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admin-system/node_modules/element-plus/lib/components/backtop/src/use-backtop.js

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+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var vue = require('vue');
+var core = require('@vueuse/core');
+var error = require('../../../utils/error.js');
+
+const useBackTop = (props, emit, componentName) => {
+  const el = vue.shallowRef();
+  const container = vue.shallowRef();
+  const visible = vue.ref(false);
+  const handleScroll = () => {
+    if (el.value)
+      visible.value = el.value.scrollTop >= props.visibilityHeight;
+  };
+  const handleClick = (event) => {
+    var _a;
+    (_a = el.value) == null ? void 0 : _a.scrollTo({ top: 0, behavior: "smooth" });
+    emit("click", event);
+  };
+  const handleScrollThrottled = core.useThrottleFn(handleScroll, 300, true);
+  core.useEventListener(container, "scroll", handleScrollThrottled);
+  vue.onMounted(() => {
+    var _a;
+    container.value = document;
+    el.value = document.documentElement;
+    if (props.target) {
+      el.value = (_a = document.querySelector(props.target)) != null ? _a : void 0;
+      if (!el.value) {
+        error.throwError(componentName, `target does not exist: ${props.target}`);
+      }
+      container.value = el.value;
+    }
+    handleScroll();
+  });
+  return {
+    visible,
+    handleClick
+  };
+};
+
+exports.useBackTop = useBackTop;
+//# sourceMappingURL=use-backtop.js.map