当datagrid-cell获得焦点时自动编辑WPF datagrid内容 [英] Automatic editing of WPF datagrid content when datagrid-cell gets focus

问题描述

我在WPF中有一个数据网格，其中有一个 DataGridTextColum 和一个 DataGridTemplateColum 。

I have a datagrid in WPF with a DataGridTextColum and a DataGridTemplateColum.

<DataGridTextColumn Width="4*" IsReadOnly="True" x:Name="dataGridColumnDescription" 
Header="Description" Binding="{Binding Description}">
</DataGridTextColumn>

<DataGridTemplateColumn CellStyle="{StaticResource CellEditing}" IsReadOnly="False" Width="*" Header="Value" 
CellEditingTemplateSelector="{StaticResource myCellEditingTemplateSelectorValue}" 
CellTemplateSelector="{StaticResource myCellTemplateSelectorValue}">
</DataGridTemplateColumn>

CellTemplateSelector返回带有TextBlock的DataTemplate作为Celltemplate的响应。

The CellTemplateSelectors return a DataTemplate with a TextBlock for the the Celltemplate resp. a TextBox for CellEditing!

<DataTemplate x:Key="dGridStringValueTemplate">
    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="{Binding Path=Value}"/>
</DataTemplate>

<DataTemplate x:Key="dGridStringValueTemplateEditing">
    <TextBox TextAlignment="Center" VerticalAlignment="Center" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" BorderThickness="1" Text="{Binding Path=Value, UpdateSourceTrigger=LostFocus}"/>
</DataTemplate>

现在，我想在DataGridCell获得焦点时自动对文本框进行聚焦。用户应该能够编辑TextBox内容而无需双击单元格。

我发现了这篇文章：

DataGrid提示&技巧：单击编辑
，可以在其中获取当前的DataGridCell，但是如何访问内容以使文本框具有焦点来编辑内容？

DataGrid Tips & Tricks: Single-Click Editing where I can get the Current DataGridCell, but how can I access the content to give the Textbox the focus to edit the content?

这是我的风格：

<Style x:Key="CellEditing" TargetType="{x:Type DataGridCell}">
    <EventSetter Event="PreviewMouseLeftButtonDown" Handler="myDataGridMain_PreviewMouseLeftButtonDown"></EventSetter>
</Style>

这是我的事件处理程序：

This is my event handler:

private void myDataGridMain_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    DataGridCell cell = sender as DataGridCell;     // cell ist not null

    DataGridTemplateColumn col = cell.Column as DataGridTemplateColumn; //col is not null

    DataTemplate template = col.CellTemplate;  //this is null
}

如何获得带有该文本框的文本框事件处理程序？

推荐答案

我管理了它，虽然不是最好的解决方案，但它可以工作...
当Cell获得焦点时，我将其设置为编辑模式。

I managed it, not the best solution but it works... When Cell gets focus I set it to editing mode.

private void myDataGridMain_OnFocus(object sender, RoutedEventArgs e)
{
    DataGridCell cell = sender as DataGridCell;
    if (cell != null)
        cell.IsEditing = true;
    //var test = FindVisualChild<TextBlock>(cell);
}

在Keydown上，我搜索视觉孩子并给出焦点。

On Keydown I search for the visual child and give the focus.

private void myDataGridMain_KeyDown(object sender, KeyEventArgs e)
        {
            DataGridCell cell = sender as DataGridCell;

            if (e.Key == Key.Enter)
            {   //give cell the focus
                cell.Focus();
            }
            else
            {
                if ((cell != null))
                {
                    TextBox textbox = FindVisualChild<TextBox>(cell);
                    if (textbox != null)
                    {   //TextBox has benn found
                        if ((textbox as TextBox).IsFocused == false)
                        {
                            (textbox as TextBox).SelectAll();
                        }
                        (textbox as TextBox).Focus();
                    }

                    CheckBox chkbox = FindVisualChild<CheckBox>(cell);
                    if (chkbox != null)
                    {   //Checkbox has been found
                        (chkbox as CheckBox).Focus();
                    }

                    ComboBox combbox = FindVisualChild<ComboBox>(cell);
                    if (combbox != null)
                    {   //ComboBox has been found
                        (combbox as ComboBox).Focus();
                    }
                }
            }
        }

查找视觉子代！

public static T FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(obj, i);
        if (child != null && child is T)
            return (T)child;
        else
        {
            T childOfChild = FindVisualChild<T>(child);
            if (childOfChild != null)
                return childOfChild;
        }
    }
    return null;
}

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