protected override ConversionResult <ViewStates> Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
switch (value)
{
case bool boolValue:
return(ConversionResult <ViewStates> .SetValue(boolValue?ViewStates.Invisible : ViewStates.Visible));
case int intValue:
return(ConversionResult <ViewStates> .SetValue(intValue > 0?ViewStates.Invisible : ViewStates.Visible));
case float floatValue:
return(ConversionResult <ViewStates> .SetValue(floatValue > 0?ViewStates.Invisible : ViewStates.Visible));
case double doubleValue:
return(ConversionResult <ViewStates> .SetValue(doubleValue > 0?ViewStates.Invisible : ViewStates.Visible));
case string stringValue:
return(ConversionResult <ViewStates> .SetValue(!string.IsNullOrEmpty(stringValue)?ViewStates.Invisible : ViewStates.Visible));
case IEnumerable <object> enumerableValue:
return(ConversionResult <ViewStates> .SetValue(enumerableValue?.Any() ?? false?ViewStates.Invisible : ViewStates.Visible));
default:
return(ConversionResult <ViewStates> .SetValue(value != null?ViewStates.Invisible : ViewStates.Visible));
}
}
protected override ConversionResult <object> ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
if (targetType.IsInstanceOfType(value))
{
return(ConversionResult <object> .SetValue(value));
}
switch (value)
{
#if __IOS__
case NSDate dateTimeValue when targetType == typeof(DateTime):
return(ConversionResult <object> .SetValue((DateTime)dateTimeValue));
case NSDate dateTimeValue when targetType == typeof(DateTime?):
return(ConversionResult <object> .SetValue((DateTime?)dateTimeValue));
case NSDate dateTimeValue when targetType == typeof(DateTimeOffset):
return(ConversionResult <object> .SetValue((DateTimeOffset)(DateTime)dateTimeValue));
case NSDate dateTimeValue when targetType == typeof(DateTimeOffset?):
return(ConversionResult <object> .SetValue((DateTimeOffset?)(DateTime?)dateTimeValue));
case nint enumValue when targetType.IsEnum:
return(ConversionResult <object> .SetValue(Enum.ToObject(targetType, enumValue)));
#endif
case int enumValue when targetType.IsEnum:
return(ConversionResult <object> .SetValue(Enum.ToObject(targetType, enumValue)));
}
return(ConversionResult <object> .SetValue(System.Convert.ChangeType(value, targetType)));
}
protected override ConversionResult <bool> Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
switch (value)
{
case bool boolValue:
return(ConversionResult <bool> .SetValue(!boolValue));
case int intValue:
return(ConversionResult <bool> .SetValue(!(intValue > 0)));
case float floatValue:
return(ConversionResult <bool> .SetValue(!(floatValue > 0)));
case double doubleValue:
return(ConversionResult <bool> .SetValue(!(doubleValue > 0)));
case string stringValue:
return(ConversionResult <bool> .SetValue(string.IsNullOrEmpty(stringValue)));
case IEnumerable <object> enumerableValue:
return(ConversionResult <bool> .SetValue(!(enumerableValue?.Any() ?? false)));
default:
return(ConversionResult <bool> .SetValue(value == null));
}
}
protected override ConversionResult <object> Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (targetType.IsInstanceOfType(value))
{
return(ConversionResult <object> .SetValue(value));
}
switch (value)
{
#if __IOS__
// https://docs.microsoft.com/en-us/xamarin/cross-platform/macios/nativetypes
case int intValue when targetType == typeof(nint):
return(ConversionResult <object> .SetValue((nint)intValue));
case long longValue when targetType == typeof(nint):
return(ConversionResult <object> .SetValue((nint)longValue));
case uint uintValue when targetType == typeof(nuint):
return(ConversionResult <object> .SetValue((nuint)uintValue));
case ulong ulongValue when targetType == typeof(nuint):
return(ConversionResult <object> .SetValue((nuint)ulongValue));
case float floatValue when targetType == typeof(nfloat):
return(ConversionResult <object> .SetValue((nfloat)floatValue));
case double doubleValue when targetType == typeof(nfloat):
return(ConversionResult <object> .SetValue((nfloat)doubleValue));
case DateTime dateTimeValue when targetType == typeof(NSDate):
return(ConversionResult <object> .SetValue((NSDate)dateTimeValue));
case DateTimeOffset dateTimeOffsetValue when targetType == typeof(NSDate):
return(ConversionResult <object> .SetValue((NSDate)dateTimeOffsetValue.UtcDateTime));
case Enum enumValue when targetType == typeof(nint):
return(ConversionResult <object> .SetValue((nint)System.Convert.ToInt32(enumValue)));
#endif
case Enum enumValue when targetType == typeof(int):
return(ConversionResult <object> .SetValue(System.Convert.ToInt32(enumValue)));
case NamedValue namedValue when targetType == typeof(string):
return(ConversionResult <object> .SetValue(namedValue.ToString()));
}
return(ConversionResult <object> .SetValue(System.Convert.ChangeType(value, targetType)));
}
protected override ConversionResult <object> ConvertBack(ViewStates value, Type targetType, object parameter, CultureInfo culture)
{
switch (targetType)
{
case Type boolType when boolType == typeof(bool):
return(ConversionResult <object> .SetValue(value == ViewStates.Invisible));
case Type intType when intType == typeof(int):
return(ConversionResult <object> .SetValue(value == ViewStates.Invisible? 1 : 0));
case Type floatType when floatType == typeof(float):
return(ConversionResult <object> .SetValue(value == ViewStates.Invisible? 1 : 0));
case Type doubleType when doubleType == typeof(double):
return(ConversionResult <object> .SetValue(value == ViewStates.Invisible? 1 : 0));
default:
return(ConversionResult <object> .UnsetValue());
}
}
protected override ConversionResult <bool> ConvertBack(ViewStates value, Type targetType, object parameter, CultureInfo culture)
{
return(ConversionResult <bool> .SetValue(value == ViewStates.Visible));
}
protected override ConversionResult <ViewStates> Convert(bool value, Type targetType, object parameter, CultureInfo culture)
{
return(ConversionResult <ViewStates> .SetValue(value?ViewStates.Visible : ViewStates.Invisible));
}
protected override ConversionResult <bool> ConvertBack(bool value, Type targetType, object parameter, CultureInfo culture)
{
return(ConversionResult <bool> .SetValue(!value));
}