toOptionsJSON method
Implementation
@override
void toOptionsJSON(StringBuffer buffer) {
  super.toOptionsJSON(buffer);
  if (enabled != null) {
    buffer.writeAll(['"enabled":', enabled, ','], '');
  }
  if (inside != null) {
    buffer.writeAll(['"inside":', inside, ','], '');
  }
  if (style != null) {
    buffer.writeAll(['"style":', style?.toJSON(), ','], '');
  }
  if (verticalAlign != null) {
    buffer.writeAll(['"verticalAlign":', jsonEncode(verticalAlign), ','], '');
  }
}