visualDensity static method

VisualDensity? visualDensity(DataSource source, List<Object> key)

Returns a VisualDensity from the specified string or map.

If the specified value is a string, then it is interpreted as follows:

• adaptivePlatformDensity: returns VisualDensity.adaptivePlatformDensity (which varies by platform).
• comfortable: returns VisualDensity.comfortable.
• compact: returns VisualDensity.compact.
• standard: returns VisualDensity.standard.

Otherwise, if the specified value is a map, then the keys horizontal and vertical (doubles) are used to create a custom VisualDensity. The specified values must be in the range given by VisualDensity.minimumDensity to VisualDensity.maximumDensity. Missing values are interpreted as zero.

Implementation

static VisualDensity? visualDensity(DataSource source, List<Object> key) {
  final String? type = source.v<String>(key);
  switch (type) {
    case 'adaptivePlatformDensity':
      return VisualDensity.adaptivePlatformDensity;
    case 'comfortable':
      return VisualDensity.comfortable;
    case 'compact':
      return VisualDensity.compact;
    case 'standard':
      return VisualDensity.standard;
    default:
      if (!source.isMap(key)) {
        return null;
      }
      return VisualDensity(
        horizontal: source.v<double>([...key, 'horizontal']) ?? 0.0,
        vertical: source.v<double>([...key, 'vertical']) ?? 0.0,
      );
  }
}