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>
2.0 KiB
2.0 KiB
084 Popover 弹出框
用途
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。
最小示例
open := true
view := func(c *ui.Context) {
core.Use(c, core.Settings{})
b := input.Button(c, "Guests", input.ButtonOptions{Variant: input.Secondary})
if b.Clicked() {
open = !open
}
overlay.Popover(c, b, &open, overlay.PopoverOptions{Title: "Guest list"}, func() {
ui.Text(c, "Twelve guests confirmed.")
})
}
ui.Render(view, 400, 300, 1)
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。
参数
| 字段 | 类型 | 默认值 | 含义 |
|---|---|---|---|
Title |
string |
"" |
面板顶部的衬线标题，同时命名面板。 |
Width |
float32 |
0 | 固定宽度；0 时随内容，至少与锚点同宽，最多 360。 |
Label |
string |
"" |
无标题时的无障碍名称。 |
状态
- 6 DIP 圆角、Surface 底色、1 DIP 边框、160 ms 淡入。
- 面板最高为锚点上下较大一侧的空间，超出时滚动。
- 锚点首帧尚未布局时面板保持透明，避免闪到窗口左上角。
事件
外部点击与 Escape 把 *open 设为 false；内容内控件自行报告事件。
键盘操作
| 按键 | 行为 |
|---|---|
| Tab | 从锚点进入弹层，弹层元素紧跟锚点排序。 |
| Escape | 关闭并把焦点还给锚点。 |
限制
- 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）。 - 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。 - 只支持下方与上方两个位置（
ui/widgets.go:689keepInWindow）；宽度不超过窗口，过高时内容滚动。