在DataGridCell的CellEditingTemplate寻找一个TextBox [英] Finding a TextBox in a DataGridCell's CellEditingTemplate
问题描述
我在WPF的问题编程访问在DataGridTemplateColumn.CellEditingTemplate一个文本框,当细胞被选中,并在编辑模式。
I have a problem in WPF of programatically accessing a textbox in a DataGridTemplateColumn.CellEditingTemplate, when the cell is selected and in editing mode.
下面是的XAML我的DataGrid:
Here is the XAML of my DataGrid:
<DataGrid x:Name="OrderLinesGrid"
Style="{StaticResource DataGridStyle}"
SelectionMode="Single"
SelectionUnit="Cell"
ItemsSource="{Binding OrderLines}">
<DataGrid.Columns>
<DataGridTemplateColumn x:Name="NumberColumn"
Header="Varenr."
MinWidth="100">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Number}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox Text="{Binding Number}" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
我如何访问文本框时,选定的单元格?下面是该数据网格的可视化树一个形象,如果能够帮助你:
How can I access that TextBox when the cell is selected? Here is a image showing the visual tree of the DataGrid if that can help you:
我已经试过了DataGridCell GotFocus事件以下,但没有运气。它只是因为它是没有找到返回NULL。
I have tried the following in a DataGridCell GotFocus event, but without luck. It simply returns NULL because it is not found.
private void DataGridCellGotFocus(object sender, RoutedEventArgs e)
{
var cell = sender as DataGridCell;
var textBox = FindChild<TextBox>(cell, null);
}
当FindChild方法如下:
Where the FindChild method is the following:
/// <summary>
/// Finds a Child of a given item in the visual tree.
/// </summary>
/// <param name="parent">A direct parent of the queried item.</param>
/// <typeparam name="T">The type of the queried item.</typeparam>
/// <param name="childName">x:Name or Name of child. </param>
/// <returns>The first parent item that matches the submitted type parameter.
/// If not matching item can be found,
/// a null parent is being returned.</returns>
public static T FindChild<T>(DependencyObject parent, string childName)
where T : DependencyObject
{
// Confirm parent and childName are 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;
}
我怀疑它做的DataTemplate中,但我对需要一些建议如何选择文本框的子元素?
I suspect it has something to do with the DataTemplate but I need some suggestions on how to select the TextBox child element?
推荐答案
我觉得你应该避免使用 VisualTreeHelper
尽可能。如果我的理解,你可以封装在 CellEditingCommand
I think you you should avoid using VisualTreeHelper
as much as possible. If i understood, you can encapsulate your login within CellEditingCommand
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox Text="{Binding Number}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="GotFocus">
<i:InvokeCommandAction Command="{Binding CellEditingCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
您也可以使用的行为
UPD :
<DataTemplate>
<TextBox Text="{Binding Number}">
<Interactivity:Interaction.Triggers>
<Interactivity:EventTrigger EventName="Loaded">
<TriggerActions:TakeFocusAction />
</Interactivity:EventTrigger>
</Interactivity:Interaction.Triggers>
</TextBox>
</DataTemplate>
和触发动作
public class TakeFocusAction : TriggerAction<UIElement>
{
protected override void Invoke(object parameter)
{
AssociatedObject.Focus();
}
}
这篇关于在DataGridCell的CellEditingTemplate寻找一个TextBox的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!