Product Page section expanding animation #267
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,59 +1,101 @@ | ||
| import 'dart:math'; | ||
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| import 'package:flutter/cupertino.dart'; | ||
| import 'package:flutter/material.dart'; | ||
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| class SmoothExpandableCard extends StatefulWidget { | ||
| const SmoothExpandableCard({ | ||
| @required this.collapsedHeader, | ||
| @required this.content, | ||
| this.expandedHeader, | ||
| this.background, | ||
| }); | ||
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| final Widget collapsedHeader; | ||
| final Widget expandedHeader; | ||
| final Color background; | ||
| final Widget content; | ||
| @override | ||
| _SmoothExpandableCardState createState() => _SmoothExpandableCardState(); | ||
| } | ||
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| class _SmoothExpandableCardState extends State<SmoothExpandableCard> | ||
| with SingleTickerProviderStateMixin { | ||
| bool collapsed = true; | ||
| AnimationController _controller; | ||
| Animation<double> animation; | ||
| static const Duration _ANIMATION_DURATION = Duration(milliseconds: 160); | ||
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| @override | ||
| void initState() { | ||
| super.initState(); | ||
| _controller = | ||
| AnimationController(vsync: this, duration: _ANIMATION_DURATION); | ||
| animation = Tween<double>(begin: 0, end: pi).animate(_controller); | ||
| } | ||
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| @override | ||
| void dispose() { | ||
| _controller.dispose(); | ||
| super.dispose(); | ||
| } | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return AnimatedCrossFade( | ||
| duration: _ANIMATION_DURATION, | ||
| crossFadeState: CrossFadeState.showFirst, | ||
| firstChild: _buildCard(), | ||
| secondChild: _buildCard(), | ||
| ); | ||
| } | ||
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| Widget _buildCard() { | ||
| return GestureDetector( | ||
| onTap: () { | ||
| setState(() { | ||
| collapsed = !collapsed; | ||
| animation.value == 0 ? _controller.forward() : _controller.reverse(); | ||
| }); | ||
| }, | ||
| child: Padding( | ||
| padding: const EdgeInsets.only( | ||
| right: 8.0, left: 8.0, top: 4.0, bottom: 20.0), | ||
| child: Material( | ||
| elevation: 8.0, | ||
| shadowColor: Colors.black45, | ||
| borderRadius: const BorderRadius.all(Radius.circular(10.0)), | ||
| color: widget.background ?? Theme.of(context).colorScheme.surface, | ||
| child: Container( | ||
| padding: const EdgeInsets.all(12.0), | ||
| child: Column( | ||
| children: <Widget>[ | ||
| Row( | ||
| mainAxisSize: MainAxisSize.max, | ||
| mainAxisAlignment: MainAxisAlignment.spaceBetween, | ||
| crossAxisAlignment: CrossAxisAlignment.start, | ||
| children: <Widget>[ | ||
| Container( | ||
| child: collapsed | ||
| ? widget.collapsedHeader | ||
|
There was a problem hiding this comment. Just curious: could we just use one header that works for the collapse and expanded states? There was a problem hiding this comment. @monsieurtanuki the expanded header is now only optional, great idea |
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| : widget.expandedHeader), | ||
| AnimatedBuilder( | ||
| animation: animation, | ||
| child: const Icon(Icons.keyboard_arrow_down), | ||
| builder: (BuildContext context, Widget child) { | ||
| return Transform.rotate( | ||
| angle: animation.value, | ||
| child: child, | ||
| ); | ||
| }, | ||
| ), | ||
| ], | ||
| ), | ||
| if (collapsed != true) widget.content, | ||
| ], | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
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@M123-dev : I think this is causing #270 . header should be required, or we should test if it is null. The AttributeListExpandable does not set it.