/// <summary>
/// Converts an input value by looking it up as a key in dictionary and returning the mapped value for it.
/// </summary>
/// <param name="value"></param>
/// <param name="targetType"></param>
/// <param name="parameter"></param>
/// <param name="culture"></param>
/// <returns></returns>
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var key = value;
if (ReferenceEquals(null, value))
{
return((IsNullable) ? NullValue : FallbackValue);
}
var foundValue = FallbackValue;
if (this.Contains(key))
{
foundValue = this[key];
}
else if (this.Contains(key.ToString()))
{
foundValue = this[key.ToString()];
}
var converter = (foundValue as IValueConverter);
if (ConvertAlsoFoundValueConverter && converter != null)
{
foundValue = converter.Convert(value, targetType, parameter, culture);
}
return(ConverterSpecialValue.Apply(foundValue, value, parameter));
}
/// <summary>
/// Converts back, by looking in the dictionary for matching value and returning the key of the matched value
/// </summary>
/// <param name="value"></param>
/// <param name="targetType"></param>
/// <param name="parameter"></param>
/// <param name="culture"></param>
/// <returns></returns>
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
object result = ConvertBackFallbackValue;
if (IsNullable && Equals(NullValue, value))
{
result = null;
}
else
{
var it = GetEnumerator();
while (it.MoveNext())
{
if (Equals(value, it.Value))
{
result = it.Key;
break;
}
}
}
result = ConverterSpecialValue.Apply(result, value, parameter);
return(result);
}
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
object value = (values.Length > 0)? values[0]: null;
bool equals = false;
if (values.Length > 1)
{
var compareTo = ConverterSpecialValue.Apply(value, value, parameter);
for (int i = 1; i < values.Length; i++)
{
var value2 = values[i];
value2 = ConverterSpecialValue.Apply(value2, value2, parameter);
equals = Equals(compareTo, value2);
if (!equals)
{
break;
}
}
}
var result = (equals != IsNegative) ? TrueValue : FalseValue;
result = ConverterSpecialValue.Apply(result, value, parameter);
//It seems that with multi-binding (as opposed to regular binding),
//WPF doesn't convert result to target-type automatically.
object castedResult;
ConvertHelper.TryChangeType(result, targetType, out castedResult, culture);
return(castedResult);
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
object result;
bool isNegative = (parameter is bool) ? (bool)parameter : IsNegative;
if (ReferenceEquals(null, value))
{
result = (IsNullable) ? NullValue : IsNegative ? TrueValue : FalseValue;
}
else
{
result = (IsInRange(value, _lower, _upper, culture) != isNegative) ? TrueValue : FalseValue;
}
return(ConverterSpecialValue.Apply(result, value, parameter));
}
private object ConvertInternal(object value, Type targetType, object parameter, CultureInfo culture)
{
object result;
if (IsNullable && ReferenceEquals(null, value))
{
result = NullValue;
}
else
{
bool isNegative = (parameter is bool) ? (bool)parameter : IsNegative;
bool equals = Equals(value, Boxed.True);
result = (equals != isNegative) ? TrueValue : FalseValue;
}
return(ConverterSpecialValue.Apply(result, value, parameter));
}
public virtual object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
object result;
if (IsNullable && ReferenceEquals(null, value))
{
result = NullValue;
}
else
{
var compareTo = CompareTo;
compareTo = Equals(compareTo, ConverterSpecialValue.UseConverterParameter) ? parameter : compareTo;
bool equals = Equals(value, compareTo);
result = (equals != IsNegative) ? TrueValue : FalseValue;
}
return(ConverterSpecialValue.Apply(result, value, parameter));
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
bool isNull = ReferenceEquals(null, value);
var isEmpty = false;
if (!isNull)
{
var enumerable = (value as IEnumerable)?.GetEnumerator();
using (enumerable as IDisposable)
{
bool hasValue = enumerable?.MoveNext() ?? false;
isEmpty = !hasValue;
}
}
bool isNullOrEmpty = (isNull && Mode == ComparisonMode.IsNullOrEmpty || isEmpty);
var result = (isNullOrEmpty != IsNegative) ? TrueValue : FalseValue;
return(ConverterSpecialValue.Apply(result, value, parameter));
}
public virtual object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
object result;
var compareTo = IsNegative ? FalseValue: TrueValue;
compareTo = ConverterSpecialValue.Apply(compareTo, value, parameter);
if (Equals(value, compareTo))
{
result = CompareTo;
}
else if (IsNullable && Equals(value, ConverterSpecialValue.Apply(NullValue, value, parameter)))
{
result = null;
}
else
{
result = value;
}
return(ConverterSpecialValue.Apply(result, value, parameter));
}