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node_modules/vant/es/back-top/BackTop.mjs

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+import { ref, watch, computed, Teleport, nextTick, onMounted, defineComponent, onDeactivated, onActivated, createVNode as _createVNode, mergeProps as _mergeProps } from "vue";
+import { extend, addUnit, inBrowser, numericProp, getScrollTop, getZIndexStyle, createNamespace, makeNumericProp } from "../utils/index.mjs";
+import { throttle } from "../lazyload/vue-lazyload/util.mjs";
+import { useEventListener, getScrollParent } from "@vant/use";
+import { Icon } from "../icon/index.mjs";
+const [name, bem] = createNamespace("back-top");
+const backTopProps = {
+  right: numericProp,
+  bottom: numericProp,
+  zIndex: numericProp,
+  target: [String, Object],
+  offset: makeNumericProp(200),
+  immediate: Boolean,
+  teleport: {
+    type: [String, Object],
+    default: "body"
+  }
+};
+var stdin_default = defineComponent({
+  name,
+  inheritAttrs: false,
+  props: backTopProps,
+  emits: ["click"],
+  setup(props, {
+    emit,
+    slots,
+    attrs
+  }) {
+    let shouldReshow = false;
+    const show = ref(false);
+    const root = ref();
+    const scrollParent = ref();
+    const style = computed(() => extend(getZIndexStyle(props.zIndex), {
+      right: addUnit(props.right),
+      bottom: addUnit(props.bottom)
+    }));
+    const onClick = (event) => {
+      var _a;
+      emit("click", event);
+      (_a = scrollParent.value) == null ? void 0 : _a.scrollTo({
+        top: 0,
+        behavior: props.immediate ? "auto" : "smooth"
+      });
+    };
+    const scroll = () => {
+      show.value = scrollParent.value ? getScrollTop(scrollParent.value) >= +props.offset : false;
+    };
+    const getTarget = () => {
+      const {
+        target
+      } = props;
+      if (typeof target === "string") {
+        const el = document.querySelector(target);
+        if (el) {
+          return el;
+        }
+        if (process.env.NODE_ENV !== "production") {
+          console.error(`[Vant] BackTop: target element "${target}" was not found, the BackTop component will not be rendered.`);
+        }
+      } else {
+        return target;
+      }
+    };
+    const updateTarget = () => {
+      if (inBrowser) {
+        nextTick(() => {
+          scrollParent.value = props.target ? getTarget() : getScrollParent(root.value);
+          scroll();
+        });
+      }
+    };
+    useEventListener("scroll", throttle(scroll, 100), {
+      target: scrollParent
+    });
+    onMounted(updateTarget);
+    onActivated(() => {
+      if (shouldReshow) {
+        show.value = true;
+        shouldReshow = false;
+      }
+    });
+    onDeactivated(() => {
+      if (show.value && props.teleport) {
+        show.value = false;
+        shouldReshow = true;
+      }
+    });
+    watch(() => props.target, updateTarget);
+    return () => {
+      const Content = _createVNode("div", _mergeProps({
+        "ref": !props.teleport ? root : void 0,
+        "class": bem({
+          active: show.value
+        }),
+        "style": style.value,
+        "onClick": onClick
+      }, attrs), [slots.default ? slots.default() : _createVNode(Icon, {
+        "name": "back-top",
+        "class": bem("icon")
+      }, null)]);
+      if (props.teleport) {
+        return [_createVNode("div", {
+          "ref": root,
+          "class": bem("placeholder")
+        }, null), _createVNode(Teleport, {
+          "to": props.teleport
+        }, {
+          default: () => [Content]
+        })];
+      }
+      return Content;
+    };
+  }
+});
+export {
+  backTopProps,
+  stdin_default as default
+};