可隐藏的

hidable

Use this package as a library

Run this command with Flutter:

 $ flutter pub add hidable

This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dependencies:
  hidable: ^1.0.6

To start using Hidable widget, we have to create a ScrollController. inctance before.

final ScrollController scrollController = ScrollController();

As case of usage, we should have one scrollable widget (SingleChildScrollView, ListView etc) and one static located widget (AppBar, BottomNavigationBar, FloatingActionButton and etc) which would be wrapped with Hidable widget.

So, scrollController which we created before must be given to each one (scrollable widget and static located hidable widget).

Scrollable widget

ListView.separated(
  // General scroll controller which makes bridge between
  // This ListView and Hidable widget.
  controller: scrollController,
  itemCount: colors.length,
  itemBuilder: (_, i) => Container(
     height: 50,
     color: colors[i].withOpacity(.6),
  ),
  separatorBuilder: (_, __) => const SizedBox(height: 10),
),

Static located hidable widget

Hidable(
  controller: scrollController,
  enableOpacityAnimation: true, // optional, defaults to `true`.
  child: BottomNavigationBar(...),
),

That is the common usage of hidable, and also you can find full code implmenetation of hidable at official example page.