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>
2.2 KiB
2.2 KiB
086 HoverCard 悬停卡片
用途
悬停或聚焦锚点时预览更多信息，例如人物资料。指针可以移入卡片并操作其中的控件，键盘可以 Tab 进入卡片，离开后延迟关闭。
最小示例
view := func(c *ui.Context) {
core.Use(c, core.Settings{})
b := input.Button(c, "Lady Sakiko", input.ButtonOptions{Variant: input.Ghost})
overlay.HoverCard(c, b, overlay.HoverCardOptions{}, func() {
ui.Text(c, "Keyboardist of the court.")
})
}
ui.Render(view, 400, 300, 1)
签名：func HoverCard(c *ui.Context, anchor ui.Element, opts HoverCardOptions, content func()) ui.Element，返回卡片，未显示时为 nil。
参数
| 字段 | 类型 | 默认值 | 含义 |
|---|---|---|---|
OpenDelay |
time.Duration |
500 ms | 悬停或聚焦多久后打开；负数 panic。 |
CloseDelay |
time.Duration |
300 ms | 指针与焦点都离开后多久关闭；负数 panic。 |
Width |
float32 |
280 | 卡片宽度。 |
Label |
string |
"" |
卡片的无障碍名称。 |
状态
- 打开、关闭都按延迟进行；减少动画时取消淡入。
- 指针在锚点或卡片上、或键盘焦点在锚点或卡片内时保持打开。
- 下方空间不足时翻到上方，左右限制在窗口内。
事件
返回值由 nil 变为非 nil 即打开；卡片内控件自行报告事件。
键盘操作
| 按键 | 行为 |
|---|---|
| Tab 聚焦锚点 | OpenDelay 后打开。 |
| Tab | 从锚点进入卡片内的控件，再继续到后面的元素。 |
| Escape | 立即关闭，焦点回到锚点，直到焦点离开前不再打开。 |
限制
- 卡片由
PopoverBase承载，使焦点顺序紧跟锚点，在 Dialog 内也属于对话框的焦点范围；代价是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）。 - 指针在卡片外但焦点仍在卡片内时卡片保持打开，点击外部或按 Escape 关闭。
- 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。