/// <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;
}
internal void CleanupMultiSelects()
{
foreach (var item in MultiSelects.ToList())
{
if (!item.IsSelected)
{
item.IsMultiSelected = false;
if (item == SelectionStart)
SelectionStart = null;
}
}
}