Agent Skills

skyline-scroll-api

Skyline 滚动控制 API 技能。涵盖 ScrollViewContext(程序化下拉刷新、下拉二级、滚动定位)、DraggableSheetContext(半屏面板程序化滚动)、worklet.scrollViewContext(UI 线程直接控制滚动)。适用于程序化触发刷新/二级、控制 DraggableSheet 位置、在 worklet 中操作滚动。触发关键词:ScrollViewContext、DraggableSheetContext、scrollTo、triggerRefresh、triggerTwoLevel、下拉刷新API、下拉二级API、滚动API、worklet scrollViewContext。

Install

npx skills add https://github.com/wechat-miniprogram/skyline-skills --skill skyline-scroll-api
SKILL.md

Skyline 滚动控制 API

适用场景

  • 程序化触发 scroll-view 下拉刷新或关闭刷新
  • 程序化触发/关闭下拉二级("二楼"页面)
  • 通过 ScrollViewContext 控制滚动位置和行为
  • 控制 DraggableSheet 半屏面板滚动到指定位置
  • 在 worklet 函数中(UI 线程)直接控制 scroll-view 滚动

核心概念

三大 API 族群

API 族群 获取方式 线程 最低基础库
ScrollViewContext NodesRef.node() + enhanced 属性 逻辑线程 2.14.4
DraggableSheetContext NodesRef.node() 逻辑线程 3.2.0
worklet.scrollViewContext NodesRef.ref() + SharedValue UI 线程 3.3.0

获取实例

// ScrollViewContext(需开启 enhanced)
wx.createSelectorQuery().select('#scrollview').node()
  .exec(res => { const ctx = res[0].node })

// DraggableSheetContext
wx.createSelectorQuery().select('.sheet').node()
  .exec(res => { const ctx = res[0].node })

// worklet.scrollViewContext(通过 ref)
this.scrollRef = wx.worklet.shared()
this.createSelectorQuery().select('.scrollable')
  .ref(res => { this.scrollRef.value = res.ref }).exec()

文档索引

根据需求快速定位(路径相对于 references/):

我想要... 查阅文档
查看 ScrollViewContext 全部方法和属性 api/scroll-view-context.md
了解 DraggableSheetContext.scrollTo 参数 api/draggable-sheet-context.md
在 worklet 中控制滚动 api/worklet-scroll-context.md
查看完整代码模式(刷新、二级、Sheet 控制) patterns.md

强制规则

MUST(必须遵守)

  1. scroll-view 必须开启 enhanced 属性才能获取 ScrollViewContext:

    <!-- ❌ 错误:未开启 enhanced,node() 返回的不是 ScrollViewContext -->
    <scroll-view type="list" scroll-y>
    
    <!-- ✅ 正确 -->
    <scroll-view type="list" scroll-y enhanced>
    
  2. DraggableSheetContext.scrollTo 中 size 和 pixels 同时传入时,仅 size 生效:

    // ❌ 错误:同时传入 size 和 pixels,pixels 被忽略
    sheetContext.scrollTo({ size: 0.7, pixels: 200 })
    
    // ✅ 正确:二选一
    sheetContext.scrollTo({ size: 0.7 })   // 相对位置
    sheetContext.scrollTo({ pixels: 200 }) // 绝对位置
    
  3. worklet.scrollViewContext 必须通过 NodesRef.ref 获取引用并存入 SharedValue:

    // ❌ 错误:使用 node() 而非 ref()
    this.createSelectorQuery().select('.scroll').node()
      .exec(res => { /* 这是 ScrollViewContext,不是 worklet 引用 */ })
    
    // ✅ 正确:使用 ref() + shared()
    this.scrollRef = wx.worklet.shared()
    this.createSelectorQuery().select('.scroll')
      .ref(res => { this.scrollRef.value = res.ref }).exec()
    
  4. 调用 worklet.scrollViewContext.scrollTo 的函数必须声明 'worklet' 指令:

    // ❌ 错误:缺少 worklet 指令
    onTap() {
      scrollViewContext.scrollTo(this.scrollRef.value, { top: 200 })
    }
    
    // ✅ 正确
    onTap() {
      'worklet'
      scrollViewContext.scrollTo(this.scrollRef.value, { top: 200 })
    }
    

NEVER(禁止行为)

  1. NEVER 在逻辑线程中调用 worklet.scrollViewContext.scrollTo——该 API 仅在 UI 线程(worklet 函数内)可用
  2. NEVER 在小程序插件中使用 worklet.scrollViewContext.scrollTo——该 API 不支持小程序插件

Quick Reference

ScrollViewContext 方法速查

方法 说明 最低基础库
scrollTo({ top, left, velocity, duration, animated }) 滚动至指定位置 2.14.4
scrollIntoView(selector, options?) 滚动至指定元素 2.14.4
triggerRefresh({ duration?, easingFunction? }) 触发下拉刷新 3.0.0
closeRefresh() 关闭下拉刷新 3.0.0
triggerTwoLevel({ duration?, easingFunction? }) 触发下拉二级 3.0.0
closeTwoLevel({ duration?, easingFunction? }) 关闭下拉二级 3.0.0

ScrollViewContext 属性速查

属性 类型 说明
scrollEnabled boolean 滚动开关
bounces boolean 边界弹性(仅 iOS)
showScrollbar boolean 显示滚动条
pagingEnabled boolean 分页滑动
fastDeceleration boolean 快速减速(仅 iOS)
decelerationDisabled boolean 取消滚动惯性(仅 iOS)

场景决策表

场景 推荐 API
程序化触发下拉刷新 ScrollViewContext.triggerRefresh()
数据加载完成后关闭刷新 ScrollViewContext.closeRefresh()
打开/关闭下拉二级 triggerTwoLevel() / closeTwoLevel()
滚动到指定偏移量 ScrollViewContext.scrollTo({ top })
滚动到指定元素 ScrollViewContext.scrollIntoView(selector)
控制 DraggableSheet 位置 DraggableSheetContext.scrollTo({ size })
UI 线程中控制滚动(配合手势) worklet.scrollViewContext.scrollTo()

程序化刷新最小示例

// 获取 ScrollViewContext
wx.createSelectorQuery().select('#sv').node().exec(res => {
  const ctx = res[0].node
  ctx.triggerRefresh({ duration: 300 })
  // 数据加载完成后
  setTimeout(() => ctx.closeRefresh(), 2000)
})

相关技能

场景 推荐技能 说明
scroll-view 组件属性和事件 skyline-components scroll-view/draggable-sheet 组件详解
Worklet 动画系统 skyline-worklet SharedValue、timing/spring、worklet 基础
页面转场路由 skyline-route 自定义路由、预设路由
Skyline 概览与迁移 skyline-overview 渲染引擎概览、兼容性

References 目录结构

references/
├── api/
│   ├── draggable-sheet-context.md
│   ├── scroll-view-context.md
│   └── worklet-scroll-context.md
└── patterns.md

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