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>
1.6 KiB
1.6 KiB
004 Container 容器
用途
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。
最小示例
layout.Container(c, layout.ContainerOptions{MaxWidth: 320, Center: true}, func() {
ui.Text(c, "A centered column of prose.")
})
签名：func Container(c *ui.Context, opts ContainerOptions, children func()) ui.Element
参数
| 字段 | 类型 | 默认值 | 含义 |
|---|---|---|---|
Padding |
Space |
SpaceL（4 单位，默认密度 16 DIP） |
四周内边距，随密度缩放。 |
MaxWidth |
float32 |
0（不限） | 最大宽度 DIP；负数 panic。 |
Center |
bool |
false | 占满父级宽度后受 MaxWidth 限制并水平居中。 |
Fill |
bool |
false | 占满父级内容区（宽和高）。 |
Clip |
bool |
false | 裁剪超出的内容。 |
children |
func() |
必填 | 子内容，纵向排列；nil 时 panic。 |
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。
状态
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。
事件
无。
键盘操作
不获取焦点。
限制
- 只做水平居中；垂直居中请用
Stack的对齐或 MyGoCenter()。 - 子内容固定纵向排列，需要横向时在内部放
Stack。