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>
56 lines
2.0 KiB
Markdown
56 lines
2.0 KiB
Markdown
# 084 Popover 弹出框
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## 用途
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在锚点下方显示可交互的面板；空间不足时翻到上方，并保持在窗口内。外部点击与 Escape 关闭。
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## 最小示例
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```go
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open := true
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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, "Guests", input.ButtonOptions{Variant: input.Secondary})
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if b.Clicked() {
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open = !open
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}
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overlay.Popover(c, b, &open, overlay.PopoverOptions{Title: "Guest list"}, func() {
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ui.Text(c, "Twelve guests confirmed.")
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})
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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 Popover(c *ui.Context, anchor ui.Element, open *bool, opts PopoverOptions, content func()) ui.Element`。`anchor` 必须是本帧已构建的元素，nil 时 panic。
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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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| `Title` | `string` | `""` | 面板顶部的衬线标题，同时命名面板。 |
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| `Width` | `float32` | 0 | 固定宽度；0 时随内容，至少与锚点同宽，最多 360。 |
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| `Label` | `string` | `""` | 无标题时的无障碍名称。 |
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## 状态
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- 6 DIP 圆角、Surface 底色、1 DIP 边框、160 ms 淡入。
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- 面板最高为锚点上下较大一侧的空间，超出时滚动。
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- 锚点首帧尚未布局时面板保持透明，避免闪到窗口左上角。
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## 事件
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外部点击与 Escape 把 `*open` 设为 false；内容内控件自行报告事件。
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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 | 从锚点进入弹层，弹层元素紧跟锚点排序。 |
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| Escape | 关闭并把焦点还给锚点。 |
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## 限制
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- 打开期间外部点击只用于关闭，不传给下方控件：`PopoverBase` 用覆盖整窗的背板接收点击（`ui/base.go:373`）。
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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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- 只支持下方与上方两个位置（`ui/widgets.go:689` keepInWindow）；宽度不超过窗口，过高时内容滚动。
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