static ObjectConverters()
{
Type = new RelayValueConverter((value, targetType, parameter, culture) => value?.GetType(),
(value, targetType, parameter, culture) =>
{
if (value is Type type)
{
return(Activator.CreateInstance(type));
}
return(null);
});
Exist = new RelayValueConverter((value, targetType, parameter, culture) => value != null);
UnsetIfNull = new RelayValueConverter((value, targetType, parameter, culture) => value ?? DependencyProperty.UnsetValue);
ParameterIfNull = new RelayValueConverter((value, targetType, parameter, culture) => value ?? parameter);
AssignableFrom = new RelayValueConverter((value, targetType, parameter, culture) =>
{
var valueType = value?.GetType();
var parameterType = parameter as Type;
if (valueType == null || parameterType == null)
{
return(false);
}
return(parameterType.IsAssignableFrom(valueType));
});
Format = new RelayValueConverter(FormatValue);
}
static StringConverters()
{
EmptyWatermark = new RelayValueConverter((value, targetType, parameter, culture) =>
{
var watermark = parameter?.ToString() ?? "<Empty>";
var stringValue = value?.ToString();
return(string.IsNullOrEmpty(stringValue) ? watermark : stringValue);
});
UnsetIfEmpty = new RelayValueConverter((value, targetType, parameter, culture) =>
{
var stringValue = value?.ToString();
return(string.IsNullOrEmpty(stringValue) ? DependencyProperty.UnsetValue : stringValue);
});
IsEmpty = new RelayValueConverter((value, targetType, parameter, culture) =>
{
var stringValue = value?.ToString();
return(string.IsNullOrEmpty(stringValue));
});
DisplayName = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value == null)
{
return(string.Empty);
}
if (value is Type valueAsType)
{
return(valueAsType.GetDisplayName());
}
var valueType = value.GetType();
if (valueType.IsEnum)
{
var fieldInfo = valueType.GetField(value.ToString());
if (fieldInfo != null)
{
return(fieldInfo.GetDisplayName());
}
}
return(value.ToString());
});
FirstNotEmpty = new RelayMultiValueConverter((objects, type, parameter, culture) =>
{
var result = objects.Enumerate().FirstOrDefault(o => !string.IsNullOrEmpty(o.GetEffectiveString()));
return(result);
});
}
static CollectionConverters()
{
Sort = new RelayValueConverter((value, targetType, parameter, culture) => CreateView(value, parameter.Enumerate <SortDescription>()));
Group = new RelayValueConverter((value, targetType, parameter, culture) => CreateView(value, parameter.Enumerate <GroupDescription>()));
GroupAndSort = new RelayValueConverter((value, targetType, parameter, culture) => CreateView(value, parameter.Enumerate()));
Any = new RelayValueConverter((value, targetType, parameter, culture) => value.Enumerate().Any());
Count = new RelayValueConverter((value, targetType, parameter, culture) => value.Enumerate().Count());
Contain = new RelayMultiValueConverter((values, targetType, parameter, culture) =>
{
if (values.Length < 2)
{
return(false);
}
var components = values[0].Enumerate().ToList();
var element = values[1];
var treatNullElementNameAsPresentInCollection = parameter is bool boolParameter && boolParameter;
if (treatNullElementNameAsPresentInCollection && element == null)
{
return(true);
}
return(components.Contains(element));
});
DoesNotContain = new RelayMultiValueConverter((values, targetType, parameter, culture) =>
Contain.Convert(values, targetType, parameter, culture).AreEqual(false));
FirstOrDefault = new RelayMultiValueConverter((values, targetType, parameter, culture) =>
{
if (values.Length < 2)
{
return(false);
}
var components = values[0].Enumerate().ToList();
var element = values[1];
var result = components.FirstOrDefault(e => e.AreEqual(element)) ??
