motion_segment 0.1.2

A highly customizable animated segmented button for Flutter with smooth sliding indicator animations.

motion_segment

A highly customizable animated segmented button for Flutter with a smooth sliding selection indicator.

Features

• Smooth sliding indicator animation between segments
• Four indicator animation styles: none, squish, bounce, stretch
• Horizontal and vertical layouts
• Per-state icon and label customization via WidgetStateProperty
• Customizable colors, border radius, margins, and spacing
• Custom animation duration and curve
• Light and dark theme support
• Supports Android, iOS, Web, Windows, macOS, and Linux

Installation

Add motion_segment to your pubspec.yaml:

dependencies:
  motion_segment: ^0.1.2

Then run:

flutter pub get

Basic Usage

import 'package:motion_segment/motion_segment.dart';

int _selectedIndex = 0;

SizedBox(
  height: 52,
  child: MotionSegment(
    selectedIndex: _selectedIndex,
    onChanged: (value) {
      setState(() => _selectedIndex = value);
    },
    backgroundColor: Colors.grey.shade200,
    indicatorAnimation: SegmentIndicatorAnimation.squish,
    selections: [
      MotionSegmentSelections(
        selectedColor: Colors.blue,
        label: WidgetStateProperty.resolveWith((states) => Text(
          'Day',
          style: TextStyle(
            color: states.contains(WidgetState.selected)
                ? Colors.white
                : Colors.black54,
          ),
        )),
      ),
      MotionSegmentSelections(
        selectedColor: Colors.blue,
        label: WidgetStateProperty.resolveWith((states) => Text(
          'Week',
          style: TextStyle(
            color: states.contains(WidgetState.selected)
                ? Colors.white
                : Colors.black54,
          ),
        )),
      ),
      MotionSegmentSelections(
        selectedColor: Colors.blue,
        label: WidgetStateProperty.resolveWith((states) => Text(
          'Month',
          style: TextStyle(
            color: states.contains(WidgetState.selected)
                ? Colors.white
                : Colors.black54,
          ),
        )),
      ),
    ],
  ),
)

Vertical Layout

SizedBox(
  height: 180,
  width: 64,
  child: MotionSegment(
    selectionDirection: SelectionDirection.vertical,
    selectedIndex: _selectedIndex,
    onChanged: (value) => setState(() => _selectedIndex = value),
    indicatorAnimation: SegmentIndicatorAnimation.bounce,
    selections: [
      MotionSegmentSelections(
        selectedColor: Colors.blue,
        icon: WidgetStateProperty.resolveWith((states) => Icon(
          Icons.home,
          color: states.contains(WidgetState.selected)
              ? Colors.white
              : Colors.black54,
        )),
      ),
      MotionSegmentSelections(
        selectedColor: Colors.blue,
        icon: WidgetStateProperty.resolveWith((states) => Icon(
          Icons.search,
          color: states.contains(WidgetState.selected)
              ? Colors.white
              : Colors.black54,
        )),
      ),
      MotionSegmentSelections(
        selectedColor: Colors.blue,
        icon: WidgetStateProperty.resolveWith((states) => Icon(
          Icons.person,
          color: states.contains(WidgetState.selected)
              ? Colors.white
              : Colors.black54,
        )),
      ),
    ],
  ),
)

MotionSegment Parameters

Parameter	Type	Default	Description
selections	List<MotionSegmentSelections>	required	The segments to display
onChanged	ValueChanged<int>?	null	Called when a segment is tapped
selectedIndex	int?	0	The initially selected segment index
selectionDirection	SelectionDirection?	horizontal	Axis of layout
indicatorAnimation	SegmentIndicatorAnimation?	null	Indicator animation style
backgroundColor	Color?	theme canvasColor	Background color
borderRadius	BorderRadiusGeometry?	circular(8)	Border radius
margins	double?	4.0	Padding around segments
selectionsSpacing	double?	0	Spacing between segments
animationDuration	Duration?	250ms	Animation duration
animationCurve	Curve?	easeInOutCubic	Animation curve

MotionSegmentSelections Parameters

Parameter	Type	Description
selectedColor	Color?	Indicator color when this segment is selected
icon	WidgetStateProperty<Widget?>?	Icon with per-state customization
label	WidgetStateProperty<Widget?>?	Label with per-state customization
hoverColor	Color?	Hover overlay color
mouseCursor	MouseCursor?	Cursor on hover, defaults to click

Indicator Animation Styles

Style	Description
none	Slides without shape change
squish	Squishes horizontally mid-slide
bounce	Overshoots and bounces on arrival
stretch	Stretches across segments during slide

Layout Constraints

MotionSegment expands to fill its parent's constraints. When used inside a Row, wrap with Expanded or give it an explicit width. When using vertical layout inside a Column, wrap with Expanded or give it an explicit height.

// Inside a Row
Row(
  children: [
    Expanded(child: MotionSegment(...)),
  ],
)

// Explicit size
SizedBox(
  height: 52,
  child: MotionSegment(...),
)

License

MIT