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							354 lines
						
					
					
						
							11 KiB
						
					
					
				
								<template>
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									<view class="u-tabs">
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										<view class="u-tabs__wrapper">
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											<slot name="left" />
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											<view class="u-tabs__wrapper__scroll-view-wrapper">
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												<scroll-view
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													:scroll-x="scrollable"
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													:scroll-left="scrollLeft"
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													scroll-with-animation
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													class="u-tabs__wrapper__scroll-view"
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													:show-scrollbar="false"
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													ref="u-tabs__wrapper__scroll-view"
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												>
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													<view
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														class="u-tabs__wrapper__nav"
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														ref="u-tabs__wrapper__nav"
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													>
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														<view
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															class="u-tabs__wrapper__nav__item"
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															v-for="(item, index) in list"
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															:key="index"
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															@tap="clickHandler(item, index)"
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															:ref="`u-tabs__wrapper__nav__item-${index}`"
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															:style="[$u.addStyle(itemStyle), {flex: scrollable ? '' : 1}]"
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															:class="[`u-tabs__wrapper__nav__item-${index}`, item.disabled && 'u-tabs__wrapper__nav__item--disabled']"
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														>
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															<text
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																:class="[item.disabled && 'u-tabs__wrapper__nav__item__text--disabled']"
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																class="u-tabs__wrapper__nav__item__text"
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																:style="[textStyle(index)]"
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															>{{ item[keyName] }}</text>
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															<u-badge
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																:show="!!(item.badge && (item.badge.show || item.badge.isDot || item.badge.value))"
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																:isDot="item.badge && item.badge.isDot || propsBadge.isDot"
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																:value="item.badge && item.badge.value || propsBadge.value"
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																:max="item.badge && item.badge.max || propsBadge.max"
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																:type="item.badge && item.badge.type || propsBadge.type"
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																:showZero="item.badge && item.badge.showZero || propsBadge.showZero"
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																:bgColor="item.badge && item.badge.bgColor || propsBadge.bgColor"
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																:color="item.badge && item.badge.color || propsBadge.color"
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																:shape="item.badge && item.badge.shape || propsBadge.shape"
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																:numberType="item.badge && item.badge.numberType || propsBadge.numberType"
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																:inverted="item.badge && item.badge.inverted || propsBadge.inverted"
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																customStyle="margin-left: 4px;"
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															></u-badge>
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														</view>
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														<!-- #ifdef APP-NVUE -->
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														<view
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															class="u-tabs__wrapper__nav__line"
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															ref="u-tabs__wrapper__nav__line"
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															:style="[{
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																	width: $u.addUnit(lineWidth),
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																	height: $u.addUnit(lineHeight),
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																	background: lineColor,
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																	backgroundSize: lineBgSize,
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																}]"
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														>
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															<!-- #endif -->
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															<!-- #ifndef APP-NVUE -->
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															<view
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																class="u-tabs__wrapper__nav__line"
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																ref="u-tabs__wrapper__nav__line"
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																:style="[{
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																		width: $u.addUnit(lineWidth),
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																		transform: `translate(${lineOffsetLeft}px)`,
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																		transitionDuration: `${firstTime ? 0 : duration}ms`,
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																		height: $u.addUnit(lineHeight),
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																		background: lineColor,
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																		backgroundSize: lineBgSize,
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																	}]"
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															>
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																<!-- #endif -->
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															</view>
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														</view>
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												</scroll-view>
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											</view>
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											<slot name="right" />
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										</view>
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									</view>
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								</template>
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								<script>
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									// #ifdef APP-NVUE
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									const animation = uni.requireNativePlugin('animation')
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									const dom = uni.requireNativePlugin('dom')
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									// #endif
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									import props from './props.js';
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									/**
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									 * Tabs 标签
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									 * @description tabs标签组件,在标签多的时候,可以配置为左右滑动,标签少的时候,可以禁止滑动。 该组件的一个特点是配置为滚动模式时,激活的tab会自动移动到组件的中间位置。
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									 * @tutorial https://www.uviewui.com/components/tabs.html
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									 * @property {String | Number}	duration			滑块移动一次所需的时间,单位秒(默认 200 )
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									 * @property {String | Number}	swierWidth			swiper的宽度(默认 '750rpx' )
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									 * @property {String}	keyName	 从`list`元素对象中读取的键名(默认 'name' )
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									 * @event {Function(index)} change 标签改变时触发 index: 点击了第几个tab,索引从0开始
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									 * @event {Function(index)} click 点击标签时触发 index: 点击了第几个tab,索引从0开始
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									 * @example <u-tabs :list="list" :is-scroll="false" :current="current" @change="change"></u-tabs>
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									 */
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									export default {
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										name: 'u-tabs',
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										mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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										data() {
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											return {
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												firstTime: true,
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												scrollLeft: 0,
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												scrollViewWidth: 0,
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												lineOffsetLeft: 0,
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												tabsRect: {
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													left: 0
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												},
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												innerCurrent: 0,
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												moving: false,
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											}
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										},
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										watch: {
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											current: {
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												immediate: true,
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												handler (newValue, oldValue) {
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													// 内外部值不相等时,才尝试移动滑块
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													if (newValue !== this.innerCurrent) {
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														this.innerCurrent = newValue
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														this.$nextTick(() => {
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															this.resize()
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														})
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													}
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												}
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											},
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											// list变化时,重新渲染list各项信息
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											list() {
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												this.$nextTick(() => {
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													this.resize()
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												})
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											}
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										},
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										computed: {
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											textStyle() {
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												return index => {
