feat(TCascader): 对齐级联面板与公开示例 - #1060
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…ader-demo-alignment # Conflicts: # .cnb/.reusable-stages.yml # .github/workflows/test-build.yml # tdesign-component/example/test/fonts/README.md # tdesign-component/tool/check_component_coverage.dart # tdesign-component/tool/run_component_regression.dart # tdesign-component/tool/run_visual_regression.dart
…ader-demo-alignment # Conflicts: # .cnb/.reusable-stages.yml # .github/workflows/test-build.yml # tdesign-component/tool/check_component_coverage.dart # tdesign-component/tool/run_component_regression.dart # tdesign-component/tool/run_visual_regression.dart
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🤔 这个 PR 的性质是？
🔗 相关 Issue
Related to #1027
💡 需求背景和解决方案
Cascader 原组件与公开 Demo 未完整覆盖设计稿中的 step/tab、逐级副标题、任意层选择、搜索及受控提交路径，部分视觉值还可能被 Material 隐式默认主题覆盖。
TCascader保持平铺且严格受控：value是唯一外部状态源，onChanged == null时禁用；Popup、标题、搜索、草稿、取消与提交继续由调用方组合。subtitles，由组件按内部活动层级展示对应副标题，不新增层级 Controller 或第二状态源。variant的既有默认值TCascaderVariant.tab；公开基础示例显式使用 step，选项卡示例显式使用 tab。TCascaderOption，查看代码展示真实的TCell + TPopup + TCascader受控组合及各实例差异配置。TSearchBar仅在内部TextField边界提供透明 Material 上下文；TPopup相对 develop 无源码差异，不影响 Popup、ActionSheet、Picker、Calendar 的结构和主题。specs/024-cascader-demo-alignment/spec.md验证：Flutter 3.32.0 / latest 严格 analyze、组件与 Demo 回归、APK/iOS/Web 构建全部通过；Flutter 3.32.0 Linux visual regression 通过；Cascader 生产代码覆盖率
248/251 = 98.80%，Search 生产代码覆盖率193/197 = 97.97%；示例代码生成检查无漂移。📝 更新日志
feat(TCascader): 支持按活动层级展示次级标题，并完善 step/tab、任意层选择和搜索组合示例。
fix(TCascader): 修正层级面板的交互、尺寸与主题回退，避免 Material 隐式默认样式覆盖 TDesign 视觉。
本条 PR 不需要纳入 Changelog
☑️ 请求合并前的自查清单
type(<scope>?): 修改描述。示例：
fix(TBottomTabBar): 修复 iconText 模式底部溢出