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AtomUI/docs/Desktop.Controls/SplitButton/SplitButtonUsage.md
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# SplitButton 使用文档
本文档介绍 AtomUI SplitButton 控件的各种使用方式，示例代码摘自 Gallery 演示程序。
> 📖 Gallery 源码位置：`controlgallery/AtomUIGallery/ShowCases/Views/General/SplitButtonShowCase.axaml`
---
## 前置准备
在 AXAML 中使用 SplitButton，需要引入以下命名空间：
```xml
xmlns:atom="https://atomui.net"
xmlns:antdicons="https://atomui.net/icons/antdesign"
```
在 C# 代码中引入：
```csharp
using AtomUI.Desktop.Controls; // SplitButton 控件
using AtomUI.Controls; // SizeType 等共享类型
```
---
## 1. 基本用法
最基本的组合按钮，左侧主按钮执行默认操作，右侧按钮触发下拉菜单：
```xml
<atom:SplitButton TriggerType="Hover">
Hover me
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X"
Icon="{antdicons:AntDesignIconProvider Kind=ScissorOutlined}" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C"
Icon="{antdicons:AntDesignIconProvider Kind=CopyOutlined}" />
<atom:MenuItem Header="Delete" InputGesture="Ctrl+D"
Icon="{antdicons:AntDesignIconProvider Kind=DeleteOutlined}" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
**要点**：
- `Flyout` 属性接受 `MenuFlyout`，其中包含 `MenuItem` 菜单项
- 左侧主按钮点击触发 `Click` 事件，右侧按钮触发 Flyout 弹出
- 默认下拉按钮图标为 `EllipsisOutlined`（省略号）
- 默认使用 `Default` 样式（白色背景 + 边框）
---
## 2. 按钮类型
SplitButton 支持两种按钮类型，通过 `IsPrimaryButtonType` 属性切换：
```xml
<!-- Default 样式（默认） -->
<atom:SplitButton>
Default
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<!-- Primary 样式 -->
<atom:SplitButton IsPrimaryButtonType="True">
Primary
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
**使用场景指引**：
- **Default**：常规场景，并列操作区域中使用
- **Primary**：需要强调主操作的场景，如「提交」+ 下拉更多提交选项
---
## 3. 按钮尺寸
通过 `SizeType` 属性设置尺寸，支持 `Large`、`Middle`（默认）、`Small` 三种：
```xml
<StackPanel Orientation="Vertical" Spacing="10">
<!-- Default 样式的三种尺寸 -->
<WrapPanel>
<atom:SplitButton SizeType="Large">
Large
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X"
Icon="{antdicons:AntDesignIconProvider Kind=ScissorOutlined}" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C"
Icon="{antdicons:AntDesignIconProvider Kind=CopyOutlined}" />
<atom:MenuItem Header="Delete" InputGesture="Ctrl+D"
Icon="{antdicons:AntDesignIconProvider Kind=DeleteOutlined}" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton SizeType="Middle">
Middle
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton SizeType="Small">
Small
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
</WrapPanel>
<!-- Primary 样式的三种尺寸 -->
<WrapPanel>
<atom:SplitButton SizeType="Large" IsPrimaryButtonType="True">
Large
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton SizeType="Middle" IsPrimaryButtonType="True">
Middle
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton SizeType="Small" IsPrimaryButtonType="True">
Small
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
</WrapPanel>
</StackPanel>
```
> 📖 参考：`controlgallery/AtomUIGallery/ShowCases/Views/General/SplitButtonShowCase.axaml` 中 "Size" 示例。
---
## 4. 危险按钮
通过 `IsDanger="True"` 标记危险操作，Default 和 Primary 类型均支持：
```xml
<WrapPanel Orientation="Horizontal">
<atom:SplitButton IsDanger="True">
Default
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X"
Icon="{antdicons:AntDesignIconProvider Kind=ScissorOutlined}" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C"
Icon="{antdicons:AntDesignIconProvider Kind=CopyOutlined}" />
<atom:MenuItem Header="Delete" InputGesture="Ctrl+D"
Icon="{antdicons:AntDesignIconProvider Kind=DeleteOutlined}" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton IsDanger="True" IsPrimaryButtonType="True">
Primary
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C" />
<atom:MenuItem Header="Delete" InputGesture="Ctrl+D" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
</WrapPanel>
```