components.Enumerate <IIDAware>().FirstOrDefault(c => c.Id.AreEqual(element));
if (result == null && element is IIDAware idAwareElement)
{
result = components.Enumerate <IIDAware>().FirstOrDefault(c => c.Id.AreEqual(idAwareElement.Id));
}
return(result);
});
}
static TypeConverters()
{
DisplayName = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value is Type type)
{
return(type.GetDisplayName());
}
return(null);
});
EnumValues = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value is Type type && type.IsEnum)
{
return(type.GetEnumValues());
}
return(null);
});
}
static BoxConverters()
{
StringToInt32 = new RelayValueConverter(
(value, targetType, parameter, culture) => Convert <String, Int32>(value, IsNullable(targetType), culture),
(value, targetType, parameter, culture) => Convert <Int32, String>(value, IsNullable(targetType), culture));
Int32ToString = new RelayValueConverter(
(value, targetType, parameter, culture) => Convert <Int32, String>(value, IsNullable(targetType), culture),
(value, targetType, parameter, culture) => Convert <String, Int32>(value, IsNullable(targetType), culture));
StringToDecimal = new RelayValueConverter(
(value, targetType, parameter, culture) => Convert <String, Decimal>(value, IsNullable(targetType), culture),
(value, targetType, parameter, culture) => Convert <Decimal, String>(value, IsNullable(targetType), culture));
DecimalToString = new RelayValueConverter(
(value, targetType, parameter, culture) => Convert <Decimal, String>(value, IsNullable(targetType), culture),
(value, targetType, parameter, culture) => Convert <String, Decimal>(value, IsNullable(targetType), culture));
DoubleToGridLength = new RelayValueConverter(
(value, targetType, parameter, culture) => value is double d ? new GridLength(d) : GridLength.Auto,
(value, targetType, parameter, culture) => value is GridLength gridLength ? gridLength.Value : 0d);
}
static ImageConverters()
{
Generic = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value is ResourceDescriptor resource)
{
value = resource.GetResource();
}
if (value == null)
{
return(null);
}
targetType = parameter as Type ?? targetType;
var converter = TypeDescriptor.GetConverter(value.GetType());
if (converter.CanConvertTo(targetType))
{
return(converter.ConvertTo(value, targetType));
}
if (typeof(ImageSource).IsAssignableFrom(targetType))
{
if (value is Geometry geometry)
{
return(new DrawingImage
{
Drawing = new GeometryDrawing
{
Brush = new SolidColorBrush(Theme.Current.Colors.MainForeground),
Geometry = geometry
}
});
}
}
return(value);
});
}
static NumericConverters()
{
Invert = new RelayValueConverter(InvertFunc, InvertFunc);
Abs = new RelayValueConverter(AbsFunc, AbsFunc);
Add = new RelayValueConverter(AddFunc, SubtractFunc);
Subtract = new RelayValueConverter(SubtractFunc, AddFunc);
Multiply = new RelayValueConverter(MultiplyFunc, DivideFunc);
Divide = new RelayValueConverter(DivideFunc, MultiplyFunc);
StringToNumeric = new RelayValueConverter(StringToNumericFunc, NumericToStringFunc);
NumericToString = new RelayValueConverter(NumericToStringFunc, StringToNumericFunc);
MultiAdd = new RelayMultiValueConverter((objects, type, parameter, culture) =>
{
var queue = new Queue <object>(objects.Enumerate().Select(obj =>
{
if (obj == null)
{
return(0);
}
return(obj.GetType().IsNumeric() ? obj : 0);
}));
if (!queue.Any())
{
return(null);
}
if (!queue.TryDequeue(out var result))
{
return(null);
}
while (queue.TryDequeue(out var sub))
{
result = (dynamic)result + (dynamic)sub;
}
return(result);
});
MultiSubtract = new RelayMultiValueConverter((objects, type, parameter, culture) =>
{
var queue = new Queue <object>(objects.Enumerate().Select(obj =>
{
if (obj == null)
