{"version":3,"file":"tab-bar2.mjs","names":[],"sources":["../../../../../../packages/components/tabs/src/tab-bar.vue"],"sourcesContent":["<template>\n  <div\n    v-if=\"renderActiveBar\"\n    ref=\"barRef\"\n    :class=\"[ns.e('active-bar'), ns.is(rootTabs!.props.tabPosition)]\"\n    :style=\"barStyle\"\n  />\n</template>\n\n<script lang=\"ts\" setup>\nimport { computed, inject, nextTick, onBeforeUnmount, ref, watch } from 'vue'\nimport { useResizeObserver } from '@vueuse/core'\nimport { capitalize, isUndefined, throwError } from '@element-plus/utils'\nimport { useNamespace } from '@element-plus/hooks'\nimport { tabsRootContextKey } from './constants'\n\nimport type { TabBarProps } from './tab-bar'\nimport type { CSSProperties } from 'vue'\n\nconst COMPONENT_NAME = 'ElTabBar'\ndefineOptions({\n  name: COMPONENT_NAME,\n})\nconst props = withDefaults(defineProps<TabBarProps>(), {\n  tabs: () => [],\n  tabRefs: () => ({}),\n})\n\nconst rootTabs = inject(tabsRootContextKey)\nif (!rootTabs) throwError(COMPONENT_NAME, '<el-tabs><el-tab-bar /></el-tabs>')\n\nconst ns = useNamespace('tabs')\n\nconst barRef = ref<HTMLDivElement>()\nconst barStyle = ref<CSSProperties>()\n/**\n * when defaultValue is not set, the bar is always shown.\n *\n * when defaultValue is set, the bar will be hidden until style is calculated\n * to avoid the bar showing in the wrong position on initial render.\n */\nconst renderActiveBar = computed(\n  () =>\n    isUndefined(rootTabs.props.defaultValue) ||\n    Boolean(barStyle.value?.transform)\n)\n\nconst getBarStyle = (): CSSProperties => {\n  let offset = 0\n  let tabSize = 0\n\n  const sizeName = ['top', 'bottom'].includes(rootTabs.props.tabPosition)\n    ? 'width'\n    : 'height'\n  const sizeDir = sizeName === 'width' ? 'x' : 'y'\n  const position = sizeDir === 'x' ? 'left' : 'top'\n\n  props.tabs.every((tab) => {\n    if (isUndefined(tab.paneName)) return false\n    const $el = props.tabRefs[tab.paneName]\n    if (!$el) return false\n\n    if (!tab.active) {\n      return true\n    }\n\n    offset = $el[`offset${capitalize(position)}`]\n    tabSize = $el[`client${capitalize(sizeName)}`]\n\n    const tabStyles = window.getComputedStyle($el)\n\n    if (sizeName === 'width') {\n      tabSize -=\n        Number.parseFloat(tabStyles.paddingLeft) +\n        Number.parseFloat(tabStyles.paddingRight)\n      offset += Number.parseFloat(tabStyles.paddingLeft)\n    }\n    return false\n  })\n\n  return {\n    [sizeName]: `${tabSize}px`,\n    transform: `translate${capitalize(sizeDir)}(${offset}px)`,\n  }\n}\n\nconst update = () => (barStyle.value = getBarStyle())\n\nconst tabObservers = [] as ReturnType<typeof useResizeObserver>[]\nconst observerTabs = () => {\n  tabObservers.forEach((observer) => observer.stop())\n  tabObservers.length = 0\n\n  Object.values(props.tabRefs).forEach((tab) => {\n    tabObservers.push(useResizeObserver(tab, update))\n  })\n}\n\nwatch(\n  () => props.tabs,\n  async () => {\n    await nextTick()\n    update()\n\n    observerTabs()\n  },\n  { immediate: true }\n)\nconst barObserver = useResizeObserver(barRef, () => update())\n\nonBeforeUnmount(() => {\n  tabObservers.forEach((observer) => observer.stop())\n  tabObservers.length = 0\n  barObserver.stop()\n})\n\ndefineExpose({\n  /** @description tab root html element */\n  ref: barRef,\n  /** @description method to manually update tab bar style, return the updated style */\n  update,\n})\n</script>\n"],"mappings":""}