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>
44 lines
1.2 KiB
Markdown
44 lines
1.2 KiB
Markdown
# 032 Toggle · 切换按钮
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## 用途
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保持按下状态的按钮，例如编辑器工具栏中的“加粗”。可显示文字、图标或二者兼有。
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## 最小示例
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```go
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bold := false
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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input.Toggle(c, &bold, "", input.ToggleOptions{Icon: icons.Must("bold"), Label: "Bold"})
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}
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ui.Render(view, 400, 300, 1)
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```
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## 参数
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`func Toggle(c *ui.Context, on *bool, label string, opts ToggleOptions) ui.Element`。`label` 与 `opts.Label` 至少提供一个，否则 panic。
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| `Icon` | `*ui.SVG` | nil | 显示在文字前的图标。 |
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| `Disabled` | `bool` | false | 禁用：不响应输入，退出 Tab 序列。 |
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| `Label` | `string` | "" | 无文字按钮的无障碍名称。 |
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## 状态
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未按下（象牙底、描边）、按下（玫瑰底、酒红边框与文字，底部 2 DIP 横条标记——选中不只依赖颜色）、悬停、按住、聚焦（2 DIP 焦点环）、禁用。
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## 事件
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`Changed()` 在用户切换的那一帧返回 true。
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## 键盘操作
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- Tab：聚焦。
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- Space：按下或松开。
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## 限制
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- 基于 `ui.ToggleBase`，无障碍角色为 ToggleButton，按下状态由 MyGo 报告。
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