diagonal_wipe_icon 0.1.0 
diagonal_wipe_icon: ^0.1.0 copied to clipboard
Polished wipe-style icon transitions for Flutter with diagonal, horizontal, and vertical directions.
example/lib/main.dart
import 'dart:async' as async;
import 'dart:math' as math;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/physics.dart';
import 'package:diagonal_wipe_icon/diagonal_wipe_icon.dart';
import 'package:material_symbols_icons/symbols.dart';
import 'package:url_launcher/url_launcher.dart';
import 'demo_catalog.dart';
import 'src/ui_constants.dart';
extension _MaterialColorSchemeCompat on ColorScheme {
Color get appOnBackground => onSurface;
Color get appSurfaceVariant => surfaceContainerHighest;
}
const _howItWorksDirectionOptions = [
(
direction: WipeDirection.topLeftToBottomRight,
label: 'Top-left to bottom-right',
),
(
direction: WipeDirection.topRightToBottomLeft,
label: 'Top-right to bottom-left',
),
(
direction: WipeDirection.bottomLeftToTopRight,
label: 'Bottom-left to top-right',
),
(
direction: WipeDirection.bottomRightToTopLeft,
label: 'Bottom-right to top-left',
),
(direction: WipeDirection.topToBottom, label: 'Top to bottom'),
(direction: WipeDirection.bottomToTop, label: 'Bottom to top'),
(direction: WipeDirection.leftToRight, label: 'Left to right'),
(direction: WipeDirection.rightToLeft, label: 'Right to left'),
];
const String _howItWorksPairLabel = 'Power';
final _howItWorksDirectionLabels = {
for (final option in _howItWorksDirectionOptions)
option.direction: option.label,
};
typedef IconTapCallback = void Function(MaterialWipeIconPair pair);
double _composeDialogMaxWidth(BuildContext context) {
final viewportWidth = MediaQuery.sizeOf(context).width;
final availableWidth = math.max(0.0, viewportWidth - 32.0);
// Compose Android Dialog uses a platform-default width; Surface then uses fillMaxWidth(0.94f).
final platformDialogWidth = math.min(availableWidth, 560.0);
return platformDialogWidth * 0.94;
}
Future<void> _animateScaleWithSpring(
AnimationController controller,
double target, {
double stiffness = 200,
double dampingRatio = 0.5,
}) {
final clampedTarget =
target.clamp(controller.lowerBound, controller.upperBound);
if (clampedTarget == controller.value) {
return Future.value();
}
controller.stop();
final spring = SpringDescription.withDampingRatio(
mass: 1,
stiffness: stiffness,
ratio: dampingRatio,
);
return controller.animateWith(
SpringSimulation(
spring,
controller.value,
clampedTarget,
controller.velocity,
),
);
}
void main() {
WidgetsFlutterBinding.ensureInitialized();
runApp(const DiagonalWipeIconFlutterApp());
}
class DiagonalWipeIconFlutterApp extends StatefulWidget {
const DiagonalWipeIconFlutterApp({super.key});
@override
State<DiagonalWipeIconFlutterApp> createState() =>
_DiagonalWipeIconFlutterAppState();
}
class _DiagonalWipeIconFlutterAppState extends State<DiagonalWipeIconFlutterApp>
with TickerProviderStateMixin {
final GlobalKey<NavigatorState> _rootNavigatorKey =
GlobalKey<NavigatorState>();
bool _showIntro = false;
bool _isLooping = false;
bool _isLoopWiped = false;
bool _isDark =
WidgetsBinding.instance.platformDispatcher.platformBrightness ==
Brightness.dark;
double _globalAnimationMultiplier = 1.0;
int _selectedSeedIndex = 3;
bool _showHowItWorks = false;
WipeDirection _howItWorksDirection = WipeDirection.topLeftToBottomRight;
MaterialWipeIconPair? _heroSelectedIcon;
double _scrollProgress = 0;
int _loopToken = 0;
final ScrollController _catalogScrollController = ScrollController();
async.Timer? _introDelay;
async.Timer? _toolbarDelay;
late final AnimationController _toolbarIntroController = AnimationController(
vsync: this,
duration: const Duration(milliseconds: 400),
);
@override
void initState() {
super.initState();
_introDelay = async.Timer(const Duration(milliseconds: 150), () {
if (!mounted) return;
setState(() => _showIntro = true);
_toolbarDelay = async.Timer(const Duration(milliseconds: 600), () {
if (!mounted) return;
if (_toolbarIntroController.status == AnimationStatus.dismissed) {
_toolbarIntroController.forward();
}
});
});
}
@override
void dispose() {
_loopToken++;
_introDelay?.cancel();
_toolbarDelay?.cancel();
_toolbarIntroController.dispose();
_catalogScrollController.dispose();
super.dispose();
}
void _startLoop() {
_loopToken++;
final int token = _loopToken;
if (!_isLooping) {
setState(() => _isLoopWiped = false);
return;
}
_runLoop(token);
}
Future<void> _runLoop(int token) async {
while (mounted && _isLooping && token == _loopToken) {
setState(() => _isLoopWiped = true);
final int enableDelay = autoPlayDelay(
wipeInDurationMillis,
_globalAnimationMultiplier,
);
await Future<void>.delayed(Duration(milliseconds: enableDelay));
if (!mounted || token != _loopToken || !_isLooping) break;
setState(() => _isLoopWiped = false);
final int disableDelay = autoPlayDelay(
wipeOutDurationMillis,
_globalAnimationMultiplier,
);
await Future<void>.delayed(Duration(milliseconds: disableDelay));
if (!mounted || token != _loopToken || !_isLooping) break;
}
if (mounted && token == _loopToken) {
setState(() => _isLoopWiped = false);
}
}
void _toggleLoop(bool value) {
setState(() {
_isLooping = value;
});
if (!_isLooping) {
_startLoop();
return;
}
_startLoop();
}
void _toggleSlowMode() {
setState(() {
_globalAnimationMultiplier =
_globalAnimationMultiplier == 1.0 ? slowAnimationMultiplier : 1.0;
});
if (_isLooping) _startLoop();
}
void _selectSeed(int index) {
if (index == _selectedSeedIndex) return;
setState(() => _selectedSeedIndex = index);
}
void _openHowItWorksDialog() {
if (_showHowItWorks) return;
final BuildContext? navContext = _rootNavigatorKey.currentContext;
if (_showHowItWorks || !mounted || navContext == null) return;
final pair = materialSymbolPairByLabel(_howItWorksPairLabel) ??
coreMaterialWipeIconCatalog.first;
if (!mounted) return;
setState(() => _showHowItWorks = true);
showDialog<void>(
context: navContext,
useRootNavigator: true,
builder: (_) => HowItWorksDialog(
onDirectionChanged: (value) {
if (mounted) {
setState(() => _howItWorksDirection = value);
}
},
initialDirection: _howItWorksDirection,
pair: pair,
),
).then((_) {
if (mounted) {
setState(() => _showHowItWorks = false);
}
});
}
void _openIconPreviewDialog(MaterialWipeIconPair pair) {
final BuildContext? navContext = _rootNavigatorKey.currentContext;
if (!mounted || navContext == null) return;
showDialog<void>(
context: navContext,
useRootNavigator: true,
builder: (_) => IconPreviewDialog(
iconPair: pair,
baseAnimationMultiplier: _globalAnimationMultiplier,
),
);
}
Future<void> _openUrl(String link) async {
final uri = Uri.parse(link);
if (await canLaunchUrl(uri)) {
await launchUrl(uri, mode: LaunchMode.externalApplication);
}
}
@override
Widget build(BuildContext context) {
final selectedSeed = themeSeedOptions[_selectedSeedIndex];
final theme = ThemeData(
useMaterial3: true,
colorScheme: ColorScheme.fromSeed(
seedColor: selectedSeed.color,
brightness: _isDark ? Brightness.dark : Brightness.light,
dynamicSchemeVariant: selectedSeed.style == ThemeSeedStyle.expressive
? DynamicSchemeVariant.expressive
: DynamicSchemeVariant.neutral,
),
);
return MaterialApp(
navigatorKey: _rootNavigatorKey,
title: 'Diagonal Wipe Icon',
debugShowCheckedModeBanner: false,
theme: theme,
themeAnimationDuration: const Duration(milliseconds: 450),
themeAnimationCurve: Curves.easeInOutCubic,
home: Stack(
fit: StackFit.expand,
children: [
AnimatedMeshBackground(
seedColor: selectedSeed.color,
isDark: _isDark,
),
Scaffold(
backgroundColor: Colors.transparent,
appBar: AnimatedTopBar(
scrollTitleAlpha: _scrollProgress,
isDark: _isDark,
onToggleDark: () => setState(() => _isDark = !_isDark),
onOpenX: () => _openUrl('https://x.com/bernaferrari'),
onOpenGitHub: () => _openUrl(
'https://github.com/bernaferrari/diagonal-wipe-icon'),
),
body: Stack(
fit: StackFit.expand,
children: [
_ScaffoldContent(
introVisible: _showIntro,
onHeroIconTap: (pair) =>
setState(() => _heroSelectedIcon = pair),
animationMultiplier: _globalAnimationMultiplier,
allIconsWiped: _isLoopWiped,
isLooping: _isLooping,
onScrollProgressChanged: (value) =>
setState(() => _scrollProgress = value),
heroSelectedIcon: _heroSelectedIcon,
onHeroSelectedIconConsumed: () =>
setState(() => _heroSelectedIcon = null),
onIconTap: (pair) => _openIconPreviewDialog(pair),
scrollController: _catalogScrollController,
scrollTitleAlpha: _scrollProgress,
selectedSeed: selectedSeed,
onOpenHowItWorks: _openHowItWorksDialog,
),
Positioned(
left: 0,
right: 0,
bottom: 0,
child: AnimatedBuilder(
animation: _toolbarIntroController,
builder: (context, _) {
final interactive = _toolbarIntroController.value > 0.001;
return IgnorePointer(
ignoring: !interactive,
child: SafeArea(
minimum: const EdgeInsets.only(bottom: 16),
child: FadeTransition(
opacity: _toolbarIntroController,
child: SlideTransition(
position: Tween<Offset>(
begin: const Offset(0, 0.3),
end: Offset.zero,
).animate(_toolbarIntroController),
child: Center(
child: BottomToolbar(
themeSeedOptions: themeSeedOptions,
selectedSeedIndex: _selectedSeedIndex,
onSeedSelected: _selectSeed,
isSlowMode: _globalAnimationMultiplier > 1,
onToggleSlowMode: _toggleSlowMode,
isLooping: _isLooping,
onToggleLoop: _toggleLoop,
),
),
),
),
),
);
},
),
),
],
),
),
],
),
);
}
}
class _ScaffoldContent extends StatefulWidget {
