sparkle_scrollbar 0.0.2 
sparkle_scrollbar: ^0.0.2 copied to clipboard
A customizable GPU-accelerated particle and glow shader scrollbar for Flutter with multi-axis support and haptic feedback.
example/lib/main.dart
import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:sparkle_scrollbar/sparkle_scrollbar.dart';
void main() => runApp(const ExampleApp());
class ExampleApp extends StatelessWidget {
const ExampleApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: ThemeData.dark().copyWith(
scaffoldBackgroundColor:
const Color(0xFF050609), // Ultra deep space dark
),
home: const SparkleScrollStudioScreen(),
);
}
}
class SparkleScrollStudioScreen extends StatefulWidget {
const SparkleScrollStudioScreen({super.key});
@override
State<SparkleScrollStudioScreen> createState() =>
_SparkleScrollStudioScreenState();
}
class _SparkleScrollStudioScreenState extends State<SparkleScrollStudioScreen> {
// Infinite Hue Tuning (0.0 to 360.0 degrees)
double _hue = 210.0;
final double _saturation = 1.0;
final double _lightness = 0.55;
// Orientation & Tooltip state
bool _isHorizontal = false;
bool _showPercentageTooltip = true;
// Particle dynamics state
int _particleCount = 30;
double _particleSize = 0.065;
double _sparkSpeed = 1.2;
final double _sparkIntensity = 1.0;
ParticleShape _shape = ParticleShape.star;
final bool _colorShift = false;
// Thumb and Track geometry state
double _thumbThickness = 0.095;
int _gripNotches = 3;
bool _enableWave = true;
bool _showTrack = true;
final double _trackOpacity = 0.15;
// Physics, interaction, and input translation state
bool _useClassic = false;
final double _smoothness = 0.28;
final bool _enableHaptics = true;
bool _enableHorizontalMouseWheel = true;
ScrollbarAlignment _alignment = ScrollbarAlignment.right;
// Exact color calculations
Color get _currentExactColor =>
HSLColor.fromAHSL(1.0, _hue, _saturation, _lightness).toColor();
Color get _currentGlowColor => HSLColor.fromAHSL(
1.0,
_hue,
_saturation,
(_lightness + 0.2).clamp(0.0, 1.0),
).toColor();
Color get _currentSparkColor => HSLColor.fromAHSL(
1.0,
_hue,
(_saturation * 0.9).clamp(0.0, 1.0),
(_lightness + 0.35).clamp(0.0, 1.0),
).toColor();
// Reusable wrapper to apply the exact same SparkleScrollbar configuration
// to both the Main View and the BottomSheet.
Widget _buildSparkleWrapper({
required Widget child,
required Axis orientation,
required ScrollbarAlignment alignment,
}) {
return SparkleScrollbar(
orientation: orientation,
alignment: alignment,
renderMode: _useClassic
? ScrollbarRenderMode.classic
: ScrollbarRenderMode.shader,
margin: const EdgeInsets.symmetric(vertical: 8, horizontal: 4),
thumbConfig: ThumbConfig(
thickness: _thumbThickness,
color: _currentExactColor,
glowColor: _currentGlowColor,
gripNotchCount: _gripNotches,
enableWaveEffect: _enableWave,
),
particleConfig: ParticleConfig(
count: _particleCount,
minSize: _particleSize * 0.55,
maxSize: _particleSize,
speed: _sparkSpeed,
intensity: _sparkIntensity,
shape: _shape,
color: _currentSparkColor,
velocityShiftColor: _currentGlowColor,
enableColorShift: _colorShift,
),
trackConfig: TrackConfig(
showTrack: _showTrack,
opacity: _trackOpacity,
color: _currentExactColor,
),
tooltipConfig: ScrollTooltipConfig.percentage(
mode: _showPercentageTooltip
? ScrollbarTooltipMode.alwaysOnScroll
: ScrollbarTooltipMode.none,
backgroundColor: const Color(0xFF151928),
textColor: _currentGlowColor,
),
physicsConfig: ScrollPhysicsConfig(
enableHaptics: _enableHaptics,
smoothness: _smoothness,
