textScaler method

@preferInline TextScaler textScaler({ String key = FlutterPropertyKeys.textScaler, TextScaler defaultValue = TextScaler.noScaling, Object? target, bool warmUp = false, })

Retrieves a TextScaler value from the JSON map for the given key.

Looks up the value associated with key in the JSON. If the value is already a TextScaler, it is returned as is. If the value is a Map<String, dynamic>, it attempts to parse it into a TextScaler. Otherwise, it returns defaultValue.

• key: The key to look up in the JSON map. Defaults to 'textScaler'.
• defaultValue: The value to return if the key is not found or cannot be resolved. Defaults to TextScaler.noScaling.

Returns:

• A TextScaler if the value is valid or can be parsed.
• defaultValue if the value is not a valid TextScaler or cannot be parsed.
• null if both the value and defaultValue are null.

Implementation

@preferInline
TextScaler textScaler({
  String key = FlutterPropertyKeys.textScaler,
  TextScaler defaultValue = TextScaler.noScaling,
  Object? target,
  bool warmUp = false,
}) {
  final value = _readProp(key, target, warmUp);

  if (value is TextScaler) return value;

  if (value == null) return defaultValue;

  switch (value) {
    case Map<String, dynamic>():
      if (envAttributeWarmUpEnabled) {
        if (warmUp) {
          return _textScalerFromMap(value);
        } else {
          return _json[key] = _textScalerFromMap(value);
        }
      } else {
        return _json[key] = _textScalerFromMap(value);
      }
    case double():
      if (envAttributeWarmUpEnabled) {
        if (warmUp) {
          return TextScaler.linear(value);
        } else {
          return _json[key] = TextScaler.linear(value);
        }
      } else {
        return _json[key] = TextScaler.linear(value);
      }
    default:
      return defaultValue;
  }
}