<template>
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<view
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class="u-checkbox"
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:style="[checkboxStyle]"
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@tap.stop="wrapperClickHandler"
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:class="[`u-checkbox-label--${parentData.iconPlacement}`, parentData.borderBottom && parentData.placement === 'column' && 'u-border-bottom']"
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>
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<view
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class="u-checkbox__icon-wrap"
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@tap.stop="iconClickHandler"
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:class="iconClasses"
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:style="[iconWrapStyle]"
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>
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<slot name="icon">
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<u-icon
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class="u-checkbox__icon-wrap__icon"
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name="checkbox-mark"
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:size="elIconSize"
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:color="elIconColor"
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/>
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</slot>
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</view>
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<text
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@tap.stop="labelClickHandler"
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:style="{
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color: elDisabled ? elInactiveColor : elLabelColor,
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fontSize: elLabelSize,
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lineHeight: elLabelSize
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}"
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>{{label}}</text>
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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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/**
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* checkbox 复选框
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* @description 复选框组件一般用于需要多个选择的场景，该组件功能完整，使用方便
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* @tutorial https://uviewui.com/components/checkbox.html
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* @property {String | Number | Boolean} name checkbox组件的标示符
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* @property {String} shape 形状，square为方形，circle为圆型
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* @property {String | Number} size 整体的大小
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* @property {Boolean} checked 是否默认选中
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* @property {String | Boolean} disabled 是否禁用
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* @property {String} activeColor 选中状态下的颜色，如设置此值，将会覆盖parent的activeColor值
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* @property {String} inactiveColor 未选中的颜色
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* @property {String | Number} iconSize 图标的大小，单位px
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* @property {String} iconColor 图标颜色
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* @property {String | Number} label label提示文字，因为nvue下，直接slot进来的文字，由于特殊的结构，无法修改样式
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* @property {String} labelColor label的颜色
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* @property {String | Number} labelSize label的字体大小，px单位
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* @property {String | Boolean} labelDisabled 是否禁止点击提示语选中复选框
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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 任一个checkbox状态发生变化时触发，回调为一个对象
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* @example <u-checkbox v-model="checked" :disabled="false">天涯</u-checkbox>
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*/
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export default {
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name: "u-checkbox",
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mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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data() {
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return {
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isChecked: false,
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// 父组件的默认值，因为头条小程序不支持在computed中使用this.parent.shape的形式
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// 故只能使用如此方法
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parentData: {
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iconSize: 12,
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labelDisabled: null,
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disabled: null,
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shape: 'square',
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activeColor: null,
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inactiveColor: null,
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size: 18,
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value: null,
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iconColor: null,
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placement: 'row',
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borderBottom: false,
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iconPlacement: 'left'
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}
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}
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},
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computed: {
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// 是否禁用，如果父组件u-raios-group禁用的话，将会忽略子组件的配置
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elDisabled() {
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return this.disabled !== '' ? this.disabled : this.parentData.disabled !== null ? this.parentData.disabled : false;
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},
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// 是否禁用label点击
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elLabelDisabled() {
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return this.labelDisabled !== '' ? this.labelDisabled : this.parentData.labelDisabled !== null ? this.parentData.labelDisabled :
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false;
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},
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// 组件尺寸，对应size的值，默认值为21px
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elSize() {
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return this.size ? this.size : (this.parentData.size ? this.parentData.size : 21);
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},
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// 组件的勾选图标的尺寸，默认12px
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elIconSize() {
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return this.iconSize ? this.iconSize : (this.parentData.iconSize ? this.parentData.iconSize : 12);
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},
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// 组件选中激活时的颜色
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elActiveColor() {
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return this.activeColor ? this.activeColor : (this.parentData.activeColor ? this.parentData.activeColor : '#2979ff');
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},
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// 组件选未中激活时的颜色
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elInactiveColor() {
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return this.inactiveColor ? this.inactiveColor : (this.parentData.inactiveColor ? this.parentData.inactiveColor :
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'#c8c9cc');
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},
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// label的颜色
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elLabelColor() {
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return this.labelColor ? this.labelColor : (this.parentData.labelColor ? this.parentData.labelColor : '#606266')
