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>
1.9 KiB
1.9 KiB
042 FormField
表单字段。
用途
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。
最小示例
email := ""
view := func(c *ui.Context) {
core.Use(c, core.Settings{})
input.FormField(c, "Email", input.FormFieldOptions{Required: true, Description: "For receipts."}, func() ui.Element {
return input.InputGroup(c, &email, input.InputGroupOptions{}).Input
})
}
ui.Render(view, 400, 300, 1)
参数
| 字段 | 类型 | 默认值 | 含义 |
|---|---|---|---|
label |
string |
必填 | 标签文字；空值 panic。 |
FormFieldOptions.Required |
bool |
false | 在标签后显示危险色“*”，并向辅助技术说明“必填”。 |
FormFieldOptions.Description |
string |
"" | 控件下方的说明。 |
FormFieldOptions.Error |
string |
"" | 控件下方的错误，并把控件标记为无效。 |
FormFieldOptions.Horizontal |
bool |
false | 标签在左、控件在右。 |
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。 |
状态
默认、必填、带说明、错误；禁用由控件自身决定，标签随之变淡。
事件
无自身事件；事件来自内部控件。
键盘操作
Tab 直接到达控件；点击标签聚焦控件，或切换复选框、开关。
限制
- control 返回的元素的 Label 会被字段标签覆盖。
- Error 只把元素标记为无效；InputGroup 等的红色边框需同时传入
Invalid: true。 - 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。