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>
47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
# 085 Tooltip 文字提示
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## 用途
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指针停留或键盘聚焦一段时间后，在元素旁显示简短说明。提示不含交互内容，不拦截指针，并作为元素的无障碍描述。
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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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b := input.Button(c, "Seal", input.ButtonOptions{})
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overlay.Tooltip(c, b, "Seal the letter with wax", overlay.TooltipOptions{})
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}
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ui.Render(view, 400, 300, 1)
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```
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签名：`func Tooltip(c *ui.Context, anchor ui.Element, text string, opts TooltipOptions) ui.Element`，返回 `anchor`。`anchor` 为 nil 时 panic；`text` 为空时什么也不做。
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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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| `Delay` | `time.Duration` | 500 ms | 悬停或键盘聚焦持续多久后显示；负数 panic。 |
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## 状态
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- 炭黑底（深色主题为象牙底）、2 DIP 圆角、12+1 DIP 文字，最宽 240 DIP 后换行。
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- 默认在元素下方居中，下方放不下时翻到上方，左右限制在窗口内。
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## 事件
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无业务事件。`text` 同时写入 `anchor` 的无障碍描述。
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## 键盘操作
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| 按键 | 行为 |
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| --- | --- |
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| Tab 聚焦 | 键盘焦点停留 `Delay` 后显示。 |
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| Escape | 隐藏，直到指针离开或焦点移走。 |
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## 限制
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- Escape 只关闭最上层的 MujicaUI 浮层（窗口内按打开顺序记录）。MyGo 自带的 `ui.Popover`、`ui.Select` 弹层不在这份记录中；它们打开在非模态 MujicaUI 浮层之上时，Escape 可能先关闭下面的 MujicaUI 浮层。
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- 只在键盘焦点（可见焦点）时显示，鼠标点击获得的焦点不触发。
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- 不使用 MyGo 的 `Element.Tooltip`：它只跟随指针、不响应焦点（`ui/widgets.go:549`）。
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