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node_modules/vant/es/composables/use-lock-scroll.mjs

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+import { watch, onBeforeUnmount, onDeactivated } from "vue";
+import { getScrollParent, onMountedOrActivated } from "@vant/use";
+import { useTouch } from "./use-touch.mjs";
+import { preventDefault } from "../utils/index.mjs";
+let totalLockCount = 0;
+const BODY_LOCK_CLASS = "van-overflow-hidden";
+function useLockScroll(rootRef, shouldLock) {
+  const 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 = 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))) {
+      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();
+  onMountedOrActivated(init);
+  onDeactivated(destroy);
+  onBeforeUnmount(destroy);
+  watch(shouldLock, (value) => {
+    value ? lock() : unlock();
+  });
+}
+export {
+  useLockScroll
+};