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													const style = {}
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													// 取当期是否激活的样式
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													const customeStyle = index === this.innerCurrent ? uni.$u.addStyle(this.activeStyle) : uni.$u
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														.addStyle(
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															this.inactiveStyle)
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													// 如果当前菜单被禁用,则加上对应颜色,需要在此做处理,是因为nvue下,无法在style样式中通过!import覆盖标签的内联样式
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													if (this.list[index].disabled) {
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														style.color = '#c8c9cc'
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													}
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													return uni.$u.deepMerge(customeStyle, style)
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												}
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											},
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											propsBadge() {
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												return uni.$u.props.badge
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											}
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										},
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										async mounted() {
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											this.init()
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										},
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										methods: {
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											setLineLeft() {
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												const tabItem = this.list[this.innerCurrent];
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												if (!tabItem) {
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													return;
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												}
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												// 获取滑块该移动的位置
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												let lineOffsetLeft = this.list
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													.slice(0, this.innerCurrent)
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													.reduce((total, curr) => total + curr.rect.width, 0);
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								                // 获取下划线的数值px表示法
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												const lineWidth = uni.$u.getPx(this.lineWidth);
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												this.lineOffsetLeft = lineOffsetLeft + (tabItem.rect.width - lineWidth) / 2
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												// #ifdef APP-NVUE
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												// 第一次移动滑块,无需过渡时间
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												this.animation(this.lineOffsetLeft, this.firstTime ? 0 : parseInt(this.duration))
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												// #endif
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												// 如果是第一次执行此方法,让滑块在初始化时,瞬间滑动到第一个tab item的中间
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												// 这里需要一个定时器,因为在非nvue下,是直接通过style绑定过渡时间,需要等其过渡完成后,再设置为false(非第一次移动滑块)
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												if (this.firstTime) {
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													setTimeout(() => {
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														this.firstTime = false
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													}, 10);
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												}
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											},
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											// nvue下设置滑块的位置
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											animation(x, duration = 0) {
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												// #ifdef APP-NVUE
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												const ref = this.$refs['u-tabs__wrapper__nav__line']
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												animation.transition(ref, {
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													styles: {
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														transform: `translateX(${x}px)`
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													},
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													duration
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												})
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												// #endif
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											},
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											// 点击某一个标签
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											clickHandler(item, index) {
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												// 因为标签可能为disabled状态,所以click是一定会发出的,但是change事件是需要可用的状态才发出
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												this.$emit('click', {
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													...item,
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													index
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												})
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												// 如果disabled状态,返回
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												if (item.disabled) return
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												this.innerCurrent = index
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												this.resize()
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												this.$emit('change', {
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													...item,
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													index
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												})
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											},
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											init() {
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												uni.$u.sleep().then(() => {
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													this.resize()
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												})
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											},
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											setScrollLeft() {
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						|
												// 当前活动tab的布局信息,有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息
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												const tabRect = this.list[this.innerCurrent]
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												// 累加得到当前item到左边的距离
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												const offsetLeft = this.list
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													.slice(0, this.innerCurrent)
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													.reduce((total, curr) => {
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														return total + curr.rect.width
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						|
													}, 0)
							 | 
						|
												// 此处为屏幕宽度
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												const windowWidth = uni.$u.sys().windowWidth
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						|
												// 将活动的tabs-item移动到屏幕正中间,实际上是对scroll-view的移动
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						|
												let scrollLeft = offsetLeft - (this.tabsRect.width - tabRect.rect.width) / 2 - (windowWidth - this.tabsRect
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						|
													.right) / 2 + this.tabsRect.left / 2
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						|
												// 这里做一个限制,限制scrollLeft的最大值为整个scroll-view宽度减去tabs组件的宽度
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												scrollLeft = Math.min(scrollLeft, this.scrollViewWidth - this.tabsRect.width)
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												this.scrollLeft = Math.max(0, scrollLeft)
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											},
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						|
											// 获取所有标签的尺寸
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											resize() {
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												// 如果不存在list,则不处理
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												if(this.list.length === 0) {
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													return
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												}
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												Promise.all([this.getTabsRect(), this.getAllItemRect()]).then(([tabsRect, itemRect = []]) => {
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													this.tabsRect = tabsRect
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						|
													this.scrollViewWidth = 0
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													itemRect.map((item, index) => {
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														// 计算scroll-view的宽度,这里
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														this.scrollViewWidth += item.width
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						|
														// 另外计算每一个item的中心点X轴坐标
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														this.list[index].rect = item
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													})
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						|
													// 获取了tabs的尺寸之后,设置滑块的位置
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													this.setLineLeft()
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													this.setScrollLeft()
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												})
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						|
											},
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						|
											// 获取导航菜单的尺寸
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											getTabsRect() {
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												return new Promise(resolve => {
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													this.queryRect('u-tabs__wrapper__scroll-view').then(size => resolve(size))
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												})
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											},
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						|
											// 获取所有标签的尺寸
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											getAllItemRect() {
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												return new Promise(resolve => {
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													const promiseAllArr = this.list.map((item, index) => this.queryRect(
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														`u-tabs__wrapper__nav__item-${index}`, true))
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													Promise.all(promiseAllArr).then(sizes => resolve(sizes))
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						|
												})
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											},
							 | 
						|
											// 获取各个标签的尺寸
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											queryRect(el, item) {
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												// #ifndef APP-NVUE
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												// $uGetRect为uView自带的节点查询简化方法,详见文档介绍:https://www.uviewui.com/js/getRect.html
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						|
												// 组件内部一般用this.$uGetRect,对外的为uni.$u.getRect,二者功能一致,名称不同
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												return new Promise(resolve => {
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													this.$uGetRect(`.${el}`).then(size => {
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														resolve(size)
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						|
													})
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						|
												})
							 | 
						|
												// #endif
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						|
								
