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>
53 lines
1.8 KiB
Markdown
53 lines
1.8 KiB
Markdown
# 301 DiffViewer 差异查看器
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## 用途
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按行比较两段文本，统一或并排显示：行号、增删高亮、折叠较长的未变更区；大文件只构建可见行。
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## 最小示例
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```go
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var state git.DiffViewerState
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from := "func main() {\n\tprintln(\"hi\")\n}\n"
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to := "func main() {\n\tprintln(\"hello\")\n}\n"
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view := func(c *ui.Context) {
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core.Use(c, core.Settings{})
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git.DiffViewer(c, &state, from, to, git.DiffViewerOptions{Language: "go", SideBySide: true}).Height(240)
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}
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ui.Render(view, 400, 300, 1)
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```
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签名：`func DiffViewer(c *ui.Context, s *DiffViewerState, from, to string, opts DiffViewerOptions) ui.Element`
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## 参数
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`DiffViewerOptions`
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| 字段 | 类型 | 默认值 | 含义 |
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| --- | --- | --- | --- |
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| SideBySide | bool | false | 并排两栏；否则统一一栏。 |
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| Context | int | 0（即 3） | 变更前后保留的未变更行数；为负 panic。 |
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| Language | string | "" | 语法高亮语言，如 go；空为纯文本。 |
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`DiffViewerState` 由调用方持有，保存差异、已展开的折叠与滚动位置。差异只在 from 或 to 改变时重新计算（Myers 行差异）。给返回元素一个高度。
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## 状态
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- 删除行：Danger 浅色底与 − 号；新增行：Success 浅色底与 + 号；不只靠颜色。
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- 统一视图显示新旧两列行号；并排视图每侧一列，缺行的一侧为空底。
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- 超过 2×Context 的未变更区折叠为“N 行未更改”按钮，点击展开，悬停 120 ms 过渡。
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## 事件
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- 无；展开折叠保存在状态中。
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## 键盘操作
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- 列表可获得焦点并滚动；折叠按钮用 Tab 到达，Enter 或 Space 展开。
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## 限制
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- 只做行级差异；词级差异见 InlineDiff。
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- 长行不换行，超出部分裁剪。
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- 文本换成新字符串后折叠全部重置。
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