<template>
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<div class="el-tabs__active-bar" :class="`is-${ rootTabs.tabPosition }`" :style="barStyle"></div>
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</template>
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<script>
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import { arrayFind } from 'element-ui/src/utils/util';
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export default {
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name: 'TabBar',
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props: {
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tabs: Array
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},
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inject: ['rootTabs'],
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computed: {
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barStyle: {
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get() {
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let style = {};
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let offset = 0;
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let tabSize = 0;
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const sizeName = ['top', 'bottom'].indexOf(this.rootTabs.tabPosition) !== -1 ? 'width' : 'height';
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const sizeDir = sizeName === 'width' ? 'x' : 'y';
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const firstUpperCase = str => {
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return str.toLowerCase().replace(/( |^)[a-z]/g, (L) => L.toUpperCase());
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};
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this.tabs.every((tab, index) => {
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let $el = arrayFind(this.$parent.$refs.tabs || [], t => t.id.replace('tab-', '') === tab.paneName);
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if (!$el) { return false; }
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if (!tab.active) {
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offset += $el[`client${firstUpperCase(sizeName)}`];
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return true;
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} else {
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tabSize = $el[`client${firstUpperCase(sizeName)}`];
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const tabStyles = window.getComputedStyle($el);
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if (sizeName === 'width' && this.tabs.length > 1) {
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tabSize -= parseFloat(tabStyles.paddingLeft) + parseFloat(tabStyles.paddingRight);
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}
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if (sizeName === 'width') {
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offset += parseFloat(tabStyles.paddingLeft);
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}
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return false;
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}
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});
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const transform = `translate${firstUpperCase(sizeDir)}(${offset}px)`;
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style[sizeName] = tabSize + 'px';
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style.transform = transform;
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style.msTransform = transform;
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style.webkitTransform = transform;
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return style;
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}
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}
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}
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};
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</script>
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