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},
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// 组件的形状
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elShape() {
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return this.shape ? this.shape : (this.parentData.shape ? this.parentData.shape : 'circle');
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},
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// label大小
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elLabelSize() {
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return uni.$u.addUnit(this.labelSize ? this.labelSize : (this.parentData.labelSize ? this.parentData.labelSize :
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'15'))
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},
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elIconColor() {
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const iconColor = this.iconColor ? this.iconColor : (this.parentData.iconColor ? this.parentData.iconColor :
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'#ffffff');
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// 图标的颜色
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if (this.elDisabled) {
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// disabled状态下，已勾选的checkbox图标改为elInactiveColor
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return this.isChecked ? this.elInactiveColor : 'transparent'
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} else {
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return this.isChecked ? iconColor : 'transparent'
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}
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},
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iconClasses() {
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let classes = []
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// 组件的形状
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classes.push('u-checkbox__icon-wrap--' + this.elShape)
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if (this.elDisabled) {
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classes.push('u-checkbox__icon-wrap--disabled')
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}
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if (this.isChecked && this.elDisabled) {
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classes.push('u-checkbox__icon-wrap--disabled--checked')
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}
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// 支付宝，头条小程序无法动态绑定一个数组类名，否则解析出来的结果会带有","，而导致失效
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// #ifdef MP-ALIPAY || MP-TOUTIAO
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classes = classes.join(' ')
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// #endif
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return classes
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},
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iconWrapStyle() {
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// checkbox的整体样式
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const style = {}
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style.backgroundColor = this.isChecked && !this.elDisabled ? this.elActiveColor : '#ffffff'
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style.borderColor = this.isChecked && !this.elDisabled ? this.elActiveColor : this.elInactiveColor
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style.width = uni.$u.addUnit(this.elSize)
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style.height = uni.$u.addUnit(this.elSize)
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// 如果是图标在右边的话，移除它的右边距
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if (this.parentData.iconPlacement === 'right') {
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style.marginRight = 0
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}
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return style
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},
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checkboxStyle() {
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const style = {}
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if (this.parentData.borderBottom && this.parentData.placement === 'row') {
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uni.$u.error('检测到您将borderBottom设置为true，需要同时将u-checkbox-group的placement设置为column才有效')
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}
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// 当父组件设置了显示下边框并且排列形式为纵向时，给内容和边框之间加上一定间隔
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if (this.parentData.borderBottom && this.parentData.placement === 'column') {
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style.paddingBottom = '8px'
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}
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return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
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}
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},
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mounted() {
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this.init()
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},
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methods: {
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init() {
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// 支付宝小程序不支持provide/inject，所以使用这个方法获取整个父组件，在created定义，避免循环引用
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this.updateParentData()
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if (!this.parent) {
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uni.$u.error('u-checkbox必须搭配u-checkbox-group组件使用')
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}
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// 设置初始化时，是否默认选中的状态，父组件u-checkbox-group的value可能是array，所以额外判断
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if (this.checked) {
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this.isChecked = true
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} else if (uni.$u.test.array(this.parentData.value)) {
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// 查找数组是是否存在this.name元素值
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this.isChecked = this.parentData.value.some(item => {
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return item === this.name
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})
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}
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},
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updateParentData() {
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this.getParentData('u-checkbox-group')
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},
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// 横向两端排列时，点击组件即可触发选中事件
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wrapperClickHandler(e) {
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this.parentData.iconPlacement === 'right' && this.iconClickHandler(e)
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},
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// 点击图标
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iconClickHandler(e) {
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this.preventEvent(e)
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// 如果整体被禁用，不允许被点击
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if (!this.elDisabled) {
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this.setRadioCheckedStatus()
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}
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},
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// 点击label
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labelClickHandler(e) {
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this.preventEvent(e)
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// 如果按钮整体被禁用或者label被禁用，则不允许点击文字修改状态
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if (!this.elLabelDisabled && !this.elDisabled) {
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this.setRadioCheckedStatus()
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}
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},
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emitEvent() {
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this.$emit('change', this.isChecked)
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// 尝试调用u-form的验证方法，进行一定延迟，否则微信小程序更新可能会不及时
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this.$nextTick(() => {
