fab_scroll_animator

Add native Flutter animation to the FloatingActionButton when scrolling a ListView or GridView.

This package helps you automatically animate the FloatingActionButton between extended and collapsed states based on the user's scroll direction.

✨ Features

Automatically detects scroll direction (up/down)
Collapses the FAB when scrolling down
Expands the FAB when scrolling up or idle
Smooth transition using AnimatedContainer
Customizable collapsed width and animation duration
Compatible with ListView, GridView, or any scrollable widget

🎥 Demo

🚀 Getting Started

Add the dependency in your pubspec.yaml:

dependencies:
  fab_scroll_animator: ^1.0.0

Then import it:

import 'package:fab_scroll_animator/fab_scroll_animator.dart';

🧪 Example

final ScrollController scrollController = ScrollController();

Scaffold(
  body: ListView.builder(
    controller: scrollController,
    itemCount: 150,
    itemBuilder: (_, index) => ListTile(title: Text('LLLLoooonnnngggg Item \$index')),
  ),
  floatingActionButton: FABScrollAnimator(
    scrollController: scrollController,
    onScroll: (isExtended) {
      return FloatingActionButton.extended(
        isExtended: isExtended,
        onPressed: () {},
        label: Text('LLLLoooonnnngggg Text'),
        icon: Icon(Icons.add),
      );
    },
  ),
);

⚙️ Parameters

Parameter	Type	Description
`scrollController`	`ScrollController`	Controller attached to your scrollable widget
`onScroll`	`Widget Function(bool)`	Builder function called with `true` (extended) or `false` (collapsed)
`collapsedWidth`	`double`	Width of the FAB when collapsed (default: `55.0`)
`animationDuration`	`Duration`	Duration of the collapse/expand animation (default: `milliseconds: 300`)

📦 Other Packages

Package	Description
form_extensions	Simplifies form validation and saving using `.validator` and `.onSaved` extensions for all Flutter widgets.
listview_empty_builder	Adds a simple `.emptyBuilder` to ListView to handle empty states elegantly.

📄 License

This project is licensed under the MIT License. See the LICENSE file for details.