const _ScaffoldContent({
required this.introVisible,
required this.onHeroIconTap,
required this.animationMultiplier,
required this.allIconsWiped,
required this.isLooping,
required this.onScrollProgressChanged,
required this.heroSelectedIcon,
required this.onHeroSelectedIconConsumed,
required this.scrollController,
required this.onIconTap,
required this.scrollTitleAlpha,
required this.selectedSeed,
required this.onOpenHowItWorks,
});
final bool introVisible;
final ValueChanged<MaterialWipeIconPair> onHeroIconTap;
final double animationMultiplier;
final bool allIconsWiped;
final bool isLooping;
final ValueChanged<double> onScrollProgressChanged;
final MaterialWipeIconPair? heroSelectedIcon;
final VoidCallback onHeroSelectedIconConsumed;
final ScrollController scrollController;
final IconTapCallback onIconTap;
final double scrollTitleAlpha;
final ThemeSeed selectedSeed;
final VoidCallback onOpenHowItWorks;
@override
State<_ScaffoldContent> createState() => _ScaffoldContentState();
}
class _ScaffoldContentState extends State<_ScaffoldContent>
with TickerProviderStateMixin {
late final AnimationController _introController = AnimationController(
vsync: this,
duration: const Duration(milliseconds: 1000),
);
double _lastScrollProgress = 0;
double? _lastScrollOffset;
@override
void initState() {
super.initState();
_lastScrollProgress = widget.scrollTitleAlpha;
_introController.value = widget.introVisible ? 1 : 0;
}
@override
void didUpdateWidget(covariant _ScaffoldContent oldWidget) {
super.didUpdateWidget(oldWidget);
if (oldWidget.scrollTitleAlpha != widget.scrollTitleAlpha) {
_lastScrollProgress = widget.scrollTitleAlpha;
}
if (widget.introVisible && !oldWidget.introVisible) {
_introController.forward();
} else if (!widget.introVisible && oldWidget.introVisible) {
_introController.reverse();
}
}
@override
void dispose() {
_introController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
final heroIntro = _introController.drive(
Tween<double>(
begin: 0.0,
end: 1.0,
).chain(
CurveTween(
curve: Curves.easeOutCubic,
),
),
);
final heroSlide = Tween<Offset>(
begin: const Offset(0, 0.25),
end: Offset.zero,
).animate(heroIntro);
return NotificationListener<ScrollNotification>(
onNotification: (notification) {
if (notification.metrics.axis != Axis.vertical) return false;
final quantized =
(notification.metrics.pixels / uiScrollProgressOffsetPx)
.clamp(0.0, 1.0)
.toDouble();
final clamped =
(quantized * uiScrollProgressQuantizationSteps).floor() /
uiScrollProgressQuantizationSteps;
final currentOffset = notification.metrics.pixels;
if (_lastScrollOffset == currentOffset) return false;
_lastScrollOffset = currentOffset;
if (clamped == _lastScrollProgress) return false;
_lastScrollProgress = clamped;
widget.onScrollProgressChanged(clamped);
return false;
},
child: DiagonalWipeIconGridDemo(
scrollController: widget.scrollController,
onScrollProgressChanged: widget.onScrollProgressChanged,
animationMultiplier: widget.animationMultiplier,
allIconsWiped: widget.allIconsWiped,
isLooping: widget.isLooping,
accentColor: widget.selectedSeed.color,
onIconTap: widget.onIconTap,
gridHeader: widget.introVisible
? FadeTransition(
opacity: heroIntro,
child: SlideTransition(
position: heroSlide,
child: HeroSection(
onOpenHowItWorks: widget.onOpenHowItWorks,
onIconTap: widget.onHeroIconTap,
accentColor: widget.selectedSeed.color,
),
),
)
: const SizedBox.shrink(),
heroSelectedIcon: widget.heroSelectedIcon,
onHeroSelectedIconConsumed: widget.onHeroSelectedIconConsumed,
),
);
}
}
Path _buildAppTopBarXPath() {
final path = Path();
path.fillType = PathFillType.evenOdd;
path.moveTo(18.901, 1.153);
path.lineTo(22.581, 1.153);
path.lineTo(14.541, 10.343);
path.lineTo(24, 22.847);
path.lineTo(16.594, 22.847);
path.lineTo(10.794, 15.263);
path.lineTo(4.154, 22.847);
path.lineTo(0.47, 22.847);
path.lineTo(9.07, 13.017);
path.lineTo(0, 1.154);
path.lineTo(7.594, 1.154);
path.lineTo(12.837, 8.086);
path.lineTo(18.9, 1.153);
path.close();
path.moveTo(17.611, 20.647);
path.lineTo(19.65, 20.647);
path.lineTo(6.486, 3.24);
path.lineTo(4.298, 3.24);
path.lineTo(17.611, 20.647);
path.close();
return path;
}
Path _buildAppTopBarGitHubPath() {
final path = Path();
path.moveTo(12, 0);
path.cubicTo(5.374, 0, 0, 5.373, 0, 12);
path.cubicTo(0, 17.302, 3.438, 21.8, 8.207, 23.387);
path.cubicTo(8.806, 23.498, 9, 23.126, 9, 22.81);
path.lineTo(9, 20.576);
path.cubicTo(5.662, 21.302, 4.967, 19.16, 4.967, 19.16);
path.cubicTo(4.421, 17.773, 3.634, 17.404, 3.634, 17.404);
path.cubicTo(2.545, 16.659, 3.717, 16.675, 3.717, 16.675);
path.cubicTo(4.922, 16.759, 5.556, 17.912, 5.556, 17.912);
path.cubicTo(6.626, 19.746, 8.363, 19.216, 9.048, 18.909);
path.cubicTo(9.155, 18.134, 9.466, 17.604, 9.81, 17.305);
path.cubicTo(7.145, 17, 4.343, 15.971, 4.343, 11.374);
path.cubicTo(4.343, 10.063, 4.812, 8.993, 5.579, 8.153);
path.cubicTo(5.455, 7.85, 5.044, 6.629, 5.696, 4.977);
path.cubicTo(5.696, 4.977, 6.704, 4.655, 8.997, 6.207);
path.cubicTo(9.954, 5.941, 10.98, 5.808, 12, 5.803);
path.cubicTo(13.02, 5.808, 14.047, 5.941, 15.006, 6.207);
path.cubicTo(17.297, 4.655, 18.303, 4.977, 18.303, 4.977);
path.cubicTo(18.956, 6.63, 18.545, 7.851, 18.421, 8.153);
path.cubicTo(19.191, 8.993, 19.656, 10.063, 19.656, 11.374);
path.cubicTo(19.656, 15.983, 16.849, 16.998, 14.177, 17.295);
path.cubicTo(14.607, 17.667, 15, 18.397, 15, 19.517);
path.lineTo(15, 22.81);
path.cubicTo(15, 23.129, 15.192, 23.504, 15.801, 23.387);
path.cubicTo(20.566, 21.797, 24, 17.3, 24, 12);
path.cubicTo(24, 5.373, 18.627, 0, 12, 0);
path.close();
return path;
}
final Path _appTopBarXPath = _buildAppTopBarXPath();
final Path _appTopBarGitHubPath = _buildAppTopBarGitHubPath();
class _TopBarVectorIcon extends StatelessWidget {
const _TopBarVectorIcon({
required this.path,
required this.color,
this.size = 22,
});
final Path path;
final Color color;
final double size;
@override
Widget build(BuildContext context) {
return SizedBox(
width: size,
height: size,
child: CustomPaint(
painter: _TopBarVectorIconPainter(
path: path,
color: color,
),
),
);
}
}
class _TopBarVectorIconPainter extends CustomPainter {
const _TopBarVectorIconPainter({
required this.path,
required this.color,
});
final Path path;
final Color color;
@override
void paint(Canvas canvas, Size size) {
final Rect bounds = path.getBounds();
if (bounds.isEmpty || bounds.width == 0 || bounds.height == 0) return;
final double scale = math.min(
size.width / bounds.width,
size.height / bounds.height,
);
final double xOffset =
(size.width - bounds.width * scale) / 2 - bounds.left * scale;
final double yOffset =
(size.height - bounds.height * scale) / 2 - bounds.top * scale;
canvas.save();
canvas.translate(xOffset, yOffset);
canvas.scale(scale, scale);
canvas.drawPath(
path,
Paint()
..color = color
..style = PaintingStyle.fill,
);
canvas.restore();
}
@override
bool shouldRepaint(_TopBarVectorIconPainter oldDelegate) {
return oldDelegate.color != color || oldDelegate.path != path;
}
}
class AnimatedTopBar extends StatelessWidget implements PreferredSizeWidget {
const AnimatedTopBar({
required this.scrollTitleAlpha,
required this.isDark,
required this.onToggleDark,
required this.onOpenX,
required this.onOpenGitHub,
super.key,
});
final double scrollTitleAlpha;
final bool isDark;
final VoidCallback onToggleDark;
final VoidCallback onOpenX;
final VoidCallback onOpenGitHub;
@override
Widget build(BuildContext context) {
final colors = Theme.of(context).colorScheme;
final iconColor = colors.appOnBackground;
return AppBar(
centerTitle: false,
title: Opacity(
opacity: scrollTitleAlpha,
child: Text(
'Diagonal Wipe Icons for Flutter',
style: Theme.of(context).textTheme.titleMedium?.copyWith(
fontWeight: FontWeight.w600,
),
),
),
backgroundColor: colors.surface.withValues(alpha: 0.95),
surfaceTintColor: Colors.transparent,
elevation: 0,
actions: [
Padding(
padding: const EdgeInsets.only(right: 8),
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
IconButton(
tooltip: 'Open X',
onPressed: onOpenX,
constraints: const BoxConstraints(
minHeight: 40,
minWidth: 40,
),
padding: EdgeInsets.zero,
iconSize: 22,
splashRadius: 18,
style: IconButton.styleFrom(
visualDensity: VisualDensity.compact,
splashFactory: NoSplash.splashFactory,
hoverColor: Colors.transparent,
highlightColor: Colors.transparent,
focusColor: Colors.transparent,
),
icon: _TopBarVectorIcon(
path: _appTopBarXPath,
color: iconColor,
size: 22,
),
),
const SizedBox(width: 8),
IconButton(
tooltip: 'Open GitHub',
onPressed: onOpenGitHub,
constraints: const BoxConstraints(
minHeight: 40,
minWidth: 40,
),
padding: EdgeInsets.zero,
iconSize: 22,
splashRadius: 18,
style: IconButton.styleFrom(
visualDensity: VisualDensity.compact,
splashFactory: NoSplash.splashFactory,
hoverColor: Colors.transparent,
highlightColor: Colors.transparent,
focusColor: Colors.transparent,
),
icon: _TopBarVectorIcon(
path: _appTopBarGitHubPath,
color: iconColor,
size: 22,
),
),
const SizedBox(width: 8),
IconButton(
tooltip:
isDark ? 'Switch to light mode' : 'Switch to dark mode',
onPressed: onToggleDark,
constraints: const BoxConstraints(
minHeight: 40,
minWidth: 40,
),
padding: EdgeInsets.zero,
iconSize: 22,
splashRadius: 18,
style: IconButton.styleFrom(
visualDensity: VisualDensity.compact,
