tdesign-mobile-vue/lib/back-top/back-top.js

tdesign-mobile-vue

/**
 * tdesign v1.9.3
 * (c) 2025 TDesign Group
 * @license MIT
 */

import _defineProperty from '@babel/runtime/helpers/defineProperty';
import { defineComponent, ref, computed, onMounted, onUnmounted, withDirectives, createVNode, vShow } from 'vue';
import { useElementBounding } from '@vueuse/core';
import { BacktopIcon } from 'tdesign-icons-vue-next';
import props from './props.js';
import config from '../config.js';
import { useTNodeJSX } from '../hooks/tnode.js';
import { usePrefixClass } from '../hooks/useClass.js';
import getScrollParent from '../_util/getScrollParent.js';
import { isBrowser } from '../shared/util.js';
import 'lodash-es';
import '../hooks/render-tnode.js';
import '../_common/js/utils/general.js';
import '../config-provider/useConfig.js';
import '../config-provider/context.js';
import '../_common/js/global-config/mobile/default-config.js';
import '../_common/js/global-config/mobile/locale/zh_CN.js';
import '../_chunks/dep-f785f3d3.js';
import '@babel/runtime/helpers/typeof';
import '../_chunks/dep-0d44b254.js';
import 'dayjs';
import '@babel/runtime/helpers/slicedToArray';

var prefix = config.prefix;
var _BackTop = defineComponent({
  name: "".concat(prefix, "-back-top"),
  props: props,
  setup: function setup(props2) {
    var renderTNodeJSX = useTNodeJSX();
    var backTopClass = usePrefixClass("back-top");
    var root = ref();
    var target = computed(function () {
      if (!isBrowser) return void 0;
      return props2.target ? props2.target() : window.document.documentElement;
    });
    var container = ref();
    var _useElementBounding = useElementBounding(target),
      top = _useElementBounding.top;
    var visible = ref(false);
    var backTopClasses = computed(function () {
      return _defineProperty(_defineProperty(_defineProperty({}, "".concat(backTopClass.value), true), "".concat(backTopClass.value, "--fixed"), props2.fixed), "".concat(backTopClass.value, "--").concat(props2.theme), true);
    });
    var handleClick = function handleClick() {
      if (isBrowser) {
        var _props2$onToTop;
        container.value.scrollTop = 0 + top.value;
        (_props2$onToTop = props2.onToTop) === null || _props2$onToTop === void 0 || _props2$onToTop.call(props2);
      }
    };
    var getContainer = function getContainer(container2) {
      if (typeof container2 === "function") {
        return container2();
      }
      return getScrollParent(root.value, document.documentElement);
    };
    onMounted(function () {
      if (isBrowser) {
        container.value = getContainer(props2.container);
        container.value.onscroll = function () {
          var _container$value, _container$value2;
          if (((_container$value = container.value) === null || _container$value === void 0 ? void 0 : _container$value.scrollTop) >= props2.visibilityHeight) {
            visible.value = true;
          }
          if (visible.value && ((_container$value2 = container.value) === null || _container$value2 === void 0 ? void 0 : _container$value2.scrollTop) < props2.visibilityHeight) {
            visible.value = false;
          }
        };
      }
    });
    onUnmounted(function () {
      container.value.onscroll = null;
    });
    var readerIcon = function readerIcon() {
      if (props2.icon === true) {
        return createVNode(BacktopIcon, {
          "size": "22px"
        }, null);
      }
      return renderTNodeJSX("icon");
    };
    return function () {
      return withDirectives(createVNode("div", {
        "class": backTopClasses.value,
        "ref": root,
        "onClick": handleClick
      }, [readerIcon(), props2.text && createVNode("span", {
        "class": "".concat(backTopClass.value, "__text--").concat(props2.theme)
      }, [props2.text])]), [[vShow, visible.value]]);
    };
  }
});

export { _BackTop as default };
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