enableHorizontalMouseWheel: _enableHorizontalMouseWheel,
),
child: child,
);
}
@override
Widget build(BuildContext context) {
final activeColor = _currentExactColor;
return Scaffold(
body: Stack(
children: [
// 1. Main Scrollable Content wrapped in the Sparkle Wrapper
Positioned.fill(
child: _buildSparkleWrapper(
orientation: _isHorizontal ? Axis.horizontal : Axis.vertical,
alignment: _alignment,
child: ListView.builder(
scrollDirection:
_isHorizontal ? Axis.horizontal : Axis.vertical,
itemCount: 80,
physics: const BouncingScrollPhysics(),
padding: const EdgeInsets.fromLTRB(20, 120, 20, 40),
itemBuilder: (context, index) => Container(
width: _isHorizontal ? 280 : null,
margin: EdgeInsets.only(
bottom: _isHorizontal ? 0 : 16,
right: _isHorizontal ? 16 : 0,
),
padding: const EdgeInsets.all(24),
decoration: BoxDecoration(
color: const Color(0xFF0C0E14),
borderRadius: BorderRadius.circular(24),
border: Border.all(
color: activeColor.withValues(alpha: 0.15),
width: 1.5,
),
boxShadow: [
BoxShadow(
color: activeColor.withValues(alpha: 0.05),
blurRadius: 20,
offset: const Offset(0, 8),
),
],
),
child: Row(
children: [
Container(
padding: const EdgeInsets.all(14),
decoration: BoxDecoration(
color: activeColor.withValues(alpha: 0.1),
borderRadius: BorderRadius.circular(16),
),
child: Icon(
_isHorizontal
? Icons.horizontal_distribute_rounded
: Icons.layers_rounded,
color: activeColor,
size: 28,
),
),
const SizedBox(width: 20),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
"Cosmic Block ${index + 1}",
style: const TextStyle(
fontWeight: FontWeight.w900,
fontSize: 17,
color: Colors.white,
letterSpacing: 0.5,
),
),
const SizedBox(height: 6),
Text(
"Interact to trigger particles",
style: TextStyle(
color: Colors.white.withValues(alpha: 0.4),
fontSize: 12,
),
),
],
),
),
],
),
),
),
),
),
// 2. Floating App Bar (Glassmorphism Effect)
Positioned(
top: 0,
left: 0,
right: 0,
child: ClipRRect(
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: 12, sigmaY: 12),
child: Container(
padding: EdgeInsets.only(
top: MediaQuery.of(context).padding.top + 10,
bottom: 20,
left: 24,
right: 24,
),
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors: [
const Color(0xFF050609).withValues(alpha: 0.9),
const Color(0xFF050609).withValues(alpha: 0.0),
],
),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
Icon(Icons.blur_on_rounded,
color: activeColor, size: 32),
const SizedBox(width: 12),
const Text(
"Sparkle UI",
style: TextStyle(
fontWeight: FontWeight.w900,
fontSize: 22,
letterSpacing: 1.0,
),
),
],
),
IconButton.filled(
style: IconButton.styleFrom(
backgroundColor: activeColor.withValues(alpha: 0.15),
foregroundColor: activeColor,
padding: const EdgeInsets.all(12),
),
icon: const Icon(Icons.tune_rounded),
onPressed: () => _openInspector(context),
),
],
),
),
),
),
),
],
),
);
}
void _openInspector(BuildContext context) {
showModalBottomSheet(
context: context,
isScrollControlled: true,
backgroundColor: Colors.transparent,
builder: (ctx) {
return StatefulBuilder(
builder: (ctx, setSheetState) {
// Helper function to update both the sheet and the main view
void update(VoidCallback fn) {
setSheetState(fn);
setState(fn);
}
final activeColor = _currentExactColor;
return DraggableScrollableSheet(
initialChildSize: 0.85,
maxChildSize: 0.95,
minChildSize: 0.5,
builder: (ctx, scrollController) {
return Container(
decoration: BoxDecoration(
color: const Color(0xFF0B0C10),
borderRadius:
const BorderRadius.vertical(top: Radius.circular(32)),