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												// #ifdef APP-NVUE
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												// nvue下,使用dom模块查询元素高度
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						|
												// 返回一个promise,让调用此方法的主体能使用then回调
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						|
												return new Promise(resolve => {
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													dom.getComponentRect(item ? this.$refs[el][0] : this.$refs[el], res => {
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														resolve(res.size)
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						|
													})
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						|
												})
							 | 
						|
												// #endif
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						|
											},
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						|
										},
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						|
									}
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						|
								</script>
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						|
								
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						|
								<style lang="scss" scoped>
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									@import "../../libs/css/components.scss";
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						|
								
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						|
									.u-tabs {
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						|
								
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										&__wrapper {
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											@include flex;
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											align-items: center;
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						|
								
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						|
											&__scroll-view-wrapper {
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						|
												flex: 1;
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						|
												/* #ifndef APP-NVUE */
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						|
												overflow: auto hidden;
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						|
												/* #endif */
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						|
											}
							 | 
						|
								
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						|
											&__scroll-view {
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						|
												@include flex;
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						|
												flex: 1;
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						|
											}
							 | 
						|
								
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						|
											&__nav {
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						|
												@include flex;
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						|
												position: relative;
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						|
								
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						|
												&__item {
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						|
													padding: 0 11px;
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						|
													@include flex;
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						|
													align-items: center;
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						|
													justify-content: center;
							 | 
						|
								
							 | 
						|
													&--disabled {
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						|
														/* #ifndef APP-NVUE */
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						|
														cursor: not-allowed;
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						|
														/* #endif */
							 | 
						|
													}
							 | 
						|
								
							 | 
						|
													&__text {
							 | 
						|
														font-size: 15px;
							 | 
						|
														color: $u-content-color;
							 | 
						|
								
							 | 
						|
														&--disabled {
							 | 
						|
															color: $u-disabled-color !important;
							 | 
						|
														}
							 | 
						|
													}
							 | 
						|
												}
							 | 
						|
								
							 | 
						|
												&__line {
							 | 
						|
													height: 3px;
							 | 
						|
													background: $u-primary;
							 | 
						|
													width: 30px;
							 | 
						|
													position: absolute;
							 | 
						|
													bottom: 2px;
							 | 
						|
													border-radius: 100px;
							 | 
						|
													transition-property: transform;
							 | 
						|
													transition-duration: 300ms;
							 | 
						|
												}
							 | 
						|
											}
							 | 
						|
										}
							 | 
						|
									}
							 | 
						|
								</style>
							 |