Refactor: delete StackItem
Callers skip a hidden child with if !hidden { build() }; an unbuilt
child already takes no room and no gap. Docs, Example and Gallery
updated.
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@@ -2,14 +2,16 @@
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## 用途
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按横向或纵向排列子元素,统一间距、对齐与换行。用 `StackItem` 包裹可隐藏的子项,隐藏时不占位置也不留间距。
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按横向或纵向排列子元素,统一间距、对齐与换行。要隐藏子项就不构建它(`if !hidden { build() }`),未构建的子项不占位置也不留间距。
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## 最小示例
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```go
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mujica.Stack(c, mujica.StackOptions{Horizontal: true, Gap: mujica.SpaceM}, func() {
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mujica.Button(c, "Save", mujica.ButtonOptions{})
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mujica.StackItem(!showDraft, func() { mujica.Button(c, "Draft", mujica.ButtonOptions{Variant: mujica.Secondary}) })
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if showDraft {
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mujica.Button(c, "Draft", mujica.ButtonOptions{Variant: mujica.Secondary})
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}
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mujica.Button(c, "Cancel", mujica.ButtonOptions{Variant: mujica.Ghost})
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})
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```
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@@ -17,7 +19,6 @@ mujica.Stack(c, mujica.StackOptions{Horizontal: true, Gap: mujica.SpaceM}, func(
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签名:
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- `func Stack(c *ui.Context, opts StackOptions, children func()) *ui.Element`
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- `func StackItem(hidden bool, build func())`
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## 参数
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@@ -29,8 +30,6 @@ mujica.Stack(c, mujica.StackOptions{Horizontal: true, Gap: mujica.SpaceM}, func(
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| `Justify` | `ui.Align` | `ui.Start` | 主轴分布:Start、Center、End、SpaceBetween、SpaceAround、SpaceEvenly。 |
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| `Wrap` | `bool` | false | 横向换行;纵向时设置会 panic。 |
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`StackItem`:`hidden` 为 true 时不构建 `build`,因此既不占空间也不产生间距。`build` 为 nil 时 panic。
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## 状态
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布局组件,无交互状态。
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