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>
50 lines
1.9 KiB
Markdown
50 lines
1.9 KiB
Markdown
# 042 FormField
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表单字段。
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## 用途
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为单个控件提供标签、必填标记、说明与错误文字。标签、说明与错误显式关联到 control 返回的元素：屏幕阅读器以标签命名该元素并读出说明、必填与错误；点击标签聚焦该元素。
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## 最小示例
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```go
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email := ""
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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input.FormField(c, "Email", input.FormFieldOptions{Required: true, Description: "For receipts."}, func() ui.Element {
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return input.InputGroup(c, &email, input.InputGroupOptions{}).Input
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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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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| `label` | `string` | 必填 | 标签文字；空值 panic。 |
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| `FormFieldOptions.Required` | `bool` | false | 在标签后显示危险色“*”，并向辅助技术说明“必填”。 |
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| `FormFieldOptions.Description` | `string` | "" | 控件下方的说明。 |
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| `FormFieldOptions.Error` | `string` | "" | 控件下方的错误，并把控件标记为无效。 |
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| `FormFieldOptions.Horizontal` | `bool` | false | 标签在左、控件在右。 |
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| `control` | `func() ui.Element` | 必填 | 构建控件并返回要关联的可聚焦元素（如 `InputGroupParts.Input`）；返回零值 `ui.Element{}` 时 panic。 |
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## 状态
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默认、必填、带说明、错误；禁用由控件自身决定，标签随之变淡。
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## 事件
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无自身事件；事件来自内部控件。
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## 键盘操作
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Tab 直接到达控件；点击标签聚焦控件，或切换复选框、开关。
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## 限制
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- control 返回的元素的 Label 会被字段标签覆盖。
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- Error 只把元素标记为无效；InputGroup 等的红色边框需同时传入 `Invalid: true`。
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- 左右布局时多个字段需放在 MujicaUI `Form(Horizontal)` 中才能对齐标签宽度；单独使用时只按自身标签宽度排列。
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