**使用场景**：删除、移动、修改权限等不可逆操作。
> 📖 参考：`controlgallery/AtomUIGallery/ShowCases/Views/General/SplitButtonShowCase.axaml` 中 "Danger Buttons" 示例。
---
## 5. 自定义下拉图标
通过 `OpenIndicator` 属性自定义右侧下拉按钮的图标（默认为 `EllipsisOutlined`）：
```xml
<WrapPanel Orientation="Horizontal">
<!-- 默认图标（EllipsisOutlined） -->
<atom:SplitButton>
Default
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<!-- 自定义图标 -->
<atom:SplitButton OpenIndicator="{antdicons:AntDesignIconProvider Kind=UserOutlined}">
Custom Icon
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
</WrapPanel>
```
> 📖 参考：`controlgallery/AtomUIGallery/ShowCases/Views/General/SplitButtonShowCase.axaml` 中 "Custom Icon" 示例。
---
## 6. 主按钮带图标
通过 `Icon` 属性为左侧主按钮添加图标：
```xml
<atom:SplitButton Icon="{antdicons:AntDesignIconProvider Kind=DownloadOutlined}">
Download
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Download as PDF" />
<atom:MenuItem Header="Download as Word" />
<atom:MenuItem Header="Download as Excel" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
---
## 7. 触发方式
支持 `Click`（默认）和 `Hover` 两种触发方式：
```xml
<WrapPanel Orientation="Horizontal">
<atom:SplitButton TriggerType="Hover">
Hover Me
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X"
Icon="{antdicons:AntDesignIconProvider Kind=ScissorOutlined}" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C"
Icon="{antdicons:AntDesignIconProvider Kind=CopyOutlined}" />
<atom:MenuItem Header="Delete" InputGesture="Ctrl+D"
Icon="{antdicons:AntDesignIconProvider Kind=DeleteOutlined}" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton TriggerType="Click">
Click Me
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" InputGesture="Ctrl+X"
Icon="{antdicons:AntDesignIconProvider Kind=ScissorOutlined}" />
<atom:MenuItem Header="Copy" InputGesture="Ctrl+C"
Icon="{antdicons:AntDesignIconProvider Kind=CopyOutlined}" />
<atom:MenuItem Header="Delete" InputGesture="Ctrl+D"
Icon="{antdicons:AntDesignIconProvider Kind=DeleteOutlined}" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
</WrapPanel>
```
**触发方式说明**：
- **Click**：点击右侧下拉按钮弹出菜单（桌面端推荐，操作明确）
- **Hover**：鼠标悬浮在右侧按钮上时弹出菜单（适合预览场景，减少点击次数）
使用 `Hover` 模式时，可通过 `MouseEnterDelay` 和 `MouseLeaveDelay` 控制延迟：
```xml
<atom:SplitButton TriggerType="Hover"
MouseEnterDelay="300"
MouseLeaveDelay="200">
Custom Delay
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Option 1" />
<atom:MenuItem Header="Option 2" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
> 📖 参考：`controlgallery/AtomUIGallery/ShowCases/Views/General/SplitButtonShowCase.axaml` 中 "Flyout trigger type" 示例。
---
## 8. 弹出位置和箭头
通过 `Placement` 控制弹出方向，`IsShowArrow` 控制箭头显示：
```xml
<!-- 下方右对齐（默认） -->
<atom:SplitButton Placement="BottomEdgeAlignedRight">
Bottom Right
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Option 1" />
<atom:MenuItem Header="Option 2" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<!-- 下方居中 + 显示箭头 -->
<atom:SplitButton Placement="Bottom"
IsShowArrow="True"
IsPointAtCenter="True">
Bottom Center with Arrow
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Option 1" />
<atom:MenuItem Header="Option 2" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<!-- 上方弹出 -->
<atom:SplitButton Placement="Top">
Top
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Option 1" />
<atom:MenuItem Header="Option 2" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
---
## 9. 主按钮点击事件与 Command
### 事件方式
```xml
<atom:SplitButton Click="HandleSplitButtonClick">
Submit
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Save as Draft" />
<atom:MenuItem Header="Export" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
```csharp
// Code-behind
private void HandleSplitButtonClick(object? sender, RoutedEventArgs e)
{
// 处理主按钮点击
Debug.WriteLine("SplitButton primary clicked!");
}
```
### Command 方式（MVVM）
```xml
<atom:SplitButton Command="{Binding SubmitCommand}" CommandParameter="draft">
Submit
