mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
0c6e3416d8
Previously we didn't distinguish between canceling the menu (which popped the route with no return value, i.e. null) and explicitly selecting an item whose value is null (pop with value null). Both fired onChange(null). Now we box the return value so we can distinguish the two cases. I would have preferred to just disallow "null" as a value but it turns out people like being able to use "null" as a value for much the same reason we do, and it seems best for us to pay the complexity cost of boxing than having everyone else do it. :-)
Flutter
Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.
See the getting started guide for information about using Flutter.