使用隐藏行编辑 DataGrid 中的单元格

Question

在 WPF 中，我有一个带有一些折叠行的 DataGrid。当我编辑一个单元格然后按回车键时，如果下一行折叠，则选择不会移动到下一个可见行。取而代之的是，一个虚线矩形围绕着我刚刚编辑的单元格，并且在键盘上键入根本没有任何动作。知道如何使选择跳转到下一个可见行吗？谢谢

示例（框架4.0下）： xaml:

<Window x:Class="WpfDataGridEdit.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <DataGrid AutoGenerateColumns="False" Name="dataGrid">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Path=Value1}"/>
            <DataGridTextColumn Binding="{Binding Path=Value2}"/>
        </DataGrid.Columns>
        <DataGrid.RowStyle>
            <Style TargetType="{x:Type DataGridRow}">
                <Setter Property="Visibility" Value="{Binding Visibility}" />
            </Style>
        </DataGrid.RowStyle>
    </DataGrid>
</Window>

背后的代码：

using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace WpfDataGridEdit
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private List<Row> rows = new List<Row>();

        public MainWindow()
        {
            InitializeComponent();

            for (int i = 0; i < 10; i++)
                this.rows.Add(new Row { Value1 = i.ToString(), Value2 = "x", Visibility = i % 3 == 0 ? Visibility.Collapsed : Visibility.Visible });

            this.dataGrid.ItemsSource = this.rows;
        }
    }

    public class Row
    {
        private string value1;
        public string Value1
        {
            get { return this.value1; }
            set { this.value1 = value; }
        }

        private string value2;
        public string Value2
        {
            get { return this.value2; }
            set { this.value2 = value; }
        }

        private Visibility visibility;
        public Visibility Visibility
        {
            get { return this.visibility; }
            set { this.visibility = value; }
        }
    }
}

通过编辑行并输入回车，您应该会卡在第二行。

Answer 1

Any idea how I can make the selection jump to the next visible row?

此行为已报告为错误：https://connect.microsoft.com/VisualStudio/feedback/details/526014/keyboard-navigation-doesnt-work-when-the-wpf-datagrid-has-collapsed-or-hidden-rows

您可以通过像这样处理 DataGrid 的 PreviewKeyDown 事件来绕过它：

private void dataGrid_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        e.Handled = true;
        DataGrid dg = sender as DataGrid;
        int index = dg.SelectedIndex;
        if (index < dg.Items.Count - 1)
        {
            dg.SelectedIndex++;
            DataGridRow nextRow = dg.ItemContainerGenerator.ContainerFromIndex(dg.SelectedIndex) as DataGridRow;
            while (nextRow != null && nextRow.Visibility == Visibility.Collapsed)
                nextRow = dg.ItemContainerGenerator.ContainerFromIndex(dg.SelectedIndex + 1) as DataGridRow;

            if (nextRow != null)
            {
                dg.SelectedItem = nextRow.DataContext;
                dg.CurrentCell = new DataGridCellInfo(nextRow.DataContext, dg.Columns[0]);
            }
        }
    }
}

编辑： 您可能还想通过将事件处理程序连接到 BeginningEdit 事件来保存当前编辑列的索引：

DataGridColumn _lastEditedColumn;
private void dataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
{
    DataGrid dg = sender as DataGrid;
    _lastEditedColumn = dg.CurrentCell.Column;
}

..并将 CurrentCell 设置为这个：

if (nextRow != null)
{
    dg.SelectedItem = nextRow.DataContext;
    dg.CurrentCell = new DataGridCellInfo(nextRow.DataContext, _lastEditedColumn); //<---
}

Answer 2

如果您只有折叠的一行可以跳过，那么 mm8 的回答是完美的。当相邻行折叠时，代码进入无限循环。

获取下一行时，代码应增加 selectedIndex，而不是将 1 加到相同的值。

即将 dg.SelectedIndex + 1 替换为 ++dg.SelectedIndex

像这样：

private void dataGrid_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        e.Handled = true;
        DataGrid dg = sender as DataGrid;
        int index = dg.SelectedIndex;
        if (index < dg.Items.Count - 1)
        {
            dg.SelectedIndex++;
            DataGridRow nextRow = dg.ItemContainerGenerator.ContainerFromIndex(dg.SelectedIndex) as DataGridRow;
            while (nextRow != null && nextRow.Visibility == Visibility.Collapsed)
                nextRow = dg.ItemContainerGenerator.ContainerFromIndex(++dg.SelectedIndex) as DataGridRow;

            if (nextRow != null)
            {
                dg.SelectedItem = nextRow.DataContext;
                dg.CurrentCell = new DataGridCellInfo(nextRow.DataContext, dg.Columns[0]);
            }
        }
    }
}

注意：通过将 DataGrid 的 SelectedIndex 推进到折叠的行，DataGrid 上的任何 SelectedCellsChanged 或 SelectionChanged 事件都将触发。这可能不适合您的应用程序，具体取决于它在这些事件中的作用。

如果是这种情况，您可能需要考虑使用变量来保存索引，如下所示：

private void dataGrid_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        e.Handled = true;
        DataGrid dg = sender as DataGrid;
        int index = dg.SelectedIndex;
        int maxIndex = dg.Items.Count - 1;

        while (index < maxIndex
            && (dg.ItemContainerGenerator.ContainerFromIndex(++index) as DataGridRow)?.Visibility == Visibility.Collapsed)
        {
        }

        if ((dg.ItemContainerGenerator.ContainerFromIndex(index) as DataGridRow)?.Visibility == Visibility.Visible)
        {
            dg.SelectedIndex = index;
        }
    }
}

空的 while 循环是故意的，因为索引在条件中提前。（我不喜欢这种代码风格，但它确实有效）

（背景：我试图将此更正作为对 mm8 答案的编辑提交，但因为它更改了答案的内容，所以编辑被拒绝了。因为我没有足够的代表来添加评论，根据 advice on editing，我将更正作为新答案发布。）

使用隐藏行编辑 DataGrid 中的单元格

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