<template>
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<view class="tn-scroll-view-class tn-scroll-view">
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<scroll-view
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class="scroll-view"
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:style="[scrollViewStyle]"
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scroll-y
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scroll-anchoring
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enable-back-to-top
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:throttle="false"
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:scroll-top="scrollTop"
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:lower-threshold="lowerThreshold"
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@scroll="handleScroll"
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@touchend="handleTouchEnd"
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@touchmove.prevent.stop="handleTouchMove"
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@touchstart="handleTouchStart"
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@scrolltolower="handleScrollTolower"
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>
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<view class="scroll__content" :style="[scrollContentStyle]">
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<view class="scroll__pull-down">
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<slot name="pulldown">
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<view class="scroll__refresh" :style="[refreshStyle]">
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<view><tn-loading :animation="refreshing"></tn-loading></view>
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<view class="scroll__refresh--text" :style="[refreshTextStyle]">{{ refreshStateText }}</view>
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</view>
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</slot>
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</view>
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<view :id="elScrollDataId" class="scroll__data">
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<slot></slot>
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</view>
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</view>
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</scroll-view>
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</view>
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</template>
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<script>
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import componentsColor from '../../libs/mixin/components_color.js'
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export default {
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name: 'tn-scroll-view',
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mixins: [ componentsColor ],
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props: {
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// H5顶部导航栏的高度
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h5NavHeight: {
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type: Number,
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default: 45
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},
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// 自定义顶部导航栏高度
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customNavHeight: {
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type: Number,
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default: 0
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},
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// 可滚动区域顶部偏移高度
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offsetTop: {
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type: Number,
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default: 0
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},
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// 可滚动区域底部偏移高度
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offsetBottom: {
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type: Number,
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default: 0
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},
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// 容器高度 (不设置则自动计算)
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height: {
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type: Number,
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default: null
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},
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// 是否禁用
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disabled: {
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type: Boolean,
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default: false
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},
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// 禁用下拉刷新
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pullDownDisabled: {
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type: Boolean,
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default: false
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},
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// 下拉速率
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pullDownSpeed: {
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type: Number,
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default: 0.5
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},
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// 刷新延迟
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refreshDelayed: {
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type: Number,
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default: 800
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},
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// 刷新完成后延迟
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refreshFinishDelayed: {
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type: Number,
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default: 800
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},
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// 下拉刷新距离
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refresherThreshold: {
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type: Number,
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default: 70
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},
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// 上拉加载距离
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lowerThreshold: {
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type: Number,
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default: 40
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},
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// 刷新状态
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refreshState: {
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type: Boolean,
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default: false
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},
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// 正在刷新文字
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refreshingText: {
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type: String,
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default: '正在刷新'
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},
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// 刷新成功文字
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refreshSuccessText: {
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type: String,
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default: '刷新成功'
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},
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// 下拉中的文字
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pulldownText: {
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type: String,
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default: '下拉刷新'
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},
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// 下拉完成的文字
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pulldownFinishText: {
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type: String,
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default: '松开刷新'
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}
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},
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data() {
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return {
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// 滚动容器内容id
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elScrollDataId: '',
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// 系统信息
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systemInfo: {
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height: 0,
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statusBarHeight: 0
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},
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// 距离顶部滚动高度
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scrollTop: 0,
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// 滚动内容视图顶部位置
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scrollDataTop: -1,
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// 滚动内容视图顶部位置偏移
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scrollDataOffsetTop: -1,
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// 滚动区域的高度
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scrollViewHeight: 0,
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// 当前滚动高度
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currentScrollTop: 0,
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// 当前触摸点Y轴开始坐标
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currentTouchStartY: 0,
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// 刷新状态文字
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refreshStateText: '下拉刷新',
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// 是否刷新中
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refreshing: false,
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// 是否刷新完成
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refreshFinish: false,
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// 是否正在下拉
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pulldowning: false,
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// 下拉高度
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pullDownHeight: 0,
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// 是否显示下拉加载
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showPullDown: false
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}
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},
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computed: {
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scrollViewStyle() {
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let style = {}
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style.height = this.scrollViewHeight + 'px'
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if (!this.backgroundColorClass) {
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style.backgroundColor = this.backgroundColorStyle
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}
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return style
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},
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scrollContentStyle() {
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let style = {}
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style.transform = this.showPullDown ? `translateY(${this.pullDownHeight}px)` : `translateY(0px)`
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style.transition = this.pulldowning ? `transform 100ms ease-out` : `transform 500ms cubic-bezier(0.19,1.64,0.42,0.72)`
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return style
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},
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refreshStyle() {
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let style = {}
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style.opacity = this.showPullDown ? 1 : 0
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return style
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},
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refreshTextStyle() {
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let style = {}
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if (!this.fontColorClass) {
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style.color = this.fontColorStyle
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}
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return style
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},
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loadTextStyle() {
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let style = {}
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if (!this.fontColorClass) {
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style.color = this.fontColorStyle
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}
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return style
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}
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},
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watch: {
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refreshState(nVal, oVal) {
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if (!nVal) {
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if (this.showPullDown) {
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// 关闭正在下拉
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this.pulldowning = false
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// 隐藏下拉刷新
