Question

在WPF中，我有一个带有一些折叠行的DataGrid。当我编辑单元格然后按Enter键时，如果下一行折叠，则选择不会移动到下一个可见行。相反，我刚刚编辑的单元格周围有一个虚线矩形，键入键盘导致完全没有动作。知道如何让选择跳转到下一个可见行吗？谢谢

示例（在框架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enter，您应该卡在第二行。

Answer 1

知道如何让选择跳转到下一个可见行吗？

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

您可以通过处理DataGrid的PreviewKeyDown事件来解决这个问题：

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：您可能还希望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

如果只有一行折叠的行可以跳过，则mm8的答案是完美的。相邻行折叠时，代码进入无限循环。

在获取下一行代码时，代码应增加selectedIndex而不是将1加到同一值。

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前进到折叠的行，将触发DataGrid上的所有SelectedCellsChanged或SelectionChanged事件。对于您的应用程序而言，这可能并不理想，具体取决于它们在这些事件中的作用。

在这种情况下，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循环是有意的，因为条件中的索引是高级的。（我不喜欢这种代码样式，但是它可以工作）

（背景：我尝试将此更正内容作为对mm8答案的修改进行提交，但由于更改了答案的内容，因此该修改被拒绝。因为我没有足够的代表来添加评论，每{{3} }，我将更正作为新答案发布。）

使用隐藏行在DataGrid中编辑单元格

2 个答案: