| <template> | 
|     <!-- #ifdef APP-NVUE --> | 
|     <list | 
|         class="u-list" | 
|         :enableBackToTop="enableBackToTop" | 
|         :loadmoreoffset="lowerThreshold" | 
|         :showScrollbar="showScrollbar" | 
|         :style="[listStyle]" | 
|         :offset-accuracy="Number(offsetAccuracy)" | 
|         @scroll="onScroll" | 
|         @loadmore="scrolltolower" | 
|     > | 
|         <slot /> | 
|     </list> | 
|     <!-- #endif --> | 
|     <!-- #ifndef APP-NVUE --> | 
|     <scroll-view | 
|         class="u-list" | 
|         :scroll-into-view="scrollIntoView" | 
|         :style="[listStyle]" | 
|         scroll-y | 
|         :scroll-top="Number(scrollTop)" | 
|         :lower-threshold="Number(lowerThreshold)" | 
|         :upper-threshold="Number(upperThreshold)" | 
|         :show-scrollbar="showScrollbar" | 
|         :enable-back-to-top="enableBackToTop" | 
|         :scroll-with-animation="scrollWithAnimation" | 
|         @scroll="onScroll" | 
|         @scrolltolower="scrolltolower" | 
|         @scrolltoupper="scrolltoupper" | 
|     > | 
|         <view> | 
|             <slot /> | 
|         </view> | 
|     </scroll-view> | 
|     <!-- #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 {Boolean}            showScrollbar        控制是否出现滚动条,仅nvue有效 (默认 false ) | 
|      * @property {String | Number}    lowerThreshold        距底部多少时触发scrolltolower事件 (默认 50 ) | 
|      * @property {String | Number}    upperThreshold        距顶部多少时触发scrolltoupper事件,非nvue有效 (默认 0 ) | 
|      * @property {String | Number}    scrollTop            设置竖向滚动条位置(默认 0 ) | 
|      * @property {String | Number}    offsetAccuracy        控制 onscroll 事件触发的频率,仅nvue有效(默认 10 ) | 
|      * @property {Boolean}            enableFlex            启用 flexbox 布局。开启后,当前节点声明了display: flex就会成为flex container,并作用于其孩子节点,仅微信小程序有效(默认 false ) | 
|      * @property {Boolean}            pagingEnabled        是否按分页模式显示List,(默认 false ) | 
|      * @property {Boolean}            scrollable            是否允许List滚动(默认 true ) | 
|      * @property {String}            scrollIntoView        值应为某子元素id(id不能以数字开头) | 
|      * @property {Boolean}            scrollWithAnimation    在设置滚动条位置时使用动画过渡 (默认 false ) | 
|      * @property {Boolean}            enableBackToTop        iOS点击顶部状态栏、安卓双击标题栏时,滚动条返回顶部,只对微信小程序有效 (默认 false ) | 
|      * @property {String | Number}    height                列表的高度 (默认 0 ) | 
|      * @property {String | Number}    width                列表宽度 (默认 0 ) | 
|      * @property {String | Number}    preLoadScreen        列表前后预渲染的屏数,1代表一个屏幕的高度,1.5代表1个半屏幕高度  (默认 1 ) | 
|      * @property {Object}            customStyle            定义需要用到的外部样式 | 
|      * | 
|      * @example <u-list @scrolltolower="scrolltolower"></u-list> | 
|      */ | 
|     export default { | 
|         name: 'u-list', | 
|         mixins: [uni.$u.mpMixin, uni.$u.mixin,props], | 
|         watch: { | 
|             scrollIntoView(n) { | 
|                 this.scrollIntoViewById(n) | 
|             } | 
|         }, | 
|         data() { | 
|             return { | 
|                 // 记录内部滚动的距离 | 
|                 innerScrollTop: 0, | 
|                 // vue下,scroll-view在上拉加载时的偏移值 | 
|                 offset: 0, | 
|                 sys: uni.$u.sys() | 
|             } | 
|         }, | 
|         computed: { | 
|             listStyle() { | 
|                 const style = {}, | 
|                     addUnit = uni.$u.addUnit | 
|                 if (this.width != 0) style.width = addUnit(this.width) | 
|                 if (this.height != 0) style.height = addUnit(this.height) | 
|                 // 如果没有定义列表高度,则默认使用屏幕高度 | 
|                 if (!style.height) style.height = addUnit(this.sys.windowHeight, 'px') | 
|                 return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle)) | 
|             } | 
|         }, | 
|         provide() { | 
|             return { | 
|                 uList: this | 
|             } | 
|         }, | 
|         created() { | 
|             this.refs = [] | 
|             this.children = [] | 
|             this.anchors = [] | 
|         }, | 
|         mounted() {}, | 
|         methods: { | 
|             updateOffsetFromChild(top) { | 
|                 this.offset = top | 
|             }, | 
|             onScroll(e) { | 
|                 let scrollTop = 0 | 
|                 // #ifdef APP-NVUE | 
|                 scrollTop = e.contentOffset.y | 
|                 // #endif | 
|                 // #ifndef APP-NVUE | 
|                 scrollTop = e.detail.scrollTop | 
|                 // #endif | 
|                 this.innerScrollTop = scrollTop | 
|                 this.$emit('scroll', Math.abs(scrollTop)) | 
|             }, | 
|             scrollIntoViewById(id) { | 
|                 // #ifdef APP-NVUE | 
|                 // 根据id参数,找到所有u-list-item中匹配的节点,再通过dom模块滚动到对应的位置 | 
|                 const item = this.refs.find(item => item.$refs[id] ? true : false) | 
|                 dom.scrollToElement(item.$refs[id], { | 
|                     // 是否需要滚动动画 | 
|                     animated: this.scrollWithAnimation | 
|                 }) | 
|                 // #endif | 
|             }, | 
|             // 滚动到底部触发事件 | 
|             scrolltolower(e) { | 
|                 uni.$u.sleep(30).then(() => { | 
|                     this.$emit('scrolltolower') | 
|                 }) | 
|             }, | 
|             // #ifndef APP-NVUE | 
|             // 滚动到底部时触发,非nvue有效 | 
|             scrolltoupper(e) { | 
|                 uni.$u.sleep(30).then(() => { | 
|                     this.$emit('scrolltoupper') | 
|                     // 这一句很重要,能绝对保证在性功能障碍的webview,滚动条到顶时,取消偏移值,让页面置顶 | 
|                     this.offset = 0 | 
|                 }) | 
|             } | 
|             // #endif | 
|         }, | 
|     } | 
| </script> | 
|   | 
| <style lang="scss" scoped> | 
|     @import "../../libs/css/components.scss"; | 
|   | 
|     .u-list { | 
|         @include flex(column); | 
|   | 
|     } | 
| </style> |