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>
1.7 KiB
1.7 KiB
021 Button 按钮
用途
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。
最小示例
if input.Button(c, "Save", input.ButtonOptions{Icon: icons.Must("check")}).Clicked() {
fmt.Println("saved")
}
签名：func Button(c *ui.Context, label string, opts ButtonOptions) ui.Element
参数
| 字段 | 类型 | 默认值 | 含义 |
|---|---|---|---|
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。 |
Variant |
ButtonVariant |
Primary |
Primary、Secondary、Outline、Ghost、Danger。 |
Icon |
*ui.SVG |
nil |
文字前的 16 DIP 图标。 |
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。 |
Disabled |
bool |
false |
不可点击、不进入 Tab 序列。 |
Label |
string |
"" |
无障碍名称；label 为空时必填。 |
状态
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）。
事件
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。
键盘操作
Tab / Shift+Tab 聚焦；Enter 或 Space 触发。
限制
- 加载标记在减少动画模式下静止显示。
- 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。