215 lines
6.9 KiB
Vue
215 lines
6.9 KiB
Vue
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<template>
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<view
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class="u-switch"
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:class="[disabled && 'u-switch--disabled']"
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:style="[switchStyle, $u.addStyle(customStyle)]"
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@tap="clickHandler"
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>
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<view
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class="u-switch__bg"
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:style="[bgStyle]"
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>
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</view>
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<view
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class="u-switch__node"
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<!-- #ifdef VUE3 -->
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:class="[modelValue && 'u-switch__node--on']"
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<!-- #endif -->
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<!-- #ifdef VUE2 -->
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:class="[value && 'u-switch__node--on']"
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<!-- #endif -->
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:style="[nodeStyle]"
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ref="u-switch__node"
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>
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<u-loading-icon
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:show="loading"
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mode="circle"
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timingFunction='linear'
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<!-- #ifdef VUE3 -->
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:color="modelValue ? activeColor : '#AAABAD'"
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<!-- #endif -->
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<!-- #ifdef VUE2 -->
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:color="value ? activeColor : '#AAABAD'"
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<!-- #endif -->
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:size="size * 0.6"
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/>
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</view>
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</view>
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</template>
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<script>
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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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* switch 开关选择器
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* @description 选择开关一般用于只有两个选择，且只能选其一的场景。
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* @tutorial https://ijry.github.io/uview-plus/components/switch.html
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* @property {Boolean} loading 是否处于加载中（默认 false ）
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* @property {Boolean} disabled 是否禁用（默认 false ）
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* @property {String | Number} size 开关尺寸，单位px （默认 25 ）
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* @property {String} activeColor 打开时的背景色 （默认 '#2979ff' ）
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* @property {String} inactiveColor 关闭时的背景色 （默认 '#ffffff' ）
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* @property {Boolean | String | Number} value 通过v-model双向绑定的值 （默认 false ）
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* @property {Boolean | String | Number} activeValue 打开选择器时通过change事件发出的值 （默认 true ）
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* @property {Boolean | String | Number} inactiveValue 关闭选择器时通过change事件发出的值 （默认 false ）
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* @property {Boolean} asyncChange 是否开启异步变更，开启后需要手动控制输入值 （默认 false ）
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* @property {String | Number} space 圆点与外边框的距离 （默认 0 ）
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* @property {Object} customStyle 定义需要用到的外部样式
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*
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* @event {Function} change 在switch打开或关闭时触发
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* @example <u-switch v-model="checked" active-color="red" inactive-color="#eee"></u-switch>
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*/
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export default {
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name: "u-switch",
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mixins: [mpMixin, mixin,props],
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watch: {
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// #ifdef VUE3
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modelValue: {
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immediate: true,
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handler(n) {
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if(n !== this.inactiveValue && n !== this.activeValue) {
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uni.$u.error('v-model绑定的值必须为inactiveValue、activeValue二者之一')
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}
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}
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},
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// #endif
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// #ifdef VUE2
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value: {
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immediate: true,
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handler(n) {
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if(n !== this.inactiveValue && n !== this.activeValue) {
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uni.$u.error('v-model绑定的值必须为inactiveValue、activeValue二者之一')
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}
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}
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}
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// #endif
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},
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data() {
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return {
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bgColor: '#ffffff'
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}
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},
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computed: {
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isActive(){
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// #ifdef VUE3
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return this.modelValue === this.activeValue;
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// #endif
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// #ifdef VUE2
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return this.value === this.activeValue;
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// #endif
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},
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switchStyle() {
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let style = {}
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// 这里需要加2，是为了腾出边框的距离，否则圆点node会和外边框紧贴在一起
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style.width = uni.$u.addUnit(this.size * 2 + 2)
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style.height = uni.$u.addUnit(Number(this.size) + 2)
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// style.borderColor = this.value ? 'rgba(0, 0, 0, 0)' : 'rgba(0, 0, 0, 0.12)'
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// 如果自定义了“非激活”演示，name边框颜色设置为透明(跟非激活颜色一致)
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// 这里不能简单的设置为非激活的颜色，否则打开状态时，会有边框，所以需要透明
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if(this.customInactiveColor) {
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style.borderColor = 'rgba(0, 0, 0, 0)'
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}
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style.backgroundColor = this.isActive ? this.activeColor : this.inactiveColor
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return style;
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},
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nodeStyle() {
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let style = {}
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// 如果自定义非激活颜色，将node圆点的尺寸减少两个像素，让其与外边框距离更大一点
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style.width = uni.$u.addUnit(this.size - this.space)
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style.height = uni.$u.addUnit(this.size - this.space)
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const translateX = this.isActive ? uni.$u.addUnit(this.space) : uni.$u.addUnit(this.size);
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style.transform = `translateX(-${translateX})`
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return style
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},
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bgStyle() {
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let style = {}
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// 这里配置一个多余的元素在HTML中，是为了让switch切换时，有更良好的背景色扩充体验(见实际效果)
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style.width = uni.$u.addUnit(Number(this.size) * 2 - this.size / 2)
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style.height = uni.$u.addUnit(this.size)
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style.backgroundColor = this.inactiveColor
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// 打开时，让此元素收缩，否则反之
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style.transform = `scale(${this.isActive ? 0 : 1})`
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return style
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},
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customInactiveColor() {
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// 之所以需要判断是否自定义了“非激活”颜色，是为了让node圆点离外边框更宽一点的距离
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return this.inactiveColor !== '#fff' && this.inactiveColor !== '#ffffff'
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}
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},
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// #ifdef VUE3
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emits: ['update:modelValue', 'change'],
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// #endif
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methods: {
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clickHandler() {
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if (!this.disabled && !this.loading) {
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const oldValue = this.isActive ? this.inactiveValue : this.activeValue
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if(!this.asyncChange) {
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// #ifdef VUE3
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this.$emit("update:modelValue", oldValue);
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// #endif
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// #ifdef VUE2
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this.$emit("input", oldValue);
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// #endif
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}
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// 放到下一个生命周期，因为双向绑定的value修改父组件状态需要时间，且是异步的
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this.$nextTick(() => {
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this.$emit('change', oldValue)
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})
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}
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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-switch {
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@include flex(row);
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/* #ifndef APP-NVUE */
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box-sizing: border-box;
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/* #endif */
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position: relative;
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background-color: #fff;
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border-width: 1px;
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border-radius: 100px;
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transition: background-color 0.4s;
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border-color: rgba(0, 0, 0, 0.12);
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border-style: solid;
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justify-content: flex-end;
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align-items: center;
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// 由于weex为阿里逗着玩的KPI项目，导致bug奇多，这必须要写这一行，
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// 否则在iOS上，点击页面任意地方，都会触发switch的点击事件
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overflow: hidden;
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&__node {
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@include flex(row);
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align-items: center;
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justify-content: center;
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border-radius: 100px;
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background-color: #fff;
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border-radius: 100px;
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box-shadow: 1px 1px 1px 0 rgba(0, 0, 0, 0.25);
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transition-property: transform;
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transition-duration: 0.4s;
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transition-timing-function: cubic-bezier(0.3, 1.05, 0.4, 1.05);
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}
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&__bg {
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position: absolute;
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border-radius: 100px;
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background-color: #FFFFFF;
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transition-property: transform;
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transition-duration: 0.4s;
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border-top-left-radius: 0;
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border-bottom-left-radius: 0;
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transition-timing-function: ease;
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}
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&--disabled {
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opacity: 0.6;
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}
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}
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</style>
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