/// <summary>
/// Selects everything between SelectionStart and the given item.
/// </summary>
internal void MultiSelectTo(TreeListViewItem to)
{
if (SelectionStart == null)
{
return;
}
var from = SelectionStart;
bool inRange = false;
foreach (var item in this.EnumerateItems(i => i.IsExpanded))
{
if (item == to || item == from)
{
if (inRange)
{
break;
}
else
{
inRange = true;
}
}
else if (inRange)
{
item.IsMultiSelected = true;
}
}
to.IsMultiSelected = true;
from.IsMultiSelected = true;
}
public static IEnumerable <TreeListViewItem> EnumerateChildren(this TreeListViewItem item,
Func <TreeListViewItem, bool> walkChildren)
{
foreach (var child in item.Items)
{
var tvi = (TreeListViewItem)item.ItemContainerGenerator.ContainerFromItem(child);
if (tvi != null)
{
yield return(tvi);
if (walkChildren(tvi))
{
foreach (var sub in EnumerateChildren(tvi, walkChildren))
{
yield return(sub);
}
}
}
}
}