{
return(0);
}
return(obj.GetType().IsNumeric() ? obj : 0);
}));
if (!queue.Any())
{
return(null);
}
if (!queue.TryDequeue(out var result))
{
return(null);
}
while (queue.TryDequeue(out var sub))
{
result = (dynamic)result - (dynamic)sub;
}
if (parameter is bool isPositive && isPositive)
{
return((dynamic)result > 0 ? result : type.GetSystemDefaultValue());
}
return(result);
});
Min = new RelayValueConverter((value, type, parameter, culture) =>
{
var left = (dynamic)(value ?? 0);
var right = (dynamic)(parameter ?? 0);
return(left < right ? left : right);
});
Max = new RelayValueConverter((value, type, parameter, culture) =>
{
var left = (dynamic)(value ?? 0);
var right = (dynamic)(parameter ?? 0);
return(left > right ? left : right);
});
MultiMin = new RelayMultiValueConverter((objects, type, parameter, culture) =>
{
var itemsToCompare = objects.Where(item => item != null && item.GetType().IsNumeric())
.ToList();
object result = null;
foreach (var item in itemsToCompare)
{
if (result == null)
{
result = item;
}
if ((dynamic)item < (dynamic)result)
{
result = item;
}
}
return(result.ConvertNumericValueTo(type));
});
MultiMax = new RelayMultiValueConverter((objects, type, parameter, culture) =>
{
var itemsToCompare = objects.Where(item => item != null && item.GetType().IsNumeric())
.ToList();
object result = null;
foreach (var item in itemsToCompare)
{
if (result == null)
{
result = item;
}
if ((dynamic)item > (dynamic)result)
{
result = item;
}
}
return(result.ConvertNumericValueTo(type));
});
IsLessThan = new RelayValueConverter((value, type, parameter, culture) => (dynamic)(value ?? 0) < (dynamic)(parameter ?? 0));
IsLessThanOrEqual = new RelayValueConverter((value, type, parameter, culture) => (dynamic)(value ?? 0) <= (dynamic)(parameter ?? 0));
IsBiggerThan = new RelayValueConverter((value, type, parameter, culture) => (dynamic)(value ?? 0) > (dynamic)(parameter ?? 0));
IsBiggerThanOrEqual = new RelayValueConverter((value, type, parameter, culture) => (dynamic)(value ?? 0) >= (dynamic)(parameter ?? 0));
IsEqual = new RelayValueConverter((value, type, parameter, culture) => (dynamic)(value ?? 0) == (dynamic)(parameter ?? 0));
ToGridLength = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value == null)
{
return(GridLength.Auto);
}
var converter = TypeDescriptor.GetConverter(typeof(GridLength));
if (converter.CanConvertFrom(value.GetType()))
{
return(converter.ConvertFrom(value));
}
throw new NotSupportedException();
},
(value, targetType, parameter, culture) =>
{
if (value == null)
{
return(GridLength.Auto);
}
var converter = TypeDescriptor.GetConverter(typeof(GridLength));
if (converter.CanConvertFrom(value.GetType()))
{
return(converter.ConvertFrom(value));
}
throw new NotSupportedException();
});
}
static ColorConverters()
{
const double defaultCoefficient = 0.2;
Opacity = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (!(parameter is double coefficient))
{
coefficient = defaultCoefficient;
}
coefficient = Math.Max(Math.Min(coefficient, 1), 0);
var sourceColor = value.ToColor();
if (sourceColor == null)
{
return(null);
}
var targetColor = ApplyOpacity(sourceColor.Value, coefficient);
return(PrepareTargetColor(targetColor, targetType ?? value.GetType()));
});
Generic = new RelayValueConverter((value, targetType, parameter, culture) =>
{
var sourceColor = value.ToColor();
if (sourceColor == null)
{
return(null);
}
targetType = parameter as Type ?? targetType ?? value.GetType();
return(PrepareTargetColor(sourceColor.Value, targetType));
});
Shade = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (!(parameter is double coefficient))
{
coefficient = defaultCoefficient;
}
coefficient = Math.Max(Math.Min(coefficient, 1), 0);
