143 lines
		
	
	
		
			3.9 KiB
		
	
	
	
		
			Vue
		
	
	
	
		
		
			
		
	
	
			143 lines
		
	
	
		
			3.9 KiB
		
	
	
	
		
			Vue
		
	
	
	
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								<template>
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									<view
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									    class="u-tabbar-item"
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									    :style="[$u.addStyle(customStyle)]"
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									    @tap="clickHandler"
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									>
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										<view class="u-tabbar-item__icon">
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											<u-icon
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											    v-if="icon"
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											    :name="icon"
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											    :color="isActive? parentData.activeColor : parentData.inactiveColor"
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											    :size="20"
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											></u-icon>
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											<template v-else>
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												<slot
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												    v-if="isActive"
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												    name="active-icon"
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												/>
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												<slot
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												    v-else
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												    name="inactive-icon"
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												/>
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											</template>
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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.inactiveColor
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												}"
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											>{{ text }}</text>
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										</slot>
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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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									 * 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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									 * @tutorial https://www.uviewui.com/components/tabbar.html
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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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									 * @example <u-tabbar :value="value2" :placeholder="false" @change="name => value2 = name" :fixed="false" :safeAreaInsetBottom="false"><u-tabbar-item text="首页" icon="home" dot ></u-tabbar-item></u-tabbar>
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									 */
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									export default {
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										name: 'u-tabbar-item',
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										mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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										data() {
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											return {
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												isActive: false, // 是否处于激活状态
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												parentData: {
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													value: null,
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													activeColor: '',
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													inactiveColor: ''
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												}
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											}
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										},
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										created() {
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											this.init()
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										},
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										methods: {
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											init() {
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												// 支付宝小程序不支持provide/inject,所以使用这个方法获取整个父组件,在created定义,避免循环引用
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												this.updateParentData()
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												if (!this.parent) {
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													uni.$u.error('u-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 || 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('u-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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									@import "../../libs/css/components.scss";
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									.u-tabbar-item {
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										@include flex(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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										&__icon {
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											@include 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: $u-content-color;
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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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