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>
46 lines
1.6 KiB
Markdown
46 lines
1.6 KiB
Markdown
# 004 Container 容器
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## 用途
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为一组内容提供内边距、最大宽度、水平居中、填充父级和裁剪，适合正文、设置页等需要可读行宽的区域。
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## 最小示例
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```go
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layout.Container(c, layout.ContainerOptions{MaxWidth: 320, Center: true}, func() {
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ui.Text(c, "A centered column of prose.")
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})
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```
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签名：`func Container(c *ui.Context, opts ContainerOptions, children func()) ui.Element`
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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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| `Padding` | `Space` | `SpaceL`（4 单位，默认密度 16 DIP） | 四周内边距，随密度缩放。 |
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| `MaxWidth` | `float32` | 0（不限） | 最大宽度 DIP；负数 panic。 |
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| `Center` | `bool` | false | 占满父级宽度后受 `MaxWidth` 限制并水平居中。 |
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| `Fill` | `bool` | false | 占满父级内容区（宽和高）。 |
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| `Clip` | `bool` | false | 裁剪超出的内容。 |
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| `children` | `func()` | 必填 | 子内容，纵向排列；nil 时 panic。 |
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`Space` 取值：`SpaceDefault`（组件默认）、`SpaceNone`、`SpaceXS`（1 单位）、`SpaceS`（2）、`SpaceM`（3）、`SpaceL`（4）、`SpaceXL`（6）、`SpaceXXL`（8）。单位为 Compact 3、Default 4、Comfortable 5 DIP。非法值 panic。
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## 状态
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布局组件，无交互状态。不绘制背景，可在返回的元素上调用 `Background`、`Border`。
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## 事件
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无。
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## 键盘操作
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不获取焦点。
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## 限制
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- 只做水平居中；垂直居中请用 `Stack` 的对齐或 MyGo `Center()`。
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- 子内容固定纵向排列，需要横向时在内部放 `Stack`。
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