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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_slidable/flutter_slidable.dart'; | ||
|
|
||
| void main() => runApp(const MyApp()); | ||
|
|
||
| class MyApp extends StatelessWidget { | ||
| const MyApp({ | ||
| Key? key, | ||
| }) : super(key: key); | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return MaterialApp( | ||
| title: 'Slidable Example', | ||
| home: Scaffold( | ||
| body: ListView( | ||
| children: const [ | ||
| ListItem( | ||
| title: 'ERIC', | ||
| subtitle: 'Subtitle 1', | ||
| ), | ||
| ListItem( | ||
| title: 'ERIC', | ||
| subtitle: 'Subtitle 2', | ||
| ), | ||
| ListItem( | ||
| title: 'ERIC', | ||
| subtitle: 'Subtitle 3', | ||
| ), | ||
| ListItem( | ||
| title: 'ERIC', | ||
| subtitle: 'Subtitle 4', | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| class ListItem extends StatefulWidget { | ||
| const ListItem({ | ||
| Key? key, | ||
| required this.title, | ||
| required this.subtitle, | ||
| }) : super(key: key); | ||
|
|
||
| final String title; | ||
| final String subtitle; | ||
|
|
||
| @override | ||
| State<ListItem> createState() => _ListItemState(); | ||
| } | ||
|
|
||
| class _ListItemState extends State<ListItem> { | ||
| final colorNotifier = ValueNotifier<Color>(Colors.grey); | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return SizedBox( | ||
| height: 50, | ||
| child: Slidable( | ||
| startActionPane: ActionPane( | ||
| closeThreshold: 0.5, | ||
| openThreshold: 0.6, | ||
| extentRatio: 0.5, | ||
| motion: const BehindMotion(), | ||
| children: [RememberedArea(colorNotifier: colorNotifier)], | ||
| ), | ||
| child: Row( | ||
| children: [ | ||
| Hint(colorNotifier: colorNotifier), | ||
| Expanded( | ||
| child: Item( | ||
| title: widget.title, | ||
| subtitle: widget.subtitle, | ||
| ), | ||
| ) | ||
| ], | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| class RememberedArea extends StatefulWidget { | ||
| RememberedArea({ | ||
| Key? key, | ||
| required this.colorNotifier, | ||
| ColorTween? colorTween, | ||
| }) : colorTween = colorTween ?? | ||
| ColorTween( | ||
| begin: Colors.yellow, | ||
| end: Colors.green, | ||
| ), | ||
| super(key: key); | ||
|
|
||
| final ColorTween colorTween; | ||
| final ValueNotifier<Color> colorNotifier; | ||
|
|
||
| @override | ||
| State<RememberedArea> createState() => _RememberedAreaState(); | ||
| } | ||
|
|
||
| class _RememberedAreaState extends State<RememberedArea> { | ||
| double maxValue = 0; | ||
| late final animation = Slidable.of(context)!.animation; | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
| animation.addListener(handleValueChanged); | ||
| animation.addStatusListener(handleStatusChanged); | ||
| } | ||
|
|
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| double get colorValue => animation.value * 2; | ||
| Color get color => widget.colorTween.lerp(colorValue)!; | ||
|
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| void handleValueChanged() { | ||
| if (colorValue > maxValue) { | ||
| maxValue = colorValue; | ||
| widget.colorNotifier.value = color; | ||
| } | ||
| } | ||
|
|
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| void handleStatusChanged(AnimationStatus status) { | ||
| if (status == AnimationStatus.dismissed) { | ||
| maxValue = 0; | ||
| } | ||
| } | ||
|
|
||
| @override | ||
| void dispose() { | ||
| animation.removeListener(handleValueChanged); | ||
| animation.removeStatusListener(handleStatusChanged); | ||
| super.dispose(); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return AnimatedBuilder( | ||
| animation: animation, | ||
| builder: (context, child) { | ||
| return Expanded( | ||
| child: SizedBox.expand( | ||
| child: ColoredBox(color: color), | ||
| ), | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| class Hint extends StatelessWidget { | ||
| const Hint({ | ||
| Key? key, | ||
| required this.colorNotifier, | ||
| }) : super(key: key); | ||
|
|
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| final ValueNotifier<Color> colorNotifier; | ||
|
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| return ValueListenableBuilder<Color>( | ||
| valueListenable: colorNotifier, | ||
| builder: (context, color, child) { | ||
| return Container(width: 8, color: color); | ||
| }, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| class Item extends StatelessWidget { | ||
| const Item({ | ||
| Key? key, | ||
| required this.title, | ||
| required this.subtitle, | ||
| }) : super(key: key); | ||
|
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| final String title; | ||
| final String subtitle; | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| final textTheme = Theme.of(context).textTheme; | ||
| return Padding( | ||
| padding: const EdgeInsets.only(left: 8), | ||
| child: Column( | ||
| crossAxisAlignment: CrossAxisAlignment.start, | ||
| children: [ | ||
| Expanded(child: Text(title, style: textTheme.bodyText1)), | ||
| Expanded(child: Text(subtitle, style: textTheme.bodyText2)), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
| } |
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