You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

362 lines
11 KiB

<template>
<view class="u-tabs" :class="[customClass]">
<view class="u-tabs__wrapper">
<slot name="left" />
<view class="u-tabs__wrapper__scroll-view-wrapper">
<scroll-view
:scroll-x="scrollable"
:scroll-left="scrollLeft"
scroll-with-animation
class="u-tabs__wrapper__scroll-view"
:show-scrollbar="false"
ref="u-tabs__wrapper__scroll-view"
>
<view
class="u-tabs__wrapper__nav"
ref="u-tabs__wrapper__nav"
>
<view
class="u-tabs__wrapper__nav__item"
v-for="(item, index) in list"
:key="index"
@tap="clickHandler(item, index)"
:ref="`u-tabs__wrapper__nav__item-${index}`"
:style="[addStyle(itemStyle), {flex: scrollable ? '' : 1}]"
:class="[`u-tabs__wrapper__nav__item-${index}`, item.disabled && 'u-tabs__wrapper__nav__item--disabled']"
>
<text
:class="[item.disabled && 'u-tabs__wrapper__nav__item__text--disabled']"
class="u-tabs__wrapper__nav__item__text"
:style="[textStyle(index)]"
>{{ item[keyName] }}</text>
<u-badge
:show="!!(item.badge && (item.badge.show || item.badge.isDot || item.badge.value))"
:isDot="item.badge && item.badge.isDot || propsBadge.isDot"
:value="item.badge && item.badge.value || propsBadge.value"
:max="item.badge && item.badge.max || propsBadge.max"
:type="item.badge && item.badge.type || propsBadge.type"
:showZero="item.badge && item.badge.showZero || propsBadge.showZero"
:bgColor="item.badge && item.badge.bgColor || propsBadge.bgColor"
:color="item.badge && item.badge.color || propsBadge.color"
:shape="item.badge && item.badge.shape || propsBadge.shape"
:numberType="item.badge && item.badge.numberType || propsBadge.numberType"
:inverted="item.badge && item.badge.inverted || propsBadge.inverted"
customStyle="margin-left: 4px;"
></u-badge>
</view>
<!-- #ifdef APP-NVUE -->
<view
class="u-tabs__wrapper__nav__line"
ref="u-tabs__wrapper__nav__line"
:style="[{
width: addUnit(lineWidth),
height: addUnit(lineHeight),
background: lineColor,
backgroundSize: lineBgSize,
}]"
>
</view>
<!-- #endif -->
<!-- #ifndef APP-NVUE -->
<view
class="u-tabs__wrapper__nav__line"
ref="u-tabs__wrapper__nav__line"
:style="[{
width: addUnit(lineWidth),
transform: `translate(${lineOffsetLeft}px)`,
transitionDuration: `${firstTime ? 0 : duration}ms`,
height: addUnit(lineHeight),
background: lineColor,
backgroundSize: lineBgSize,
}]"
>
</view>
<!-- #endif -->
</view>
</scroll-view>
</view>
<slot name="right" />
</view>
</view>
</template>
<script>
// #ifdef APP-NVUE
const animation = uni.requireNativePlugin('animation')
const dom = uni.requireNativePlugin('dom')
// #endif
import { props } from './props';
import { mpMixin } from '../../libs/mixin/mpMixin';
import { mixin } from '../../libs/mixin/mixin';
import defProps from '../../libs/config/props.js'
import { addUnit, addStyle, deepMerge, getPx, sleep, sys } from '../../libs/function/index';
/**
* Tabs 标签
* @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。
* @tutorial https://ijry.github.io/uview-plus/components/tabs.html
* @property {String | Number} duration 滑块移动一次所需的时间,单位秒(默认 200 )
* @property {String | Number} swierWidth swiper的宽度(默认 '750rpx' )
* @property {String} keyName 从`list`元素对象中读取的键名(默认 'name' )
* @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
* @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
* @example <u-tabs :list="list" :is-scroll="false" :current="current" @change="change"></u-tabs>
*/
export default {
name: 'u-tabs',
mixins: [mpMixin, mixin, props],
data() {
return {
firstTime: true,
scrollLeft: 0,
scrollViewWidth: 0,
lineOffsetLeft: 0,
tabsRect: {
left: 0
},
innerCurrent: 0,
moving: false,
}
},
watch: {
current: {
immediate: true,
handler (newValue, oldValue) {
// 内外部值不相等时,才尝试移动滑块
if (newValue !== this.innerCurrent) {
this.innerCurrent = newValue
this.$nextTick(() => {
this.resize()
})
}
}
},
// list变化时,重新渲染list各项信息
list() {
this.$nextTick(() => {
this.resize()
})
}
},
computed: {
textStyle() {
return index => {
const style = {}
// 取当期是否激活的样式
const customeStyle = index === this.innerCurrent ? addStyle(this.activeStyle) : addStyle(this.inactiveStyle)
// 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
