sliding_sheet 0.2.1 
sliding_sheet: ^0.2.1 copied to clipboard
A widget that can be dragged and scrolled in a single gesture and snapped to a list of extents.
import 'package:flutter/material.dart';
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
import 'package:sliding_sheet/sliding_sheet.dart';
import 'package:example/util/util.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
SheetController controller;
GlobalKey headerKey;
GlobalKey footerKey;
double headerHeight = 0;
double footerHeight = 0;
final textStyle = TextStyle(
color: Colors.black,
fontFamily: 'sans-serif-medium',
fontSize: 15,
);
final mapsBlue = Color(0xFF4185F3);
SheetState state;
bool get isExpanded => state?.isExpanded ?? false;
bool get isCollapsed => state?.isCollapsed ?? true;
double get progress => state?.progress ?? 0.0;
@override
void initState() {
super.initState();
headerKey = GlobalKey();
footerKey = GlobalKey();
controller = SheetController();
WidgetsBinding.instance.addPostFrameCallback((_) {
final RenderBox header = headerKey?.currentContext?.findRenderObject();
final RenderBox footer = footerKey?.currentContext?.findRenderObject();
if (header != null && footer != null) {
headerHeight = header.size.height;
footerHeight = footer.size.height;
setState(() {});
}
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Example App',
debugShowCheckedModeBanner: false,
home: Builder(
builder: (context) {
return Scaffold(
body: Stack(
children: <Widget>[
buildMap(),
Align(
alignment: Alignment.topRight,
child: Padding(
padding: EdgeInsets.fromLTRB(0, MediaQuery.of(context).padding.top + 16, 16, 0),
child: FloatingActionButton(
child: Icon(
Icons.layers,
color: mapsBlue,
),
backgroundColor: Colors.white,
onPressed: () {
showBottomSheet(context);
},
),
),
),
buildSheet(),
],
),
);
},
),
);
}
Widget buildSheet() {
return LayoutBuilder(
builder: (context, constraints) {
final height = constraints.biggest.height;
return SlidingSheet(
controller: controller,
color: Colors.white,
elevation: 16,
maxWidth: 500,
cornerRadius: 16 * (1 - interval(0.7, 1.0, progress)),
border: Border.all(
color: Colors.grey.shade300,
width: 3,
),
snapSpec: SnapSpec(
snap: true,
positioning: SnapPositioning.pixelOffset,
snappings: [
headerHeight > 0 ? headerHeight + footerHeight : 140,
height * 0.7,
double.infinity,
],
onSnap: (state, snap) {
print('Snapped to $snap');
},
),
scrollSpec: ScrollSpec.bouncingScroll(),
listener: (state) {
this.state = state;
setState(() {});
},
headerBuilder: buildHeader,
footerBuilder: buildFooter,
builder: buildChild,
);
},
);
}
Widget buildHeader(BuildContext context, SheetState state) {
return CustomContainer(
key: headerKey,
animate: true,
color: Colors.white,
padding: const EdgeInsets.symmetric(horizontal: 16),
elevation: !state.isAtTop ? 4 : 0,
shadowColor: Colors.black12,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
SizedBox(height: 2 + (MediaQuery.of(context).padding.top * interval(.7, 1.0, progress))),
Align(
alignment: Alignment.topCenter,
child: CustomContainer(
width: 16,
height: 4,
borderRadius: 2,
color: Colors.grey.withOpacity(.5 * (1 - interval(0.7, 1.0, progress))),
),
),
SizedBox(height: 8),
Row(
children: <Widget>[
Text(
'5h 36m',
style: textStyle.copyWith(
color: Color(0xFFF0BA64),
fontSize: 22,
),
),
SizedBox(width: 8),
Text(
'(353 mi)',
style: textStyle.copyWith(
color: Colors.grey.shade600,
fontSize: 21,
),
),
],
),
SizedBox(height: 8),
Text(
'Fastest route now due to traffic conditions.',
style: textStyle.copyWith(
color: Colors.grey,
fontSize: 16,
),
),
SizedBox(height: 8),
],
),
);
}
Widget buildFooter(BuildContext context, SheetState state) {
Widget button(Icon icon, Text text, VoidCallback onTap, {BorderSide border, Color color}) {
final child = Row(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
icon,
SizedBox(width: 8),
text,
],
);
final shape = RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(18)),
);
return border == null
? RaisedButton(
color: color,
