u-list-item.vue
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<template>
<!-- #ifdef APP-NVUE -->
<cell>
<!-- #endif -->
<view
class="u-list-item"
:ref="`u-list-item-${anchor}`"
:anchor="`u-list-item-${anchor}`"
:class="[`u-list-item-${anchor}`]"
>
<slot />
</view>
<!-- #ifdef APP-NVUE -->
</cell>
<!-- #endif -->
</template>
<script>
import props from './props.js';
// #ifdef APP-NVUE
const dom = uni.requireNativePlugin('dom')
// #endif
/**
* List 列表
* @description 该组件为高性能列表组件
* @tutorial https://www.uviewui.com/components/list.html
* @property {String | Number} anchor 用于滚动到指定item
* @example <u-list-ite v-for="(item, index) in indexList" :key="index" ></u-list-item>
*/
export default {
name: 'u-list-item',
mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
data() {
return {
// 节点信息
rect: {},
index: 0,
show: true,
sys: uni.$u.sys()
}
},
computed: {
},
inject: ['uList'],
watch: {
// #ifndef APP-NVUE
'uList.innerScrollTop'(n) {
const preLoadScreen = this.uList.preLoadScreen
const windowHeight = this.sys.windowHeight
if(n <= windowHeight * preLoadScreen) {
this.parent.updateOffsetFromChild(0)
} else if (this.rect.top <= n - windowHeight * preLoadScreen) {
this.parent.updateOffsetFromChild(this.rect.top)
}
}
// #endif
},
created() {
this.parent = {}
},
mounted() {
this.init()
},
methods: {
init() {
// 初始化数据
this.updateParentData()
this.index = this.parent.children.indexOf(this)
this.resize()
},
updateParentData() {
// 此方法在mixin中
this.getParentData('u-list')
},
resize() {
this.queryRect(`u-list-item-${this.anchor}`).then(size => {
const lastChild = this.parent.children[this.index - 1]
this.rect = size
const preLoadScreen = this.uList.preLoadScreen
const windowHeight = this.sys.windowHeight
// #ifndef APP-NVUE
if (lastChild) {
this.rect.top = lastChild.rect.top + lastChild.rect.height
}
if (size.top >= this.uList.innerScrollTop + (1 + preLoadScreen) * windowHeight) this.show =
false
// #endif
})
},
// 查询元素尺寸
queryRect(el) {
return new Promise(resolve => {
// #ifndef APP-NVUE
this.$uGetRect(`.${el}`).then(size => {
resolve(size)
})
// #endif
// #ifdef APP-NVUE
const ref = this.$refs[el]
dom.getComponentRect(ref, res => {
resolve(res.size)
})
// #endif
})
}
}
}
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
.u-list-item {}
</style>