splashFactory: NoSplash.splashFactory,
hoverColor: Colors.transparent,
highlightColor: Colors.transparent,
focusColor: Colors.transparent,
),
icon: Icon(
isDark ? Symbols.light_mode : Symbols.dark_mode,
size: 22,
color: iconColor,
),
),
],
),
),
],
);
}
@override
Size get preferredSize => const Size.fromHeight(kToolbarHeight);
}
class HeroSection extends StatefulWidget {
const HeroSection({
required this.onOpenHowItWorks,
required this.onIconTap,
required this.accentColor,
super.key,
});
final VoidCallback? onOpenHowItWorks;
final ValueChanged<MaterialWipeIconPair> onIconTap;
final Color accentColor;
@override
State<HeroSection> createState() => _HeroSectionState();
}
class _HowItWorksButton extends StatelessWidget {
const _HowItWorksButton({
super.key,
required this.onTap,
required this.label,
});
final VoidCallback? onTap;
final String label;
@override
Widget build(BuildContext context) {
return FilledButton.tonal(
onPressed: onTap,
style: FilledButton.styleFrom(
backgroundColor: Theme.of(context).colorScheme.secondaryContainer,
foregroundColor: Theme.of(context).colorScheme.onSecondaryContainer,
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
shape: const RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(14)),
),
),
child: Text(
label,
style: Theme.of(context).textTheme.labelLarge?.copyWith(
fontWeight: FontWeight.w600,
),
),
);
}
}
class _HeroSectionState extends State<HeroSection>
with SingleTickerProviderStateMixin {
static final _heroPairs = [
MaterialWipeIconPair.symbols(
label: 'Visibility',
enabledIcon: MaterialSymbolName.visibility,
disabledIcon: MaterialSymbolName.visibilityOff,
),
MaterialWipeIconPair.symbols(
label: 'Wifi',
enabledIcon: MaterialSymbolName.wifi,
disabledIcon: MaterialSymbolName.wifiOff,
),
MaterialWipeIconPair.symbols(
label: 'Cloud',
enabledIcon: MaterialSymbolName.cloud,
disabledIcon: MaterialSymbolName.cloudOff,
),
MaterialWipeIconPair.symbols(
label: 'Warning',
enabledIcon: MaterialSymbolName.warning,
disabledIcon: MaterialSymbolName.warningOff,
),
MaterialWipeIconPair.symbols(
label: 'Alarm',
enabledIcon: MaterialSymbolName.alarm,
disabledIcon: MaterialSymbolName.alarmOff,
),
];
late final AnimationController _controller = AnimationController(
vsync: this,
duration: const Duration(milliseconds: 2400),
)..repeat();
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return SizedBox(
height: 480,
width: double.infinity,
child: Stack(
children: [
Positioned.fill(
child: CustomPaint(
painter: _HeroMeshBackgroundPainter(
backgroundColor: Theme.of(context).colorScheme.surface,
seedColor: widget.accentColor,
),
),
),
Positioned.fill(
child: _AnimatedHeroOrbs(accentColor: widget.accentColor),
),
Padding(
padding: const EdgeInsets.symmetric(
horizontal: 32,
),
child: Align(
alignment: Alignment.center,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Column(
children: [
Text(
'Diagonal Wipe Icons',
style: Theme.of(context)
.textTheme
.displaySmall
?.copyWith(
fontWeight: FontWeight.w800,
letterSpacing: -1,
color: Theme.of(context).colorScheme.onSurface,
),
textAlign: TextAlign.center,
),
const SizedBox(height: 8),
Text(
'Elegant morphing transitions for icons in Flutter',
style:
Theme.of(context).textTheme.titleMedium?.copyWith(
fontWeight: FontWeight.w500,
color: Theme.of(context)
.colorScheme
.onSurfaceVariant,
),
textAlign: TextAlign.center,
),
],
),
const SizedBox(height: 28),
SizedBox(
height: 110,
child: AnimatedBuilder(
animation: _controller,
builder: (context, _) => HeroIconShowcase(
pairs: _heroPairs,
cycleProgress: _controller.value,
onIconTap: widget.onIconTap,
),
),
),
const SizedBox(height: 28),
_HowItWorksButton(
key: const ValueKey('how-it-works-button'),
onTap: widget.onOpenHowItWorks,
label: 'How it works',
),
],
),
),
),
],
),
);
}
}
class _AnimatedHeroOrbs extends StatefulWidget {
const _AnimatedHeroOrbs({required this.accentColor});
final Color accentColor;
@override
State<_AnimatedHeroOrbs> createState() => _AnimatedHeroOrbsState();
}
class _AnimatedHeroOrbsState extends State<_AnimatedHeroOrbs>
with SingleTickerProviderStateMixin {
late final AnimationController _controller = AnimationController(
vsync: this,
duration: const Duration(milliseconds: 25000),
)..repeat();
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: _controller,
builder: (_, __) {
return CustomPaint(
painter: _HeroOrbsPainter(
accentColor: widget.accentColor,
orbitPhase: _controller.value * math.pi * 2,
),
child: const SizedBox.expand(),
);
},
);
}
}
class _HeroOrbsPainter extends CustomPainter {
const _HeroOrbsPainter({
required this.accentColor,
required this.orbitPhase,
});
final Color accentColor;
final double orbitPhase;
@override
void paint(Canvas canvas, Size size) {
final paint = Paint()
..shader = RadialGradient(
colors: [
accentColor.withValues(alpha: 0.06),
Colors.transparent,
],
).createShader(
Rect.fromCircle(
center: Offset(
size.width / 2 + math.cos(orbitPhase) * 120,
size.height / 2 + math.sin(orbitPhase) * 80,
),
radius: 250,
),
);
canvas.drawCircle(
Offset(
size.width / 2 + math.cos(orbitPhase) * 120,
size.height / 2 + math.sin(orbitPhase) * 80,
),
250,
paint,
);
}
@override
bool shouldRepaint(covariant _HeroOrbsPainter oldDelegate) =>
oldDelegate.accentColor != accentColor ||
oldDelegate.orbitPhase != orbitPhase;
}
class _HeroMeshBackgroundPainter extends CustomPainter {
const _HeroMeshBackgroundPainter({
required this.backgroundColor,
required this.seedColor,
});
final Color backgroundColor;
final Color seedColor;
@override
void paint(Canvas canvas, Size size) {
canvas.drawRect(Offset.zero & size, Paint()..color = backgroundColor);
canvas.drawRect(
Offset.zero & size,
Paint()
..shader = RadialGradient(
colors: [
seedColor.withValues(alpha: 0.025),
Colors.transparent,
],
center: Alignment.center,
radius: 0.7,
).createShader(Offset.zero & size),
);
}
@override
bool shouldRepaint(covariant _HeroMeshBackgroundPainter oldDelegate) =>
oldDelegate.backgroundColor != backgroundColor ||
oldDelegate.seedColor != seedColor;
}
class HeroIconShowcase extends StatelessWidget {
const HeroIconShowcase({
required this.pairs,
required this.cycleProgress,
required this.onIconTap,
super.key,
});
final List<MaterialWipeIconPair> pairs;
final double cycleProgress;
final ValueChanged<MaterialWipeIconPair> onIconTap;
@override
Widget build(BuildContext context) {
const double phaseStepMs = 200.0;
const double wipeToggleMs = 1200.0;
const double cycleMs = 2400.0;
return LayoutBuilder(
builder: (context, constraints) {
final maxVisibleIcons = ((constraints.maxWidth + heroIconSpacing) /
(heroIconSize + heroIconSpacing))
.toInt()
.clamp(1, pairs.length);
final startIndex = ((pairs.length - maxVisibleIcons) / 2)
.floor()
.clamp(0, pairs.length - maxVisibleIcons);
final visiblePairs =
pairs.sublist(startIndex, startIndex + maxVisibleIcons);
final clock = cycleProgress * cycleMs;
return Row(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: [
for (var visibleIndex = 0;
visibleIndex < visiblePairs.length;
visibleIndex++)
Padding(
padding:
const EdgeInsets.symmetric(horizontal: heroIconSpacing / 2),
child: HeroIconButton(
iconPair: visiblePairs[visibleIndex],
isWiped: () {
final index = startIndex + visibleIndex;
final localClock =
(cycleMs + clock - index * phaseStepMs) % cycleMs;
return localClock < wipeToggleMs;
}(),
onTap: () => onIconTap(visiblePairs[visibleIndex]),
size: heroIconSize,
),
),
],
);
},
);
}
}
class HeroIconButton extends StatefulWidget {
const HeroIconButton({
required this.iconPair,
required this.isWiped,
required this.onTap,
required this.size,
super.key,
});
final MaterialWipeIconPair iconPair;
final bool isWiped;
final VoidCallback onTap;
final double size;
@override
State<HeroIconButton> createState() => _HeroIconButtonState();
}
class _HeroIconButtonState extends State<HeroIconButton>
with TickerProviderStateMixin {
bool _hovered = false;
bool _pressed = false;
late final AnimationController _scaleController = AnimationController(
vsync: this,
lowerBound: 0.9,
upperBound: 1.1,
value: 1,
);
@override
void initState() {
super.initState();
_animateScale();
}
@override
void didUpdateWidget(covariant HeroIconButton oldWidget) {
super.didUpdateWidget(oldWidget);
if (oldWidget.isWiped != widget.isWiped) {
_animateScale();
}
}
@override
void dispose() {
_scaleController.dispose();
super.dispose();
}
double get _targetScale {
if (_pressed) return 0.95;
if (_hovered) return 1.08;
return widget.isWiped ? 1.03 : 1.0;
}
void _setPressed(bool value) {
if (_pressed == value) return;
setState(() => _pressed = value);
_animateScale();
}
void _setHovered(bool value) {
if (_hovered == value) return;
setState(() => _hovered = value);
_animateScale();
}
void _animateScale() {
final target = _targetScale;
_animateScaleWithSpring(
_scaleController,
target,
stiffness: 200,
dampingRatio: 0.5,
);
}
@override
Widget build(BuildContext context) {
final colors = Theme.of(context).colorScheme;
return MouseRegion(
cursor: SystemMouseCursors.click,
onEnter: (_) => _setHovered(true),
onExit: (_) => _setHovered(false),
child: GestureDetector(
onTapDown: (_) => _setPressed(true),
onTapUp: (_) => _setPressed(false),
onTapCancel: () => _setPressed(false),
onTap: widget.onTap,
child: AnimatedBuilder(
animation: _scaleController,
builder: (context, child) {
