maskFilter static method

Map<String, dynamic>? maskFilter(MaskFilter? filter)

Returns a MaskFilter from the specified map.

The type key specifies the kind of mask filter.

A type of blur creates a MaskFilter.blur. The style key (enumValue of BlurStyle, defaults to BlurStyle.normal) is used as the blur style, and the sigma key (double, defaults to 1.0) is used as the blur sigma.

If the type is none of these, but is not null, then the type is looked up in maskFilterDecoders, and if an entry is found, this method defers to that callback.

Otherwise, returns null.

Implementation

static Map<String, dynamic>? maskFilter(MaskFilter? filter) {
  if (filter == null) return null;
  String type = filter.toString();
  if (type.startsWith('MaskFilter.blur(')) {
    List<String> parts = type.split(', ');
    return {
      'type': 'blur',
      'style': parts[0],
      'sigma': parts[1],
    };
  } else {
    final encoder = maskFilterEncoders[filter.runtimeType];
    if (encoder != null) {
      return encoder(filter);
    }
    return null;
  }
}