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>
43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
# 022 IconButton 图标按钮
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## 用途
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只显示图标的方形按钮，用于工具栏与紧凑操作。操作名称必填，供辅助技术朗读，并作为默认提示文字。建立在 Button 之上。
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## 最小示例
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```go
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if input.IconButton(c, icons.Must("settings"), "Settings", input.IconButtonOptions{Variant: input.Ghost}).Clicked() {
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fmt.Println("open settings")
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}
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```
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签名：`func IconButton(c *ui.Context, icon *ui.SVG, label string, opts IconButtonOptions) 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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| `icon` | `*ui.SVG` | 必填 | 图标；为 nil 时 panic。 |
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| `label` | `string` | 必填 | 操作名称；为空时 panic。 |
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| `Variant` | `ButtonVariant` | `Primary` | 与 Button 相同的五种变体；工具栏通常用 `Ghost`。 |
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| `Tooltip` | `string` | 操作名称 | 悬停约 600 毫秒后显示的提示。 |
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| `Loading` | `bool` | `false` | 显示加载标记并阻止点击。 |
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| `Disabled` | `bool` | `false` | 禁用。 |
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## 状态
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同 Button：悬停、按下、聚焦、加载、禁用。边长等于当前密度的控件高度，不小于 28 DIP。
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## 事件
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`Clicked()`，一次操作一次。
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## 键盘操作
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Tab 聚焦；Enter 或 Space 触发。
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## 限制
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- 禁用时不显示提示：MyGo 的 `Hovered` 对禁用元素返回 false，提示随之不出现；名称仍作为无障碍描述保留。
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