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this.showPullDown = false
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// 关闭正在刷新
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this.refreshing = false
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}
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}
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}
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},
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created() {
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this.elScrollDataId = this.$t.uuid()
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this.getSystemInfo()
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},
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mounted() {
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this.$nextTick(() => {
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this.init()
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})
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},
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methods: {
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// 组件初始化
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init() {
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this.refreshStateText = this.pulldownText
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// 初始化scrollView信息
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this.updateScrollViewInfo()
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},
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// 获取系统信息
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getSystemInfo() {
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const systemInfo = uni.getSystemInfoSync()
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this.systemInfo.height = systemInfo.safeArea.height
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this.systemInfo.statusBarHeight = systemInfo.statusBarHeight
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},
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// 更新scrollView信息
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updateScrollViewInfo() {
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if (this.height) {
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this.scrollViewHeight = this.height
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} else {
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// 设置scrollView的高度和组件顶部位置
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// console.log(this.systemInfo, this.offsetTop, this.customNavHeight);
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// #ifdef H5
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this.scrollViewHeight = this.systemInfo.height - (
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this.offsetTop +
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(this.customNavHeight ? this.customNavHeight : this.h5NavHeight) +
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this.offsetBottom)
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this.scrollDataOffsetTop = this.offsetTop + (this.customNavHeight ? this.customNavHeight : this.h5NavHeight)
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// #endif
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// #ifndef H5
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this.scrollViewHeight = this.systemInfo.height - (
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this.offsetTop +
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this.systemInfo.statusBarHeight +
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this.offsetBottom)
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this.scrollDataOffsetTop = this.offsetTop + this.systemInfo.statusBarHeight
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// #endif
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}
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},
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// 获取scrollView内容信息
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async getScrollDataInfo() {
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const scrollInfo = await this._tGetRect(`#${this.elScrollDataId}`)
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this.scrollDataTop = scrollInfo.top
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},
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// 上拉触底事件
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handleScrollTolower(e) {
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if (this.pullUpDisabled) return
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this.$emit('scrolltolower', e)
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},
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// 滚动事件
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handleScroll(e) {
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this.currentScrollTop = e.detail.scrollTop
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this.$emit('scroll', e.detail)
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},
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// 触摸按下事件
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handleTouchStart(e) {
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if (this.disabled) return
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this.currentTouchStartY = e.touches[0].clientY
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this.getScrollDataInfo()
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this.$emit('touchStart', e)
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},
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// 触摸下滑事件
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handleTouchMove(e) {
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if (this.disabled) return
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if (this.currentScrollTop == 0 && e.touches[0].clientY >= this.currentTouchStartY) {
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// 容器滑动的偏移
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const moveOffset = this.scrollDataTop > 0 ?
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(this.scrollDataOffsetTop - this.scrollDataTop) :
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(Math.abs(this.scrollDataTop) + this.scrollDataOffsetTop)
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this.pulldowning = true
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this.showPullDown = true
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let pullDownDistance = ((e.touches[0].clientY - this.currentTouchStartY) - moveOffset) * this.pullDownSpeed
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this.pullDownHeight = pullDownDistance
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// this.pullDownHeight = pullDownDistance > this.refresherThreshold ? this.refresherThreshold : pullDownDistance
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this.refreshStateText = this.pullDownHeight >= this.refresherThreshold ? this.pulldownFinishText : this.pulldownText
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if (pullDownDistance > this.refresherThreshold) {
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this.$emit('refreshReady')
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}
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}
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this.$emit('touchMove', e)
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},
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// 触摸松开处理
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handleTouchEnd(e) {
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if (this.disabled) return
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// 处理下拉刷新
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if (this.showPullDown) {
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// 当下拉高度小于下拉阈值
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if (this.pullDownHeight < this.refresherThreshold) {
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// 关闭正在下拉
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this.pulldowning = false
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// 重置下拉高度
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this.pullDownHeight = 0
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// 隐藏下拉刷新
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this.showPullDown = false
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// 触发下拉中断事件
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this.$emit('refreshStop')
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} else {
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this.pullDownHeight = this.pullDownHeight > this.refresherThreshold ? this.refresherThreshold : this.pullDownHeight
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this.refresh()
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}
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}
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// 触发下拉触摸松开事件
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this.$emit('touchEnd', e)
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},
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// 刷新数据
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refresh() {
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// 设置刷新未完成
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this.refreshFinish = false
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// 开启正在刷新
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this.refreshing = true
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// 设置正在刷新状态文字
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this.refreshStateText = this.refreshingText
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// 触发refresh事件
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setTimeout(() => {
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this.$emit('refresh')
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}, this.refreshDelayed)
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},
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}
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}
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</script>
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<style lang="scss" scoped>
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.tn-scroll-view {
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.scroll-view {
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position: relative;
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touch-action: none;
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.scroll__content {
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display: flex;
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will-change: transform;
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flex-direction: column;
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.scroll {
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&__pull-down {
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position: absolute;
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left: 0;
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width: 100%;
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display: flex;
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padding: 30rpx 0;
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align-items: center;
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justify-content: center;
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transform: translateY(-100%);
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}
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&__refresh {
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display: flex;
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align-items: center;
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justify-content: center;
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&--text {
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margin-left: 10rpx;
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}
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}
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&__data {
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}
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&__pull-up {
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position: absolute;
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left: 0;
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bottom: 0;
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width: 100%;
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display: flex;
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align-items: center;
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justify-content: center;
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transform: translateY(100%);
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}
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&__load {
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padding: 20rpx 0;
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display: flex;
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align-items: center;
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justify-content: center;
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&--text {
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margin-left: 10rpx;
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}
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}
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}
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}
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}
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}
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</style>
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