var sourceColor = value.ToColor();
if (sourceColor == null)
{
return(null);
}
var targetColor = ApplyShade(sourceColor.Value, coefficient);
return(PrepareTargetColor(targetColor, targetType ?? value.GetType()));
});
ContrastForeground = new RelayValueConverter((value, targetType, parameter, culture) =>
{
var sourceColor = value.ToColor();
if (sourceColor == null)
{
return(null);
}
var targetColor = Colors.Black;
var brightness = CalculateBrightness(sourceColor.Value);
var luminance = CalculateLuminance(sourceColor.Value);
if (brightness < 0.5 && luminance < 0.5)
{
targetColor = Colors.White;
}
if (brightness > 0.5 && luminance > 0.5)
{
targetColor = Colors.Black;
}
if (brightness > 0.5 && luminance < 0.5)
{
targetColor = Colors.White;
}
if (brightness < 0.5 && luminance > 0.5)
{
targetColor = Colors.Black;
}
return(PrepareTargetColor(targetColor, targetType ?? value.GetType()));
});
Tint = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (!(parameter is double coefficient))
{
coefficient = defaultCoefficient;
}
coefficient = Math.Max(Math.Min(coefficient, 1), 0);
var sourceColor = value.ToColor();
if (sourceColor == null)
{
return(null);
}
var targetColor = ApplyTint(sourceColor.Value, coefficient);
return(PrepareTargetColor(targetColor, targetType ?? value.GetType()));
});
Invert = new RelayValueConverter((value, targetType, parameter, culture) =>
{
var sourceColor = value.ToColor();
if (sourceColor == null)
{
return(null);
}
var targetColor = ApplyInvert(sourceColor.Value);
return(PrepareTargetColor(targetColor, targetType ?? value.GetType()));
});
}
static BooleanConverters()
{
ToYesNo = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value is bool boolean)
{
return(boolean ? Yes : No);
}
if (value == null)
{
return(Maybe);
}
throw new NotSupportedException();
},
(value, targetType, parameter, culture) =>
{
if (value is string stringValue)
{
if (string.Equals(Yes, stringValue))
{
return(true);
}
if (string.Equals(No, stringValue))
{
return(false);
}
if (string.Equals(Maybe, stringValue))
{
return(null);
}
}
if (value == null)
{
return(null);
}
throw new NotSupportedException();
});
ToVisibilityInverted = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value is bool boolean)
{
return(boolean ? Visibility.Collapsed : Visibility.Visible);
}
if (value == null)
{
return(Visibility.Visible);
}
throw new NotSupportedException();
},
(value, targetType, parameter, culture) =>
{
if (value is Visibility castedValue)
{
switch (castedValue)
{
case Visibility.Visible:
return(false);
case Visibility.Hidden:
case Visibility.Collapsed:
return(true);
}
}
throw new NotSupportedException();
});
ToVisibility = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value is bool boolean)
{
return(boolean ? Visibility.Visible : Visibility.Collapsed);
}
if (value == null)
{
return(Visibility.Collapsed);
}
throw new NotSupportedException();
},
(value, targetType, parameter, culture) =>
{
if (value is Visibility castedValue)
{
switch (castedValue)
{
case Visibility.Visible:
return(true);
case Visibility.Hidden:
case Visibility.Collapsed:
return(false);
}
}
throw new NotSupportedException();
});
Inverted = new RelayValueConverter((value, targetType, parameter, culture) =>
{
if (value is bool boolean)
{
return(!boolean);
}
throw new NotSupportedException();
},
(value, targetType, parameter, culture) =>
{
if (value is bool boolean)
{
return(!boolean);
}
throw new NotSupportedException();
});
MultiAnd = new RelayMultiValueConverter((values, type, parameter, culture) => values.Enumerate <bool>().All(value => value));
MultiOr = new RelayMultiValueConverter((values, type, parameter, culture) => values.Enumerate <bool>().Any(value => value));
}
