/// <summary>
/// Selects the specified item.
/// </summary>
/// <param name="treeViewItem">The item.</param>
/// <param name="unselectOthers">if set to <c>true</c> [unselect other items].</param>
public void Select(VirtualTreeViewItem treeViewItem, bool unselectOthers)
{
if (SelectionMode == VirtualTreeViewSelectionMode.None)
{
return;
}
var item = ItemContainerGenerator.ItemFromContainer(treeViewItem);
// remove other items
if (unselectOthers || SelectionMode == VirtualTreeViewSelectionMode.Single)
{
var otherSelection = SelectedItems.Where(s => !ReferenceEquals(s, item)).ToArray();
foreach (var o in otherSelection)
{
SelectedItems.Remove(o);
}
}
if (IsKeyboardFocusWithin && !treeViewItem.IsKeyboardFocusWithin)
{
treeViewItem.Focus();
}
if (!SelectedItems.Contains(item))
{
SelectedItems.Add(item);
}
treeViewItem.IsSelected = true;
}
/// <summary>
/// Gets the depth of the given item.
/// This is used by binding generated items
/// </summary>
/// <param name="treeViewItem">The tree view item.</param>
/// <returns></returns>
private int GetDepth(VirtualTreeViewItem treeViewItem)
{
int depth = -1; // starting from -1 here, cause the dataContext below will be non-null at least once
for (var dataContext = treeViewItem.DataContext; dataContext != null; dataContext = FlatItemsSource.GetParent(dataContext))
{
depth++;
}
return(depth);
}
/// <summary>
/// Deselects the specified item.
/// </summary>
/// <param name="treeViewItem">The item.</param>
public void Deselect(VirtualTreeViewItem treeViewItem)
{
if (!treeViewItem.IsSelected)
{
return;
}
var item = ItemContainerGenerator.ItemFromContainer(treeViewItem);
SelectedItems.Remove(item);
treeViewItem.IsSelected = false;
}