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Save as Draft"
Command="{Binding SaveDraftCommand}" />
<atom:MenuItem Header="Export as PDF"
Command="{Binding ExportCommand}"
CommandParameter="pdf" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
```csharp
// ViewModel（使用 ReactiveUI）
[Reactive]
public ReactiveCommand<string, Unit> SubmitCommand { get; }
public MyViewModel()
{
var canSubmit = this.WhenAnyValue(x => x.IsValid);
SubmitCommand = ReactiveCommand.CreateFromTask<string>(
async (param) => { await _repository.SubmitAsync(param); },
canSubmit);
}
```
当 `CanExecute` 返回 `false` 时，SplitButton 会**自动禁用**（灰色调 + 不可点击），无需手动管理 `IsEnabled`。
---
## 10. 键盘快捷键
利用 `HotKey` 属性设置键盘快捷键：
```xml
<!-- Ctrl+S 触发主按钮 -->
<atom:SplitButton HotKey="Ctrl+S"
Command="{Binding SaveCommand}">
Save (Ctrl+S)
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Save as Draft" />
<atom:MenuItem Header="Save and Close" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
**内置键盘交互**（无需配置）：
- `Space` / `Enter`：触发主按钮点击
- `Alt+Down` / `F4`：打开 Flyout
- `Escape`：关闭 Flyout
---
## 11. 禁用状态
通过 `IsEnabled="False"` 禁用 SplitButton，两个内部按钮同步禁用：
```xml
<!-- 正常 vs 禁用对比 -->
<WrapPanel>
<atom:SplitButton>
Default
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton IsEnabled="False">
Default (disabled)
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
</WrapPanel>
<!-- Primary 禁用 -->
<WrapPanel>
<atom:SplitButton IsPrimaryButtonType="True">
Primary
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:SplitButton IsPrimaryButtonType="True" IsEnabled="False">
Primary (disabled)
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Cut" />
<atom:MenuItem Header="Copy" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
</WrapPanel>
```
---
## 12. 控制动画行为
```xml
<!-- 禁用过渡动画（背景色、前景色不再渐变过渡） -->
<atom:SplitButton IsMotionEnabled="False">
No Animation
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Option 1" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<!-- 禁用点击波纹效果 -->
<atom:SplitButton IsWaveSpiritEnabled="False">
No Wave
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Option 1" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
---
## 常见组合模式
### 主操作 + 更多操作
最常见的场景——主按钮执行默认操作，下拉菜单提供替代方案：
```xml
<atom:SplitButton IsPrimaryButtonType="True"
Click="HandleSubmit">
Submit
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Save as Draft"
Icon="{antdicons:AntDesignIconProvider Kind=FileOutlined}" />
<atom:MenuItem Header="Export as PDF"
Icon="{antdicons:AntDesignIconProvider Kind=FilePdfOutlined}" />
<atom:MenuItem Header="Print"
Icon="{antdicons:AntDesignIconProvider Kind=PrinterOutlined}" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
### 下载按钮 + 格式选择
```xml
<atom:SplitButton Icon="{antdicons:AntDesignIconProvider Kind=DownloadOutlined}">
Download
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Download as PDF" />
<atom:MenuItem Header="Download as Word" />
<atom:MenuItem Header="Download as Excel" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
### 危险操作 + 确认选项
```xml
<atom:SplitButton IsDanger="True" IsPrimaryButtonType="True"
Icon="{antdicons:AntDesignIconProvider Kind=DeleteOutlined}">
Delete
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Delete Selected" />
<atom:MenuItem Header="Delete All" />
<atom:MenuItem Header="Move to Trash" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
```
### 操作栏组合（SplitButton + Button）
```xml
<StackPanel Orientation="Horizontal" Spacing="8">
<atom:SplitButton IsPrimaryButtonType="True"
Command="{Binding SaveCommand}">
Save
<atom:SplitButton.Flyout>
<atom:MenuFlyout>
<atom:MenuItem Header="Save as Draft" />
<atom:MenuItem Header="Save and Close" />
</atom:MenuFlyout>
</atom:SplitButton.Flyout>
</atom:SplitButton>
<atom:Button>Cancel</atom:Button>
</StackPanel>
```
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