parseColor static method

Color? parseColor(Object? raw)

Parses #RGB, #RRGGBB, #AARRGGBB, rgb(r,g,b) and rgba(r,g,b,a). Returns null when the value is missing or unparseable.

Implementation

static Color? parseColor(Object? raw) {
  if (raw == null) return null;
  if (raw is Color) return raw;
  if (raw is int) return Color(raw);
  var s = raw.toString().trim().toLowerCase();
  if (s.isEmpty) return null;
  if (s.startsWith('rgb')) {
    final nums = RegExp(
      r'[\d.]+',
    ).allMatches(s).map((m) => double.tryParse(m.group(0)!) ?? 0).toList();
    if (nums.length >= 3) {
      final a = nums.length > 3 ? (nums[3] * 255).round() : 255;
      return Color.fromARGB(
        a.clamp(0, 255),
        nums[0].round().clamp(0, 255),
        nums[1].round().clamp(0, 255),
        nums[2].round().clamp(0, 255),
      );
    }
    return null;
  }
  s = s.replaceFirst('#', '').replaceFirst('0x', '');
  if (s.length == 3) {
    s = s.split('').map((c) => '$c$c').join();
  }
  if (s.length == 6) s = 'ff$s';
  if (s.length != 8) return null;
  final v = int.tryParse(s, radix: 16);
  return v == null ? null : Color(v);
}