public static SharpTreeViewTextSearch GetInstance(SharpTreeView sharpTreeView)
{
var textSearch = (SharpTreeViewTextSearch)sharpTreeView.GetValue(TextSearchInstanceProperty);
if (textSearch == null)
{
textSearch = new SharpTreeViewTextSearch(sharpTreeView);
sharpTreeView.SetValue(TextSearchInstanceProperty, textSearch);
}
return(textSearch);
}
protected override void OnTextInput(TextInputEventArgs e)
{
if (!string.IsNullOrEmpty(e.Text) && IsTextSearchEnabled && (e.Source == this || ItemContainerGenerator.IndexFromContainer(e.Source as IControl) != -1))
{
var instance = SharpTreeViewTextSearch.GetInstance(this);
if (instance != null)
{
instance.Search(e.Text);
e.Handled = true;
}
}
if (!e.Handled)
{
base.OnTextInput(e);
}
}
protected override void OnKeyDown(KeyEventArgs e)
{
SharpTreeViewItem container = e.Source as SharpTreeViewItem;
switch (e.Key)
{
case Key.Left:
if (container != null && ItemContainerGenerator.IndexFromContainer(e.Source as IControl) != -1)
{
if (container.Node.IsExpanded)
{
container.Node.IsExpanded = false;
}
else if (container.Node.Parent != null)
{
this.FocusNode(container.Node.Parent);
}
e.Handled = true;
}
break;
case Key.Right:
// TODO: focus on first child
if (container != null && ItemContainerGenerator.IndexFromContainer(e.Source as IControl) != -1)
{
if (!container.Node.IsExpanded && container.Node.ShowExpander)
{
container.Node.IsExpanded = true;
}
else if (container.Node.Children.Count > 0)
{
// jump to first child:
//container.MoveFocus(new TraversalRequest(FocusNavigationDirection.Down));
}
e.Handled = true;
}
break;
case Key.Return:
case Key.Space:
if (container != null && e.Modifiers == InputModifiers.None && this.SelectedItems.Count == 1 && this.SelectedItem == container.Node)
{
container.Node.ActivateItem(e);
}
break;
case Key.Add:
if (container != null && ItemContainerGenerator.IndexFromContainer(e.Source as IControl) != -1)
{
container.Node.IsExpanded = true;
e.Handled = true;
}
break;
case Key.Subtract:
if (container != null && ItemContainerGenerator.IndexFromContainer(e.Source as IControl) != -1)
{
container.Node.IsExpanded = false;
e.Handled = true;
}
break;
case Key.Multiply:
if (container != null && ItemContainerGenerator.IndexFromContainer(e.Source as IControl) != -1)
{
container.Node.IsExpanded = true;
ExpandRecursively(container.Node);
e.Handled = true;
}
break;
case Key.Back:
if (IsTextSearchEnabled)
{
var instance = SharpTreeViewTextSearch.GetInstance(this);
if (instance != null)
{
instance.RevertLastCharacter();
e.Handled = true;
}
}
break;
}
if (!e.Handled)
{
base.OnKeyDown(e);
}
}