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>
49 lines
1.2 KiB
Markdown
49 lines
1.2 KiB
Markdown
# 299 Presence 进出场
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## 用途
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内容随 show 进出场：淡入淡出、滑动或折叠，退出完成后移除。
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## 最小示例
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```go
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show := true
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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feedback.Presence(c, show, feedback.PresenceOptions{Kind: feedback.PresenceSlide}, func() {
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ui.Text(c, "Saved")
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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 Presence(c *ui.Context, show bool, opts PresenceOptions, content func()) ui.Element`
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## 参数
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`PresenceOptions`
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| Kind | PresenceKind | PresenceFade | PresenceFade、PresenceSlide、PresenceCollapse；未知值 panic。 |
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| Duration | time.Duration | 0（即 PopupDuration） | 时长；为负 panic。 |
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基于 MyGo `Transition` 的 Enter 与 Exit：退出时保留上一帧的副本直到动画结束，不占布局、不接收指针与焦点。
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## 状态
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- 减少动画：直接出现与消失。动画结束后停止重绘。
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## 事件
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- 无。
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## 键盘操作
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- 退出中的内容不接收焦点。
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## 限制
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- 不提供缩放：MyGo `ui.Motion` 只有位移、透明度与折叠（ui/transition.go:40）。
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- 父元素在上一帧不存在时，内容随父元素一起出现而不进场。
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