我在WPF中有一个数据网格,带有DataGridTextColum和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>
CellTemplateSelectors 返回一个带有 TextBlock 的数据模板,用于单元格模板或用于单元格编辑的文本框!
<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 获得焦点时自动聚焦文本框。用户应该能够编辑文本框内容,而无需双击单元格。
我找到了这篇文章:
DataGrid 提示和技巧:单击编辑我可以在哪里获取当前数据网格单元,但是如何访问内容以使文本框具有编辑内容的焦点?
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:
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
}
如何使用该事件处理程序获取文本框?
似乎有效:
<DataGrid ItemsSource="{Binding Items}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTemplateColumn>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"></TextBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
这种方法对我有用。它使用的事实,即DataGrid
将始终在编辑开始时创建模板的新实例:
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox Text="{Binding MyProperty}"
Loaded="TextBox_Loaded"></TextBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
在后面的代码中:
private void TextBox_Loaded(object sender, RoutedEventArgs e)
{
((TextBox)sender).Focus();
((TextBox)sender).SelectAll();
}
作为额外的好处,它还选择单元格中的所有文本。无论您如何进入编辑模式(双击,单击,按F2),它都应该有效
我做到了,不是最好的解决方案,但它有效......当Cell获得焦点时,我将其设置为编辑模式。
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,我搜索视觉子项并给出焦点。
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();
}
}
}
}
寻找视觉儿童!
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;
}
派生自DataGrid控件的新控件的简单答案
using System.Windows.Controls;
public class CustomDataGrid : DataGrid
{
protected override void OnSelectedCellsChanged(SelectedCellsChangedEventArgs e)
{
//to make sure cell is selected
var cells = e.AddedCells.FirstOrDefault();
if (cells != null)
{
this.BeginEdit();
}
base.OnSelectedCellsChanged(e);
}
}
Hisham 的建议对我来说非常有效,但我会改用OnCurrentCellChanged
,因为当SelectionUnit
CellOrRowHeader
时OnSelectedCellsChanged
不起作用。在后一种情况下,仅当所选内容移动到另一行中的单元格时,才会触发BeginEdit()
。向左或向右踩踏根本不会触发事件。
此外,建议将 DependencyProperty 添加到自定义控件并在触发 BeginEdit()
之前对其进行检查,以防止此行为(如其他 DataGrids,如 XCeed)。但这不是批评家 - 只是我通常做的事情。
protected override void OnCurrentCellChanged(EventArgs e)
{
// Make sure a cell is selected and only enter edit mode
// if this is the desired behavior
if (CurrentCell != null && EditTrigger == EditTriggers.CellsCurrent)
{
this.BeginEdit();
}
base.OnCurrentCellChanged(e);
}