if (this.list[index].disabled) {
style.color = '#c8c9cc'
}
return deepMerge(customeStyle, style)
}
},
propsBadge() {
return defProps.badge
}
},
async mounted() {
this.init()
},
emits: ['click', 'change'],
methods: {
addStyle,
addUnit,
setLineLeft() {
const tabItem = this.list[this.innerCurrent];
if (!tabItem) {
return;
}
// 获取滑块该移动的位置
let lineOffsetLeft = this.list
.slice(0, this.innerCurrent)
.reduce((total, curr) => total + curr.rect.width, 0);
// 获取下划线的数值px表示法
const lineWidth = getPx(this.lineWidth);
this.lineOffsetLeft = lineOffsetLeft + (tabItem.rect.width - lineWidth) / 2
// #ifdef APP-NVUE
// 第一次移动滑块,无需过渡时间
this.animation(this.lineOffsetLeft, this.firstTime ? 0 : parseInt(this.duration))
// #endif
// 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
// 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)
if (this.firstTime) {
setTimeout(() => {
this.firstTime = false
}, 10);
}
},
// nvue下设置滑块的位置
animation(x, duration = 0) {
// #ifdef APP-NVUE
const ref = this.$refs['u-tabs__wrapper__nav__line']
animation.transition(ref, {
styles: {
transform: `translateX(${x}px)`
},
duration
})
// #endif
},
// 点击某一个标签
clickHandler(item, index) {
// 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
this.$emit('click', {
...item,
index
}, index)
// 如果disabled状态,返回
if (item.disabled) return
this.innerCurrent = index
this.resize()
this.$emit('change', {
...item,
index
}, index)
},
init() {
sleep().then(() => {
this.resize()
})
},
setScrollLeft() {
// 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
const tabRect = this.list[this.innerCurrent]
// 累加得到当前item到左边的距离
const offsetLeft = this.list
.slice(0, this.innerCurrent)
.reduce((total, curr) => {
return total + curr.rect.width
}, 0)
// 此处为屏幕宽度
const windowWidth = sys().windowWidth
// 将活动的tabs-item移动到屏幕正中间,实际上是对scroll-view的移动
let scrollLeft = offsetLeft - (this.tabsRect.width - tabRect.rect.width) / 2 - (windowWidth - this.tabsRect
.right) / 2 + this.tabsRect.left / 2
// 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
scrollLeft = Math.min(scrollLeft, this.scrollViewWidth - this.tabsRect.width)
this.scrollLeft = Math.max(0, scrollLeft)
},
// 获取所有标签的尺寸
resize() {
// 如果不存在list,则不处理
if(this.list.length === 0) {
return
}
Promise.all([this.getTabsRect(), this.getAllItemRect()]).then(([tabsRect, itemRect = []]) => {
this.tabsRect = tabsRect
this.scrollViewWidth = 0
itemRect.map((item, index) => {
// 计算scroll-view的宽度,这里
this.scrollViewWidth += item.width
// 另外计算每一个item的中心点X轴坐标
this.list[index].rect = item
})
// 获取了tabs的尺寸之后,设置滑块的位置
this.setLineLeft()
this.setScrollLeft()
})
},
// 获取导航菜单的尺寸
getTabsRect() {
return new Promise(resolve => {
this.queryRect('u-tabs__wrapper__scroll-view').then(size => resolve(size))
})
},
// 获取所有标签的尺寸
getAllItemRect() {
return new Promise(resolve => {
const promiseAllArr = this.list.map((item, index) => this.queryRect(
`u-tabs__wrapper__nav__item-${index}`, true))
Promise.all(promiseAllArr).then(sizes => resolve(sizes))
})
},
// 获取各个标签的尺寸
queryRect(el, item) {
// #ifndef APP-NVUE
// $uGetRect为uView自带的节点查询简化方法,详见文档介绍:https://ijry.github.io/uview-plus/js/getRect.html
// 组件内部一般用this.$uGetRect,对外的为uni.$u.getRect,二者功能一致,名称不同
return new Promise(resolve => {
this.$uGetRect(`.${el}`).then(size => {
resolve(size)
})
})
// #endif
// #ifdef APP-NVUE
// nvue下,使用dom模块查询元素高度
// 返回一个promise,让调用此方法的主体能使用then回调
return new Promise(resolve => {
dom.getComponentRect(item ? this.$refs[el][0] : this.$refs[el], res => {
resolve(res.size)
})
})
// #endif
},
},
}
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
.u-tabs {
&__wrapper {
@include flex;
align-items: center;
&__scroll-view-wrapper {
flex: 1;
/* #ifndef APP-NVUE */
overflow: auto hidden;
/* #endif */
}
&__scroll-view {
@include flex;
flex: 1;
}
&__nav {
@include flex;
position: relative;
&__item {
padding: 0 11px;
@include flex;
align-items: center;
justify-content: center;
cursor: pointer;
&--disabled {
/* #ifndef APP-NVUE */
cursor: not-allowed;
/* #endif */
}
&__text {
font-size: 15px;
color: $u-content-color;
white-space: nowrap !important;
&--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>