app_bar library

modify from https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/app_bar.dart lastest push: 2019.12.29 flutter v1.13.5

lastest commit: 2019.12.13 commit https://github.com/flutter/flutter/commit/d81d91606a47259d7f52f62fcc466c3aa3eb5f41 #45567 https://github.com/flutter/flutter/pull/45567

Classes

AppBar
A material design app bar. [...]
SliverAppBar
A material design app bar that integrates with a CustomScrollView. [...]