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<template>
<view class="u-tabbar">
<view
class="u-tabbar__content"
ref="u-tabbar__content"
@touchmove.stop.prevent="noop"
:class="[border && 'u-border-top', fixed && 'u-tabbar--fixed']"
:style="[tabbarStyle]"
>
<view class="u-tabbar__content__item-wrapper">
<slot />
</view>
<u-safe-bottom v-if="safeAreaInsetBottom"></u-safe-bottom>
</view>
<view
class="u-tabbar__placeholder"
v-if="placeholder"
:style="{
height: placeholderHeight + 'px',
}"
></view>
</view>
</template>
<script>
import props from './props.js';
// #ifdef APP-NVUE
const dom = uni.requireNativePlugin('dom')
// #endif
/**
* Tabbar 底部导航栏
* @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} value 当前匹配项的name
* @property {Boolean} safeAreaInsetBottom 是否为iPhoneX留出底部安全距离(默认 true )
* @property {Boolean} border 是否显示上方边框(默认 true )
* @property {String | Number} zIndex 元素层级z-index(默认 1 )
* @property {String} activeColor 选中标签的颜色(默认 '#1989fa' )
* @property {String} inactiveColor 未选中标签的颜色(默认 '#7d7e80' )
* @property {Boolean} fixed 是否固定在底部(默认 true )
* @property {Boolean} placeholder fixed定位固定在底部时,是否生成一个等高元素防止塌陷(默认 true )
* @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',
mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
data() {
return {
placeholderHeight: 0
}
},
computed: {
tabbarStyle() {
const style = {
zIndex: this.zIndex
}
// 合并来自父组件的customStyle样式
return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
},
// 监听多个参数的变化,通过在computed执行对应的操作
updateChild() {
return [this.value, this.activeColor, this.inactiveColor]
},
updatePlaceholder() {
return [this.fixed, this.placeholder]
}
},
watch: {
updateChild() {
// 如果updateChildren中的元素发生了变化,则执行子元素初始化操作
this.updateChildren()
},
updatePlaceholder() {
// 如果fixed,placeholder等参数发生变化,重新计算占位元素的高度
this.setPlaceholderHeight()
}
},
created() {
this.children = []
},
mounted() {
this.setPlaceholderHeight()
},
methods: {
updateChildren() {
// 如果存在子元素,则执行子元素的updateFromParent进行更新数据
this.children.length && this.children.map(child => child.updateFromParent())
},
// 设置用于防止塌陷元素的高度
async setPlaceholderHeight() {
if (!this.fixed || !this.placeholder) return
// 延时一定时间
await uni.$u.sleep(20)
// #ifndef APP-NVUE
this.$uGetRect('.u-tabbar__content').then(({height = 50}) => {
// 修复IOS safearea bottom 未填充高度
this.placeholderHeight = height
})
// #endif
// #ifdef APP-NVUE
dom.getComponentRect(this.$refs['u-tabbar__content'], (res) => {
const {
size
} = res
this.placeholderHeight = size.height
})
// #endif
}
}
}
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
.u-tabbar {
@include flex(column);
flex: 1;
justify-content: center;
&__content {
@include flex(column);
background-color: #fff;
&__item-wrapper {
height: 50px;
@include flex(row);
}
}
&--fixed {
position: fixed;
bottom: 0;
left: 0;
right: 0;
}
}
</style>