ShouldUpdateModel<St> typedef Null safety

ShouldUpdateModel<St> = bool Function(St state)

A test of whether or not your converter or vm function should run in response to a State change. For advanced use only. Some changes to the State of your application will mean your converter or vm function can't produce a useful Model. In these cases, such as when performing exit animations on data that has been removed from your Store, it can be best to ignore the State change while your animation completes. To ignore a change, provide a function that returns true or false. If the returned value is false, the change will be ignored. If you ignore a change, and the framework needs to rebuild the Widget, the builder function will be called with the latest Model produced by your converter or vm functions.


typedef ShouldUpdateModel<St> = bool Function(St state);