flutter实现带删除动画的listview功能
个人开发app中，需要开发一个带有删除功能的ListView
效果如下
需求动画分析
列表可以滚动用listView，
有两个动画，第一个动画是透明度变化，第二个是size变化
是顺序执行
实现过程
新建一个动画页面进行单独控制
记得用statefulwidget类，这第二个动画之间涉及到页面刷新切换widget
记得with tickerproviderstatemixin 这个是动画类状态管理的必备
class AnimationListItem extends StatefulWidget {
AnimationListItem();
@override
_AnimationListItemState createState() => _AnimationListItemState();
}
class _AnimationListItemState extends State<AnimationListItem>
with TickerProviderStateMixin {
@override
Widget build(BuildContext context) {
// TODO: implement build
return Container();
}
}
动画流程
声明
//控制器 AnimationController lucencyController; AnimationController sizeController; // 动画 Animation<double> lucencyAnimation; Animation<double> sizeAnimation;
初始化
///必须在initstate这个生命周期进行初始化
@override
void initState() {
// TODO: implement initState
super.initState();
lucencyController =
AnimationController(vsync: this, duration: Duration(milliseconds: 150));
lucencyAnimation = Tween(begin: 1.0, end: 0.0).animate(
CurvedAnimation(parent: lucencyController, curve: Curves.easeOut));
sizeController =
AnimationController(vsync: this, duration: Duration(milliseconds: 250));
sizeAnimation = Tween(begin: 1.0, end: 0.0).animate(
CurvedAnimation(parent: sizeController, curve: Curves.easeOut));
}
注销
@override
void dispose() {
lucencyController.dispose();
sizeController.dispose();
super.dispose();
}
最后内容呈现
class AnimationListItem extends StatefulWidget {
AnimationListItem();
@override
_AnimationListItemState createState() => _AnimationListItemState();
}
class _AnimationListItemState extends State<AnimationListItem>
with TickerProviderStateMixin {
AnimationController lucencyController;
AnimationController sizeController;
Animation<double> lucencyAnimation;
Animation<double> sizeAnimation;
bool isChange = false;
@override
void initState() {
// TODO: implement initState
super.initState();
lucencyController =
AnimationController(vsync: this, duration: Duration(milliseconds: 150));
lucencyAnimation = Tween(begin: 1.0, end: 0.0).animate(
CurvedAnimation(parent: lucencyController, curve: Curves.easeOut));
sizeController =
AnimationController(vsync: this, duration: Duration(milliseconds: 250));
sizeAnimation = Tween(begin: 1.0, end: 0.0).animate(
CurvedAnimation(parent: sizeController, curve: Curves.easeOut));
}
@override
Widget build(BuildContext context) {
return buildItemBox();
}
@override
void dispose() {
lucencyController.dispose();
sizeController.dispose();
super.dispose();
}
Widget buildItemBox() {
return isChange
? SizeTransition(
axis: Axis.vertical,
sizeFactor: sizeAnimation,
child: Container(
height: duSetWidth(100),
width: double.infinity,
),
)
: FadeTransition(
opacity: lucencyAnimation,
child: Container(
alignment: Alignment.center,
padding: EdgeInsets.only(
left: duSetWidth(15),
right: duSetWidth(15),
),
height: duSetWidth(100),
child: buildRow(),
),
);
}
Widget buildRow() {
///设置显示的样式
bool _isSub = false;
Color _isSubColor = Color.fromRGBO(245, 77, 130, 1);
Color _isSubBackColor = Colors.transparent;
Widget isSubWidget = InkWell(
child: Container(
alignment: Alignment.center,
width: duSetWidth(55),
height: duSetWidth(28),
decoration: BoxDecoration(
color: _isSubBackColor,
border: Border.all(color: _isSubColor),
borderRadius: BorderRadius.circular(duSetWidth(15)),
),
child: Text(
'+ 书架',
style: TextStyle(
color: _isSubColor,
),
),
),
onTap: () {
if (_isSub)
print('dasd');
else
print('dsada');
},
);
return Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Container(
width: duSetWidth(60),
height: duSetWidth(80),
child: ClipRRect(
borderRadius: BorderRadius.circular(duSetWidth(5)),
child: Image.network(
'https://gimg2.baidu.com/image_search/src=http%3A%2F%2F00.minipic.eastday.com%2F20170307%2F20170307164725_114ea3c04f605e59bd10699f37870267_13.jpeg&refer=http%3A%2F%2F00.minipic.eastday.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1623596389&t=946dba98698d8d67d773ea8f7af55f45',
fit: BoxFit.cover,
),
),
),
Container(
width: duSetWidth(155),
height: duSetWidth(80),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Container(
height: duSetWidth(25),
alignment: Alignment.centerLeft,
width: double.infinity,
child: Text(
'这是标题',
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(
color: Colors.white,
fontSize: duSetFontSize(16),
),
),
),
Container(
height: duSetWidth(20),
alignment: Alignment.centerLeft,
width: double.infinity,
child: Text(
'这是副标题',
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(
color: Color.fromRGBO(162, 168, 186, 1),
fontSize: duSetFontSize(14),
),
),
),
],
),
),
Container(
width: duSetWidth(100),
height: duSetWidth(80),
padding: EdgeInsets.only(
top: duSetWidth(4),
),
alignment: Alignment.center,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
isSubWidget,
InkWell(
onTap: () async {
await lucencyController.forward();
setState(() {
isChange = true;
sizeController.forward();
});
},
child: Container(
alignment: Alignment.center,
width: duSetWidth(35),
height: duSetWidth(28),
decoration: BoxDecoration(
border: Border.all(
color: Color.fromRGBO(113, 118, 140, 1),
),
borderRadius: BorderRadius.circular(duSetWidth(15)),
),
child: Icon(
Icons.delete,
color: Color.fromRGBO(113, 118, 140, 1),
size: duSetFontSize(16),
),
),
),
],
),
)
],
);
}
}
dusetwidth是我自定义的函数可以不用管，自己替换
下列是在页面使用
class HistoryPage extends StatefulWidget {
@override
_HistoryPageState createState() => _HistoryPageState();
}
class _HistoryPageState extends State<HistoryPage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: ListView(
children: [
AnimationListItem(),
AnimationListItem(),
AnimationListItem(),
AnimationListItem(),
],
),
);
}
/// 构造appbar
Widget buildAppabr() {
return AppBar(
backgroundColor: Color.fromRGBO(33, 39, 46, 1),
brightness: Brightness.dark,
centerTitle: true,
title: Text(
'浏览记录',
style: TextStyle(
fontSize: duSetFontSize(16),
color: Colors.white,
),
),
leading: IconButton(
icon: Icon(
Icons.arrow_back_ios,
color: Colors.white,
size: duSetFontSize(18),
),
onPressed: () {
Get.back();
},
),
);
}
}
这个我原来是准备使用animatedList来进行实现的，最后发现，animatedList里面只能设置移除动画，不能实现补位动画
第一个透明度的动画就是移除动画，第二个size变化就是补位动画，
animatedList没有补位，所以下方list直接移动上去会显得非常突兀，我看了看源码，修改较为麻烦。所以就直接用动画变换来写
这个List内的内容，并不是直接移除，而是替换成高低为0 的一个盒子
如果有animatedList简单的改造实现的补位动画，希望留言给我地址，非常感谢
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