Section constructor

Section({
  1. required MessageBuilder builder,
  2. Button? button,
  3. Thumbnail? thumbnail,
})

Implementation

Section({
  required this.builder,
  Button? button,
  Thumbnail? thumbnail,
})  : assert(
        button == null || thumbnail == null,
        'Accessory must be either a button or a thumbnail, not both.',
      ),
      _button = button,
      _thumbnail = thumbnail;