jtBaseApp/node_modules/vant/lib/composables/use-lock-scroll.js

var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var stdin_exports = {};
__export(stdin_exports, {
  useLockScroll: () => useLockScroll
});
module.exports = __toCommonJS(stdin_exports);
var import_vue = require("vue");
var import_use = require("@vant/use");
var import_use_touch = require("./use-touch");
var import_utils = require("../utils");
let totalLockCount = 0;
const BODY_LOCK_CLASS = "van-overflow-hidden";
function useLockScroll(rootRef, shouldLock) {
  const touch = (0, import_use_touch.useTouch)();
  const DIRECTION_UP = "01";
  const DIRECTION_DOWN = "10";
  const onTouchMove = (event) => {
    touch.move(event);
    const direction = touch.deltaY.value > 0 ? DIRECTION_DOWN : DIRECTION_UP;
    const el = (0, import_use.getScrollParent)(
      event.target,
      rootRef.value
    );
    const { scrollHeight, offsetHeight, scrollTop } = el;
    let status = "11";
    if (scrollTop === 0) {
      status = offsetHeight >= scrollHeight ? "00" : "01";
    } else if (scrollTop + offsetHeight >= scrollHeight) {
      status = "10";
    }
    if (status !== "11" && touch.isVertical() && !(parseInt(status, 2) & parseInt(direction, 2))) {
      (0, import_utils.preventDefault)(event, true);
    }
  };
  const lock = () => {
    document.addEventListener("touchstart", touch.start);
    document.addEventListener("touchmove", onTouchMove, { passive: false });
    if (!totalLockCount) {
      document.body.classList.add(BODY_LOCK_CLASS);
    }
    totalLockCount++;
  };
  const unlock = () => {
    if (totalLockCount) {
      document.removeEventListener("touchstart", touch.start);
      document.removeEventListener("touchmove", onTouchMove);
      totalLockCount--;
      if (!totalLockCount) {
        document.body.classList.remove(BODY_LOCK_CLASS);
      }
    }
  };
  const init = () => shouldLock() && lock();
  const destroy = () => shouldLock() && unlock();
  (0, import_use.onMountedOrActivated)(init);
  (0, import_vue.onDeactivated)(destroy);
  (0, import_vue.onBeforeUnmount)(destroy);
  (0, import_vue.watch)(shouldLock, (value) => {
    value ? lock() : unlock();
  });
}