onPressed: onTap,
elevation: 2,
child: child,
shape: shape,
)
: OutlineButton(
color: color,
onPressed: onTap,
child: child,
borderSide: border,
shape: shape,
);
}
return CustomContainer(
key: footerKey,
animate: true,
elevation: !isCollapsed && !state.isAtBottom ? 4 : 0,
shadowDirection: ShadowDirection.top,
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
color: Colors.white,
shadowColor: Colors.black12,
child: Row(
children: <Widget>[
button(
Icon(
Icons.navigation,
color: Colors.white,
),
Text(
'Start',
style: textStyle.copyWith(
color: Colors.white,
fontSize: 15,
),
),
() async {
await controller.hide();
Future.delayed(const Duration(milliseconds: 1500), () {
controller.show();
});
},
color: mapsBlue,
),
SizedBox(width: 8),
button(
Icon(
!isExpanded ? Icons.list : Icons.map,
color: mapsBlue,
),
Text(
!isExpanded ? 'Steps & more' : 'Show map',
style: textStyle.copyWith(
fontSize: 15,
),
),
!isExpanded ? () => controller.scrollTo(230) : controller.collapse,
color: Colors.white,
border: BorderSide(
color: Colors.grey.shade400,
width: 2,
),
),
],
),
);
}
Widget buildChild(BuildContext context, SheetState state) {
final divider = Container(
height: 1,
color: Colors.grey.shade300,
);
final titleStyle = textStyle.copyWith(
fontSize: 16,
fontWeight: FontWeight.w600,
);
final padding = const EdgeInsets.symmetric(horizontal: 16);
return Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
divider,
SizedBox(height: 32),
Padding(
padding: padding,
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Traffic',
style: titleStyle,
),
SizedBox(height: 16),
buildChart(context),
],
),
),
SizedBox(height: 32),
divider,
SizedBox(height: 32),
Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Padding(
padding: padding,
child: Text(
'Steps',
style: titleStyle,
),
),
SizedBox(height: 8),
buildSteps(context),
],
),
SizedBox(height: 32),
divider,
SizedBox(height: 32),
Icon(
MdiIcons.githubCircle,
color: Colors.grey.shade900,
size: 48,
),
SizedBox(height: 16),
Align(
alignment: Alignment.center,
child: Text(
'Pull request are welcome!',
style: textStyle.copyWith(
color: Colors.grey.shade700,
),
textAlign: TextAlign.center,
),
),
SizedBox(height: 8),
Align(
alignment: Alignment.center,
child: Text(
'(Stars too)',
style: textStyle.copyWith(
fontSize: 12,
color: Colors.grey,
),
),
),
SizedBox(height: 32),
],
);
}
Widget buildSteps(BuildContext context) {
final steps = [
Step('Go to your pubspec.yaml file.', '2 seconds'),
Step("Add the newest version of 'sliding_sheet' to your dependencies.", '5 seconds'),
Step("Run 'flutter packages get' in the terminal.", '4 seconds'),
Step("Happy coding!", 'Forever'),
];
return ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
itemCount: steps.length,
itemBuilder: (context, i) {
final step = steps[i];
return Padding(
padding: const EdgeInsets.fromLTRB(56, 16, 0, 0),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
step.instruction,
style: textStyle.copyWith(
fontSize: 16,
),
),
SizedBox(height: 16),
Row(
children: <Widget>[
Text(
'${step.time}',
style: textStyle.copyWith(
color: Colors.grey,
fontSize: 15,
),
),
SizedBox(width: 16),
Expanded(
child: Container(
height: 1,
color: Colors.grey.shade300,
),
)
],
),
SizedBox(height: 8),
],
),
);
},
);
}
Widget buildChart(BuildContext context) {
final series = [
charts.Series<Traffic, String>(
id: 'traffic',
data: [
Traffic(0.5, '14:00'),
Traffic(0.6, '14:30'),
Traffic(0.5, '15:00'),
Traffic(0.7, '15:30'),
Traffic(0.8, '16:00'),
Traffic(0.6, '16:30'),
],
colorFn: (traffic, __) {
if (traffic.time == '14:30') return charts.Color.fromHex(code: '#F0BA64');
return charts.MaterialPalette.gray.shade300;
},
domainFn: (Traffic traffic, _) => traffic.time,
measureFn: (Traffic traffic, _) => traffic.intesity,
),
];
return Container(
height: 128,
child: charts.BarChart(
series,
animate: true,
domainAxis: charts.OrdinalAxisSpec(
renderSpec: charts.SmallTickRendererSpec(
labelStyle: charts.TextStyleSpec(
fontSize: 12, // size in Pts.
