private void HandleSingleSelection(TreeViewItem newSelectedItem)
{
ClearAllSelections();
newSelectedItem.IsSelected = true;
SelectedTreeViewItems.Add(newSelectedItem);
_lastSelectedItem = newSelectedItem;
}
private void ClearAllSelections()
{
while (SelectedTreeViewItems.Count > 0)
{
SelectedTreeViewItems[0].IsSelected = false;
SelectedTreeViewItems.RemoveAt(0);
}
}
private void RemoveDeselectedItemContainers()
{
for (int i = 0; i < SelectedTreeViewItems.Count; i++)
{
if (!SelectedTreeViewItems[i].IsSelected)
{
SelectedTreeViewItems.RemoveAt(i);
}
}
}
private void Deselect(object oldSelectedElement)
{
var container = GetContainerFromItem(this, oldSelectedElement);
if (container != null)
{
container.IsSelected = false;
if (Equals(container, _lastSelectedItem))
{
_lastSelectedItem = null;
}
SelectedTreeViewItems.Remove(container);
}
}
private void Select(TreeViewItem element)
{
if (element.IsSelected)
{
return;
}
element.IsSelected = true;
_lastSelectedItem = element;
SelectedTreeViewItems.Add(element);
element.BringIntoView();
if (AutoExpandSelected)
{
TryExpandTree(element);
}
}
private void HandleShiftKeySelection(TreeViewItem newSelectedItemContainer)
{
if (_lastSelectedItem != null)
{
ClearAllSelections();
var items = GetFlatTreeViewItems(this);
var firstItemPos = items.IndexOf(_lastSelectedItem);
var lastItemPos = items.IndexOf(newSelectedItemContainer);
Sort(ref firstItemPos, ref lastItemPos);
for (int i = firstItemPos; i <= lastItemPos; ++i)
{
items[i].IsSelected = true;
SelectedTreeViewItems.Add(items[i]);
}
}
}
private void HandleControlKeySelection(TreeViewItem newSelected)
{
if (SelectedTreeViewItems.Contains(newSelected))
{
newSelected.IsSelected = false;
SelectedTreeViewItems.Remove(newSelected);
if (_lastSelectedItem != null)
{
_lastSelectedItem.IsSelected = true;
}
_lastSelectedItem = null;
}
else
{
if (_lastSelectedItem != null)
{
_lastSelectedItem.IsSelected = true;
}
SelectedTreeViewItems.Add(newSelected);
_lastSelectedItem = newSelected;
}
}
