slider_controller | Flutter Package https://pub.dev/packages/slider_controller
flutter_multi_slider | Flutter Package https://pub.dev/packages/flutter_multi_slider/example
Flutter自定义View之——价格选择器｜双向滑动｜手势处理_滑动选择器双向_Code-Porter的博客-CSDN博客 https://blog.csdn.net/a_zhon/article/details/118053025