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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