Question

试图找出如何使用React Spring设置多个弹簧的位卡住了，然后弹簧将按链序列进行动画处理。

这个想法是获取数组中每个路径的长度，这发生在useEffect中。提取长度后，我想使用它们来设置单独的弹簧，这些弹簧共同构成SVG箭头的动画。

Here's a hardcoded example可以按预期工作（在视口中单击任意位置，箭头将变为动画）

代码当前看起来像这样（Code Sandbox）：

const arrowData = {
  stroke: 'red',
  viewBox: '0 0 278 549',
  paths: [
    'M204.974 2.775c57.056 87.536 81.796 175.997 58.823 266.51C223.401 428.443-11.634 400.007 6.5 312.033 24.638 224.062 190 252 190 356c0 69.333-8 128.617-24 177.852', 
    'M223.324 500.772l-60.288 39.978-26.437-68.621',
  ]
};

const Arrow = () => {
  const [draw, setDraw] = useState(false);
  const [pathLengths, setPathLengths] = useState([]);

  // path refs
  const pathsRef = useRef(arrowData.paths.map(() => createRef()));

  // spring animation refs for chaining
  const springsRef = useRef(arrowData.paths.map(() => createRef()));


  useEffect(() => {
    const calculatedPathLengths = pathsRef.current.map(
      ref => ref.current.getTotalLength()
    );
    setPathLengths(calculatedPathLengths);

    // dynamically setup multiple springs for chained animation here, but how?
  }, [setPathLengths]);


  return (
    <div style={{pointerEvents: 'auto'}} onClick={() => setDraw(draw => !draw)}>
      <svg
        viewBox={arrowData.viewBox}
        stroke={arrowData.stroke}
        fill="none"
        strokeWidth="10"
      >
        {arrowData.paths.map((path, index) => (
          <animated.path 
            key={index}
            ref={pathsRef.current[index]}
            strokeDasharray={pathLengths[index]}
            strokeDashoffset="0" // <- value to be animated
            d={path}
          />
        ))}
      </svg>
    </div>
  )
}

如何动态设置多个Spring实例？

0 个答案: