我想在我的Silverlight DataGrid中添加一个新行,当用户尝试通过Tab / Enter从LastRow转到NextRow时(因为它的最后一行,DataGrid失去焦点)。我不能使用RowEditEnded事件,因为它会触发,即使我从LastRow移动到PreviousRow。
任何人都可以帮助我实现这个目标吗?
答案 0 :(得分:4)
如果查看DataGrid源代码,您可以看到它捕获按键事件(f.i.以实现功能,例如按Enter键进入下一行)。作为解决方案,我建议实现从DataGrid继承的自己的网格,并添加当用户按下enter(或其他)按钮时引发的事件。自己控制:
public class MyDataGrid : DataGrid
{
public event EventHandler OnLastRowEnterPressed;
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
if (ItemsSource != null
&& ItemsSource.Cast<object>().Count() - 1 == SelectedIndex
&& e.Key == Key.Enter)
{
RaiseLastRowEnterPressed();
}
}
private void RaiseLastRowEnterPressed()
{
if (OnLastRowEnterPressed != null)
OnLastRowEnterPressed(this, EventArgs.Empty);
}
}
使用:
ObservableCollection<Foo> source = new ObservableCollection<Foo>()
{
new Foo(), new Foo(), new Foo(),
};
myDataGrid.OnLastRowEnterPressed += (s, e) => source.Add(new Foo());
myDataGrid.ItemsSource = source;
答案 1 :(得分:1)
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
addFlag = (e.Key == Key.Tab);
}
protected override void OnLostFocus(RoutedEventArgs e)
{
addFlag = (addFlag && true);
base.OnLostFocus(e);
}
protected override void OnRowEditEnded(DataGridRowEditEndedEventArgs e)
{
base.OnRowEditEnded(e);
addFlag = (addFlag && IsLastRowSelected);
if (addFlag)
AddItem();
addFlag = false;
}
protected override void OnKeyUp(KeyEventArgs e)
{
base.OnKeyUp(e);
addFlag = false;
}
protected override void OnSelectionChanged(SelectionChangedEventArgs e)
{
base.OnSelectionChanged(e);
addFlag = false;
}
private void AddItem()
{
if (RaiseAddEvent!= null)
{
this.Focus();
RaiseAddEvent(this, EventArgs.Empty);
this.UpdateLayout();
this.CurrentColumn = this.Columns[0];
this.BeginEdit();
}
}
答案 2 :(得分:0)
您可以使用路由事件概念捕获Enter / Tab键,您可以向数据网格控件添加新行。
答案 3 :(得分:0)
我将通过几个步骤揭露。所以现在就开始..
1)在此类的构造函数中声明您的事件。
this.DataGrid1.KeyDown += new KeyEventHandler(DataGrid1_KeyDown);
you also can it in XAML file.
...KeyDown="DataGrid1_KeyDown".....
2)去你的keydown活动&amp;代码。
var focusedElement = FocusManager.GetFocusedElement();
DataGrid detailsDataGrid = sender as DataGrid;
int dataGridrows = detailsDataGrid.ItemsSource.OfType<object>().Count();
if (e.Key == Key.Tab && (Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift)
return;
if (e.Key == Key.Tab)
try
{
detailsDataGrid.SelectedIndex = row.GetIndex();
{
itemMaster.TransactionChilds.Add(transactionChild);
detailsDataGrid.SelectedItem = transactionChild;
}
}
3)现在逐行编码..
DataGridRow row = DataGridRow.GetRowContainingElement(focusedElement as FrameworkElement);
DataGridColumn column = DataGridColumn.GetColumnContainingElement(focusedElement as FrameworkElement);
TransactionMaster itemMaster = this.DataFormVoucher.CurrentItem as TransactionMaster;
decimal serialNumber = 0;
if (buttonPress == "Modify")
if (dataGridrows - 1 == detailsDataGrid.SelectedIndex && column.DisplayIndex == 5)
TransactionChild transactionChild = new TransactionChild()"[None]",DateTime.Now.Date,catch (Exception ex)Console.WriteLine(ex.Message);
.DataGridChild.KeyDown += new KeyEventHandler(DataGridChild_KeyDown);
3)现在逐行理解代码
i)前3行用于选择数据网格的哪一行。
ii)当在这种情况下添加新行时我已经使用Tab键你也可以改变它。另外一件事是如果用户预先Tab + Shift然后它将通过(默认为控制焦点)。
iii)然后检查它是最后一行&amp;该网格的最后一列,如果是,则添加新行。否则。
iv)添加一个空白的新行只需传递你的对象(EDMX模型表)