Infragistics XamDataGrid 更改所选项目和焦点的问题

Question

我有 3 个 XamDataGrids，每个都有不同的来源，我希望不同的网格一起行动，所以如果选择第一个网格并按下右箭头，应该取消选择第一个网格，应该聚焦第二个网格，第一个项目在第二格应该被选中。这工作正常，但是，按向左箭头键似乎不起作用。焦点实际上向右移动，没有选择任何项目。用于确定下一个网格的逻辑对于左键单击和右键单击是相同的，但由于某种原因，只有左箭头键会导致问题。

景色：

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>

    <dataPresenter:XamDataGrid Grid.Column="0" x:Name="Grid1" DataSource="{Binding Grid1Source}" PreviewKeyDown="Handle_PreviewKeyDown"/>
    <dataPresenter:XamDataGrid Grid.Column="1" x:Name="Grid2" DataSource="{Binding Grid2Source}" PreviewKeyDown="Handle_PreviewKeyDown"/>
    <dataPresenter:XamDataGrid Grid.Column="2" x:Name="Grid3" DataSource="{Binding Grid3Source}" PreviewKeyDown="Handle_PreviewKeyDown"/>

</Grid>

代码隐藏：

    public TestView()
    {
        InitializeComponent();

        viewmodel = // Get ViewModel
        DataContext = viewmodel;

        viewmodel.Initialize();
    }

    private void Handle_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        var currentGrid = sender as XamDataGrid;
        switch (e.Key)
        {
            case Key.Left:
            case Key.Right:
                var grid = GetNextGrid(currentGrid, e);
                if (grid != null)
                {
                    ChangeGrid(currentGrid, grid);
                }
                break;
        }
    }

    private void ChangeGrid(XamDataGrid previousGrid, XamDataGrid nextGrid)
    {
        previousGrid.SelectedItems.Records.Clear();
        previousGrid.ActiveRecord = null;

        nextGrid.SelectedItems.Records.Clear();
        nextGrid.ActiveRecord = null;

        nextGrid.SelectedItems.Records.Add(nextGrid.Records[0]);
        nextGrid.SelectedDataItem = nextGrid.Records[0];

        nextGrid.Focus();
    }

    private XamDataGrid GetNextGrid(XamDataGrid currentGrid, KeyEventArgs e)
    {
        switch (currentGrid.Name)
        {
            case "Grid1":
                if (e.Key == Key.Left)
                {
                    return Grid3.Records.Count > 0 ? Grid3 : Grid2.Records.Count > 0 ? Grid2 : null;
                }
                else if (e.Key == Key.Right)
                {
                    return Grid2.Records.Count > 0 ? Grid2 : Grid3.Records.Count > 0 ? Grid3 : null;
                }
                break;
            case "Grid2":
                if (e.Key == Key.Left)
                {
                    return Grid1.Records.Count > 0 ? Grid1 : Grid3.Records.Count > 0 ? Grid3 : null;
                }
                else if (e.Key == Key.Right)
                {
                    return Grid3.Records.Count > 0 ? Grid3 : Grid1.Records.Count > 0 ? Grid1 : null;
                }
                break;
            case "Grid3":
                if (e.Key == Key.Left)
                {
                    return Grid2.Records.Count > 0 ? Grid2 : Grid1.Records.Count > 0 ? Grid1 : null;
                }
                else if (e.Key == Key.Right)
                {
                    return Grid1.Records.Count > 0 ? Grid1 : Grid2.Records.Count > 0 ? Grid2 : null;
                }
                break;
        }

        return null;
    }

视图模型：

public class TestViewModel : INotifyPropertyChanged
{
    #region variables

    public event PropertyChangedEventHandler PropertyChanged;

    private ObservableCollection<string> grid1Source = new ObservableCollection<string>();
    private ObservableCollection<string> grid2Source = new ObservableCollection<string>();
    private ObservableCollection<string> grid3Source = new ObservableCollection<string>();

    public ObservableCollection<string> Grid1Source
    {
        get => grid1Source;
        set
        {
            grid1Source = value;
            RaisePropertyChanged(nameof(Grid1Source));
        }
    }

    public ObservableCollection<string> Grid2Source
    {
        get => grid2Source;
        set
        {
            grid2Source = value;
            RaisePropertyChanged(nameof(Grid2Source));
        }
    }

    public ObservableCollection<string> Grid3Source
    {
        get => grid3Source;
        set
        {
            grid3Source = value;
            RaisePropertyChanged(nameof(Grid3Source));
        }
    }

    #endregion

    #region INotify

    public void RaisePropertyChanged(string propertyname)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyname));
        }
    }

    # endregion

    public TestViewModel() 
    {
        Grid1Source = new ObservableCollection<string> { "Grid1 Test1", "Grid1 Test2", "Grid1 Test3", "Grid1 Test4", "Grid1 Test5" };
        Grid2Source = new ObservableCollection<string> { "Grid2 Test1", "Grid2 Test2", "Grid2 Test3", "Grid2 Test4" };
        Grid3Source = new ObservableCollection<string> { "Grid3 Test1", "Grid3 Test2", "Grid3 Test3" };
    }

    public void Initialize()
    {
        RaisePropertyChanged(nameof(Grid1Source));
        RaisePropertyChanged(nameof(Grid2Source));
        RaisePropertyChanged(nameof(Grid3Source));
    }
}

编辑：似乎问题没有将 PreviewKeyDown 事件标记为已处理