gree_leran/node_modules/uview-plus/components/u-tabs/u-tabs.vue

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2024-06-14 01:11:29 +00:00
<template>
<view class="u-tabs">
<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 `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;
&--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>