158 lines
		
	
	
		
			5.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			158 lines
		
	
	
		
			5.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
| <template>
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| 	<!-- #ifdef APP-NVUE -->
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| 	<list
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| 		class="u-list"
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| 		:enableBackToTop="enableBackToTop"
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| 		:loadmoreoffset="lowerThreshold"
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| 		:showScrollbar="showScrollbar"
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| 		:style="[listStyle]"
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| 		:offset-accuracy="Number(offsetAccuracy)"
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| 		@scroll="onScroll"
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| 		@loadmore="scrolltolower"
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| 	>
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| 		<slot />
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| 	</list>
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| 	<!-- #endif -->
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| 	<!-- #ifndef APP-NVUE -->
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| 	<scroll-view
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| 		class="u-list"
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| 		:scroll-into-view="scrollIntoView"
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| 		:style="[listStyle]"
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| 		scroll-y
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| 		:scroll-top="Number(scrollTop)"
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| 		:lower-threshold="Number(lowerThreshold)"
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| 		:upper-threshold="Number(upperThreshold)"
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| 		:show-scrollbar="showScrollbar"
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| 		:enable-back-to-top="enableBackToTop"
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| 		:scroll-with-animation="scrollWithAnimation"
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| 		@scroll="onScroll"
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| 		@scrolltolower="scrolltolower"
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| 		@scrolltoupper="scrolltoupper"
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| 	>
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| 		<view>
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| 			<slot />
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| 		</view>
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| 	</scroll-view>
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| 	<!-- #endif -->
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| </template>
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| 
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| <script>
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| 	import props from './props.js';
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| 	// #ifdef APP-NVUE
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| 	const dom = uni.requireNativePlugin('dom')
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| 	// #endif
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| 	/**
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| 	 * List 列表
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| 	 * @description 该组件为高性能列表组件
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| 	 * @tutorial https://www.uviewui.com/components/list.html
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| 	 * @property {Boolean}			showScrollbar		控制是否出现滚动条,仅nvue有效 (默认 false )
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| 	 * @property {String | Number}	lowerThreshold		距底部多少时触发scrolltolower事件 (默认 50 )
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| 	 * @property {String | Number}	upperThreshold		距顶部多少时触发scrolltoupper事件,非nvue有效 (默认 0 )
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| 	 * @property {String | Number}	scrollTop			设置竖向滚动条位置(默认 0 )
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| 	 * @property {String | Number}	offsetAccuracy		控制 onscroll 事件触发的频率,仅nvue有效(默认 10 )
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| 	 * @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 )
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| 	 * @property {Boolean}			pagingEnabled		是否按分页模式显示List,(默认 false )
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| 	 * @property {Boolean}			scrollable			是否允许List滚动(默认 true )
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| 	 * @property {String}			scrollIntoView		值应为某子元素id(id不能以数字开头)
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| 	 * @property {Boolean}			scrollWithAnimation	在设置滚动条位置时使用动画过渡 (默认 false )
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| 	 * @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 )
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| 	 * @property {String | Number}	height				列表的高度 (默认 0 )
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| 	 * @property {String | Number}	width				列表宽度 (默认 0 )
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| 	 * @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 )
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| 	 * @property {Object}			customStyle			定义需要用到的外部样式
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| 	 *
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| 	 * @example <u-list @scrolltolower="scrolltolower"></u-list>
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| 	 */
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| 	export default {
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| 		name: 'u-list',
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| 		mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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| 		watch: {
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| 			scrollIntoView(n) {
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| 				this.scrollIntoViewById(n)
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| 			}
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| 		},
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| 		data() {
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| 			return {
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| 				// 记录内部滚动的距离
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| 				innerScrollTop: 0,
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| 				// vue下,scroll-view在上拉加载时的偏移值
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| 				offset: 0,
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| 				sys: uni.$u.sys()
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| 			}
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| 		},
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| 		computed: {
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| 			listStyle() {
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| 				const style = {},
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| 					addUnit = uni.$u.addUnit
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| 				if (this.width != 0) style.width = addUnit(this.width)
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| 				if (this.height != 0) style.height = addUnit(this.height)
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| 				// 如果没有定义列表高度,则默认使用屏幕高度
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| 				if (!style.height) style.height = addUnit(this.sys.windowHeight, 'px')
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| 				return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
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| 			}
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| 		},
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| 		provide() {
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| 			return {
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| 				uList: this
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| 			}
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| 		},
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| 		created() {
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| 			this.refs = []
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| 			this.children = []
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| 			this.anchors = []
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| 		},
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| 		mounted() {},
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| 		methods: {
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| 			updateOffsetFromChild(top) {
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| 				this.offset = top
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| 			},
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| 			onScroll(e) {
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| 				let scrollTop = 0
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| 				// #ifdef APP-NVUE
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| 				scrollTop = e.contentOffset.y
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| 				// #endif
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| 				// #ifndef APP-NVUE
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| 				scrollTop = e.detail.scrollTop
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| 				// #endif
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| 				this.innerScrollTop = scrollTop
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| 				this.$emit('scroll', Math.abs(scrollTop))
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| 			},
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| 			scrollIntoViewById(id) {
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| 				// #ifdef APP-NVUE
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| 				// 根据id参数,找到所有u-list-item中匹配的节点,再通过dom模块滚动到对应的位置
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| 				const item = this.refs.find(item => item.$refs[id] ? true : false)
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| 				dom.scrollToElement(item.$refs[id], {
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| 					// 是否需要滚动动画
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| 					animated: this.scrollWithAnimation
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| 				})
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| 				// #endif
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| 			},
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| 			// 滚动到底部触发事件
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| 			scrolltolower(e) {
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| 				uni.$u.sleep(30).then(() => {
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| 					this.$emit('scrolltolower')
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| 				})
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| 			},
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| 			// #ifndef APP-NVUE
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| 			// 滚动到底部时触发,非nvue有效
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| 			scrolltoupper(e) {
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| 				uni.$u.sleep(30).then(() => {
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| 					this.$emit('scrolltoupper')
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| 					// 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
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| 					this.offset = 0
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| 				})
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| 			}
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| 			// #endif
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| 		},
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| 	}
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| </script>
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| 
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| <style lang="scss" scoped>
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| 	@import "../../libs/css/components.scss";
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| 
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| 	.u-list {
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| 		@include flex(column);
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| 
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| 	}
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| </style>
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