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>
42 lines
1.1 KiB
Markdown
42 lines
1.1 KiB
Markdown
# 499 QRCode 二维码
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## 用途
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在本地用 Go 编码文字为二维码（字节模式，版本 1–40，纠错 L/M/Q/H），不访问网络。
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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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input.QRCode(c, "https://example.com/mujica", input.QRCodeOptions{Level: input.QRQuartile})
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}
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```
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签名：`func QRCode(c *ui.Context, text string, opts QRCodeOptions) 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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| `text` | `string` | 必填 | 按 UTF-8 字节编码。 |
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| `Level` | `QRLevel` | `QRMedium` | `QRLow`、`QRMedium`、`QRQuartile`、`QRHigh`；未知值 panic。 |
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| `Size` | `float32` | 160 | 含静区的边长；负数或非有限 panic。 |
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| `Label` | `string` | “QR code” | 无障碍名称。 |
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## 状态
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始终深色模块印在浅色底上，深色主题也一样，以便扫码；模块对齐设备像素。文字过长时显示错误。
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## 事件
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无。另有 `EncodeQR(data, level) (QRMatrix, error)` 供调用方导出。
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## 键盘操作
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不可聚焦。
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## 限制
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只用字节模式；只在文字或纠错级别变化时重新编码。
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