52 lines
1.5 KiB
C#
52 lines
1.5 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Text;
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using System.Windows;
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using System.Windows.Data;
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namespace Plane.Windows.Converters
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{
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public class NullableBooleanConverter<T> : IValueConverter
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{
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public NullableBooleanConverter(T trueValue, T falseValue, T nullValue)
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{
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True = trueValue;
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False = falseValue;
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Null = nullValue;
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}
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public T True { get; set; }
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public T False { get; set; }
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public T Null { get; set; }
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public virtual object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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{
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if (value != null && !(value is bool?))
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throw new InvalidOperationException("The target must be a Nullable<bool>");
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var val = (bool?)value;
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return
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val == null
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? Null
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: val.Value
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? True
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: False;
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}
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public virtual object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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{
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if (!(value is T))
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throw new InvalidOperationException($"The target must be a {typeof(T).Name}");
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var comparer = EqualityComparer<T>.Default;
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var val = (T)value;
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return
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comparer.Equals(val, True)
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? true
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: comparer.Equals(val, False)
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? false
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: (bool?)null;
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}
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}
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}
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