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>
2.6 KiB
2.6 KiB
090 Overlay 覆盖层
用途
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。
最小示例
open := true
view := func(c *ui.Context) {
core.Use(c, core.Settings{})
overlay.Overlay(c, &open, overlay.OverlayOptions{Place: overlay.OverlayBottomRight, Label: "Now playing"}, func() {
ui.Text(c, "Symbol I: △")
})
}
ui.Render(view, 400, 300, 1)
签名：func Overlay(c *ui.Context, open *bool, opts OverlayOptions, content func()) ui.Element。
参数
| 字段 | 类型 | 默认值 | 含义 |
|---|---|---|---|
Place |
OverlayPlace |
OverlayCenter |
OverlayCenter、Top、Bottom、Left、Right、TopLeft、TopRight、BottomLeft、BottomRight；越界 panic。 |
Inset |
float32 |
16 | 面板与窗口边缘的距离。 |
Modal |
bool |
false |
限制焦点、屏蔽背景，点击背景关闭。 |
Dim |
bool |
false |
模态时加暗色遮罩；未开 Modal 时 panic。 |
Label |
string |
"" |
覆盖层的无障碍名称。 |
状态
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。
事件
Escape 与（模态时）背景点击把 *open 设为 false。
键盘操作
| 按键 | 行为 |
|---|---|
| Escape | 关闭；先交给编辑中的控件和更上层浮层。 |
| 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。 |
限制
- 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）。 - 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。 - 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）。 - 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。