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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