https://raphlinus.github.io/ui/druid/2019/11/22/reactive-ui....
https://raphlinus.github.io/rust/druid/2020/09/25/principled...
https://raphlinus.github.io/ui/druid/2019/11/22/reactive-ui....
https://raphlinus.github.io/rust/druid/2020/09/25/principled...