return Transform.scale(
alignment: Alignment.center,
scale: _scaleController.value,
child: child,
);
},
child: AnimatedContainer(
duration: const Duration(milliseconds: 200),
curve: Curves.easeOut,
width: widget.size,
height: widget.size,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(22),
color: colors.appSurfaceVariant.withValues(alpha: 0.5),
border: _hovered
? Border.all(
color: colors.outline.withValues(alpha: 0.5),
width: 1.5,
)
: null,
),
alignment: Alignment.center,
child: AnimatedDiagonalWipeIcon(
isWiped: widget.isWiped,
baseIcon: fallbackIconData(widget.iconPair.enabledIcon),
wipedIcon: fallbackIconData(widget.iconPair.disabledIcon),
baseTint: colors.primary,
wipedTint: colors.secondary,
size: widget.size * 0.49,
animationStyle: const AnimationStyle(
duration: Duration(milliseconds: 530),
reverseDuration: Duration(milliseconds: 800),
curve: Cubic(0.22, 1, 0.36, 1),
reverseCurve: Cubic(0.4, 0, 0.2, 1),
),
),
),
),
),
);
}
}
class DiagonalWipeIconGridDemo extends StatefulWidget {
const DiagonalWipeIconGridDemo({
required this.onIconTap,
required this.onScrollProgressChanged,
required this.animationMultiplier,
required this.allIconsWiped,
required this.isLooping,
required this.accentColor,
required this.gridHeader,
this.heroSelectedIcon,
required this.onHeroSelectedIconConsumed,
required this.scrollController,
super.key,
});
final IconTapCallback onIconTap;
final ValueChanged<double> onScrollProgressChanged;
final double animationMultiplier;
final bool allIconsWiped;
final bool isLooping;
final Color accentColor;
final Widget gridHeader;
final MaterialWipeIconPair? heroSelectedIcon;
final VoidCallback onHeroSelectedIconConsumed;
final ScrollController scrollController;
@override
State<DiagonalWipeIconGridDemo> createState() =>
_DiagonalWipeIconGridDemoState();
}
class _DiagonalWipeIconGridDemoState extends State<DiagonalWipeIconGridDemo> {
final Map<int, List<List<List<MaterialWipeIconPair>>>> _rowsByColumns = {};
final Map<int, int> _itemCountByColumns = {};
List<List<List<MaterialWipeIconPair>>> _sectionRowsForColumns(int columns) {
return _rowsByColumns.putIfAbsent(columns, () {
final rowsBySection = <List<List<MaterialWipeIconPair>>>[];
for (final section in iconSections) {
final rows = <List<MaterialWipeIconPair>>[];
for (var i = 0; i < section.icons.length; i += columns) {
final end = (i + columns).clamp(0, section.icons.length);
rows.add(section.icons.sublist(i, end));
}
rowsBySection.add(rows);
}
return rowsBySection;
});
}
int _itemCountForColumns(int columns) {
return _itemCountByColumns.putIfAbsent(columns, () {
final sectionRows = _sectionRowsForColumns(columns);
var itemCount = 1; // grid header
for (final rows in sectionRows) {
itemCount += 1; // section header
itemCount += rows.length; // section rows
itemCount += 1; // section gap
}
return itemCount;
});
}
@override
void didUpdateWidget(covariant DiagonalWipeIconGridDemo oldWidget) {
super.didUpdateWidget(oldWidget);
if (widget.heroSelectedIcon == null ||
widget.heroSelectedIcon == oldWidget.heroSelectedIcon) {
return;
}
final selectedPair = widget.heroSelectedIcon;
if (selectedPair == null) return;
WidgetsBinding.instance.addPostFrameCallback((_) {
if (!mounted || !context.mounted) return;
widget.onIconTap(selectedPair);
widget.onHeroSelectedIconConsumed();
});
}
@override
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (context, constraints) {
final horizontalPadding = constraints.maxWidth > uiGridMaxContentWidth
? ((constraints.maxWidth - uiGridMaxContentWidth) / 2) +
uiPageHorizontalPadding
: uiPageHorizontalPadding;
final contentWidth = (constraints.maxWidth - (horizontalPadding * 2))
.clamp(uiGridItemSlotWidth, double.infinity);
final columns =
(contentWidth / uiGridItemSlotWidth).toInt().clamp(1, 20);
final sectionRows = _sectionRowsForColumns(columns);
final itemCount = _itemCountForColumns(columns);
return ListView.separated(
controller: widget.scrollController,
padding: const EdgeInsets.only(top: 0, bottom: 48),
itemCount: itemCount,
separatorBuilder: (_, __) => const SizedBox(height: 12),
itemBuilder: (context, index) {
var remaining = index;
if (remaining == 0) {
return Align(
alignment: Alignment.topCenter,
child: widget.gridHeader,
);
}
remaining -= 1;
for (var sectionIndex = 0;
sectionIndex < iconSections.length;
sectionIndex++) {
final section = iconSections[sectionIndex];
final rows = sectionRows[sectionIndex];
if (remaining == 0) {
return Padding(
padding: EdgeInsets.symmetric(horizontal: horizontalPadding),
child: MaterialWipeIconSectionHeader(
section: section,
topPadding: sectionIndex == 0 ? 24 : 16,
bottomPadding: 16,
),
);
}
remaining -= 1;
if (remaining < rows.length) {
final row = rows[remaining];
return Padding(
padding: EdgeInsets.symmetric(horizontal: horizontalPadding),
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.center,
children: row
.map(
(pair) => DiagonalWipeIconGridItem(
key: ValueKey(pair.label),
iconPair: pair,
animationMultiplier: widget.animationMultiplier,
allIconsWiped: widget.allIconsWiped,
isLooping: widget.isLooping,
accentColor: widget.accentColor,
onOpen: () => widget.onIconTap(pair),
),
)
.toList(),
),
);
}
remaining -= rows.length;
if (remaining == 0) {
return const SizedBox(height: 20);
}
remaining -= 1;
}
return const SizedBox.shrink();
},
);
},
);
}
}
class MaterialWipeIconSectionHeader extends StatelessWidget {
const MaterialWipeIconSectionHeader({
required this.section,
this.topPadding = 16,
this.bottomPadding = 16,
super.key,
});
final MaterialWipeIconSection section;
final double topPadding;
final double bottomPadding;
@override
Widget build(BuildContext context) {
return Column(
children: [
Padding(
padding: EdgeInsets.only(top: topPadding),
child: Text(
section.title,
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.headlineSmall?.copyWith(
fontWeight: FontWeight.w700,
letterSpacing: -0.5,
),
),
),
const SizedBox(height: 8),
Padding(
padding: EdgeInsets.only(bottom: bottomPadding),
child: Text(
section.subtitle,
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.bodyLarge?.copyWith(
fontWeight: FontWeight.w400,
color: Theme.of(context).colorScheme.onSurfaceVariant,
),
),
),
],
);
}
}
class DiagonalWipeIconGridItem extends StatefulWidget {
const DiagonalWipeIconGridItem({
required this.iconPair,
required this.animationMultiplier,
required this.allIconsWiped,
required this.isLooping,
required this.accentColor,
required this.onOpen,
super.key,
});
final MaterialWipeIconPair iconPair;
final double animationMultiplier;
final bool allIconsWiped;
final bool isLooping;
final Color accentColor;
final VoidCallback onOpen;
@override
State<DiagonalWipeIconGridItem> createState() =>
_DiagonalWipeIconGridItemState();
}
class _DiagonalWipeIconGridItemState extends State<DiagonalWipeIconGridItem>
with SingleTickerProviderStateMixin {
bool _hovered = false;
bool _pressed = false;
late final AnimationController _scaleController = AnimationController(
vsync: this,
lowerBound: 0.95,
upperBound: 1.0,
value: 1,
);
@override
void dispose() {
_scaleController.dispose();
super.dispose();
}
@override
void didUpdateWidget(covariant DiagonalWipeIconGridItem oldWidget) {
super.didUpdateWidget(oldWidget);
if (_targetScale != _scaleController.value) {
_animateScale();
}
}
double get _targetScale => _pressed ? 0.95 : 1.0;
void _setPressed(bool value) {
if (_pressed == value) return;
setState(() => _pressed = value);
_animateScale();
}
void _setHovered(bool value) {
if (_hovered == value) return;
setState(() => _hovered = value);
// Note: No scale animation on hover in Compose - only on press
}
void _animateScale() {
final double targetScale = _targetScale;
_animateScaleWithSpring(
_scaleController,
targetScale,
stiffness: 500,
dampingRatio: 0.5,
);
}
@override
Widget build(BuildContext context) {
final isWiped = widget.isLooping ? widget.allIconsWiped : _hovered;
final animationStyle = AnimationStyle(
duration: Duration(
milliseconds: (530 * widget.animationMultiplier).round(),
),
reverseDuration: Duration(
milliseconds: (800 * widget.animationMultiplier).round(),
),
curve: const Cubic(0.22, 1, 0.36, 1),
reverseCurve: const Cubic(0.4, 0, 0.2, 1),
);
final Color borderColor = _pressed
? widget.accentColor
: _hovered
? widget.accentColor.withValues(alpha: 0.5)
: Colors.transparent;
final Color textColor = _pressed
? widget.accentColor
: _hovered
? Theme.of(context).colorScheme.onSurface
: Theme.of(context).colorScheme.onSurfaceVariant;
final Color iconBgColor = _pressed
? widget.accentColor.withValues(alpha: 0.2)
: _hovered
? widget.accentColor.withValues(alpha: 0.12)
: Theme.of(context)
.colorScheme
.appSurfaceVariant
.withValues(alpha: 0.5);
return Semantics(
button: true,
label: widget.iconPair.label,
child: RepaintBoundary(
child: MouseRegion(
cursor: SystemMouseCursors.click,
onEnter: (_) => _setHovered(true),
onExit: (_) => _setHovered(false),
child: GestureDetector(
onTapDown: (_) => _setPressed(true),
onTapUp: (_) => _setPressed(false),
onTapCancel: () => _setPressed(false),
onTap: widget.onOpen,
child: AnimatedBuilder(
animation: _scaleController,
builder: (_, child) => Transform.scale(
alignment: Alignment.center,
scale: _scaleController.value,
filterQuality: FilterQuality.high,
child: child,
),
child: SizedBox(
width: uiGridItemSlotWidth,
child: Padding(
