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
1.7 KiB
Markdown
48 lines
1.7 KiB
Markdown
# 013 Icon 图标
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## 用途
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按名称显示 `icons` 包内置的 Lucide SVG 图标，可设尺寸与语义颜色。名称不存在时显示可见的回退标记并写警告日志。
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## 最小示例
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```go
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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ui.Row(c).Gap(8).Children(func() {
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display.Icon(c, "star", display.IconOptions{})
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display.Icon(c, "circle-check", display.IconOptions{Size: 20, Tone: display.IconSuccess, Label: "Done"})
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})
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}
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```
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## 参数
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`func Icon(c *ui.Context, name string, opts IconOptions) ui.Element`
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`name` 必填，空字符串 panic。可用名称见 `icons.Names()`。
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| `Size` | `float32` | `0`（即 16） | 宽高（DIP），建议 16、20、24。负数 panic。 |
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| `Tone` | `IconTone` | `IconInherit` | `IconInherit` 沿用文字颜色；另有 `IconMuted`、`IconAccent`、`IconSuccess`、`IconWarning`、`IconDanger`、`IconInfo`。未知值 panic。 |
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| `Label` | `string` | `""` | 有含义的图标的无障碍名称；为空时图标视为装饰，不进入无障碍树。 |
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## 状态
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- 默认：按语义颜色显示图标。
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- 加载失败（名称不存在）：在同尺寸方框中用 `Danger` 色绘制虚线框与斜线，提示文字为“缺少图标：名称”，无障碍名称相同。每个元素对每个缺失名称记录一次 `slog.Warn("mujica: icon missing", "name", ...)`。
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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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- 只能使用 `icons` 包内置的图标。要显示任意 SVG，可直接用 `ui.Icon`。
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- 回退标记带悬停提示，但图标本身不获取焦点，键盘用户看不到这个提示，只能依赖无障碍名称。
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