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>
54 lines
2.4 KiB
Markdown
54 lines
2.4 KiB
Markdown
# 019 Link 链接
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## 用途
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带下划线的链接文本：打开外部地址、在 MyGo Router 中跳转路径，或作为应用内动作。可以显示打开失败的反馈。
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## 最小示例
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```go
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details := false
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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display.Link(c, "Read the charter", display.LinkOptions{URL: "https://example.com/charter"})
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if display.Link(c, "Show details", display.LinkOptions{}).Clicked() {
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details = !details
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}
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}
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```
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## 参数
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`func Link(c *ui.Context, label string, opts LinkOptions) ui.Element`
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`label` 必填，空字符串 panic。
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| `URL` | `string` | `""` | 有协议的地址用系统默认应用打开。没有协议的路径（如 `/notes/42`、`?tab=info`）在 MyGo Router 中跳转。为空时是应用内动作。 |
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| `Error` | `string` | `""` | 调用方提供的打开失败说明，显示在链接下方，也报告给辅助技术。 |
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## 状态
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- 默认：`AccentText` 颜色，始终带 1 DIP 下划线。外部地址后面带“外部链接”小图标。
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- 悬停 / 按下：文字与下划线变为 `Text` 颜色，布局不变。
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- 聚焦：2 DIP 焦点环。
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- 错误：格式不正确的地址（无法解析，或 http/https 缺少主机名）不会打开，下方显示“无法打开此链接：地址”；`Error` 非空时优先显示 `Error`。
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## 事件
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- `Clicked()`：每次点击或按 Enter 都会报告，无论是否打开了地址。同时记录 `slog.Debug("mujica: link activate")`。
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## 键盘操作
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| 按键 | 作用 |
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| --- | --- |
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| Tab | 聚焦链接 |
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| Enter | 激活 |
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## 限制
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- MyGo v0.2.10 不报告打开失败。`ui.Link` 和 `Context.OpenURL` 不返回结果（`ui/context.go:270`、`ui/window.go:583`）。窗口宿主在 goroutine 中调用 `Shell.OpenExternal` 并丢弃它的错误（`content.go:55`）。因此组件只能自行检查地址格式，系统打开失败无法自动显示。需要这种反馈时，传空 `URL`，在 `Clicked()` 后由调用方在 goroutine 中调用 `mygo.Shell.OpenExternal(url)`。它会返回 error，把结果通过 `Window.Update` 写回 `Error`。
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- 路径是否交给 Router 由 MyGo 决定。没有 Router 时，路径会被当作 URL 交给系统打开。
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- 链接不能嵌入 `ui.RichText` 句子中作为行内元素，因为外部图标和错误说明需要额外的行布局。行内链接请直接使用 `ui.Link`。
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