@shoelace-style/shoelace/dist/chunks/chunk.RISKC4J7.js

A forward-thinking library of web components.

// src/internal/scrollend-polyfill.ts
var debounce = (fn, delay) => {
  let timerId = 0;
  return function(...args) {
    window.clearTimeout(timerId);
    timerId = window.setTimeout(() => {
      fn.call(this, ...args);
    }, delay);
  };
};
var decorate = (proto, method, decorateFn) => {
  const superFn = proto[method];
  proto[method] = function(...args) {
    superFn.call(this, ...args);
    decorateFn.call(this, superFn, ...args);
  };
};
var isSupported = "onscrollend" in window;
if (!isSupported) {
  const pointers = /* @__PURE__ */ new Set();
  const scrollHandlers = /* @__PURE__ */ new WeakMap();
  const handlePointerDown = (event) => {
    for (const touch of event.changedTouches) {
      pointers.add(touch.identifier);
    }
  };
  const handlePointerUp = (event) => {
    for (const touch of event.changedTouches) {
      pointers.delete(touch.identifier);
    }
  };
  document.addEventListener("touchstart", handlePointerDown, true);
  document.addEventListener("touchend", handlePointerUp, true);
  document.addEventListener("touchcancel", handlePointerUp, true);
  decorate(EventTarget.prototype, "addEventListener", function(addEventListener, type) {
    if (type !== "scrollend")
      return;
    const handleScrollEnd = debounce(() => {
      if (!pointers.size) {
        this.dispatchEvent(new Event("scrollend"));
      } else {
        handleScrollEnd();
      }
    }, 100);
    addEventListener.call(this, "scroll", handleScrollEnd, { passive: true });
    scrollHandlers.set(this, handleScrollEnd);
  });
  decorate(EventTarget.prototype, "removeEventListener", function(removeEventListener, type) {
    if (type !== "scrollend")
      return;
    const scrollHandler = scrollHandlers.get(this);
    if (scrollHandler) {
      removeEventListener.call(this, "scroll", scrollHandler, { passive: true });
    }
  });
}