padding:
const EdgeInsets.symmetric(horizontal: 10, vertical: 20),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
AnimatedContainer(
duration: const Duration(milliseconds: 200),
curve: Curves.ease,
width: 80,
height: 80,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
color: iconBgColor,
),
child: Stack(
fit: StackFit.expand,
children: [
Center(
child: Padding(
padding: const EdgeInsets.all(18),
child: AnimatedDiagonalWipeIcon(
isWiped: isWiped,
baseIcon: fallbackIconData(
widget.iconPair.enabledIcon,
),
wipedIcon: fallbackIconData(
widget.iconPair.disabledIcon,
),
baseTint:
Theme.of(context).colorScheme.primary,
wipedTint:
Theme.of(context).colorScheme.secondary,
size: 44,
animationStyle: animationStyle,
),
),
),
Positioned.fill(
child: IgnorePointer(
child: AnimatedContainer(
duration: const Duration(milliseconds: 200),
curve: Curves.ease,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
border: Border.all(
color: borderColor,
width: (_hovered || _pressed) ? 1.5 : 0,
),
),
),
),
),
],
),
),
const SizedBox(height: 20),
Text(
widget.iconPair.label,
textAlign: TextAlign.center,
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: Theme.of(context).textTheme.bodyMedium?.copyWith(
color: textColor,
fontWeight:
_hovered ? FontWeight.w600 : FontWeight.w500,
),
),
],
),
),
),
),
),
),
),
);
}
}
class BottomToolbar extends StatelessWidget {
const BottomToolbar({
required this.themeSeedOptions,
required this.selectedSeedIndex,
required this.onSeedSelected,
required this.isSlowMode,
required this.onToggleSlowMode,
required this.isLooping,
required this.onToggleLoop,
super.key,
});
final List<ThemeSeed> themeSeedOptions;
final int selectedSeedIndex;
final ValueChanged<int> onSeedSelected;
final bool isSlowMode;
final VoidCallback onToggleSlowMode;
final bool isLooping;
final ValueChanged<bool> onToggleLoop;
@override
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (context, constraints) {
final bool showSeedDivider = constraints.maxWidth >= 560;
final toolbarTheme = Theme.of(context).colorScheme;
final toolbarMaxWidth = (constraints.maxWidth - 32).clamp(0.0, 1180.0);
return Center(
child: ConstrainedBox(
constraints: BoxConstraints(
maxWidth: toolbarMaxWidth,
),
child: Material(
color: toolbarTheme.surface,
elevation: 4,
borderRadius: BorderRadius.circular(20),
child: Container(
padding: const EdgeInsets.all(10),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
),
child: Row(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Flexible(
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
for (var index = 0;
index < themeSeedOptions.length;
index++)
Padding(
padding: const EdgeInsets.only(right: 0),
child: _ThemeColorSwatch(
seed: themeSeedOptions[index],
selected: selectedSeedIndex == index,
onTap: () => onSeedSelected(index),
),
),
if (showSeedDivider) ...[
const SizedBox(width: 8),
SizedBox(
width: 1,
height: 24,
child: DecoratedBox(
decoration: BoxDecoration(
color: toolbarTheme.outlineVariant
.withValues(alpha: 0.5),
),
),
),
const SizedBox(width: 8),
],
],
),
),
),
TextButton(
key: const ValueKey('toolbar-speed-toggle'),
onPressed: onToggleSlowMode,
style: TextButton.styleFrom(
foregroundColor: isSlowMode
? toolbarTheme.primary
: toolbarTheme.onSurfaceVariant,
padding: const EdgeInsets.symmetric(
horizontal: 10,
vertical: 8,
),
),
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
const Icon(Symbols.speed, size: 17),
const SizedBox(width: 6),
Text(
isSlowMode ? '0.5x' : '1x',
style: Theme.of(context)
.textTheme
.labelMedium
?.copyWith(
fontWeight: isSlowMode
? FontWeight.w600
: FontWeight.w500,
),
),
],
),
),
const SizedBox(width: 8),
FilledButton.tonal(
key: const ValueKey('toolbar-loop-toggle'),
onPressed: () => onToggleLoop(!isLooping),
style: FilledButton.styleFrom(
backgroundColor: isLooping
? toolbarTheme.primaryContainer
: toolbarTheme.secondaryContainer
.withValues(alpha: 0.78),
foregroundColor: isLooping
? toolbarTheme.onPrimaryContainer
: toolbarTheme.onSecondaryContainer,
padding: const EdgeInsets.symmetric(
horizontal: 12,
vertical: 8,
),
),
child: Row(
children: [
Icon(
isLooping ? Symbols.stop : Symbols.play_arrow,
size: 17,
),
const SizedBox(width: 6),
Text(
isLooping ? 'Stop' : 'Loop',
style: Theme.of(context)
.textTheme
.labelMedium
?.copyWith(
fontWeight: isLooping
? FontWeight.w600
: FontWeight.w500,
),
),
],
),
),
],
),
),
),
),
);
},
);
}
}
class _ThemeColorSwatch extends StatefulWidget {
const _ThemeColorSwatch({
required this.seed,
required this.selected,
required this.onTap,
});
final ThemeSeed seed;
final bool selected;
final VoidCallback onTap;
@override
State<_ThemeColorSwatch> createState() => _ThemeColorSwatchState();
}
class _ThemeColorSwatchState extends State<_ThemeColorSwatch>
with TickerProviderStateMixin {
bool _hovered = false;
bool _pressed = false;
late final AnimationController _scaleController = AnimationController(
vsync: this,
lowerBound: 0.93,
upperBound: 1.04,
value: 1,
);
late final AnimationController _selectionController = AnimationController(
vsync: this,
lowerBound: 0,
upperBound: 1,
value: widget.selected ? 1 : 0,
);
@override
void dispose() {
_scaleController.dispose();
_selectionController.dispose();
super.dispose();
}
@override
void didUpdateWidget(covariant _ThemeColorSwatch oldWidget) {
super.didUpdateWidget(oldWidget);
if (oldWidget.selected != widget.selected) {
_animateSelection();
}
}
double get _pressScaleTarget => _pressed ? 0.93 : (_hovered ? 1.04 : 1);
double get _selectionTarget => widget.selected ? 1 : 0;
void _setPressed(bool value) {
if (_pressed == value) return;
setState(() => _pressed = value);
_animatePressScale();
}
void _setHovered(bool value) {
if (_hovered == value) return;
setState(() => _hovered = value);
_animatePressScale();
}
void _animatePressScale() {
final double targetScale = _pressScaleTarget;
_animateScaleWithSpring(
_scaleController,
targetScale,
stiffness: 700,
dampingRatio: 0.6,
);
}
void _animateSelection() {
final double target = _selectionTarget;
_animateScaleWithSpring(
_selectionController,
target,
stiffness: 520,
dampingRatio: 0.7,
);
}
@override
Widget build(BuildContext context) {
final bool showSelected = widget.selected;
final Color swatchColor = widget.seed.color;
final bool highContrastText = (0.2126 * swatchColor.r +
0.7152 * swatchColor.g +
0.0722 * swatchColor.b) >
0.5;
final double selectionProgress = _selectionController.value.clamp(0.0, 1.0);
final double cornerRadius = 8 + (8 * selectionProgress);
const double glowDiameter = 54;
final double orbScale = 0.84 + (0.16 * selectionProgress);
const double orbSize = 32;
final double rotation = 8 * selectionProgress;
final double checkOpacity = selectionProgress;
final double glowOpacity = selectionProgress;
final Color checkColor =
highContrastText ? Colors.black.withValues(alpha: 0.75) : Colors.white;
return Semantics(
button: true,
selected: showSelected,
label: '${widget.seed.name} theme',
onTapHint: showSelected
? 'Current theme selection'
: 'Select ${widget.seed.name} theme',
child: MouseRegion(
cursor: SystemMouseCursors.click,
onEnter: (_) => _setHovered(true),
onExit: (_) => _setHovered(false),
child: GestureDetector(
onTapDown: (_) => _setPressed(true),
onTapUp: (_) => _setPressed(false),
onTapCancel: () => _setPressed(false),
onTap: widget.onTap,
child: AnimatedBuilder(
animation: _scaleController,
builder: (_, child) => Transform.scale(
alignment: Alignment.center,
scale: _scaleController.value,
child: child,
),
child: AnimatedBuilder(
animation: _selectionController,
builder: (_, child) => SizedBox(
width: 38,
height: 38,
child: Stack(
alignment: Alignment.center,
children: [
Opacity(
opacity: glowOpacity,
child: Container(
width: glowDiameter,
height: glowDiameter,
decoration: BoxDecoration(
color: widget.seed.color.withValues(alpha: 0.38),
shape: BoxShape.circle,
),
),
),
Transform.scale(
alignment: Alignment.center,
scaleX: orbScale,
scaleY: orbScale,
child: Transform.rotate(
angle: rotation * (math.pi / 180),
child: Container(
width: orbSize,
height: orbSize,
decoration: BoxDecoration(
color: widget.seed.color,
borderRadius: BorderRadius.circular(cornerRadius),
),
alignment: Alignment.center,
child: Stack(
children: [
Container(
decoration: BoxDecoration(
borderRadius:
BorderRadius.circular(cornerRadius),
gradient: const LinearGradient(
begin: Alignment.topLeft,
end: Alignment.bottomRight,
colors: [
Color(0x38FFFFFF),
Colors.transparent,
],
),
),
),
Center(
child: Transform.rotate(
angle: -rotation * (math.pi / 180),
child: Opacity(
opacity: checkOpacity,
child: Icon(
Symbols.check,
size: 16,
color: checkColor,
),
),
),
),
],
),
),
),
),
],
),
),
child: const SizedBox.shrink(),
),
),
),
),
);
}
}
class IconPreviewDialog extends StatefulWidget {
const IconPreviewDialog({
required this.iconPair,
required this.baseAnimationMultiplier,
super.key,
});
final MaterialWipeIconPair iconPair;
final double baseAnimationMultiplier;
@override
State<IconPreviewDialog> createState() => _IconPreviewDialogState();
}
class _IconPreviewDialogState extends State<IconPreviewDialog> {
bool _isWiped = false;
bool _isPlaying = true;
bool _previewSlowMode = false;
bool _previewHovered = false;
bool _pausedTapWiped = false;
bool _hasHoveredWhilePaused = false;
bool _isCopyFeedback = false;
bool _copyHovered = false;
