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
1.7 KiB
Markdown
44 lines
1.7 KiB
Markdown
# 021 Button 按钮
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## 用途
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触发一个操作。提供主按钮、次按钮、描边、无底色和危险五种变体，可带图标，可显示加载与禁用。基于 MyGo `ui.ButtonBase`。
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## 最小示例
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```go
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if input.Button(c, "Save", input.ButtonOptions{Icon: icons.Must("check")}).Clicked() {
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fmt.Println("saved")
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}
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```
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签名：`func Button(c *ui.Context, label string, opts ButtonOptions) ui.Element`
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## 参数
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| `label` | `string` | 必填（仅图标时可为空） | 按钮文字；为空时必须提供 `Label`，否则 panic。 |
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| `Variant` | `ButtonVariant` | `Primary` | `Primary`、`Secondary`、`Outline`、`Ghost`、`Danger`。 |
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| `Icon` | `*ui.SVG` | `nil` | 文字前的 16 DIP 图标。 |
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| `Loading` | `bool` | `false` | 加载标记出现在前置 16 DIP 图标位置，文字保持可见；有图标时替换图标，纯文字时从左右内边距中让出该位置，宽度不变；阻止点击。 |
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| `Disabled` | `bool` | `false` | 不可点击、不进入 Tab 序列。 |
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| `Label` | `string` | `""` | 无障碍名称；`label` 为空时必填。 |
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## 状态
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默认、悬停（底色加深或出现浅底）、按下、键盘聚焦（2 DIP 酒红焦点环，外留 2 DIP）、加载、禁用（MyGo 统一减淡）。高度不低于当前密度的控件高度（28/36/44 DIP）。
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## 事件
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`Clicked()`：鼠标在按钮内释放、Enter 或 Space 时为真，一次操作只报告一次。加载与禁用时始终为假。
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## 键盘操作
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Tab / Shift+Tab 聚焦；Enter 或 Space 触发。
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## 限制
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- 加载标记在减少动画模式下静止显示。
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- 危险变体的悬停与按下色由 `DangerFill` 混合黑色得到，未单独定义变量。
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