WIP essentials 16
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# 500 ActivityFeed 活动流
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## 用途
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按日分组显示“参与者 动作 对象 时间”,今天与昨天用文字,其余显示日期;只构建可见行。
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## 最小示例
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```go
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events := []mujica.Activity{
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{ID: "1", Actor: "Lin", Action: "commented on", Object: "Quarterly report", Time: time.Now()},
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}
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view := func(c *ui.Context) {
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mujica.Use(c, mujica.Settings{})
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mujica.ActivityFeed(c, events, mujica.ActivityFeedOptions{}).Size(380, 280)
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}
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```
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签名:`func ActivityFeed(c *ui.Context, items []Activity, opts ActivityFeedOptions) *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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| `items` | `[]Activity` | 必填 | ID、Actor、Action、Object、Time;缺 ID、Actor、Action 或 Time panic。 |
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| `Location` | `*time.Location` | `time.Local` | 按哪个时区划分日期。 |
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| `Today` | `Date` | 时钟 | 固定“今天”。 |
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## 状态
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日期标题使用衬线字与旧金细线;无数据时显示空状态。
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## 事件
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无。
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## 键盘操作
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滚动容器按 MyGo 规则滚动。
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## 限制
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分组只在条数、首尾 ID 或时区变化时重算;中间条目原地修改需换新切片。
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