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颤振动画:如何保持父控件的位置

flutter-animation dart flutter

DreamsInHD · 技术社区 · 6 年前

我在拍《颤栗》的动画时遇到了一些麻烦。有三个圆圈彼此相邻。当其中一个被按下时,我希望它膨胀和折叠。动画可以工作,但当发生这种情况时,整排圆向下移动,以保持圆所在行的上边距。如何确保行保持其原始位置?

我只是将动画应用到中心圆来测试它。很抱歉,如果代码很混乱,那是因为我在测试这个。这是动画和动画控制器:

    _animationController =
        AnimationController(vsync: this, duration: Duration(milliseconds: 200));
    _animation = Tween(begin: 0.25, end: 0.35).animate(
        CurvedAnimation(parent: _animationController, curve: Curves.elasticIn))
      ..addStatusListener((status) {
        if (status == AnimationStatus.completed) {
          _animationController.reverse();
        }
      });

Column(
        children: <Widget>[
Container(
            margin: EdgeInsets.only(top: 16.0),
            child: Center(
              child: Text(
                'Circles',
                style: TextStyle(fontSize: 18),
              ),
            ),
          ),
Container(
            margin: EdgeInsets.only(top: 8.0),
            child: Row(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                Container(
                  width: MediaQuery.of(context).size.width * 0.25,
                  height: MediaQuery.of(context).size.height * 0.2,
                  margin: EdgeInsets.symmetric(horizontal: 8.0),
                  child: Center(child: Text('Circle')),
                  decoration: BoxDecoration(
                      shape: BoxShape.circle,
                      border: Border.all(color: AppColors.primaryBlue)),
                ),
                AnimatedBuilder(
                  animation: _animation,
                  builder: (context, child) {
                    return GestureDetector(
                      onTap: () {
                        _animationController.forward();
                      },
                      child: Container(
                        width: MediaQuery.of(context).size.width *
                            _animation.value,
                        height: MediaQuery.of(context).size.height *
                            _animation.value,
                        margin: EdgeInsets.symmetric(horizontal: 8.0),
                        child: Center(child: Text('Circle')),
                        decoration: BoxDecoration(
                            shape: BoxShape.circle,
                            border: Border.all(color: AppColors.primaryBlue)),
                      ),
                    );
                  },
                ),
                Container(
                  width: MediaQuery.of(context).size.width * 0.25,
                  height: MediaQuery.of(context).size.height * 0.2,
                  margin: EdgeInsets.symmetric(horizontal: 8.0),
                  child: Center(child: Text('Circle')),
                  decoration: BoxDecoration(
                      shape: BoxShape.circle,
                      border: Border.all(color: AppColors.primaryBlue)),
                )
              ],
            ),
          ),

你可能会注意到我对颤振中的动画还很陌生,所以其他的反馈也是非常欢迎的。谢谢!

0 回复 | 直到 6 年前

CopsOnRoad 6 年前

输出:

完整代码:

Column(
  children: <Widget>[
    Container(
      margin: EdgeInsets.only(top: 16.0),
      child: Center(
        child: Text(
          'Circles',
          style: TextStyle(fontSize: 18),
        ),
      ),
    ),
    Container(
      height: 200,
      margin: EdgeInsets.only(top: 8.0),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          Container(
            width: MediaQuery.of(context).size.width * 0.25,
            height: MediaQuery.of(context).size.height * 0.2,
            margin: EdgeInsets.symmetric(horizontal: 8.0),
            child: Center(child: Text('Circle')),
            decoration: BoxDecoration(shape: BoxShape.circle, border: Border.all(color: AppColors.primaryBlue)),
          ),
          Spacer(),
          AnimatedBuilder(
            animation: _animation,
            builder: (context, child) {
              return GestureDetector(
                onTap: () {
                  _animationController.forward();
                },
                child: Container(
                  width: MediaQuery.of(context).size.width * _animation.value,
                  height: MediaQuery.of(context).size.height * _animation.value,
                  margin: EdgeInsets.symmetric(horizontal: 8.0),
                  child: Center(child: Text('Circle')),
                  decoration: BoxDecoration(shape: BoxShape.circle, border: Border.all(color: AppColors.primaryBlue)),
                ),
              );
            },
          ),
          Spacer(),
          Container(
            width: MediaQuery.of(context).size.width * 0.25,
            height: MediaQuery.of(context).size.height * 0.2,
            margin: EdgeInsets.symmetric(horizontal: 8.0),
            child: Center(child: Text('Circle')),
            decoration: BoxDecoration(shape: BoxShape.circle, border: Border.all(color: AppColors.primaryBlue)),
          )
        ],
      ),
    ),
  ],
);

Fethi 6 年前

首先我建议你删除 mainAxisSize: MainAxisSize.min,