Question

我不需要在单元格之间进行焦点导航。我尝试在单元格样式中设置Focusable =“False”并调整该行的focusvisualstyle，但在这种情况下选择失败。

Answer 1

是的，您需要将DataGrid的Selection Unit设置为FullRow，并将borderThickness to 0设置为FocusVisualStyle to null。

<DataGrid SelectionUnit="FullRow">
  <DataGrid.CellStyle>
      <Style TargetType="DataGridCell">
          <Setter Property="BorderThickness" Value="0"/>
          <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
       </Style>
  </DataGrid.CellStyle>
  <!-- ... -->
</DataGrid>

<强>更新

上面说的xaml最好只能用xaml方法做，但是如果你想要处理表格，那么你必须去后面的代码。这就是我实现它的方式 -

<DataGrid x:Name="dg" ItemsSource="{Binding Objects}" SelectionUnit="FullRow">
  <DataGrid.CellStyle>
     <Style TargetType="DataGridCell">
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <EventSetter Event="PreviewKeyDown" Handler="dg_PreviewKeyDown"/>
      </Style>
  </DataGrid.CellStyle>
</DataGrid>

背后的代码（我在这里做的是如果用户按下右键或左键只需处理它们以便停止从一个单元格导航到另一个单元格，以防万一用户按Tab键，焦点应该转到下一行（如果可用）而不是移动到下一个单元格 -

private void dg_PreviewKeyDown(object sender, KeyEventArgs e)
{
  if (e.Key == Key.Left || e.Key == Key.Right)
     e.Handled = true;
  else if (e.Key == Key.Tab)
  {
     DataGridRow a = UtilityFunctions.FindParent<DataGridRow>(sender as DependencyObject);
     DataGridRow nextDataGridRow =(DataGridRow)dg.ItemContainerGenerator
                                     .ContainerFromIndex(a.GetIndex() + 1);
     if (nextDataGridRow != null)
     {
        dg.SelectedIndex = a.GetIndex() + 1;
        DataGridCell cell = UtilityFunctions.FindChild<DataGridCell>
                              (nextDataGridRow as DependencyObject, "");
        cell.Focus();
     }
     e.Handled = true;
   }
}

在上面的代码中，我使用了一些实用程序函数来移动Visual树以在Visual树中查找必要的父或子。供您参考，代码如下 -

public class UtilityFunctions
{
   public static Parent FindParent<Parent>(DependencyObject child)
            where Parent : DependencyObject
        {
            DependencyObject parentObject = child;

            //We are not dealing with Visual, so either we need to fnd parent or
            //get Visual to get parent from Parent Heirarchy.
            while (!((parentObject is System.Windows.Media.Visual) || (parentObject is System.Windows.Media.Media3D.Visual3D)))
            {
                if (parentObject is Parent || parentObject == null)
                {
                    return parentObject as Parent;
                }
                else
                {
                    parentObject = (parentObject as FrameworkContentElement).Parent;
                }
            }

            //We have not found parent yet , and we have now visual to work with.
            parentObject = VisualTreeHelper.GetParent(parentObject);

            //check if the parent matches the type we're looking for
            if (parentObject is Parent || parentObject == null)
            {
                return parentObject as Parent;
            }
            else
            {
                //use recursion to proceed with next level
                return FindParent<Parent>(parentObject);
            }
        }

   public static T FindChild<T>(DependencyObject parent, string childName)
           where T : DependencyObject
        {
            // Confirm parent is valid.  
            if (parent == null) return null;

            T foundChild = null;

            int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < childrenCount; i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                // If the child is not of the request child type child 
                T childType = child as T;
                if (childType == null)
                {
                    // recursively drill down the tree 
                    foundChild = FindChild<T>(child, childName);

                    // If the child is found, break so we do not overwrite the found child.  
                    if (foundChild != null) break;
                }
                else if (!string.IsNullOrEmpty(childName))
                {
                    var frameworkElement = child as FrameworkElement;
                    // If the child's name is set for search 
                    if (frameworkElement != null && frameworkElement.Name == childName)
                    {
                        // if the child's name is of the request name 
                        foundChild = (T)child;
                        break;
                    }
                }
                else
                {
                    // child element found. 
                    foundChild = (T)child;
                    break;
                }
            }

            return foundChild;
        }
}

Answer 2

删除单元格之间的焦点导航：使用下面的代码

有没有简单的方法使整行成为DataGrid的唯一可聚焦单元？

2 个答案: