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node_modules/vant/es/tabs/utils.mjs

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+import { raf, cancelRaf } from "@vant/use";
+import { getScrollTop, setScrollTop } from "../utils/index.mjs";
+function scrollLeftTo(scroller, to, duration) {
+  let rafId;
+  let count = 0;
+  const from = scroller.scrollLeft;
+  const frames = duration === 0 ? 1 : Math.round(duration * 1e3 / 16);
+  let scrollLeft = from;
+  function cancel() {
+    cancelRaf(rafId);
+  }
+  function animate() {
+    scrollLeft += (to - from) / frames;
+    scroller.scrollLeft = scrollLeft;
+    if (++count < frames) {
+      rafId = raf(animate);
+    }
+  }
+  animate();
+  return cancel;
+}
+function scrollTopTo(scroller, to, duration, callback) {
+  let rafId;
+  let current = getScrollTop(scroller);
+  const isDown = current < to;
+  const frames = duration === 0 ? 1 : Math.round(duration * 1e3 / 16);
+  const step = (to - current) / frames;
+  function cancel() {
+    cancelRaf(rafId);
+  }
+  function animate() {
+    current += step;
+    if (isDown && current > to || !isDown && current < to) {
+      current = to;
+    }
+    setScrollTop(scroller, current);
+    if (isDown && current < to || !isDown && current > to) {
+      rafId = raf(animate);
+    } else if (callback) {
+      rafId = raf(callback);
+    }
+  }
+  animate();
+  return cancel;
+}
+export {
+  scrollLeftTo,
+  scrollTopTo
+};