How to set focus to a brand new TextBox which was created as a result of a databinding in WPF?
- by Mike
Hi everyone,
I have a WPF ItemsControl that is bound to an ObservableCollection.
The XAML:
<ItemsControl Name="mItemsControl">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBox Text="{Binding Mode=OneWay}"></TextBox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
The codebehind:
private ObservableCollection<string> mCollection = new ObservableCollection<string>();
public MainWindow()
{
InitializeComponent();
this.mCollection.Add("Test1");
this.mCollection.Add("Test2");
this.mItemsControl.ItemsSource = this.mCollection;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
this.mCollection.Add("new item!");
}
When I click a button, it adds a new string to the databound ObservableCollection which triggers a new TextBox to appear. I want to give this new textbox focus.
I've tried this technique from a related StackOverflow question but it always sets focus to the textbox before the newly created one.
private void Button_Click(object sender, RoutedEventArgs e)
{
this.mCollection.Add("new item!");
// MoveFocus takes a TraversalRequest as its argument.
TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Previous);
// Gets the element with keyboard focus.
UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
// Change keyboard focus.
if (elementWithFocus != null)
{
elementWithFocus.MoveFocus(request);
}
}
My need seems simple enough, but it's almost like the new textbox doesn't really exist until a slight delay after something is added to the ObservableCollection.
Any ideas of what would work?
Thanks!
-Mike
