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>
1.7 KiB
1.7 KiB
013 Icon 图标
用途
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。
最小示例
view := func(c *ui.Context) {
core.Use(c, core.Settings{})
ui.Row(c).Gap(8).Children(func() {
display.Icon(c, "star", display.IconOptions{})
display.Icon(c, "circle-check", display.IconOptions{Size: 20, Tone: display.IconSuccess, Label: "Done"})
})
}
参数
func Icon(c *ui.Context, name string, opts IconOptions) ui.Element
name 必填，空字符串 panic。可用名称见 icons.Names()。
| 字段 | 类型 | 默认值 | 含义 |
|---|---|---|---|
Size |
float32 |
0（即 16） |
宽高（DIP），建议 16、20、24。负数 panic。 |
Tone |
IconTone |
IconInherit |
IconInherit 沿用文字颜色；另有 IconMuted、IconAccent、IconSuccess、IconWarning、IconDanger、IconInfo。未知值 panic。 |
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。 |
状态
- 默认：按语义颜色显示图标。
- 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", ...)。
事件
无。
键盘操作
不获取焦点。
限制
- 只能使用
icons包内置的图标。要显示任意 SVG，可直接用ui.Icon。 - 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。