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>
53 lines
2.6 KiB
Markdown
53 lines
2.6 KiB
Markdown
# 090 Overlay 覆盖层
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## 用途
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在窗口内显示一层自定义内容：九个位置、可选遮罩、模态或非模态。模态时复用 MyGo `DialogBase` 的焦点限制与背景屏蔽，可与 MyGo 自带的 Select、Popover、菜单嵌套使用。
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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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overlay.Overlay(c, &open, overlay.OverlayOptions{Place: overlay.OverlayBottomRight, Label: "Now playing"}, func() {
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ui.Text(c, "Symbol I: △")
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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 Overlay(c *ui.Context, open *bool, opts OverlayOptions, content func()) 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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| `Place` | `OverlayPlace` | `OverlayCenter` | `OverlayCenter`、`Top`、`Bottom`、`Left`、`Right`、`TopLeft`、`TopRight`、`BottomLeft`、`BottomRight`；越界 panic。 |
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| `Inset` | `float32` | 16 | 面板与窗口边缘的距离。 |
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| `Modal` | `bool` | `false` | 限制焦点、屏蔽背景，点击背景关闭。 |
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| `Dim` | `bool` | `false` | 模态时加暗色遮罩；未开 `Modal` 时 panic。 |
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| `Label` | `string` | `""` | 覆盖层的无障碍名称。 |
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## 状态
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弹层外观（Surface 底、1 DIP 边框、6 DIP 圆角）与 160 ms 淡入；减少动画时直接显示。面板不超过窗口减去 `Inset`，内容超出时滚动。
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## 事件
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Escape 与（模态时）背景点击把 `*open` 设为 false。
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## 键盘操作
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| 按键 | 行为 |
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| --- | --- |
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| Escape | 关闭；先交给编辑中的控件和更上层浮层。 |
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| Tab | 模态时在覆盖层内循环；非模态时覆盖层元素排在窗口焦点顺序末尾。 |
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## 限制
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- 输入法组合期间按 Escape 仍会关闭浮层：MyGo 没有公开组合状态（`ui/editor.go:73` 的 `compose` 未导出，组合事件不交给带编辑器元素的 `HandleInput`，`ui/input.go:689`），编辑器也不接收 Escape（`ui/editor.go:163`），macOS 上按键先于输入法送达应用（`internal/darwin/surface.go:704`）。
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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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- 关闭后焦点优先由 MyGo 还给打开者；打开者已消失、焦点落空时，焦点停在组件调用处的不可见占位元素上，Tab 从这里继续。不能回到打开者的父级：MyGo 不公开当前焦点或打开者（`ui/scope.go:123`、`ui/scope.go:137`）。
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- 非模态面板首帧尚未测量尺寸，该帧透明，下一帧定位后淡入。
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