| <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>
 |