rafz/dist/raf.mjs

requestAnimationFrame for libraries

let updateQueue = makeQueue();
const raf = (fn) => schedule(fn, updateQueue);
let writeQueue = makeQueue();
raf.write = (fn) => schedule(fn, writeQueue);
let onStartQueue = makeQueue();
raf.onStart = (fn) => schedule(fn, onStartQueue);
let onFrameQueue = makeQueue();
raf.onFrame = (fn) => schedule(fn, onFrameQueue);
let onFinishQueue = makeQueue();
raf.onFinish = (fn) => schedule(fn, onFinishQueue);
let timeouts = [];
raf.setTimeout = (handler, ms) => {
  let time = raf.now() + ms;
  let cancel = () => {
    let i = timeouts.findIndex((t) => t.cancel == cancel);
    if (~i)
      timeouts.splice(i, 1);
    __raf.count -= ~i ? 1 : 0;
  };
  let timeout = {time, handler, cancel};
  timeouts.splice(findTimeout(time), 0, timeout);
  __raf.count += 1;
  start();
  return timeout;
};
let findTimeout = (time) => ~(~timeouts.findIndex((t) => t.time > time) || ~timeouts.length);
raf.cancel = (fn) => {
  updateQueue.delete(fn);
  writeQueue.delete(fn);
};
raf.sync = (fn) => {
  sync = true;
  raf.batchedUpdates(fn);
  sync = false;
};
raf.throttle = (fn) => {
  let lastArgs;
  function queuedFn() {
    try {
      fn(...lastArgs);
    } finally {
      lastArgs = null;
    }
  }
  function throttled(...args) {
    lastArgs = args;
    raf.onStart(queuedFn);
  }
  throttled.handler = fn;
  throttled.cancel = () => {
    onStartQueue.delete(queuedFn);
    lastArgs = null;
  };
  return throttled;
};
let nativeRaf = typeof window != "undefined" ? window.requestAnimationFrame : () => {
};
raf.use = (impl) => nativeRaf = impl;
raf.now = typeof performance != "undefined" ? () => performance.now() : Date.now;
raf.batchedUpdates = (fn) => fn();
raf.catch = console.error;
let ts = -1;
let sync = false;
function schedule(fn, queue) {
  if (sync) {
    queue.delete(fn);
    fn(0);
  } else {
    queue.add(fn);
    start();
  }
}
function start() {
  if (ts < 0) {
    ts = 0;
    nativeRaf(loop);
  }
}
function loop() {
  if (~ts) {
    nativeRaf(loop);
    raf.batchedUpdates(update);
  }
}
function update() {
  let prevTs = ts;
  ts = raf.now();
  let count = findTimeout(ts);
  if (count) {
    eachSafely(timeouts.splice(0, count), (t) => t.handler());
    __raf.count -= count;
  }
  onStartQueue.flush();
  updateQueue.flush(prevTs ? Math.min(64, ts - prevTs) : 16.667);
  onFrameQueue.flush();
  writeQueue.flush();
  onFinishQueue.flush();
}
function makeQueue() {
  let next = new Set();
  let current = next;
  return {
    add(fn) {
      __raf.count += current == next && !next.has(fn) ? 1 : 0;
      next.add(fn);
    },
    delete(fn) {
      __raf.count -= current == next && next.has(fn) ? 1 : 0;
      return next.delete(fn);
    },
    flush(arg) {
      if (current.size) {
        next = new Set();
        __raf.count -= current.size;
        eachSafely(current, (fn) => fn(arg) && next.add(fn));
        __raf.count += next.size;
        current = next;
      }
    }
  };
}
function eachSafely(values, each) {
  values.forEach((value) => {
    try {
      each(value);
    } catch (e) {
      raf.catch(e);
    }
  });
}
const __raf = {
  count: 0,
  clear() {
    ts = -1;
    timeouts = [];
    onStartQueue = makeQueue();
    updateQueue = makeQueue();
    onFrameQueue = makeQueue();
    writeQueue = makeQueue();
    onFinishQueue = makeQueue();
    __raf.count = 0;
  }
};

export { __raf, raf };
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