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refactor: 架构升级
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小莫唐尼
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# scroll-view
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## Instructions
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可滚动视图区域。用于区域滚动。
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需注意在webview渲染的页面中，区域滚动的性能不及页面滚动。
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使用竖向滚动时，需要给 <scroll-view> 一个固定高度，通过 css 设置 height；使用横向滚动时，需要给 <scroll-view> 添加 white-space: nowrap; 样式。
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### Syntax
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- 使用 `<scroll-view />`（或 `<scroll-view></scroll-view>`，当需要包裹子节点时）。
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- 遇到平台差异时，建议使用条件编译（`#ifdef / #endif`）显式处理。
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#### Properties
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| 属性名 | 类型 | 默认值 | 说明 | 平台差异说明 |
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| --- | --- | --- | --- | --- |
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| scroll-x | Boolean | false | 允许横向滚动 | |
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| scroll-y | Boolean | false | 允许纵向滚动 | |
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| upper-threshold | Number/String | 50 | 距顶部/左边多远时（单位px），触发 scrolltoupper 事件 | |
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| lower-threshold | Number/String | 50 | 距底部/右边多远时（单位px），触发 scrolltolower 事件 | |
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| scroll-top | Number/String | | 设置竖向滚动条位置 | |
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| scroll-left | Number/String | | 设置横向滚动条位置 | |
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| scroll-into-view | String | | 值应为某子元素id（id不能以数字开头）。设置哪个方向可滚动，则在哪个方向滚动到该元素 | |
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| scroll-with-animation | Boolean | false | 在设置滚动条位置时使用动画过渡 | |
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| enable-back-to-top | Boolean | false | iOS点击顶部状态栏、安卓双击标题栏时，滚动条返回顶部，只支持竖向 | app-nvue，微信小程序 |
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| show-scrollbar | Boolean | true | 控制是否出现滚动条 | App-nvue 2.1.5+ |
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| refresher-enabled | Boolean | false | 开启自定义下拉刷新 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| refresher-threshold | Number | 45 | 设置自定义下拉刷新阈值 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| refresher-default-style | String | "black" | 设置自定义下拉刷新默认样式，支持设置 black，white，none，none 表示不使用默认样式 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| refresher-background | String | "#FFF" | 设置自定义下拉刷新区域背景颜色 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| refresher-triggered | Boolean | false | 设置当前下拉刷新状态，true 表示下拉刷新已经被触发，false 表示下拉刷新未被触发 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| enable-flex | Boolean | false | 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。 | 微信小程序 2.7.3、小红书小程序 |
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| scroll-anchoring | Boolean | false | 开启 scroll anchoring 特性，即控制滚动位置不随内容变化而抖动，仅在 iOS 下生效，安卓下可参考 CSS overflow-anchor 属性。 | 微信小程序 2.8.2 |
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#### Events
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| 事件名 | 类型 | 默认值 | 说明 | 平台差异说明 |
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| --- | --- | --- | --- | --- |
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| @scrolltoupper | EventHandle | | 滚动到顶部/左边，会触发 scrolltoupper 事件 | |
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| @scrolltolower | EventHandle | | 滚动到底部/右边，会触发 scrolltolower 事件 | |
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| @scroll | EventHandle | | 滚动时触发，event.detail = {scrollLeft, scrollTop, scrollHeight, scrollWidth, deltaX, deltaY} | |
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| @refresherpulling | EventHandle | | 自定义下拉刷新控件被下拉 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| @refresherrefresh | EventHandle | | 自定义下拉刷新被触发 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| @refresherrestore | EventHandle | | 自定义下拉刷新被复位 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+、小红书小程序 |
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| @refresherabort | EventHandle | | 自定义下拉刷新被中止 | H5、app-vue 2.5.12+,微信小程序基础库2.10.1+ |
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#### Platform Compatibility
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See official docs for platform support table: `https://uniapp.dcloud.net.cn/component/scroll-view.html`
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### Examples
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### Example (Example 1)
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```vue
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<!-- 本示例未包含完整css，获取外链css请参考上文，在hello uni-app项目中查看 -->
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<template>
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<view>
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<view class="uni-padding-wrap uni-common-mt">
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<view class="uni-title uni-common-mt">
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Vertical Scroll
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<text>\n纵向滚动</text>
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</view>
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<view>
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<scroll-view :scroll-top="scrollTop" scroll-y="true" class="scroll-Y" @scrolltoupper="upper"
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@scrolltolower="lower" @scroll="scroll">
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<view id="demo1" class="scroll-view-item uni-bg-red">A</view>
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<view id="demo2" class="scroll-view-item uni-bg-green">B</view>
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<view id="demo3" class="scroll-view-item uni-bg-blue">C</view>
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</scroll-view>
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</view>
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<view @tap="goTop" class="uni-link uni-center uni-common-mt">
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点击这里返回顶部
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</view>
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<view class="uni-title uni-common-mt">
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Horizontal Scroll
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<text>\n横向滚动</text>
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</view>
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<view>
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<scroll-view class="scroll-view_H" scroll-x="true" @scroll="scroll" scroll-left="120">
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<view id="demo1" class="scroll-view-item_H uni-bg-red">A</view>
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<view id="demo2" class="scroll-view-item_H uni-bg-green">B</view>
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<view id="demo3" class="scroll-view-item_H uni-bg-blue">C</view>
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</scroll-view>
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</view>
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<view class="uni-common-pb"></view>
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</view>
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</view>
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</template>
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```
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### Example (Example 2)
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```vue
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<!-- 本示例未包含完整css，获取外链css请参考上文，在hello uni-app项目中查看 -->
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<template>
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<view>
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<view class="uni-padding-wrap uni-common-mt">
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<view class="uni-title uni-common-mt">
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Vertical Scroll
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<text>\n纵向滚动</text>
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</view>
