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>
44 lines
1.6 KiB
Markdown
44 lines
1.6 KiB
Markdown
# 002 TitleBar 标题栏
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## 用途
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窗口顶部的标题行：衬线体应用标题、前后工具插槽。空白处可拖动窗口，并为系统窗口按钮留出空间。配合 `mygo.TitleBarHidden` 使用。
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## 最小示例
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```go
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layout.TitleBar(c, "Court Records", layout.TitleBarOptions{
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Trailing: func() { input.Button(c, "Share", input.ButtonOptions{Variant: input.Ghost}) },
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})
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```
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签名：`func TitleBar(c *ui.Context, title string, opts TitleBarOptions) 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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| `title` | `string` | 必填 | 标题文字，过长时单行省略。 |
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| `Leading` | `func()` | nil | 标题前的工具，如侧栏开关。 |
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| `Trailing` | `func()` | nil | 标题后的工具。 |
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## 状态
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- 最小高度取 `c.TitleBar().Height` 与 `控件高度 + 2 单位` 中较大者（默认密度 44 DIP）；标题字号随系统文本缩放，放大后标题栏随之增高。
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- 左右内边距在 `c.TitleBar().Left/Right` 之外再加 3 单位，不覆盖系统按钮；全屏时预留为 0。
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- Surface 底色，底部 1 DIP Border 分隔线。
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## 事件
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TitleBar 本身无事件；插槽中控件照常报告 `Clicked` 等事件。
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## 键盘操作
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插槽控件照常接受 Tab、Enter、Space。标题栏本身不获取焦点。
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## 限制
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- 拖动、双击缩放由 MyGo `DragWindow` 实现，只作用于非交互区域；需真机验证，无窗口测试无法覆盖。
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- 系统窗口按钮外观由系统决定，不换肤。
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- 普通有标题栏的窗口中 `c.TitleBar()` 为零，组件只是一行普通标题。
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