公司小程序
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3 years ago
<template>
<view :id="elId" class="v-tabs">
<scroll-view
id="scrollContainer"
:scroll-x="scroll"
:scroll-left="scroll ? scrollLeft : 0"
:scroll-with-animation="scroll"
:style="{ position: fixed ? 'fixed' : 'relative', zIndex: 1993 }"
>
<view
class="v-tabs__container"
:style="{
display: scroll ? 'inline-flex' : 'flex',
whiteSpace: scroll ? 'nowrap' : 'normal',
background: bgColor,
height,
padding
}"
>
<view
class="v-tabs__container-item"
v-for="(v, i) in tabs"
:key="i"
:style="{
color: current == i ? activeColor : color,
fontSize: current == i ? fontSize : fontSize,
fontWeight: bold && current == i ? 'bold' : '',
justifyContent: !scroll ? 'center' : '',
flex: scroll ? '' : 1,
padding: paddingItem
}"
@click="change(i)"
>
{{ field ? v[field] : v }}
</view>
<view
v-if="!pills"
class="v-tabs__container-line"
:style="{
background: lineColor,
width: lineWidth + 'px',
height: lineHeight,
borderRadius: lineRadius,
left: lineLeft + 'px',
transform: `translateX(-${lineWidth / 2}px)`
}"
></view>
<view
v-else
class="v-tabs__container-pills"
:style="{
background: pillsColor,
borderRadius: pillsBorderRadius,
left: pillsLeft + 'px',
width: currentWidth + 'px',
height
}"
></view>
</view>
</scroll-view>
<view
class="v-tabs__placeholder"
:style="{
height: fixed ? height : '0',
padding
}"
></view>
</view>
</template>
<script>
/**
* v-tabs
* @property {Number} value 选中的下标
* @property {Array} tabs tabs 列表
* @property {String} bgColor = '#fff' 背景颜色
* @property {String} color = '#333' 默认颜色
* @property {String} activeColor = '#2979ff' 选中文字颜色
* @property {String} fontSize = '28rpx' 默认文字大小
* @property {String} activeFontSize = '28rpx' 选中文字大小
* @property {Boolean} bold = [true | false] 选中文字是否加粗
* @property {Boolean} scroll = [true | false] 是否滚动
* @property {String} height = '60rpx' tab 的高度
* @property {String} lineHeight = '10rpx' 下划线的高度
* @property {String} lineColor = '#2979ff' 下划线的颜色
* @property {Number} lineScale = 0.5 下划线的宽度缩放比例
* @property {String} lineRadius = '10rpx' 下划线圆角
* @property {Boolean} pills = [true | false] 是否胶囊样式
* @property {String} pillsColor = '#2979ff' 胶囊背景色
* @property {String} pillsBorderRadius = '10rpx' 胶囊圆角大小
* @property {String} field 如果是对象显示的键名
* @property {Boolean} fixed = [true | false] 是否固定
* @property {String} paddingItem = '0 22rpx' 选项的边距
*
* @event {Function(current)} change 改变标签触发
*/
export default {
props: {
value: {
type: Number,
default: 0
},
tabs: {
type: Array,
default() {
return []
}
},
bgColor: {
type: String,
default: '#fff'
},
padding: {
type: String,
default: '0'
},
color: {
type: String,
default: '#333'
},
activeColor: {
type: String,
default: '#2979ff'
},
fontSize: {
type: String,
default: '28rpx'
},
activeFontSize: {
type: String,
default: '32rpx'
},
bold: {
type: Boolean,
default: true
},
scroll: {
type: Boolean,
default: true
},
height: {
type: String,
default: '70rpx'
},
lineColor: {
type: String,
default: '#2979ff'
},
lineHeight: {
type: String,
default: '10rpx'
},
lineScale: {
type: Number,
default: 0.5
},
lineRadius: {
type: String,
default: '10rpx'
},
pills: {
type: Boolean,
deafult: false
},
pillsColor: {
type: String,
default: '#2979ff'
},
pillsBorderRadius: {
type: String,
default: '10rpx'
},
field: {
type: String,
default: ''
},
fixed: {
type: Boolean,
default: false
},
paddingItem: {
type: String,
default: '0 22rpx'
}
},
data() {
return {
elId: '',
lineWidth: 30,
currentWidth: 0, // 当前选项的宽度
lineLeft: 0, // 滑块距离左侧的位置
pillsLeft: 0, // 胶囊距离左侧的位置
scrollLeft: 0, // 距离左边的位置
containerWidth: 0, // 容器的宽度
current: 0 // 当前选中项
}
},
watch: {
value(newVal) {
this.current = newVal
this.$nextTick(() => {
this.getTabItemWidth()
})
},
current(newVal) {
this.$emit('input', newVal)
},
tabs(newVal) {
this.$nextTick(() => {
this.getTabItemWidth()
})
}
},
methods: {
// 产生随机字符串
randomString(len) {
len = len || 32
let $chars =
'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678' /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
let maxPos = $chars.length
let pwd = ''
for (let i = 0; i < len; i++) {
pwd += $chars.charAt(Math.floor(Math.random() * maxPos))
}
return pwd
},
// 切换事件
change(index) {
if (this.current !== index) {
this.current = index
this.$emit('change', index)
}
},
// 获取左移动位置
getTabItemWidth() {
let query = uni
.createSelectorQuery()
// #ifndef MP-ALIPAY
.in(this)
// #endif
// 获取容器的宽度
query
.select(`#scrollContainer`)
.boundingClientRect((data) => {
if (!this.containerWidth && data) {
this.containerWidth = data.width
}
})
.exec()
// 获取所有的 tab-item 的宽度
query
.selectAll('.v-tabs__container-item')
.boundingClientRect((data) => {
if (!data) {
return
}
let lineLeft = 0
let currentWidth = 0
if (data) {
for (let i = 0; i < data.length; i++) {
if (i < this.current) {
lineLeft += data[i].width
} else if (i == this.current) {
currentWidth = data[i].width
} else {
break
}
}
}
// 当前滑块的宽度
this.currentWidth = currentWidth
// 缩放后的滑块宽度
this.lineWidth = currentWidth * this.lineScale * 1
// 滑块作移动的位置
this.lineLeft = lineLeft + currentWidth / 2
// 胶囊距离左侧的位置
this.pillsLeft = lineLeft
// 计算滚动的距离左侧的位置
if (this.scroll) {
this.scrollLeft = this.lineLeft - this.containerWidth / 2
}
})
.exec()
}
},
mounted() {
this.elId = 'xfjpeter_' + this.randomString()
this.current = this.value
this.$nextTick(() => {
this.getTabItemWidth()
})
}
}
</script>
<style lang="scss" scoped>
.v-tabs {
width: 100%;
box-sizing: border-box;
overflow: hidden;
::-webkit-scrollbar {
display: none;
}
&__container {
min-width: 100%;
position: relative;
display: inline-flex;
align-items: center;
white-space: nowrap;
overflow: hidden;
&-item {
display: flex;
align-items: center;
height: 100%;
position: relative;
z-index: 10;
// padding: 0 11px;
transition: all 0.3s;
white-space: nowrap;
}
&-line {
position: absolute;
bottom: 0;
transition: all 0.3s linear;
}
&-pills {
position: absolute;
transition: all 0.3s linear;
z-index: 9;
}
}
}
</style>