int _loopToken = 0;
async.Timer? _loopDelayTimer;
async.Timer? _copyResetTimer;
@override
void initState() {
super.initState();
_previewSlowMode = widget.baseAnimationMultiplier > 1.0;
_startLoop();
}
@override
void didUpdateWidget(covariant IconPreviewDialog oldWidget) {
super.didUpdateWidget(oldWidget);
if (widget.baseAnimationMultiplier != oldWidget.baseAnimationMultiplier &&
_isPlaying) {
_startLoop();
}
}
@override
void dispose() {
_copyResetTimer?.cancel();
_loopDelayTimer?.cancel();
_loopToken++;
super.dispose();
}
void _startLoop() {
_loopToken++;
final int token = _loopToken;
_loopDelayTimer?.cancel();
_runLoop(token);
}
Future<void> _runLoop(int token) async {
while (mounted && _isPlaying && token == _loopToken) {
setState(() => _isWiped = true);
final delay = autoPlayDelay(
wipeInDurationMillis,
_isSlow ? slowAnimationMultiplier : 1.0,
);
if (!await _awaitDelay(token, delay)) {
return;
}
if (!mounted || token != _loopToken || !_isPlaying) break;
setState(() => _isWiped = false);
if (!await _awaitDelay(token, delay)) {
return;
}
if (!mounted || token != _loopToken || !_isPlaying) break;
}
}
Future<bool> _awaitDelay(int token, int delayMillis) {
if (_loopDelayTimer != null && _loopDelayTimer!.isActive) {
_loopDelayTimer!.cancel();
}
if (!mounted || token != _loopToken || !_isPlaying) {
return Future.value(false);
}
final completer = async.Completer<void>();
_loopDelayTimer = async.Timer(Duration(milliseconds: delayMillis), () {
if (!mounted || token != _loopToken || !_isPlaying) {
completer.complete();
return;
}
completer.complete();
});
return completer.future
.then((_) => mounted && token == _loopToken && _isPlaying);
}
bool get _isSlow => _previewSlowMode || widget.baseAnimationMultiplier > 1.0;
bool get _previewIsWiped => _isPlaying
? _isWiped
: _hasHoveredWhilePaused
? _previewHovered
: _pausedTapWiped;
void _setPreviewHovered(bool hovered) {
if (_previewHovered == hovered) return;
setState(() {
_previewHovered = hovered;
if (!_isPlaying && hovered) {
_hasHoveredWhilePaused = true;
}
});
}
void _onPreviewTap() {
if (_isPlaying) {
_loopToken++;
setState(() {
_isPlaying = false;
_isWiped = false;
_pausedTapWiped = false;
_hasHoveredWhilePaused = false;
});
} else {
setState(() {
_isWiped = false;
_hasHoveredWhilePaused = false;
_pausedTapWiped = !_pausedTapWiped;
});
}
}
void _togglePlaying() {
if (_isPlaying) {
_loopToken++;
setState(() {
_isPlaying = false;
_isWiped = false;
_pausedTapWiped = false;
_hasHoveredWhilePaused = false;
});
} else {
_loopToken++;
setState(() {
_isPlaying = true;
_pausedTapWiped = false;
_hasHoveredWhilePaused = false;
_isWiped = false;
});
_startLoop();
}
}
void _toggleSlowMode() {
setState(() {
_previewSlowMode = !_previewSlowMode;
});
if (_isPlaying) _startLoop();
}
Future<void> _copyCode(String snippet) async {
await Clipboard.setData(ClipboardData(text: snippet));
_copyResetTimer?.cancel();
setState(() => _isCopyFeedback = true);
_copyResetTimer = async.Timer(const Duration(milliseconds: 1400), () {
if (!mounted) return;
setState(() => _isCopyFeedback = false);
});
}
@override
Widget build(BuildContext context) {
final snippet = buildDiagonalWipeUsageSnippet(widget.iconPair);
final dialogMaxWidth = _composeDialogMaxWidth(context);
final contentMaxWidth = math.min(dialogMaxWidth, 620.0);
final dialogMaxHeight = MediaQuery.sizeOf(context).height * 0.94;
return Dialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(28),
),
backgroundColor: Theme.of(context).colorScheme.surface,
insetPadding: const EdgeInsets.all(16),
child: ConstrainedBox(
constraints: BoxConstraints(
maxWidth: dialogMaxWidth,
maxHeight: dialogMaxHeight,
),
child: SingleChildScrollView(
padding: const EdgeInsets.all(32),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Align(
alignment: Alignment.topCenter,
child: ConstrainedBox(
constraints: BoxConstraints(maxWidth: contentMaxWidth),
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
_previewControls(context),
const SizedBox(height: 16),
_codePane(context, snippet),
],
),
),
),
const SizedBox(height: 18),
Align(
alignment: Alignment.centerRight,
child: TextButton(
onPressed: () => Navigator.of(context).pop(),
child: const Text('Close'),
),
),
],
),
),
),
);
}
Widget _previewControls(BuildContext context) {
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Text(
widget.iconPair.label,
style: Theme.of(context).textTheme.headlineSmall?.copyWith(
fontWeight: FontWeight.w600,
),
),
const SizedBox(height: 24),
MouseRegion(
cursor: SystemMouseCursors.click,
onEnter: (_) => _setPreviewHovered(true),
onExit: (_) => _setPreviewHovered(false),
child: GestureDetector(
onTap: _onPreviewTap,
child: AnimatedContainer(
duration: const Duration(milliseconds: 160),
curve: Curves.easeOut,
width: 240,
height: 240,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(28),
color: Theme.of(context)
.colorScheme
.appSurfaceVariant
.withValues(alpha: 0.5),
),
alignment: Alignment.center,
child: AnimatedDiagonalWipeIcon(
isWiped: _previewIsWiped,
baseIcon: fallbackIconData(widget.iconPair.enabledIcon),
wipedIcon: fallbackIconData(widget.iconPair.disabledIcon),
baseTint: Theme.of(context).colorScheme.primary,
wipedTint: Theme.of(context).colorScheme.secondary,
size: 120,
animationStyle: AnimationStyle(
duration: Duration(
milliseconds: _previewSlowMode ? 1060 : 530,
),
reverseDuration: Duration(
milliseconds: _previewSlowMode ? 1600 : 800,
),
curve: const Cubic(0.22, 1, 0.36, 1),
reverseCurve: const Cubic(0.4, 0, 0.2, 1),
),
),
),
),
),
const SizedBox(height: 24),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
_PreviewDialogControl(
label: _isPlaying ? 'Playing' : 'Paused',
icon: _isPlaying ? Symbols.pause : Symbols.play_arrow,
selected: _isPlaying,
onPressed: _togglePlaying,
),
const SizedBox(width: 12),
_PreviewDialogControl(
label: _previewSlowMode ? '0.5x' : '1x',
icon: Symbols.speed,
selected: _previewSlowMode,
onPressed: _toggleSlowMode,
),
],
),
],
);
}
Widget _codePane(BuildContext context, String snippet) {
return Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
color: Theme.of(context)
.colorScheme
.surfaceContainerHighest
.withValues(alpha: 0.3),
),
padding: const EdgeInsets.all(20),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: [
Row(
children: [
Expanded(
child: Text(
'Code',
style: Theme.of(context).textTheme.titleMedium?.copyWith(
fontWeight: FontWeight.w600,
),
),
),
MouseRegion(
cursor: SystemMouseCursors.click,
onEnter: (_) {
if (_copyHovered) return;
setState(() => _copyHovered = true);
},
onExit: (_) {
if (!_copyHovered) return;
setState(() => _copyHovered = false);
},
child: GestureDetector(
onTap: () => _copyCode(snippet),
child: AnimatedContainer(
duration: const Duration(milliseconds: 200),
width: 36,
height: 36,
alignment: Alignment.center,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8),
color: (_isCopyFeedback || _copyHovered)
? Theme.of(context).colorScheme.surface
: Colors.transparent,
),
child: Icon(
_isCopyFeedback ? Symbols.check : Symbols.content_copy,
size: 20,
color: _isCopyFeedback
? Theme.of(context).colorScheme.primary
: Theme.of(context).colorScheme.onSurfaceVariant,
),
),
),
),
],
),
const SizedBox(height: 16),
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(16),
color: Theme.of(context).colorScheme.surface,
),
constraints: const BoxConstraints(minHeight: 180, maxHeight: 320),
child: SingleChildScrollView(
padding: const EdgeInsets.all(16),
child: SyntaxHighlightedCode(
code: snippet,
style: Theme.of(context)
.textTheme
.bodyMedium
?.copyWith(fontSize: 13),
),
),
),
],
),
);
}
}
class _PreviewDialogControl extends StatefulWidget {
const _PreviewDialogControl({
required this.label,
required this.icon,
required this.selected,
required this.onPressed,
});
final String label;
final IconData icon;
final bool selected;
final VoidCallback onPressed;
@override
State<_PreviewDialogControl> createState() => _PreviewDialogControlState();
}
class _PreviewDialogControlState extends State<_PreviewDialogControl>
with SingleTickerProviderStateMixin {
bool _hovered = false;
bool _pressed = false;
late final AnimationController _scaleController = AnimationController(
vsync: this,
lowerBound: 0.95,
upperBound: 1.0,
value: 1,
);
@override
void dispose() {
_scaleController.dispose();
super.dispose();
}
double get _scaleTarget => _pressed ? 0.95 : 1.0;
void _setPressed(bool value) {
if (_pressed == value) return;
setState(() => _pressed = value);
_animateScale();
}
void _setHovered(bool value) {
if (_hovered == value) return;
setState(() => _hovered = value);
}
void _animateScale() {
final double targetScale = _scaleTarget;
_animateScaleWithSpring(
_scaleController,
targetScale,
stiffness: 500,
dampingRatio: 1,
);
}
@override
Widget build(BuildContext context) {
final colors = Theme.of(context).colorScheme;
final Color background = widget.selected
? colors.primaryContainer
: (_hovered ? colors.appSurfaceVariant : colors.surface);
final Color textColor =
widget.selected ? colors.onPrimaryContainer : colors.onSurfaceVariant;
return Semantics(
button: true,
selected: widget.selected,
label: widget.label,
child: GestureDetector(
onTapDown: (_) => _setPressed(true),
onTapUp: (_) => _setPressed(false),
onTapCancel: () => _setPressed(false),
onTap: widget.onPressed,
child: MouseRegion(
