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flutter_expandable_fab

pub package

English, 日本語

flutter_expandable_fab is a speed dial FAB (Floating Action Button) that can animate the display and hiding of multiple action buttons.
It can be configured to display vertically, horizontally, or in a fan-shaped manner, on either side. It allows for fine-grained customization.

Migration from 1.x to 2.x

In version 2.x, I have made changes to enable free customization of the open/close buttons by setting builders.

Code before migration:

ExpandableFab(
  child: const Icon(Icons.account_box),
  foregroundColor: Colors.amber,
  backgroundColor: Colors.green,
  closeButtonStyle: const ExpandableFabCloseButtonStyle(
    child: Icon(Icons.abc),
    foregroundColor: Colors.deepOrangeAccent,
    backgroundColor: Colors.lightGreen,
  )
  expandedFabSize: ExpandedFabSize.small,
  collapsedFabSize: ExpandableFabSize.regular,
  expandedFabShape: const CircleBorder(),
  collapsedFabShape: const CircleBorder(),
)

Code after migration:

ExpandableFab(
  openButtonBuilder: RotateFloatingActionButtonBuilder(
    child: const Icon(Icons.account_box),
    fabSize: ExpandableFabSize.regular,
    foregroundColor: Colors.amber,
    backgroundColor: Colors.green,
    shape: const CircleBorder(),
  ),
  closeButtonBuilder: DefaultFloatingActionButtonBuilder(
    child: const Icon(Icons.close),
    fabSize: ExpandableFabSize.small,
    foregroundColor: Colors.deepOrangeAccent,
    backgroundColor: Colors.lightGreen,
    shape: const CircleBorder(),
  ),
)

Showcase

Fan style & Blur overlay

Vertical style & Color overlay

Horizontal style & Custom buttons

Getting started

import 'package:flutter_expandable_fab/flutter_expandable_fab.dart';

Scaffold(
  floatingActionButtonLocation: ExpandableFab.location,
  floatingActionButton: ExpandableFab(
    children: [
      FloatingActionButton.small(
        heroTag: null,
        child: const Icon(Icons.edit),
        onPressed: () {},
      ),
      FloatingActionButton.small(
        heroTag: null,
        child: const Icon(Icons.search),
        onPressed: () {},
      ),
    ],
  ),
),

Open/Close programmatically

class _FirstPageState extends State<FirstPage> {
  final _key = GlobalKey<ExpandableFabState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButtonLocation: ExpandableFab.location,
      floatingActionButton: ExpandableFab(
        key: _key,
        children: [
          FloatingActionButton.small(
            child: const Icon(Icons.edit),
            onPressed: () {
              final state = _key.currentState;
              if (state != null) {
                debugPrint('isOpen:${state.isOpen}');
                state.toggle();
              }
            },
          ),
        ],
      ),
    );
  }
}

Customize

You can customize the open/close buttons with your preferred Widget using FloatingActionButtonBuilder. By using DefaultFloatingActionButtonBuilder, you can easily set up the FloatingActionButton. RotateFloatingActionButtonBuilder provides a FloatingActionButton with a rotating animation. Also, the items specified in children don't necessarily have to be FloatingActionButton; you can set any Widget freely.

ExpandableFab(
  openButtonBuilder: RotateFloatingActionButtonBuilder(
    child: const Icon(Icons.account_box),
    fabSize: ExpandableFabSize.regular,
    foregroundColor: Colors.amber,
    backgroundColor: Colors.green,
    shape: const CircleBorder(),
  ),
  closeButtonBuilder: FloatingActionButtonBuilder(
    size: 56,
    builder: (BuildContext context, void Function()? onPressed,
        Animation<double> progress) {
      return IconButton(
        onPressed: onPressed,
        icon: const Icon(
          Icons.check_circle_outline,
          size: 40,
        ),
      );
    },
  ),
  children: [
    FloatingActionButton.large(
      heroTag: null,
      child: const Icon(Icons.edit),
      onPressed: () {},
    ),
    IconButton(
      onPressed: () {
        final state = _key.currentState;
        if (state != null) {
          debugPrint('isOpen:${state.isOpen}');
          state.toggle();
        }
      },
      icon: const Icon(
        Icons.share,
        size: 30,
      ),
    ),
  ],
)

Since children is an array of widgets, you can place any widget you like, not limited to FloatingActionButton.
You can also create buttons with labels as shown below.

floatingActionButton: ExpandableFab(
  key: _key,
  type: ExpandableFabType.up,
  childrenAnimation: ExpandableFabAnimation.none,
  distance: 70,
  overlayStyle: ExpandableFabOverlayStyle(
    color: Colors.white.withOpacity(0.9),
  ),
  children: const [
    Row(
      children: [
        Text('Remind'),
        SizedBox(width: 20),
        FloatingActionButton.small(
          heroTag: null,
          onPressed: null,
          child: Icon(Icons.notifications),
        ),
      ],
    ),
    Row(
      children: [
        Text('Email'),
        SizedBox(width: 20),
        FloatingActionButton.small(
          heroTag: null,
          onPressed: null,
          child: Icon(Icons.email),
        ),
      ],
    ),
    Row(
      children: [
        Text('Star'),
        SizedBox(width: 20),
        FloatingActionButton.small(
          heroTag: null,
          onPressed: null,
          child: Icon(Icons.star),
        ),
      ],
    ),
    FloatingActionButton.small(
      heroTag: null,
      onPressed: null,
      child: Icon(Icons.add),
    ),
  ],
),

Properties

ExpandableFab

Property Description Default
distance Distance from children 100
duration Animation duration 250ms
fanAngle Angle of opening when fan type 90
initialOpen Open at initial display false
type The type of behavior of this widget fan
pos Position for displaying the widget right
closeButtonBuilder Builder for the close button
openButtonBuilder Builder for the open button
childrenOffset For positioning of children widgets
childrenAnimation Types of animations for Children rotate
children The widgets below this widget in the tree
onOpen Will be called before opening the menu
afterOpen Will be called after opening the menu
onClose Will be called before the menu closes
afterClose Will be called after the menu closes
overlayStyle Provides the style for overlay. No overlay when null.

FloatingActionButtonBuilder

Property Description Default
builder Callback to build the Widget
size Size of the Widget

DefaultFloatingActionButtonBuilder

Property Description Default
fabSize Size of the button regular
foregroundColor Foreground color of the button
backgroundColor Background color of the button
shape Shape of the close button
heroTag Tag to apply to the [Hero] widget of the button
child Child widget of the button

RotateFloatingActionButtonBuilder

Property Description Default
angle Angle of rotation (in radians) math.pi / 2
... Same as DefaultFloatingActionButtonBuilder

Thanks

I referred to the code from this article: https://docs.flutter.dev/cookbook/effects/expandable-fab

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