Helix Toolkit WPF中CombinedManipulator能否将触发方式从右键改为左键？

CombinedManipulator默认绑定右键作为操作触发键，没有公开的直接配置属性，可通过以下两种方式实现左键触发：

方法1：自定义重写操纵器类（稳定性最高） #

继承官方CombinedManipulator，替换鼠标事件的键位判断逻辑：

using HelixToolkit.Wpf;
using System.Windows.Input;

public class LeftClickCombinedManipulator : CombinedManipulator
{
    protected override void OnMouseDown(MouseButtonEventArgs e)
    {
        // 仅响应左键触发操作
        if (e.ChangedButton == MouseButton.Left)
        {
            base.OnMouseDown(e);
            e.Handled = true;
        }
        // 屏蔽原右键触发逻辑
        else if (e.ChangedButton == MouseButton.Right)
        {
            e.Handled = true;
        }
    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        if (Mouse.LeftButton == MouseButtonState.Pressed)
        {
            base.OnMouseMove(e);
        }
    }

    protected override void OnMouseUp(MouseButtonEventArgs e)
    {
        if (e.ChangedButton == MouseButton.Left)
        {
            base.OnMouseUp(e);
            e.Handled = true;
        }
    }
}

修改XAML代码：

1. 引入自定义类所在命名空间，比如xmlns:local="clr-namespace:你的项目命名空间"
2. 替换原CombinedManipulator声明：<local:LeftClickCombinedManipulator x:Name="rTManipulator" CanRotateX="True" CanRotateY="True" CanRotateZ="True" />
3. 为HelixViewport3D添加属性RotateGesture="{x:Static InputGesture.Empty}"，禁用默认左键旋转相机功能，避免操作冲突

方法2：事件劫持（无需新增类，适合快速调整） #

直接在页面后置代码中监听事件，模拟右键操作触发操纵器逻辑：

// 窗口构造函数中注册事件
public MainWindow()
{
    InitializeComponent();
    rTManipulator.MouseLeftButtonDown += RTManipulator_MouseLeftButtonDown;
    rTManipulator.MouseLeftButtonUp += RTManipulator_MouseLeftButtonUp;
    rTManipulator.MouseMove += RTManipulator_MouseMove;
    // 屏蔽原右键触发
    rTManipulator.MouseRightButtonDown += (s,e) => e.Handled = true;
    // 禁用视口默认左键旋转
    viewPort3d.RotateGesture = null;
}

private void RTManipulator_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    var mockRightDownArgs = new MouseButtonEventArgs(e.MouseDevice, e.Timestamp, MouseButton.Right)
    {
        RoutedEvent = MouseRightButtonDownEvent,
        Source = e.Source
    };
    rTManipulator.RaiseEvent(mockRightDownArgs);
    e.Handled = true;
}

private void RTManipulator_MouseMove(object sender, MouseEventArgs e)
{
    if (Mouse.LeftButton == MouseButtonState.Pressed)
    {
        var mockMoveArgs = new MouseEventArgs(e.MouseDevice, e.Timestamp)
        {
            RoutedEvent = MouseMoveEvent,
            Source = e.Source
        };
        rTManipulator.RaiseEvent(mockMoveArgs);
    }
}

private void RTManipulator_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    var mockRightUpArgs = new MouseButtonEventArgs(e.MouseDevice, e.Timestamp, MouseButton.Right)
    {
        RoutedEvent = MouseRightButtonUpEvent,
        Source = e.Source
    };
    rTManipulator.RaiseEvent(mockRightUpArgs);
    e.Handled = true;
}

注意：原XAML代码中MouseLeftButtonUp事件绑定的方法名为Viewport3D_MouseMove，建议调整命名避免逻辑混淆，防止事件触发冲突。

内容的提问来源于stack exchange，提问作者Faceless