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>
49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
# 005 Stack 堆叠
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## 用途
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按横向或纵向排列子元素，统一间距、对齐与换行。要隐藏子项就不构建它（`if !hidden { build() }`），未构建的子项不占位置也不留间距。
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## 最小示例
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```go
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layout.Stack(c, layout.StackOptions{Horizontal: true, Gap: layout.SpaceM}, func() {
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input.Button(c, "Save", input.ButtonOptions{})
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if showDraft {
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input.Button(c, "Draft", input.ButtonOptions{Variant: input.Secondary})
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}
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input.Button(c, "Cancel", input.ButtonOptions{Variant: input.Ghost})
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})
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```
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签名：
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- `func Stack(c *ui.Context, opts StackOptions, 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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| `Horizontal` | `bool` | false | 横向排列；否则纵向。 |
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| `Gap` | `Space` | `SpaceS`（2 单位） | 子项间距，随密度缩放。 |
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| `Align` | `StackAlign` | `StackAlignAuto` | 交叉轴对齐：Auto（纵向拉伸、横向居中）、Start、Center、End、Stretch；非法值 panic。 |
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| `Justify` | `ui.Align` | `ui.Start` | 主轴分布：Start、Center、End、SpaceBetween、SpaceAround、SpaceEvenly。 |
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| `Wrap` | `bool` | false | 横向换行；纵向时设置会 panic。 |
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## 状态
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布局组件，无交互状态。
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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；Tab 顺序即子项构建顺序。
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## 限制
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- 隐藏项不会被构建，其内部界面状态（如未提交的输入）随之丢弃；需要保留时把状态放在应用中。
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- 只有横向支持换行。
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