static void OnSelectionModeChanged(object sender, DependencyPropertyChangedEventArgs e)
{
var TreeView = sender as TreeView;
if ((TreeViewSelectionMode)e.NewValue == TreeViewSelectionMode.Single)
{
var SelectedItems = TreeViewExtensions.GetSelectedItems(TreeView);
if (SelectedItems != null && SelectedItems.Count > 1)
{
TreeView.SelectItem(TreeView.ItemContainerGenerator.ContainerFromItem(SelectedItems[0]).As <TreeViewItem>());
}
}
}
/// <summary>
///
/// </summary>
/// <param name="TreeView"></param>
/// <param name="TreeViewItem"></param>
public static void SelectItemsRandomly(this TreeView TreeView, TreeViewItem TreeViewItem)
{
TreeViewItemExtensions.SetIsSelected(TreeViewItem, !TreeViewItemExtensions.GetIsSelected(TreeViewItem));
if (TreeViewExtensions.GetStartItem(TreeView) == null || Keyboard.Modifiers == ModifierKeys.Control)
{
if (TreeViewItemExtensions.GetIsSelected(TreeViewItem))
{
TreeViewExtensions.SetStartItem(TreeView, TreeViewItem);
}
}
else
{
if (TreeViewExtensions.GetSelectedItems(TreeView).Count == 0)
{
TreeViewExtensions.SetStartItem(TreeView, null);
}
}
}
static void OnIsSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var TreeViewItem = d as TreeViewItem;
var TreeView = TreeViewItem.GetVisualParent <TreeView>();
if (TreeViewItem != null && TreeView != null)
{
var SelectedItems = TreeViewExtensions.GetSelectedItems(TreeView);
if (SelectedItems != null)
{
if (GetIsSelected(TreeViewItem))
{
SelectedItems.Add(TreeViewItem.DataContext);
}
else
{
SelectedItems.Remove(TreeViewItem.DataContext);
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="TreeView"></param>
/// <param name="TreeViewItem"></param>
/// <param name="ShiftControl"></param>
public static void SelectItemsContinuously(this TreeView TreeView, TreeViewItem TreeViewItem, bool ShiftControl = false)
{
var StartItem = TreeViewExtensions.GetStartItem(TreeView);
if (StartItem != null)
{
if (StartItem == TreeViewItem)
{
SelectItem(TreeView, TreeViewItem);
return;
}
var AllItems = new List <TreeViewItem>();
GetAllItems(TreeView, AllItems);
bool IsBetween = false;
foreach (var Item in AllItems)
{
if (Item == TreeViewItem || Item == StartItem)
{
//Toggle to true if first element is found and back to false if last element is found
IsBetween = !IsBetween;
//Set boundary element
TreeViewItemExtensions.SetIsSelected(Item, true);
continue;
}
if (IsBetween)
{
TreeViewItemExtensions.SetIsSelected(Item, true);
continue;
}
if (!ShiftControl)
{
TreeViewItemExtensions.SetIsSelected(Item, false);
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="TreeView"></param>
/// <param name="Item"></param>
public static void SelectItem(this TreeView TreeView, TreeViewItem Item)
{
SelectNone(TreeView);
TreeViewItemExtensions.SetIsSelected(Item, true);
TreeViewExtensions.SetStartItem(TreeView, Item);
}