border: Border(
top: BorderSide(
color: activeColor.withValues(alpha: 0.3), width: 2),
),
),
// Applying Sparkle Scrollbar to the Settings Menu
child: _buildSparkleWrapper(
orientation: Axis.vertical,
alignment: ScrollbarAlignment.right,
child: ListView(
controller: scrollController,
padding: const EdgeInsets.fromLTRB(24, 16, 24, 40),
children: [
Center(
child: Container(
width: 40,
height: 4,
margin: const EdgeInsets.only(bottom: 24),
decoration: BoxDecoration(
color: Colors.white.withValues(alpha: 0.2),
borderRadius: BorderRadius.circular(10),
),
),
),
Text(
"Studio Settings",
style: TextStyle(
fontSize: 28,
fontWeight: FontWeight.w900,
color: activeColor,
letterSpacing: -0.5,
),
),
const SizedBox(height: 4),
Text(
"Fine-tune every GPU shader and physics aspect.",
style: TextStyle(
fontSize: 14,
color: Colors.white.withValues(alpha: 0.5),
),
),
const SizedBox(height: 32),
_buildSectionHeader("1. GENERAL & COLOR", Icons.palette,
Colors.greenAccent),
// Advanced Hue Selection Tile inside Settings
Container(
margin: const EdgeInsets.only(bottom: 12),
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: const Color(0xFF13151D),
borderRadius: BorderRadius.circular(24),
border: Border.all(
color: Colors.white.withValues(alpha: 0.05)),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: [
const Text(
"Accent Hue",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 15),
),
Container(
width: 16,
height: 16,
decoration: BoxDecoration(
color: activeColor,
shape: BoxShape.circle,
boxShadow: [
BoxShadow(
color: activeColor.withValues(
alpha: 0.8),
blurRadius: 10,
),
],
),
),
],
),
const SizedBox(height: 8),
Text(
"Slide to completely change the app aesthetic.",
style: TextStyle(
fontSize: 12,
color: Colors.white.withValues(alpha: 0.4),
height: 1.5,
),
),
const SizedBox(height: 16),
Container(
height: 12,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(6),
gradient: const LinearGradient(
colors: [
Color(0xFFFF0000),
Color(0xFFFFFF00),
Color(0xFF00FF00),
Color(0xFF00FFFF),
Color(0xFF0000FF),
Color(0xFFFF00FF),
Color(0xFFFF0000),
],
),
),
child: SliderTheme(
data: SliderTheme.of(context).copyWith(
trackHeight: 12,
activeTrackColor: Colors.transparent,
inactiveTrackColor: Colors.transparent,
thumbColor: Colors.white,
thumbShape: const RoundSliderThumbShape(
enabledThumbRadius: 8,
elevation: 4,
),
overlayColor:
Colors.white.withValues(alpha: 0.2),
),
child: Slider(
min: 0.0,
max: 360.0,
value: _hue,
onChanged: (v) => update(() => _hue = v),
),
),
),
],
),
),
_buildSwitchDocTile(
title: "Horizontal Main Axis",
description:
"Switch the main view to scroll horizontally.",
value: _isHorizontal,
activeColor: activeColor,
onChanged: (v) => update(() {
_isHorizontal = v;
_alignment = v
? ScrollbarAlignment.bottom
: ScrollbarAlignment.right;
}),
),
const SizedBox(height: 32),
_buildSectionHeader("2. TOOLTIPS",
Icons.chat_bubble_outline, Colors.cyanAccent),
_buildSwitchDocTile(
title: "Show Percentage Bubble",
description:
"Enables or disables the floating percentage indicator.",
value: _showPercentageTooltip,
activeColor: activeColor,
onChanged: (v) =>
update(() => _showPercentageTooltip = v),
),
const SizedBox(height: 32),
_buildSectionHeader("3. PARTICLES", Icons.auto_awesome,
Colors.purpleAccent),
_buildDocTile(
title: "Particle Shape",
description:
"GLSL mathematical geometry rendering shapes.",
control: DropdownButton<ParticleShape>(
value: _shape,
dropdownColor: const Color(0xFF13151D),
borderRadius: BorderRadius.circular(16),
