You can not select more than 25 topics
			Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
		
		
		
		
		
			
		
			
				
					
					
						
							129 lines
						
					
					
						
							3.7 KiB
						
					
					
				
			
		
		
		
			
			
			
				
					
				
				
					
				
			
		
		
	
	
							129 lines
						
					
					
						
							3.7 KiB
						
					
					
				
								<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>
							 |