随着div位置的变化平滑地给div设置动画 [英] Smoothly animate a div as its position changes

问题描述

我有一个绝对定位的div：

I have an absolutely positioned div:

class MyDiv extends React.Component {
  state = {
    stepCount: 0
  };

  componentDidMount(){
    setInterval(() => {
      this.setState({ stepCount: this.state.stepCount + 1 })
    }, 1000);
  }

  render(){
    return (<div style={{ left: this.state.stepCount * 10 + "%" }} />);
  }
}

CSS
div { transition: 1s linear; }

每秒钟，我将div左移10％。
我希望过渡看起来平滑，但会有一点停顿。

Every second, I translate the div left by 10%. I want the transitions to look smooth, but there is a slight stutter.

示例：
https：/ /codepen.io/anon/pen/QoNGbQ

推荐答案

您最好使用CSS转换或模块，例如react-spring，但如果它们都不适合您，则您需要 requestAnimationFrame 。

You're probably best off using CSS transforms or a module such as react-spring, but if neither of them suit you then you want requestAnimationFrame.

（CSS转换会使文字模糊 CSS过渡效果会使图像模糊/在Chrome中将图片移动1像素？，并且一次性使用，可能不希望外部模块捆绑加载）

(CSS Transforms can make text blurry CSS transition effect makes image blurry / moves image 1px, in Chrome? and for a one-off you might not want the bundle load of an external module)

https://codesandbox.io/s/pj9m554nkj

const animate = ({ timing, draw, duration }) => {
  let start = performance.now();

  const animateLoop = time => {
    const durationFraction = Math.min(
      1,
      Math.max(0, (time - start) / duration)
    );
    const progress = timing(durationFraction);
    draw(progress);
    if (durationFraction < 1) {
      requestAnimationFrame(animateLoop);
    }
  };

  requestAnimationFrame(animateLoop);
};

const MovingDiv = ({ move, duration }) => {
  const [pos, setPos] = useState(0);
  useEffect(() => {
    animate({
      timing: fraction => move * fraction,
      draw: progress => setPos(progress),
      duration
    });
  }, []);

  return <div className="MovingDiv" style={{ left: pos }} />;
};

然后您还可以在计时功能中使用easyIn / easeOut开始演奏，以增加弹力。 。 https://codesandbox.io/s/2w6ww8oymp

You can also then start playing with easeIn/easeOut in the timing function to add a bit of spring.. https://codesandbox.io/s/2w6ww8oymp

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