
}
}
@@ -53,16 +77,28 @@ namespace Avalonia.Data.Converters
public class FuncValueConverter<TIn, TParam, TOut> : IValueConverter
{
private readonly Func<TIn?, TParam?, TOut> _convert;
private readonly Func<TOut?, TParam?, TIn>? _convertBack;
/// <summary>
/// Initializes a new instance of the <see cref="FuncValueConverter{TIn, TParam, TOut}"/> class.
/// </summary>
/// <param name="convert">The convert function.</param>
/// <param name="convert">The function to convert TIn to TOut.</param>
public FuncValueConverter(Func<TIn?, TParam?, TOut> convert)
{
_convert = convert;
}
/// <summary>
/// Initializes a new instance of the <see cref="FuncValueConverter{TIn, TParam, TOut}"/> class.
/// </summary>
/// <param name="convert">The function to convert TIn to TOut.</param>
/// <param name="convertBack">The function to convert TOut back to In.</param>
public FuncValueConverter(Func<TIn?, TParam?, TOut> convert, Func<TOut?, TParam?, TIn>? convertBack = null)
{
_convert = convert;
_convertBack = convertBack;
}
/// <inheritdoc/>
public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
{
@@ -79,7 +115,19 @@ namespace Avalonia.Data.Converters
/// <inheritdoc/>
public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
{
throw new NotImplementedException();
if (_convertBack == null)
{
throw new NotImplementedException();
}
if (TypeUtilities.CanCast<TOut>(value) && TypeUtilities.CanCast<TParam>(parameter))
{
return _convertBack((TOut?)value, (TParam?)parameter);
}
else
{
return AvaloniaProperty.UnsetValue;
}
}
}
}