underline: const SizedBox.shrink(),
icon: Icon(Icons.keyboard_arrow_down,
color: activeColor),
items: ParticleShape.values.map((s) {
return DropdownMenuItem(
value: s,
child: Text(
s.name.toUpperCase(),
style: TextStyle(
color: activeColor,
fontWeight: FontWeight.bold),
),
);
}).toList(),
onChanged: (v) => update(() => _shape = v!),
),
),
_buildSliderDocTile(
title: "Particle Count",
description:
"Number of sparks emitting from the thumb.",
val: _particleCount.toDouble(),
min: 0,
max: 50,
activeColor: activeColor,
displayVal: "$_particleCount",
onChanged: (v) =>
update(() => _particleCount = v.round()),
),
_buildSliderDocTile(
title: "Particle Size",
description: "Diameter scale of the sparks and aura.",
val: _particleSize,
min: 0.02,
max: 0.14,
activeColor: activeColor,
displayVal: "${(_particleSize * 100).toInt()}%",
onChanged: (v) => update(() => _particleSize = v),
),
_buildSliderDocTile(
title: "Emission Speed",
description: "Speed multiplier launching particles.",
val: _sparkSpeed,
min: 0.5,
max: 3.0,
activeColor: activeColor,
displayVal: "${_sparkSpeed.toStringAsFixed(1)}x",
onChanged: (v) => update(() => _sparkSpeed = v),
),
const SizedBox(height: 32),
_buildSectionHeader("4. GEOMETRY", Icons.architecture,
Colors.amberAccent),
_buildSliderDocTile(
title: "Thumb Thickness",
description:
"Thickness radius of the scrollbar thumb.",
val: _thumbThickness,
min: 0.05,
max: 0.16,
activeColor: activeColor,
displayVal: "${(_thumbThickness * 100).toInt()}%",
onChanged: (v) => update(() => _thumbThickness = v),
),
_buildDocTile(
title: "Grip Notches",
description:
"Tactile mechanical ridges carved into the thumb.",
control: SegmentedButton<int>(
style: SegmentedButton.styleFrom(
selectedBackgroundColor:
activeColor.withValues(alpha: 0.2),
selectedForegroundColor: activeColor,
),
segments: const [
ButtonSegment(value: 0, label: Text("0")),
ButtonSegment(value: 1, label: Text("1")),
ButtonSegment(value: 3, label: Text("3")),
],
selected: {_gripNotches},
onSelectionChanged: (set) =>
update(() => _gripNotches = set.first),
),
),
_buildSwitchDocTile(
title: "Traveling Light Wave",
description:
"Animated pulse along the body of the thumb.",
value: _enableWave,
activeColor: activeColor,
onChanged: (v) => update(() => _enableWave = v),
),
_buildSwitchDocTile(
title: "Show Track",
description: "Draws a recessed groove track behind.",
value: _showTrack,
activeColor: activeColor,
onChanged: (v) => update(() => _showTrack = v),
),
const SizedBox(height: 32),
_buildSectionHeader("5. SYSTEM",
Icons.settings_system_daydream, Colors.pinkAccent),
_buildSwitchDocTile(
title: "Horiz. Mouse Wheel",
description:
"Translates standard vertical mouse wheel.",
value: _enableHorizontalMouseWheel,
activeColor: activeColor,
onChanged: (v) =>
update(() => _enableHorizontalMouseWheel = v),
),
_buildSwitchDocTile(
title: "Classic Canvas Mode",
description:
"Lightweight fallback without GPU shader.",
value: _useClassic,
activeColor: activeColor,
onChanged: (v) => update(() => _useClassic = v),
),
_buildDocTile(
title: "Alignment",
description: "Positions the scrollbar along borders.",
control: DropdownButton<ScrollbarAlignment>(
value: _alignment,
dropdownColor: const Color(0xFF13151D),
borderRadius: BorderRadius.circular(16),
underline: const SizedBox.shrink(),
icon: Icon(Icons.keyboard_arrow_down,
color: activeColor),
items: ScrollbarAlignment.values.map((a) {
return DropdownMenuItem(
value: a,
child: Text(
a.name.toUpperCase(),
style: const TextStyle(
