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>
52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
# 029 Checkbox 复选框
|
||
|
||
## 用途
|
||
|
||
切换布尔值，支持选中、未选、半选；点击方框或标签都会切换。`CheckboxGroup` 提供组内全选（对应 MyGo CheckboxGroup）。基于 `ui.CheckboxBase`。
|
||
|
||
## 最小示例
|
||
|
||
```go
|
||
input.CheckboxGroup(c, "Notifications", []input.CheckboxItem{
|
||
{Label: "Mail", Value: &mail},
|
||
{Label: "Calendar", Value: &calendar},
|
||
}, input.CheckboxGroupOptions{})
|
||
```
|
||
|
||
签名：
|
||
|
||
```go
|
||
func Checkbox(c *ui.Context, value *bool, label string, opts CheckboxOptions) ui.Element
|
||
func CheckboxGroup(c *ui.Context, label string, items []CheckboxItem, opts CheckboxGroupOptions) ChoiceResult
|
||
```
|
||
|
||
## 参数
|
||
|
||
`CheckboxOptions`
|
||
|
||
| 字段 | 类型 | 默认值 | 含义 |
|
||
| --- | --- | --- | --- |
|
||
| `Indeterminate` | `bool` | `false` | 显示半选横线；此时点击总是变为选中。是否半选由调用方决定。 |
|
||
| `Disabled` | `bool` | `false` | 禁用。 |
|
||
|
||
`CheckboxItem`：`Label string`、`Value *bool`（必填）、`Disabled bool`。`CheckboxGroupOptions`：`Disabled bool`。`items` 为空时 panic。
|
||
|
||
## 状态
|
||
|
||
未选（Surface 底、ControlBorder 边）、悬停与按下（AccentText 边）、选中（酒红底、象牙白勾；悬停与按下时底色加深、边框变为正文色）、半选（酒红底、象牙白横线）、键盘聚焦（方框外焦点环）、禁用。行高不低于密度控件高度。
|
||
|
||
全选框：全部选中为选中，部分选中为半选，全不选为未选。点击时若可用项未全选则全部勾选，否则全部清除；禁用项保持不变。
|
||
|
||
## 事件
|
||
|
||
- `Checkbox(...).Changed()`：用户切换了值。
|
||
- `CheckboxGroup(...).Changed()`：全选或任一项被切换。
|
||
|
||
## 键盘操作
|
||
|
||
Tab 聚焦（每个复选框一个停靠点）；Space 切换。
|
||
|
||
## 限制
|
||
|
||
- MyGo 只有内部字段能把复选框报告为“mixed”（`access.go:307`，`checked` 未导出）。半选时组件在无障碍描述中加入“部分选中”，但角色状态仍报告为未选中。
|