SimpleCustomProperty constructor

SimpleCustomProperty(Map<String, double> mapConversion, { int significantFigures = 10, bool removeTrailingZeros = true, bool useScientificNotation = true, Map<String, String>? mapSymbols, dynamic name, })

Class for simple custom conversions. E.g.:

final Map<String, double> conversionMap = {
 'EUR': 1,
 'USD': 1.2271,
 'GBP': 0.9033,
 'JPY': 126.25,
 'CNY': 7.9315,
};
final Map<String, String> mapSymbols = {
 'EUR': '€',
 'USD': '\$',
 'GBP': '₤',
 'JPY': '¥',
 'CNY': '¥',
};
var customConversion = SimpleCustomProperty(conversionMap, mapSymbols: mapSymbols);
customConversion.convert('EUR', 1);
Unit usd = customConversion.getUnit('USD');
print('1€ = ${usd.stringValue}${usd.symbol}');

Implementation

SimpleCustomProperty(this.mapConversion,
    {super.significantFigures,
    super.removeTrailingZeros,
    super.useScientificNotation,
    super.mapSymbols,
    name})
    : assert(mapConversion.containsValue(1),
          'One conversion coefficient must be 1, this will considered the base unit'),
      assert(() {
        if (mapSymbols != null) {
          for (var val in mapConversion.keys) {
            if (!mapSymbols.keys.contains(val)) {
              return false;
            }
          }
        }
        return true;
      }(),
          'mapSymbols should be null or containing all the keys of mapConversion'),
      super(
        name: name ?? 'SimpleCustomProperty',
        conversionTree: _convertMapToConversionTree(mapConversion),
      );