130 lines
		
	
	
		
			3.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			130 lines
		
	
	
		
			3.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
| <template>
 | ||
| 	<u-transition
 | ||
| 	    mode="fade"
 | ||
| 	    :customStyle="backTopStyle"
 | ||
| 	    :show="show"
 | ||
| 	>
 | ||
| 		<view
 | ||
| 		    class="u-back-top"
 | ||
| 			:style="[contentStyle]"
 | ||
| 		    v-if="!$slots.default && !$slots.$default"
 | ||
| 			@click="backToTop"
 | ||
| 		>
 | ||
| 			<u-icon
 | ||
| 			    :name="icon"
 | ||
| 			    :custom-style="iconStyle"
 | ||
| 			></u-icon>
 | ||
| 			<text
 | ||
| 			    v-if="text"
 | ||
| 			    class="u-back-top__text"
 | ||
| 			>{{text}}</text>
 | ||
| 		</view>
 | ||
| 		<slot v-else />
 | ||
| 	</u-transition>
 | ||
| </template>
 | ||
| 
 | ||
| <script>
 | ||
| 	import props from './props.js';
 | ||
| 	// #ifdef APP-NVUE
 | ||
| 	const dom = weex.requireModule('dom')
 | ||
| 	// #endif
 | ||
| 	/**
 | ||
| 	 * backTop 返回顶部
 | ||
| 	 * @description 本组件一个用于长页面,滑动一定距离后,出现返回顶部按钮,方便快速返回顶部的场景。
 | ||
| 	 * @tutorial https://uviewui.com/components/backTop.html
 | ||
| 	 * 
 | ||
| 	 * @property {String}			mode  		返回顶部的形状,circle-圆形,square-方形 (默认 'circle' )
 | ||
| 	 * @property {String} 			icon 		自定义图标 (默认 'arrow-upward' ) 见官方文档示例
 | ||
| 	 * @property {String} 			text 		提示文字 
 | ||
| 	 * @property {String | Number}  duration	返回顶部滚动时间 (默认 100)
 | ||
| 	 * @property {String | Number}  scrollTop	滚动距离 (默认 0 )
 | ||
| 	 * @property {String | Number}  top  		距离顶部多少距离显示,单位px (默认 400 )
 | ||
| 	 * @property {String | Number}  bottom  	返回顶部按钮到底部的距离,单位px (默认 100 )
 | ||
| 	 * @property {String | Number}  right  		返回顶部按钮到右边的距离,单位px (默认 20 )
 | ||
| 	 * @property {String | Number}  zIndex 		层级   (默认 9 )
 | ||
| 	 * @property {Object<Object>}  	iconStyle 	图标的样式,对象形式   (默认 {color: '#909399',fontSize: '19px'})
 | ||
| 	 * @property {Object}			customStyle	定义需要用到的外部样式
 | ||
| 	 * 
 | ||
| 	 * @example <u-back-top :scrollTop="scrollTop"></u-back-top>
 | ||
| 	 */
 | ||
| 	export default {
 | ||
| 		name: 'u-back-top',
 | ||
| 		mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
 | ||
| 		computed: {
 | ||
| 			backTopStyle() {
 | ||
| 				// 动画组件样式
 | ||
| 				const style = {
 | ||
| 					bottom: uni.$u.addUnit(this.bottom),
 | ||
| 					right: uni.$u.addUnit(this.right),
 | ||
| 					width: '40px',
 | ||
| 					height: '40px',
 | ||
| 					position: 'fixed',
 | ||
| 					zIndex: 10,
 | ||
| 				}
 | ||
| 				return style
 | ||
| 			},
 | ||
| 			show() {
 | ||
| 				return uni.$u.getPx(this.scrollTop) > uni.$u.getPx(this.top)
 | ||
| 			},
 | ||
| 			contentStyle() {
 | ||
| 				const style = {}
 | ||
| 				let radius = 0
 | ||
| 				// 是否圆形
 | ||
| 				if(this.mode === 'circle') {
 | ||
| 					radius = '100px'
 | ||
| 				} else {
 | ||
| 					radius = '4px'
 | ||
| 				}
 | ||
| 				// 为了兼容安卓nvue,只能这么分开写
 | ||
| 				style.borderTopLeftRadius = radius
 | ||
| 				style.borderTopRightRadius = radius
 | ||
| 				style.borderBottomLeftRadius = radius
 | ||
| 				style.borderBottomRightRadius = radius
 | ||
| 				return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
 | ||
| 			}
 | ||
| 		},
 | ||
| 		methods: {
 | ||
| 			backToTop() {
 | ||
| 				// #ifdef APP-NVUE
 | ||
| 				if (!this.$parent.$refs['u-back-top']) {
 | ||
| 					uni.$u.error(`nvue页面需要给页面最外层元素设置"ref='u-back-top'`)
 | ||
| 				}
 | ||
| 				dom.scrollToElement(this.$parent.$refs['u-back-top'], {
 | ||
| 					offset: 0
 | ||
| 				})
 | ||
| 				// #endif
 | ||
| 				
 | ||
| 				// #ifndef APP-NVUE
 | ||
| 				uni.pageScrollTo({
 | ||
| 					scrollTop: 0,
 | ||
| 					duration: this.duration
 | ||
| 				});
 | ||
| 				// #endif
 | ||
| 				this.$emit('click')
 | ||
| 			}
 | ||
| 		}
 | ||
| 	}
 | ||
| </script>
 | ||
| 
 | ||
| <style lang="scss" scoped>
 | ||
| 	@import '../../libs/css/components.scss';
 | ||
|      $u-back-top-flex:1 !default;
 | ||
|      $u-back-top-height:100% !default;
 | ||
|      $u-back-top-background-color:#E1E1E1 !default;
 | ||
|      $u-back-top-tips-font-size:12px !default;
 | ||
| 	.u-back-top {
 | ||
| 		@include flex;
 | ||
| 		flex-direction: column;
 | ||
| 		align-items: center;
 | ||
| 		flex:$u-back-top-flex;
 | ||
| 		height: $u-back-top-height;
 | ||
| 		justify-content: center;
 | ||
| 		background-color: $u-back-top-background-color;
 | ||
| 
 | ||
| 		&__tips {
 | ||
| 			font-size:$u-back-top-tips-font-size;
 | ||
| 			transform: scale(0.8);
 | ||
| 		}
 | ||
| 	}
 | ||
| </style>
 |