fontWeight: FontWeight.bold),
),
);
}).toList(),
onChanged: (v) => update(() => _alignment = v!),
),
),
],
),
),
);
},
);
},
);
},
);
}
Widget _buildSectionHeader(String title, IconData icon, Color color) {
return Padding(
padding: const EdgeInsets.only(bottom: 16),
child: Row(
children: [
Icon(icon, size: 18, color: color),
const SizedBox(width: 8),
Text(
title,
style: TextStyle(
fontSize: 13,
fontWeight: FontWeight.w900,
color: color,
letterSpacing: 1.5,
),
),
],
),
);
}
Widget _buildDocTile({
required String title,
required String description,
required Widget control,
}) {
return Container(
margin: const EdgeInsets.only(bottom: 12),
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: const Color(0xFF13151D),
borderRadius: BorderRadius.circular(24),
border: Border.all(color: Colors.white.withValues(alpha: 0.05)),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
title,
style:
const TextStyle(fontWeight: FontWeight.bold, fontSize: 15),
),
control,
],
),
const SizedBox(height: 8),
Text(
description,
style: TextStyle(
fontSize: 12,
color: Colors.white.withValues(alpha: 0.4),
height: 1.5,
),
),
],
),
);
}
Widget _buildSliderDocTile({
required String title,
required String description,
required double val,
required double min,
required double max,
required Color activeColor,
required String displayVal,
required ValueChanged<double> onChanged,
}) {
return Container(
margin: const EdgeInsets.only(bottom: 12),
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: const Color(0xFF13151D),
borderRadius: BorderRadius.circular(24),
border: Border.all(color: Colors.white.withValues(alpha: 0.05)),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
title,
style:
const TextStyle(fontWeight: FontWeight.bold, fontSize: 15),
),
Text(
displayVal,
style: TextStyle(
fontWeight: FontWeight.w900,
fontSize: 14,
color: activeColor,
),
),
],
),
const SizedBox(height: 8),
Text(
description,
style: TextStyle(
fontSize: 12,
color: Colors.white.withValues(alpha: 0.4),
height: 1.5,
),
),
const SizedBox(height: 16),
SliderTheme(
data: SliderTheme.of(context).copyWith(
trackHeight: 4,
thumbShape: const RoundSliderThumbShape(enabledThumbRadius: 8),
overlayShape: const RoundSliderOverlayShape(overlayRadius: 16),
),
child: Slider(
value: val.clamp(min, max),
min: min,
max: max,
activeColor: activeColor,
inactiveColor: activeColor.withValues(alpha: 0.2),
onChanged: onChanged,
),
),
],
),
);
}
Widget _buildSwitchDocTile({
required String title,
required String description,
required bool value,
required Color activeColor,
required ValueChanged<bool> onChanged,
}) {
return Container(
margin: const EdgeInsets.only(bottom: 12),
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: const Color(0xFF13151D),
borderRadius: BorderRadius.circular(24),
border: Border.all(color: Colors.white.withValues(alpha: 0.05)),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
title,
style:
const TextStyle(fontWeight: FontWeight.bold, fontSize: 15),
),
Switch(
value: value,
activeColor: activeColor,
onChanged: onChanged,
),
],
),
const SizedBox(height: 4),
Text(
description,
style: TextStyle(
fontSize: 12,
color: Colors.white.withValues(alpha: 0.4),
height: 1.5,
),
),
],
),
);
}
}Metadata
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Metadata
A customizable GPU-accelerated particle and glow shader scrollbar for Flutter with multi-axis support and haptic feedback.
Repository (GitHub)
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unknown (license)