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>
60 lines
2.0 KiB
Markdown
60 lines
2.0 KiB
Markdown
# 345 VideoPlayer 视频播放器
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## 用途
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播放器外壳：画面由调用方提供，组件绘制状态并通过回调报告播放、暂停、跳转、倍速、字幕、全屏和画中画。
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## 最小示例
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```go
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st := media.VideoState{Duration: 4 * time.Minute, Rate: 1}
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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media.VideoPlayer(c, st, media.VideoPlayerOptions{
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OnPlay: func() { st.Playing = true }, // start your decoder
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OnPause: func() { st.Playing = false }, // pause it
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OnSeek: func(d time.Duration) { st.Position = d },
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OnRate: func(r float64) { st.Rate = r },
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})
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}
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ui.Render(view, 400, 300, 1)
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```
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## 参数
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`func VideoPlayer(c *ui.Context, st VideoState, opts VideoPlayerOptions) ui.Element`
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`VideoState`：`Frame`（当前画面，nil 显示“暂无视频”）、`Position`、`Duration`、`Buffered`、`Playing`、`Rate`、`Subtitle`、`SubtitlesOn`、`Fullscreen`、`PiP`。
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| `OnPlay / OnPause / OnSeek` | `func` | 必填 | 播放、暂停、跳转。 |
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| `OnRate` | `func(float64)` | nil | 倍速；nil 时不显示倍速选择。 |
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| `OnSubtitles / OnFullscreen / OnPiP` | `func(bool)` | nil | 开关回调；nil 时隐藏对应按钮。 |
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| `Disabled` | `bool` | false | 禁用全部控件。 |
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| `Label` | `string` | "Video" | 无障碍名称。 |
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## 状态
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- 画面区 16:9，黑底；字幕开启且有字幕时在底部显示。
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- 字幕、画中画、全屏按钮开启时有选中底色和下划线。
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## 事件
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全部通过回调报告；组件不改动 `st`。
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## 键盘操作
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| 按键 | 作用 |
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| --- | --- |
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| Tab | 先聚焦画面，再到进度条和各按钮 |
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| Space / K | 画面聚焦时播放或暂停 |
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| ← / → | 画面聚焦时后退 / 前进 5 秒 |
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| F | 切换全屏 |
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| C | 切换字幕 |
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## 限制
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- 组件不解码视频，也不实现全屏或画中画窗口，只报告用户的请求。
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- 帧率取决于调用方更新 `Frame` 并调用 `c.Invalidate()` 的频率。
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