rc-util/es/raf.js

var raf = function raf(callback) {
  return +setTimeout(callback, 16);
};
var caf = function caf(num) {
  return clearTimeout(num);
};
if (typeof window !== 'undefined' && 'requestAnimationFrame' in window) {
  raf = function raf(callback) {
    return window.requestAnimationFrame(callback);
  };
  caf = function caf(handle) {
    return window.cancelAnimationFrame(handle);
  };
}
var rafUUID = 0;
var rafIds = new Map();
function cleanup(id) {
  rafIds.delete(id);
}
var wrapperRaf = function wrapperRaf(callback) {
  var times = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
  rafUUID += 1;
  var id = rafUUID;
  function callRef(leftTimes) {
    if (leftTimes === 0) {
      // Clean up
      cleanup(id);

      // Trigger
      callback();
    } else {
      // Next raf
      var realId = raf(function () {
        callRef(leftTimes - 1);
      });

      // Bind real raf id
      rafIds.set(id, realId);
    }
  }
  callRef(times);
  return id;
};
wrapperRaf.cancel = function (id) {
  var realId = rafIds.get(id);
  cleanup(id);
  return caf(realId);
};
if (process.env.NODE_ENV !== 'production') {
  wrapperRaf.ids = function () {
    return rafIds;
  };
}
export default wrapperRaf;