protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (TryChangeSelectedItem(e))
{
e.Handled = true;
return;
}
if (IsDropDownOpen && e.Key == Key.Enter)
{
AddToSelectedItems(SelectedItem);
}
else if (!IsDropDownOpen && e.Key == Key.Back &&
string.IsNullOrEmpty(editableTextBox.Text))
{
RemoveFromSelectedItems(SelectedItems.LastOrDefault());
}
else if (!IsDropDownOpen && e.Key == Key.Space && Keyboard.Modifiers == ModifierKeys.Control)
{
IsDropDownOpen = true;
e.Handled = true;
return;
}
base.OnPreviewKeyDown(e);
}
private void SelectedItems_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add && e.NewItems != null)
{
foreach (var item in e.NewItems)
{
CurrentItem = (T)item;
}
}
else if (e.Action == NotifyCollectionChangedAction.Remove && e.OldItems != null)
{
CurrentItem = SelectedItems.LastOrDefault();
}
OnSelectedItemsChanged(e);
}
/// <inheritdoc />
protected override void SelectedContentCollectionChanged(NotifyCollectionChangedAction action)
{
base.SelectedContentCollectionChanged(action);
if (action == NotifyCollectionChangedAction.Reset)
{
Controller.AdornerService.ClearSelection().Forget();
return;
}
LastSelectedElement = SelectedItems.LastOrDefault();
if (LastSelectedElement != null)
{
// Update active root
ActiveRoot = LastSelectedElement.GetRootElementViewModel();
}
if (ActiveRoot != null)
{
// Select adorners (for the active root only)
var elements = SelectedItems.Where(e => e.AssetSideUIElement.FindVisualRoot().Id == ActiveRoot.Id.ObjectId);
elements.ForEach(e => e.SelectAdorner().Forget());
}
}