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>
48 lines
1.2 KiB
Markdown
48 lines
1.2 KiB
Markdown
# 496 Masonry 瀑布流
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## 用途
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按可用宽度决定列数，把每一项放进当前最短的列；只构建可见范围内的项，以稳定键记住测得的高度。
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## 最小示例
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```go
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titles := []string{"Sea", "Forest", "Desert", "Glacier"}
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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input.Masonry(c, len(titles), input.MasonryOptions{
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Key: func(i int) string { return titles[i] },
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}, func(i int) {
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ui.Text(c, titles[i])
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}).Size(380, 280)
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}
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```
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签名：`func Masonry(c *ui.Context, n int, opts MasonryOptions, item func(i int)) 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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| `n` | `int` | 必填 | 项数；负数 panic。 |
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| `Key` | `func(int) string` | 必填 | 稳定且唯一的键；重复 panic。 |
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| `ColumnWidth` | `float32` | 220 | 最窄列宽。 |
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| `Gap` | `float32` | 3 个间距单位 | 间隔。 |
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| `Estimate` | `float32` | 160 | 测量前的估计高度。 |
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## 状态
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自身是滚动容器，需由调用方给定尺寸。
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## 事件
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无。
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## 键盘操作
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滚动容器按 MyGo 规则滚动；项内控件按各自规则聚焦。
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## 限制
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排布只在项数、列数、宽度、测得高度或可见项的键变化时重算。
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