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uni.$u.formValidate(this, 'change')
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})
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},
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// 改变组件选中状态
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// 这里的改变的依据是，更改本组件的checked值为true，同时通过父组件遍历所有u-checkbox实例
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// 将本组件外的其他u-checkbox的checked都设置为false(都被取消选中状态)，因而只剩下一个为选中状态
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setRadioCheckedStatus() {
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// 将本组件标记为与原来相反的状态
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this.isChecked = !this.isChecked
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this.emitEvent()
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typeof this.parent.unCheckedOther === 'function' && this.parent.unCheckedOther(this)
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}
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},
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watch:{
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checked(){
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this.isChecked = this.checked
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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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$u-checkbox-icon-wrap-margin-right:6px !default;
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$u-checkbox-icon-wrap-font-size:6px !default;
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$u-checkbox-icon-wrap-border-width:1px !default;
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$u-checkbox-icon-wrap-border-color:#c8c9cc !default;
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$u-checkbox-icon-wrap-icon-line-height:0 !default;
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$u-checkbox-icon-wrap-circle-border-radius:100% !default;
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$u-checkbox-icon-wrap-square-border-radius:3px !default;
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$u-checkbox-icon-wrap-checked-color:#fff !default;
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$u-checkbox-icon-wrap-checked-background-color:red !default;
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$u-checkbox-icon-wrap-checked-border-color:#2979ff !default;
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$u-checkbox-icon-wrap-disabled-background-color:#ebedf0 !default;
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$u-checkbox-icon-wrap-disabled-checked-color:#c8c9cc !default;
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$u-checkbox-label-margin-left:5px !default;
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$u-checkbox-label-margin-right:12px !default;
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$u-checkbox-label-color:$u-content-color !default;
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$u-checkbox-label-font-size:15px !default;
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$u-checkbox-label-disabled-color:#c8c9cc !default;
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.u-checkbox {
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/* #ifndef APP-NVUE */
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@include flex(row);
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/* #endif */
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overflow: hidden;
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flex-direction: row;
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align-items: center;
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&-label--left {
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flex-direction: row
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}
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&-label--right {
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flex-direction: row-reverse;
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justify-content: space-between
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}
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&__icon-wrap {
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/* #ifndef APP-NVUE */
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box-sizing: border-box;
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// nvue下，border-color过渡有问题
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transition-property: border-color, background-color, color;
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transition-duration: 0.2s;
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/* #endif */
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color: $u-content-color;
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@include flex;
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align-items: center;
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justify-content: center;
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color: transparent;
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text-align: center;
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margin-right: $u-checkbox-icon-wrap-margin-right;
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font-size: $u-checkbox-icon-wrap-font-size;
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border-width: $u-checkbox-icon-wrap-border-width;
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border-color: $u-checkbox-icon-wrap-border-color;
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border-style: solid;
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/* #ifdef MP-TOUTIAO */
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// 头条小程序兼容性问题，需要设置行高为0，否则图标偏下
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&__icon {
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line-height: $u-checkbox-icon-wrap-icon-line-height;
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}
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/* #endif */
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&--circle {
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border-radius: $u-checkbox-icon-wrap-circle-border-radius;
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}
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&--square {
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border-radius: $u-checkbox-icon-wrap-square-border-radius;
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}
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&--checked {
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color: $u-checkbox-icon-wrap-checked-color;
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background-color: $u-checkbox-icon-wrap-checked-background-color;
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border-color: $u-checkbox-icon-wrap-checked-border-color;
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}
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&--disabled {
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background-color: $u-checkbox-icon-wrap-disabled-background-color !important;
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}
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&--disabled--checked {
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color: $u-checkbox-icon-wrap-disabled-checked-color !important;
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}
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}
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&__label {
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/* #ifndef APP-NVUE */
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word-wrap: break-word;
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/* #endif */
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margin-left: $u-checkbox-label-margin-left;
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margin-right: $u-checkbox-label-margin-right;
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color: $u-checkbox-label-color;
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font-size: $u-checkbox-label-font-size;
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&--disabled {
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color: $u-checkbox-label-disabled-color;
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}
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}
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}
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</style>
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