color: charts.MaterialPalette.gray.shade500,
),
),
),
defaultRenderer: charts.BarRendererConfig(
cornerStrategy: const charts.ConstCornerStrategy(5),
),
),
);
}
Future showBottomSheet(BuildContext context) async {
final dialogController = SheetController();
double progress = 0;
double multiple = 1;
await showSlidingBottomSheet(
context,
builder: (context) {
return SlidingSheetDialog(
controller: dialogController,
snapSpec: const SnapSpec(
snap: true,
snappings: const [0.4, 0.7, 1.0],
),
scrollSpec: ScrollSpec.bouncingScroll(),
color: Colors.white,
cornerRadius: 16 * multiple,
listener: (state) {
progress = state.progress;
multiple = 1 - interval(0.7, 1.0, progress);
if (state.extent >= 0.7 || (state.isExpanded && state.scrollOffset < 8.0)) {
dialogController.rebuild();
}
},
headerBuilder: (context, state) {
final theme = Theme.of(context);
final textTheme = theme.textTheme;
return Material(
elevation: interval(0.0, 8.0, state.scrollOffset) * 4,
shadowColor: Colors.black,
color: Colors.white,
child: Container(
padding: EdgeInsets.fromLTRB(
16,
16 + (MediaQuery.of(context).viewPadding.top * (1 - multiple)),
16,
16,
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Header',
style: textTheme.headline,
),
Stack(
children: <Widget>[
IgnorePointer(
ignoring: progress > 0.7,
child: Opacity(
opacity: 1 - interval(0.7, 0.85, progress),
child: IconButton(
icon: Icon(Icons.keyboard_arrow_up),
onPressed: dialogController.expand,
),
),
),
IgnorePointer(
ignoring: progress < 1.0,
child: Opacity(
opacity: interval(0.85, 1.0, progress),
child: IconButton(
icon: Icon(Icons.keyboard_arrow_down),
onPressed: () => Navigator.pop(context),
),
),
),
],
)
],
),
),
);
},
builder: (context, state) {
return Container(
height: 1200,
color: Colors.white,
child: Center(
child: Text(
'This is a bottom sheet dialog!',
style: textStyle,
),
),
);
},
);
},
);
}
Widget buildMap() {
return Column(
children: <Widget>[
Expanded(
child: Image.asset(
'assets/maps_screenshot.png',
width: double.infinity,
height: double.infinity,
alignment: Alignment.center,
fit: BoxFit.cover,
),
),
SizedBox(height: 56),
],
);
}
}
class Step {
final String instruction;
final String time;
Step(
this.instruction,
this.time,
);
}
class Traffic {
final double intesity;
final String time;
Traffic(
this.intesity,
this.time,
);
}Metadata
635
likes
0
pub points
93%
popularity
Publisher
unverified uploader
Metadata
A widget that can be dragged and scrolled in a single gesture and snapped to a list of extents.
Repository (GitHub)
View/report issues
License
unknown (license)