cursor: SystemMouseCursors.click,
onEnter: (_) => _setHovered(true),
onExit: (_) => _setHovered(false),
child: AnimatedBuilder(
animation: _scaleController,
builder: (_, child) => Transform.scale(
alignment: Alignment.center,
scale: _scaleController.value,
child: child,
),
child: AnimatedContainer(
duration: const Duration(milliseconds: 200),
curve: Curves.easeOut,
height: 44,
padding: const EdgeInsets.symmetric(horizontal: 16),
decoration: BoxDecoration(
color: background,
borderRadius: BorderRadius.circular(12),
),
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
Icon(widget.icon, size: 20, color: textColor),
const SizedBox(width: 8),
Text(
widget.label,
style: Theme.of(context).textTheme.labelLarge?.copyWith(
color: textColor,
fontWeight: FontWeight.w500,
),
),
],
),
),
),
),
),
);
}
}
class HowItWorksDialog extends StatefulWidget {
const HowItWorksDialog({
required this.onDirectionChanged,
required this.initialDirection,
required this.pair,
super.key,
});
final ValueChanged<WipeDirection> onDirectionChanged;
final WipeDirection initialDirection;
final MaterialWipeIconPair pair;
@override
State<HowItWorksDialog> createState() => _HowItWorksDialogState();
}
class _HowItWorksDialogState extends State<HowItWorksDialog>
with TickerProviderStateMixin {
static const _flowFrameHeight = 100.0;
static const _flowSquareSize = 64.0;
static const _howItWorksAnimationMultiplier = slowAnimationMultiplier;
static const _howItWorksWipeInCurve = Cubic(0.33, 0.0, 0.67, 1.0);
static const _howItWorksWipeOutCurve = Cubic(0.33, 0.0, 0.67, 1.0);
late WipeDirection _direction = widget.initialDirection;
int _loopToken = 0;
late final AnimationController _progressController = AnimationController(
vsync: this,
value: 0,
lowerBound: 0,
upperBound: 1,
);
@override
void initState() {
super.initState();
_startLoop();
}
@override
void dispose() {
_loopToken++;
_progressController.stop();
_progressController.dispose();
super.dispose();
}
int _durationForIn() {
return scaledDuration(wipeInDurationMillis, _howItWorksAnimationMultiplier);
}
int _durationForOut() {
return scaledDuration(
wipeOutDurationMillis, _howItWorksAnimationMultiplier);
}
void _startLoop() {
_loopToken++;
_progressController.stop();
final int token = _loopToken;
_runLoop(token);
}
Future<void> _animateToTarget(
double targetValue,
int durationMillis,
Curve curve,
) {
return _progressController.animateTo(
targetValue.clamp(0.0, 1.0),
duration: Duration(milliseconds: durationMillis),
curve: curve,
);
}
Future<void> _runLoop(int token) async {
while (mounted && token == _loopToken) {
await _animateToTarget(
1,
_durationForIn(),
_howItWorksWipeInCurve,
);
if (!mounted || token != _loopToken) return;
await _animateToTarget(
0,
_durationForOut(),
_howItWorksWipeOutCurve,
);
if (!mounted || token != _loopToken) return;
}
}
@override
Widget build(BuildContext context) {
final allowedColor = Theme.of(context).colorScheme.primary;
final blockedColor = Theme.of(context).colorScheme.secondary;
final dialogMaxWidth = _composeDialogMaxWidth(context);
return Dialog(
insetPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(28),
),
backgroundColor: Theme.of(context).colorScheme.surface,
child: ConstrainedBox(
constraints: BoxConstraints(
maxWidth: dialogMaxWidth,
maxHeight: MediaQuery.sizeOf(context).height * 0.94,
),
child: SingleChildScrollView(
padding: const EdgeInsets.all(32),
child: AnimatedBuilder(
animation: _progressController,
builder: (context, _) {
final progress = _progressController.value.clamp(0.0, 1.0);
return Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'How it works',
style: Theme.of(context).textTheme.headlineSmall?.copyWith(
fontWeight: FontWeight.w600,
),
),
const SizedBox(height: 20),
Text(
'SF Symbols has built-in symbol transitions. '
'Material Icons does not, so this gives you the same '
'kind of morph without hand-drawing a custom vector.',
style: Theme.of(context).textTheme.bodyMedium?.copyWith(
color: Theme.of(context).colorScheme.onSurfaceVariant,
),
),
const SizedBox(height: 20),
_howItWorksDirectionSelector(
direction: _direction,
onDirectionChange: (value) {
setState(() => _direction = value);
widget.onDirectionChanged(value);
},
),
const SizedBox(height: 20),
_howItWorksFlow(
allowedColor,
blockedColor,
progress,
),
const SizedBox(height: 20),
Text(
'Use two icons and one animated mask. It is much '
'easier and faster than building and maintaining '
'custom vector paths by hand.',
style: Theme.of(context).textTheme.bodyMedium?.copyWith(
color: Theme.of(context).colorScheme.onSurfaceVariant,
),
),
const SizedBox(height: 20),
Align(
alignment: Alignment.centerRight,
child: TextButton(
onPressed: () => Navigator.of(context).pop(),
child: const Text('Close'),
),
),
],
);
},
),
),
),
);
}
Widget _howItWorksFlow(
Color allowedColor,
Color blockedColor,
double progress,
) {
return Row(
children: [
Expanded(
flex: 3,
child: Container(
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Theme.of(context)
.colorScheme
.appSurfaceVariant
.withValues(alpha: 0.3),
borderRadius: BorderRadius.circular(16),
),
child: Row(
children: [
Expanded(
child: _HowItWorksStep(
title: 'Base',
frameHeight: _flowFrameHeight,
child: _howItWorksSingleLayer(
baseIconName: widget.pair.enabledIcon,
wipedIconName: widget.pair.enabledIcon,
baseTint: allowedColor,
wipedTint: Colors.transparent,
direction: _direction,
progress: progress,
),
),
),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 6),
child: Text(
'+',
style: Theme.of(context).textTheme.titleLarge?.copyWith(
color: Theme.of(context).colorScheme.onSurfaceVariant,
),
),
),
Expanded(
child: _HowItWorksStep(
title: 'Overlay',
frameHeight: _flowFrameHeight,
child: _howItWorksSingleLayer(
baseIconName: widget.pair.disabledIcon,
wipedIconName: widget.pair.disabledIcon,
baseTint: Colors.transparent,
wipedTint: blockedColor,
direction: _direction,
progress: progress,
),
),
),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 6),
child: Text(
'+',
style: Theme.of(context).textTheme.titleLarge?.copyWith(
color: Theme.of(context).colorScheme.onSurfaceVariant,
),
),
),
Expanded(
child: _HowItWorksStep(
title: 'Mask',
frameHeight: _flowFrameHeight,
child: _howItWorksMaskLayer(
baseIconName: widget.pair.enabledIcon,
overlayIconName: widget.pair.disabledIcon,
baseColor: allowedColor,
overlayColor: blockedColor,
direction: _direction,
progress: progress,
),
),
),
],
),
),
),
const SizedBox(width: 8),
Text(
'=',
style: Theme.of(context).textTheme.headlineMedium?.copyWith(
color: Theme.of(context).colorScheme.onSurfaceVariant,
fontWeight: FontWeight.w600,
),
),
const SizedBox(width: 8),
Expanded(
child: Container(
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Theme.of(context)
.colorScheme
.appSurfaceVariant
.withValues(alpha: 0.3),
borderRadius: BorderRadius.circular(16),
),
alignment: Alignment.center,
child: _HowItWorksStep(
title: 'Result',
frameHeight: _flowFrameHeight,
child: _howItWorksSingleLayer(
baseIconName: widget.pair.enabledIcon,
wipedIconName: widget.pair.disabledIcon,
baseTint: allowedColor,
wipedTint: blockedColor,
direction: _direction,
progress: progress,
padding: EdgeInsets.zero,
),
),
),
),
],
);
}
Widget _howItWorksSingleLayer({
required MaterialSymbolName baseIconName,
required MaterialSymbolName wipedIconName,
required Color baseTint,
required Color wipedTint,
required WipeDirection direction,
required double progress,
EdgeInsetsGeometry padding = const EdgeInsets.all(2),
}) {
return Padding(
padding: padding,
child: DiagonalWipeTransition(
progress: AlwaysStoppedAnimation(progress),
baseChild: Icon(fallbackIconData(baseIconName)),
wipedChild: Icon(fallbackIconData(wipedIconName)),
size: _flowSquareSize,
direction: direction,
),
);
}
Widget _howItWorksMaskLayer({
required MaterialSymbolName baseIconName,
required MaterialSymbolName overlayIconName,
required Color baseColor,
required Color overlayColor,
required WipeDirection direction,
required double progress,
}) {
final clampedProgress = progress.clamp(0.0, 1.0);
final rotation = clampedProgress * 180;
return SizedBox(
width: _flowSquareSize,
height: _flowSquareSize,
child: Stack(
alignment: Alignment.center,
children: [
if (rotation < 90) ...[
_howItWorksRotatingIcon(
iconName: baseIconName,
color: baseColor,
direction: direction,
progress: clampedProgress,
isBase: true,
),
] else ...[
_howItWorksRotatingIcon(
iconName: overlayIconName,
color: overlayColor,
direction: direction,
progress: clampedProgress,
isBase: false,
),
],
if (clampedProgress >= 0.2 && clampedProgress <= 0.8)
Positioned.fill(
child: IgnorePointer(
child: CustomPaint(
painter: _HowItWorksBoundaryPainterWrapper(
progress: clampedProgress,
direction: direction,
color: Theme.of(context)
.colorScheme
.tertiary
.withValues(alpha: 0.8),
),
),
),
),
],
),
);
}
Widget _howItWorksRotatingIcon({
required MaterialSymbolName iconName,
required Color color,
required WipeDirection direction,
required double progress,
required bool isBase,
}) {
final rotation = progress * 180;
final bool isFirstHalf =
isBase && rotation < 90 || (!isBase && rotation > 90);
final double normalizedRotation = isBase ? rotation : rotation - 180;
final double alpha = isBase ? 1 - (rotation / 90) : (rotation - 90) / 90;
if (!isFirstHalf) return const SizedBox.shrink();
