fix(pickerview): 解决小程序获取高度计算错误

[irisSong]

…rview

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

💡 需求背景和解决方案

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⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
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Summary by CodeRabbit

• 新功能
  • 更新了组件高度计算逻辑，新增了一个占位视图，现在可以根据元素实际尺寸动态调整高度，同时实现了动态标识。
• 样式
  • 为新增的占位视图整合了专属样式，使其与整体界面风格保持一致。

[coderabbitai]

Walkthrough

这次修改主要更新了组件的高度计算逻辑和样式定义。在 pickerroller.taro.tsx 中，引入了新的引用 placeholderRef 来替代原有的 rollerRef，进而计算占位元素的高度，并更新了 useEffect 的依赖。同时，组件的返回输出中增加了一个带动态 ID 的 View 元素。而在 pickerview.scss 中，新添加了嵌套类 &-placeholder，设置其高度为 $picker-item-height。

Changes

文件	变更摘要
src/.../pickerroller.taro.tsx	新增 placeholderRef 替换 rollerRef；更新 useEffect 依赖；新增带动态 ID 的 View 元素。
src/.../pickerview.scss	新增嵌套类 &-placeholder，设置高度为 $picker-item-height。

Sequence Diagram(s)

sequenceDiagram
    participant C as 组件
    participant E as useEffect
    participant P as placeholderRef
    participant G as getRectByTaro

    C->>E: 组件挂载
    E->>P: 获取 placeholder 元素
    E->>G: 调用 getRectByTaro(placeholderRef.current)
    G-->>E: 返回元素高度
    E->>C: 应用高度计算结果

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Suggested reviewers

• xiaoyatong
• oasis-cloud

Poem

我是一只快乐的小兔，
在代码森林中轻快穿行；
placeholderRef 为我指引新径，
SCSS 的草坪铺就高度清新。
变更之风，轻拂编程世界，喜悦洒满每一行！

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 384bca0 and 17a3376.

📒 Files selected for processing (2)

• src/packages/pickerview/pickerroller.taro.tsx (4 hunks)
• src/packages/pickerview/pickerview.scss (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: test

🔇 Additional comments (5)

src/packages/pickerview/pickerview.scss (1)

52-54: 添加占位元素样式，确保高度一致性

新增的 &-placeholder 类将占位元素的高度设置为与 picker 项目相同，保证了计算高度时的一致性和准确性。这是解决小程序高度计算问题的关键部分。

src/packages/pickerview/pickerroller.taro.tsx (4)

47-47: 添加新的引用用于高度计算

添加了 placeholderRef 引用，用于后续获取占位元素的高度，这是修复小程序高度计算错误的基础。

---

161-161: 更新高度获取逻辑，使用占位元素

将高度获取方法从使用 rollerRef 改为使用 placeholderRef，这样可以更准确地获取固定高度的占位元素尺寸，避免了之前计算错误的问题。

---

191-191: 更新依赖数组，确保高度变化时重新计算

在 useEffect 的依赖数组中添加 placeholderRef.current，确保当占位元素变化时能重新计算高度，增强了代码的响应性。

---

250-254: 添加占位元素，提供稳定的高度参考

添加了带有唯一ID和类名的占位元素 View，并绑定了 placeholderRef。这个元素的高度是固定的，为小程序环境下的高度计算提供了稳定可靠的参考点，有效解决了原有的高度计算错误问题。

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.95%. Comparing base (384bca0) to head (17a3376).
Report is 3 commits behind head on feat_v3.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           feat_v3.x    #3120   +/-   ##
==========================================
  Coverage      86.95%   86.95%           
==========================================
  Files            280      280           
  Lines          18456    18456           
  Branches        2785     2786    +1     
==========================================
  Hits           16049    16049           
  Misses          2402     2402           
  Partials           5        5           

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