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<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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</view>
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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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</view>
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<!-- #endif -->
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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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import mpMixin from '../../libs/mixin/mpMixin.js';
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import mixin from '../../libs/mixin/mixin.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://ijry.github.io/uview-plus/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: [mpMixin, 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.$u.props.badge
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}
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},
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async mounted() {
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this.init()
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},
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emits: ['click', 'change'],
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methods: {
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setLineLeft() {
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const tabItem = this.list[this.innerCurrent];
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if (!tabItem) {
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return;
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}
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// 获取滑块该移动的位置
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let lineOffsetLeft = this.list
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.slice(0, this.innerCurrent)
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.reduce((total, curr) => total + curr.rect.width, 0);
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// 获取下划线的数值px表示法
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const lineWidth = uni.$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.$u.sleep().then(() => {
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this.resize()
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})
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},
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setScrollLeft() {
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// 当前活动tab的布局信息，有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息
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const tabRect = this.list[this.innerCurrent]
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// 累加得到当前item到左边的距离
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const offsetLeft = this.list
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.slice(0, this.innerCurrent)
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.reduce((total, curr) => {
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return total + curr.rect.width
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}, 0)
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// 此处为屏幕宽度
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const windowWidth = uni.$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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},
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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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// $uGetRect为uView自带的节点查询简化方法，详见文档介绍：https://ijry.github.io/uview-plus/js/getRect.html
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// 组件内部一般用this.$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(`.${el}`).then(size => {
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resolve(size)
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})
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})
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// #endif
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// #ifdef APP-NVUE
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// nvue下，使用dom模块查询元素高度
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// 返回一个promise，让调用此方法的主体能使用then回调
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return new Promise(resolve => {
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dom.getComponentRect(item ? this.$refs[el][0] : this.$refs[el], res => {
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resolve(res.size)
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})
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})
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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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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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.u-tabs {
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&__wrapper {
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@include flex;
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align-items: center;
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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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&__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;
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&--disabled {
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/* #ifndef APP-NVUE */
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cursor: not-allowed;
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/* #endif */
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}
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&__text {
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font-size: 15px;
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color: $u-content-color;
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&--disabled {
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color: $u-disabled-color !important;
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}
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}
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}
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&__line {
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height: 3px;
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background: $u-primary;
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width: 30px;
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position: absolute;
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bottom: 2px;
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border-radius: 100px;
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transition-property: transform;
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transition-duration: 300ms;
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}
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}
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}
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}
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</style>
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