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<template>
<view
class="u-tabbar-item"
:style="[$u.addStyle(customStyle)]"
@tap="clickHandler"
>
<view class="u-tabbar-item__icon">
<u-icon
v-if="icon"
:name="icon"
:color="isActive? parentData.activeColor : parentData.inactiveColor"
:size="20"
></u-icon>
<template v-else>
<slot
v-if="isActive"
name="active-icon"
/>
<slot
v-else
name="inactive-icon"
/>
</template>
<u-badge
absolute
:offset="[0, dot ? '34rpx' : badge > 9 ? '14rpx' : '20rpx']"
:customStyle="badgeStyle"
:isDot="dot"
:value="badge || (dot ? 1 : null)"
:show="dot || badge > 0"
></u-badge>
</view>
<slot name="text">
<text
class="u-tabbar-item__text"
:style="{
color: isActive? parentData.activeColor : parentData.inactiveColor
}"
>{{ text }}</text>
</slot>
</view>
</template>
<script>
import props from './props.js';
/**
* TabbarItem 底部导航栏子组件
* @description 此组件提供了自定义tabbar的能力。
* @tutorial https://www.uviewui.com/components/tabbar.html
* @property {String | Number} name item标签的名称作为与u-tabbar的value参数匹配的标识符
* @property {String} icon uView内置图标或者绝对路径的图片
* @property {String | Number} badge 右上角的角标提示信息
* @property {Boolean} dot 是否显示圆点将会覆盖badge参数默认 false
* @property {String} text 描述文本
* @property {Object | String} badgeStyle 控制徽标的位置对象或者字符串形式可以设置top和right属性默认 'top: 6px;right:2px;'
* @property {Object} customStyle 定义需要用到的外部样式
*
* @example <u-tabbar :value="value2" :placeholder="false" @change="name => value2 = name" :fixed="false" :safeAreaInsetBottom="false"><u-tabbar-item text="首页" icon="home" dot ></u-tabbar-item></u-tabbar>
*/
export default {
name: 'u-tabbar-item',
mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
data() {
return {
isActive: false, // 是否处于激活状态
parentData: {
value: null,
activeColor: '',
inactiveColor: ''
}
}
},
created() {
this.init()
},
methods: {
init() {
// 支付宝小程序不支持provide/inject所以使用这个方法获取整个父组件在created定义避免循环引用
this.updateParentData()
if (!this.parent) {
uni.$u.error('u-tabbar-item必须搭配u-tabbar组件使用')
}
// 本子组件在u-tabbar的children数组中的索引
const index = this.parent.children.indexOf(this)
// 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
this.isActive = (this.name || index) === this.parentData.value
},
updateParentData() {
// 此方法在mixin中
this.getParentData('u-tabbar')
},
// 此方法将会被父组件u-tabbar调用
updateFromParent() {
// 重新初始化
this.init()
},
clickHandler() {
this.$nextTick(() => {
const index = this.parent.children.indexOf(this)
const name = this.name || index
// 点击的item为非激活的item才发出change事件
if (name !== this.parent.value) {
this.parent.$emit('change', name)
}
this.$emit('click', name)
})
}
},
}
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
.u-tabbar-item {
@include flex(column);
align-items: center;
justify-content: center;
flex: 1;
&__icon {
@include flex;
position: relative;
width: 150rpx;
justify-content: center;
}
&__text {
margin-top: 2px;
font-size: 12px;
color: $u-content-color;
}
}
/* #ifdef MP */
// 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
:host {
flex: 1
}
/* #endif */
</style>