return Transform(
alignment: Alignment.center,
transform: Matrix4.identity()
..rotateY(normalizedRotation * (math.pi / 180)),
child: Opacity(
opacity: alpha.clamp(0.0, 1.0),
child: materialSymbolIcon(
symbolName: iconName,
size: _flowSquareSize,
color: color,
),
),
);
}
Widget _howItWorksDirectionSelector({
required WipeDirection direction,
required ValueChanged<WipeDirection> onDirectionChange,
}) {
final colors = Theme.of(context).colorScheme;
return Container(
width: double.infinity,
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: colors.appSurfaceVariant.withValues(alpha: 0.3),
borderRadius: BorderRadius.circular(20),
),
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: [
_HowItWorksDirectionGrid(
direction: direction,
onDirectionChange: onDirectionChange,
),
const SizedBox(height: 16),
Text(
_howItWorksDirectionLabels[direction] ?? 'Top-left to bottom-right',
style: Theme.of(context).textTheme.labelMedium?.copyWith(
color: colors.onSurfaceVariant,
fontWeight: FontWeight.w500,
),
),
],
),
);
}
}
class _HowItWorksDirectionGrid extends StatelessWidget {
const _HowItWorksDirectionGrid({
required this.direction,
required this.onDirectionChange,
});
final WipeDirection direction;
final ValueChanged<WipeDirection> onDirectionChange;
@override
Widget build(BuildContext context) {
return Column(
mainAxisSize: MainAxisSize.min,
children: [
Row(
mainAxisSize: MainAxisSize.min,
children: [
_HowItWorksDirectionButton(
icon: Symbols.north_west,
description: 'Bottom-right to top-left',
selected: direction == WipeDirection.bottomRightToTopLeft,
onPressed: () =>
onDirectionChange(WipeDirection.bottomRightToTopLeft),
),
const SizedBox(width: 4),
_HowItWorksDirectionButton(
icon: Symbols.keyboard_arrow_up,
description: 'Bottom to top',
selected: direction == WipeDirection.bottomToTop,
onPressed: () => onDirectionChange(WipeDirection.bottomToTop),
),
const SizedBox(width: 4),
_HowItWorksDirectionButton(
icon: Symbols.north_east,
description: 'Bottom-left to top-right',
selected: direction == WipeDirection.bottomLeftToTopRight,
onPressed: () =>
onDirectionChange(WipeDirection.bottomLeftToTopRight),
),
],
),
const SizedBox(height: 4),
Row(
mainAxisSize: MainAxisSize.min,
children: [
_HowItWorksDirectionButton(
icon: Symbols.keyboard_arrow_left,
description: 'Right to left',
selected: direction == WipeDirection.rightToLeft,
onPressed: () => onDirectionChange(WipeDirection.rightToLeft),
),
const SizedBox(width: 4),
const SizedBox(width: 44, height: 44),
_HowItWorksDirectionButton(
icon: Symbols.keyboard_arrow_right,
description: 'Left to right',
selected: direction == WipeDirection.leftToRight,
onPressed: () => onDirectionChange(WipeDirection.leftToRight),
),
],
),
const SizedBox(height: 4),
Row(
mainAxisSize: MainAxisSize.min,
children: [
_HowItWorksDirectionButton(
icon: Symbols.south_west,
description: 'Top-right to bottom-left',
selected: direction == WipeDirection.topRightToBottomLeft,
onPressed: () =>
onDirectionChange(WipeDirection.topRightToBottomLeft),
),
const SizedBox(width: 4),
_HowItWorksDirectionButton(
icon: Symbols.keyboard_arrow_down,
description: 'Top to bottom',
selected: direction == WipeDirection.topToBottom,
onPressed: () => onDirectionChange(WipeDirection.topToBottom),
),
const SizedBox(width: 4),
_HowItWorksDirectionButton(
icon: Symbols.south_east,
description: 'Top-left to bottom-right',
selected: direction == WipeDirection.topLeftToBottomRight,
onPressed: () =>
onDirectionChange(WipeDirection.topLeftToBottomRight),
),
],
),
],
);
}
}
class _HowItWorksDirectionButton extends StatefulWidget {
const _HowItWorksDirectionButton({
required this.icon,
required this.description,
required this.selected,
required this.onPressed,
});
final IconData icon;
final String description;
final bool selected;
final VoidCallback onPressed;
@override
State<_HowItWorksDirectionButton> createState() =>
_HowItWorksDirectionButtonState();
}
class _HowItWorksDirectionButtonState extends State<_HowItWorksDirectionButton>
with SingleTickerProviderStateMixin {
bool _hovered = false;
bool _pressed = false;
late final AnimationController _scaleController = AnimationController(
vsync: this,
lowerBound: 0.92,
upperBound: 1.08,
value: 1,
);
@override
void dispose() {
_scaleController.dispose();
super.dispose();
}
double get _scaleTarget => _pressed ? 0.92 : (_hovered ? 1.08 : 1);
void _setPressed(bool value) {
if (_pressed == value) return;
setState(() => _pressed = value);
_animateScale();
}
void _setHovered(bool value) {
if (_hovered == value) return;
setState(() => _hovered = value);
_animateScale();
}
void _animateScale() {
final double target = _scaleTarget;
_animateScaleWithSpring(
_scaleController,
target,
stiffness: 500,
dampingRatio: 1,
);
}
@override
Widget build(BuildContext context) {
final colors = Theme.of(context).colorScheme;
final background = widget.selected
? colors.primaryContainer
: colors.appSurfaceVariant.withValues(alpha: 0.3);
final iconColor =
widget.selected ? colors.onPrimaryContainer : colors.onSurfaceVariant;
return Semantics(
selected: widget.selected,
button: true,
label: widget.description,
child: GestureDetector(
onTapDown: (_) => _setPressed(true),
onTapUp: (_) => _setPressed(false),
onTapCancel: () => _setPressed(false),
onTap: widget.onPressed,
child: MouseRegion(
cursor: SystemMouseCursors.click,
onEnter: (_) => _setHovered(true),
onExit: (_) => _setHovered(false),
child: AnimatedBuilder(
animation: _scaleController,
builder: (_, child) => Transform.scale(
alignment: Alignment.center,
scale: _scaleController.value,
child: child,
),
child: Container(
width: 44,
height: 44,
decoration: BoxDecoration(
color: background,
borderRadius: BorderRadius.circular(12),
),
child: Icon(
widget.icon,
size: 24,
color: iconColor,
),
),
),
),
),
);
}
}
class _HowItWorksStep extends StatelessWidget {
const _HowItWorksStep({
required this.title,
required this.frameHeight,
required this.child,
});
final String title;
final double frameHeight;
final Widget child;
@override
Widget build(BuildContext context) {
return Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
SizedBox(
height: frameHeight,
width: double.infinity,
child: Center(child: child),
),
const SizedBox(height: 6),
Text(
title,
style: Theme.of(context).textTheme.labelMedium,
textAlign: TextAlign.center,
maxLines: 1,
),
],
);
}
}
class _HowItWorksBoundaryPainterWrapper extends CustomPainter {
_HowItWorksBoundaryPainterWrapper({
required this.progress,
required this.direction,
required this.color,
});
final double progress;
final WipeDirection direction;
final Color color;
@override
void paint(Canvas canvas, Size canvasSize) {
final line = buildWipeBoundaryLine(
width: canvasSize.width,
height: canvasSize.height,
progress: progress,
direction: direction,
);
if (line == null) return;
canvas.drawLine(
line.start,
line.end,
Paint()
..color = color
..strokeWidth = 2
..style = PaintingStyle.stroke,
);
}
@override
bool shouldRepaint(
covariant _HowItWorksBoundaryPainterWrapper oldDelegate,
) {
return oldDelegate.progress != progress ||
oldDelegate.direction != direction;
}
}
class AnimatedMeshBackground extends StatefulWidget {
const AnimatedMeshBackground({
required this.seedColor,
required this.isDark,
super.key,
});
final Color seedColor;
final bool isDark;
@override
State<AnimatedMeshBackground> createState() => _AnimatedMeshBackgroundState();
}
class _AnimatedMeshBackgroundState extends State<AnimatedMeshBackground>
with SingleTickerProviderStateMixin {
late final AnimationController _controller = AnimationController(
vsync: this,
duration: const Duration(seconds: 35),
)..repeat();
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
final base =
widget.isDark ? const Color(0xFF0D0D0D) : const Color(0xFFFAFAFA);
return AnimatedBuilder(
animation: _controller,
builder: (context, _) {
final offset = _controller.value * 2 * 3.14159;
return CustomPaint(
painter: _AnimatedMeshPainter(
seedColor: widget.seedColor,
phase: offset,
baseColor: base,
),
child: const SizedBox.expand(),
);
},
);
}
}
class _AnimatedMeshPainter extends CustomPainter {
_AnimatedMeshPainter({
required this.seedColor,
required this.phase,
required this.baseColor,
});
final Color seedColor;
final double phase;
final Color baseColor;
@override
void paint(Canvas canvas, Size size) {
final paint = Paint()
..shader = RadialGradient(
colors: [seedColor.withValues(alpha: 0.04), Colors.transparent],
).createShader(
Rect.fromCircle(
center: Offset(
size.width / 2 + (math.cos(phase) * 100),
size.height / 3 + (math.sin(phase) * 50),
),
radius: 500,
),
);
canvas
..drawRect(Offset.zero & size, Paint()..color = baseColor)
..drawCircle(
Offset(
size.width / 2 + math.cos(phase) * 100,
size.height / 3 + math.sin(phase) * 50,
),
500,
paint,
);
}
@override
bool shouldRepaint(covariant _AnimatedMeshPainter oldDelegate) =>
oldDelegate.phase != phase ||
oldDelegate.seedColor != seedColor ||
oldDelegate.baseColor != baseColor;
}Metadata
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downloads
Publisher
unverified uploader
Weekly Downloads
Metadata
Polished wipe-style icon transitions for Flutter with diagonal, horizontal, and vertical directions.
Repository (GitHub)
View/report issues
Topics
#animation #icons #flutter #transitions
License
unknown (license)
