flutter - 动画 - "Toss"添加到购物车 动画在 flutter 中可用吗？

Question

有人在 flutter 中开发过如下动画吗？当我们点击添加到购物车时，我需要那种过渡类型的动画。让我知道是否有可用的插件。感谢您的帮助。 https://codepen.io/designcouch/pen/OJPdZxg

演示:

$(document).ready(function(){
  $('#addtocart').on('click',function(){
    
    var button = $(this);
    var cart = $('#cart');
    var cartTotal = cart.attr('data-totalitems');
    var newCartTotal = parseInt(cartTotal) + 1;
    
    button.addClass('sendtocart');
    setTimeout(function(){
      button.removeClass('sendtocart');
      cart.addClass('shake').attr('data-totalitems', newCartTotal);
      setTimeout(function(){
        cart.removeClass('shake');
      },500)
    },1000)
  })
})

html, body {
  height: 100%;
  min-height: 100%;
  font-family: "Helvetica Neue", "Helvetica", "Arial", sans-serif;
}
*, *:before, *:after {
  box-sizing: border-box;
}
.page-wrapper {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-wrapper button {
  padding: 20px;
  border: none;
  background: #d5d8e7;
  position: relative;
  outline: none;
  border-radius: 5px;
  color: #292d48;
  font-size: 18px;
}
.page-wrapper button .cart-item {
  position: absolute;
  height: 24px;
  width: 24px;
  top: -10px;
  right: -10px;
}
.page-wrapper button .cart-item:before {
  content: '1';
  display: block;
  line-height: 24px;
  height: 24px;
  width: 24px;
  font-size: 12px;
  font-weight: 600;
  background: #2bd156;
  color: white;
  border-radius: 20px;
  text-align: center;
}
.page-wrapper button.sendtocart .cart-item {
  display: block;
  animation: xAxis 1s forwards cubic-bezier(1, 0.44, 0.84, 0.165);
}
.page-wrapper button.sendtocart .cart-item:before {
  animation: yAxis 1s alternate forwards cubic-bezier(0.165, 0.84, 0.44, 1);
}
.cart {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  background: #292d48;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
}
.cart i {
  font-size: 25px;
  color: white;
}
.cart:before {
  content: attr(data-totalitems);
  font-size: 12px;
  font-weight: 600;
  position: absolute;
  top: -12px;
  right: -12px;
  background: #2bd156;
  line-height: 24px;
  padding: 0 5px;
  height: 24px;
  min-width: 24px;
  color: white;
  text-align: center;
  border-radius: 24px;
}
.cart.shake {
  animation: shakeCart 0.4s ease-in-out forwards;
}
@keyframes xAxis {
  100% {
    transform: translateX(calc(50vw - 105px));
  }
}
@keyframes yAxis {
  100% {
    transform: translateY(calc(-50vh + 75px));
  }
}
@keyframes shakeCart {
  25% {
    transform: translateX(6px);
  }
  50% {
    transform: translateX(-4px);
  }
  75% {
    transform: translateX(2px);
  }
  100% {
    transform: translateX(0);
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="cart" class="cart" data-totalitems="0">
  <i class="fas fa-shopping-cart"></i>
</div>

<div class="page-wrapper">
  <button id="addtocart">
    Add to Cart
    <span class="cart-item"></span>
  </button>
</div>

Answer 1

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  AnimationController _animationController;
double x,y;
  @override
  void initState() {
    x =0;
    y =0;
    _animationController = AnimationController(
      duration: const Duration(seconds: 5),
      vsync: this,
    );

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
 
    return Scaffold(
      body: Center(
      
          child: Container(
        child: ButtonTheme(
            buttonColor: Colors.blue,
            child: Stack(children: [
              AnimatedBuilder(
                animation: _animationController,
                child: Container(
                  child: Padding(
                    padding: const EdgeInsets.only(left: 13.0, top: 4),
                    child: RaisedButton(
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25.0),
                        side: BorderSide(
                          color: Colors.white,
                        ),
                      ),
                      child: new Padding(
                        padding: EdgeInsets.only(bottom: 3),
                        child: new Text(
                          '1',
                          textAlign: TextAlign.center,
                        ),
                      ),
                      onPressed: () {
                        setState(() {
                          x+=100;
                          y+=100;
                          _animationController.forward();


                        });
                      },
                    ),
                  ),
                ),
                builder: (BuildContext context, Widget child) {
                  return Transform.translate(
                    offset: (Offset(x,y)),
                    child: child);
                },
              ),
            ])),
      )),
    );
  }
}

借助AnimationController、Stack和Transition小部件，可以完成上述动画。我们通过指定坐标将小部件从一个位置移动到另一个位置(如果可能的话，没有坐标也可以)