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<view>
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<scroll-view :scroll-top="scrollTop" scroll-y="true" class="scroll-Y" @scrolltoupper="upper"
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@scrolltolower="lower" @scroll="scroll">
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<view id="demo1" class="scroll-view-item uni-bg-red">A</view>
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<view id="demo2" class="scroll-view-item uni-bg-green">B</view>
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<view id="demo3" class="scroll-view-item uni-bg-blue">C</view>
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</scroll-view>
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</view>
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<view @tap="goTop" class="uni-link uni-center uni-common-mt">
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点击这里返回顶部
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</view>
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<view class="uni-title uni-common-mt">
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Horizontal Scroll
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<text>\n横向滚动</text>
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</view>
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<view>
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<scroll-view class="scroll-view_H" scroll-x="true" @scroll="scroll" scroll-left="120">
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<view id="demo1" class="scroll-view-item_H uni-bg-red">A</view>
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<view id="demo2" class="scroll-view-item_H uni-bg-green">B</view>
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<view id="demo3" class="scroll-view-item_H uni-bg-blue">C</view>
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</scroll-view>
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</view>
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<view class="uni-common-pb"></view>
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</view>
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</view>
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</template>
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```
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### Example (Example 3)
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```vue
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<script>
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export default {
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data() {
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return {
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scrollTop: 0,
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old: {
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scrollTop: 0
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}
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}
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},
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methods: {
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upper: function(e) {
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console.log(e)
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},
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lower: function(e) {
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console.log(e)
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},
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scroll: function(e) {
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console.log(e)
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this.old.scrollTop = e.detail.scrollTop
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},
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goTop: function(e) {
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// 解决view层不同步的问题
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this.scrollTop = this.old.scrollTop
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this.$nextTick(function() {
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this.scrollTop = 0
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});
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uni.showToast({
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icon: "none",
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title: "纵向滚动 scrollTop 值已被修改为 0"
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})
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}
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}
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}
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</script>
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```
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### Example (Example 4)
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```vue
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<style>
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.scroll-Y {
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height: 300rpx;
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}
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.scroll-view_H {
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white-space: nowrap;
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width: 100%;
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}
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.scroll-view-item {
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height: 300rpx;
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line-height: 300rpx;
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text-align: center;
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font-size: 36rpx;
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}
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.scroll-view-item_H {
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display: inline-block;
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width: 100%;
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height: 300rpx;
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line-height: 300rpx;
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text-align: center;
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font-size: 36rpx;
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}
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</style>
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```
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### Example (Example 5)
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```vue
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<template>
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<view>
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<scroll-view style="height: 300px;" scroll-y="true" refresher-enabled="true" :refresher-triggered="triggered"
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:refresher-threshold="100" refresher-background="lightgreen" @refresherpulling="onPulling"
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@refresherrefresh="onRefresh" @refresherrestore="onRestore" @refresherabort="onAbort"></scroll-view>
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</view>
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</template>
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```
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### Example (Example 6)
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```vue
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<template>
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<view>
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<scroll-view style="height: 300px;" scroll-y="true" refresher-enabled="true" :refresher-triggered="triggered"
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:refresher-threshold="100" refresher-background="lightgreen" @refresherpulling="onPulling"
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@refresherrefresh="onRefresh" @refresherrestore="onRestore" @refresherabort="onAbort"></scroll-view>
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</view>
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</template>
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```
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Reference: [Official Documentation](https://uniapp.dcloud.net.cn/component/scroll-view.html)
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