seriesDateTimeMinMax method
Returns the DataTime
minimum and maximum value for each series.
Implementation
Map<C, List<DateTime>> seriesDateTimeMinMax(
{bool sortSeriesByCategory = false}) {
var seriesDates =
seriesDateTime(sortSeriesByCategory: sortSeriesByCategory);
var entries = seriesDates.entries.map((e) {
var datesMinMax = _datesMinMax(e.value);
return datesMinMax != null ? MapEntry(e.key, datesMinMax) : null;
}).whereType<MapEntry<C, List<DateTime>>>();
return Map<C, List<DateTime>>.fromEntries(entries);
}