ZacharyZhang-NYandClaude Opus 5.5
bcce34cda1
MyGo v0.5.5 returns ui.Element as a checked value handle instead of a
pointer. Migrated with `mygo migrate-ui`, then fixed what the codemod
leaves to review:
- Element nil checks become .Valid(); absent elements are ui.Element{}.
- Input handlers and paint callbacks run outside the build pass, where
elements expire and Context methods are inert: read IsDisabled into a
local during the build, keep a ui.Handle for Focus, use c.Services()
for clipboard access, create ui.Local state during the build.
- Add core.AutoFocus: v0.5.5 records an overlay's opener after its
content builds, so same-frame autofocus lost focus restore on close.
It focuses one frame later; cascader rows defer their focus likewise.
- core.OverlayLayer identifies build passes by the root element, not
c.Now(), which repeats across passes and under the Tester clock.
- Context menus survive the opening press counted as PressedOutside;
split button tooltip no longer reorders its open menu; disabled
menubar rows pass presses to the panel; Form defers blur-started
async checks so the growing message no longer moves Submit away
from the release; Combobox drops its disabled copy now that MyGo
blocks typing under a disabled wrapper (canary flipped to a guard).
- The Tester clock is virtual: tests use Advance/Now instead of
time.Sleep/time.Now and read element state inside the view. The web
mirror advances the clock to wall time before each frame and input.
- AGENTS.md and docs describe the value Element API and the new pin.
Snapshot goldens are darwin-only and were not re-verified here.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
# 031 Switch · 开关
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## 用途
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表示立即生效的开/关设置，如“自动备份”。组件只翻转值并回传结果，不调用任何业务接口；调用方在 `Changed()` 时执行操作，可用 `Loading` 表示“正在应用”。
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## 最小示例
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```go
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wifi := true
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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if input.Switch(c, &wifi, "Wi-Fi", input.SwitchOptions{}).Changed() {
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log.Println("Wi-Fi:", wifi)
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}
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}
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ui.Render(view, 400, 300, 1)
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```
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## 参数
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`func Switch(c *ui.Context, on *bool, label string, opts SwitchOptions) ui.Element`。`label` 为空时请在返回值上调用 `Label` 命名。
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| `Disabled` | `bool` | false | 禁用：不响应点击与键盘，退出 Tab 序列，由 MyGo 置灰。 |
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| `Loading` | `bool` | false | 调用方正在应用结果：滑块内显示旋转标记，保留尺寸与标签，暂不接受输入。 |
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| `Description` | `string` | "" | 辅助说明，屏幕阅读器在标签后读出。 |
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## 状态
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关（象牙底、褐色方块滑块）、开（酒红轨道、象牙滑块，并在左侧显示竖线标记，不只依赖颜色）、悬停（边框与底色加深）、聚焦（轨道外 2 DIP 焦点环）、禁用、加载。切换动画 120 ms，减少动画模式下直接切换。
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## 事件
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`Changed()` 在用户切换的那一帧返回 true，`*on` 已是新值。若业务失败，调用方自行把值改回并提示错误。
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## 键盘操作
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- Tab / Shift+Tab：聚焦或离开。
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- Space：切换。
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## 限制
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- 基于 `ui.SwitchBase`，无障碍角色为 Switch，开关状态由 MyGo 报告。
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- 组件不保存“请求中”状态；`Loading` 由调用方根据自己的异步任务设置。
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