235 lines
7.8 KiB
Vue
235 lines
7.8 KiB
Vue
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<!-- 自定义底部导航项 -->
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<template>
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<view class="u-tabbar-item" :style="[addStyle(customStyle)]">
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<view v-if="isCenter" class="tabbar-center-item">
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<image class="center-image" :src="centerImage" mode="aspectFill"></image>
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</view>
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<template v-else>
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<view class="u-tabbar-item__icon">
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<image
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v-if="icon"
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:name="icon"
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:color="isActive ? parentData.activeColor : parentData.color"
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:size="20"
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></image>
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<block v-else>
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<slot v-if="isActive" name="active-icon" />
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<slot v-else name="inactive-icon" />
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</block>
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<!-- <u-badge
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absolute
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:offset="[0, dot ? '34rpx' : badge > 9 ? '14rpx' : '20rpx']"
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:customStyle="badgeStyle"
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:isDot="dot"
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:value="badge || (dot ? 1 : null)"
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:show="dot || badge > 0"
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></u-badge> -->
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</view>
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<slot name="text">
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<text
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class="u-tabbar-item__text"
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:style="{
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color: isActive ? parentData.activeColor : parentData.color,
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}"
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>
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{{ text }}
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</text>
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</slot>
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</template>
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</view>
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</template>
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<script>
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/**
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* TabbarItem 底部导航栏子组件
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* @description 此组件提供了自定义tabbar的能力。
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* @property {String | Number} name item标签的名称，作为与u-tabbar的value参数匹配的标识符
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* @property {String} icon uView内置图标或者绝对路径的图片
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* @property {String | Number} badge 右上角的角标提示信息
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* @property {Boolean} dot 是否显示圆点，将会覆盖badge参数（默认 false ）
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* @property {String} text 描述文本
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* @property {Object | String} badgeStyle 控制徽标的位置，对象或者字符串形式，可以设置top和right属性（默认 'top: 6px;right:2px;' ）
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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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*/
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import { deepMerge, addStyle, sleep, $parent } from '@/peach/helper'
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export default {
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name: 'pb-tabbar-item',
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props: {
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customStyle: {
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type: [Object, String],
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default: () => ({}),
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},
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customClass: {
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type: String,
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default: '',
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},
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// 跳转的页面路径
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url: {
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type: String,
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default: '',
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},
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// 页面跳转的类型
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linkType: {
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type: String,
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default: 'navigateTo',
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},
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// item标签的名称，作为与u-tabbar的value参数匹配的标识符
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name: {
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type: [String, Number, null],
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default: '',
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},
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// uView内置图标或者绝对路径的图片
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icon: {
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icon: String,
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default: '',
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},
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// 右上角的角标提示信息
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badge: {
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type: [String, Number, null],
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default: '',
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},
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// 是否显示圆点，将会覆盖badge参数
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dot: {
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type: Boolean,
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default: false,
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},
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// 描述文本
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text: {
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type: String,
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default: '',
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},
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// 控制徽标的位置，对象或者字符串形式，可以设置top和right属性
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badgeStyle: {
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type: [Object, String],
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default: '',
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},
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isCenter: {
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type: Boolean,
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default: false,
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},
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centerImage: {
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type: String,
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default: '',
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},
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},
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data() {
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return {
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isActive: false, // 是否处于激活状态
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addStyle,
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parentData: {
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value: null,
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activeColor: '',
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color: '',
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},
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parent: {},
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}
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},
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created() {
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this.init()
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},
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methods: {
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getParentData(parentName = '') {
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// 避免在created中去定义parent变量
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if (!this.parent) this.parent = {}
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// 这里的本质原理是，通过获取父组件实例(也即类似u-radio的父组件u-radio-group的this)
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// 将父组件this中对应的参数，赋值给本组件(u-radio的this)的parentData对象中对应的属性
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// 之所以需要这么做，是因为所有端中，头条小程序不支持通过this.parent.xxx去监听父组件参数的变化
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// 此处并不会自动更新子组件的数据，而是依赖父组件u-radio-group去监听data的变化，手动调用更新子组件的方法去重新获取
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this.parent = $parent.call(this, parentName)
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if (this.parent.children) {
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// 如果父组件的children不存在本组件的实例，才将本实例添加到父组件的children中
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this.parent.children.indexOf(this) === -1 && this.parent.children.push(this)
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}
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if (this.parent && this.parentData) {
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// 历遍parentData中的属性，将parent中的同名属性赋值给parentData
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Object.keys(this.parentData).map((key) => {
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this.parentData[key] = this.parent[key]
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})
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}
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},
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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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console.log('u-tabbar-item必须搭配u-tabbar组件使用')
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}
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// 本子组件在u-tabbar的children数组中的索引
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const index = this.parent.children.indexOf(this)
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// 判断本组件的name(如果没有定义name，就用index索引)是否等于父组件的value参数
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this.isActive = (this.name.split('?')[0] || index) === this.parentData.value
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},
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updateParentData() {
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// 此方法在mixin中
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this.getParentData('pb-s-tabbar')
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},
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// 此方法将会被父组件u-tabbar调用
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updateFromParent() {
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// 重新初始化
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this.init()
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},
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clickHandler() {
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this.$nextTick(() => {
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const index = this.parent.children.indexOf(this)
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const name = this.name || index
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// 点击的item为非激活的item才发出change事件
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if (name !== this.parent.value) {
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this.parent.$emit('change', name)
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}
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this.$emit('click', name)
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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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.tabbar-center-item {
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height: 40px;
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width: 40px;
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display: flex;
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align-items: center;
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justify-content: center;
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border-radius: 50%;
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background-color: rebeccapurple;
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transform: scale(1.3) translateY(-6px);
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position: absolute;
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z-index: 2;
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.center-image {
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width: 25px;
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height: 25px;
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}
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}
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.u-tabbar-item {
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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flex: 1;
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position: relative;
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z-index: 1;
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&__icon {
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display: flex;
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position: relative;
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width: 150rpx;
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justify-content: center;
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}
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&__text {
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margin-top: 2px;
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font-size: 12px;
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color: var(--textSize);
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}
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}
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/* #ifdef MP */
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// 由于小程序都使用shadow DOM形式实现，需要给影子宿主设置flex: 1才能让其撑开
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:host {
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flex: 1;
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}
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/* #endif */
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</style>
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