private void SelectWithShift(TreeViewExItem item)
{
object firstSelectedItem;
if (lastShiftRoot != null)
{
firstSelectedItem = lastShiftRoot;
}
else
{
// Get the first item in the SelectedItems that is also bound to the Tree.
firstSelectedItem = treeViewEx.SelectedItems.Cast <object>().FirstOrDefault((x) => { return(treeViewEx.GetTreeViewItemFor(x) != null); });
}
if (firstSelectedItem != null)
{
TreeViewExItem shiftRootItem = treeViewEx.GetTreeViewItemsFor(new List <object> {
firstSelectedItem
}).First();
List <object> itemsToSelect = treeViewEx.GetNodesToSelectBetween(shiftRootItem, item).Select(x => x.DataContext).ToList();
List <object> itemsToUnSelect = treeViewEx.SelectedItems.Cast <object>().ToList();
ModifySelection(itemsToSelect, itemsToUnSelect);
}
else
{ // Fall-back to sigle selection
List <object> itemsToUnSelect = treeViewEx.SelectedItems.Cast <object>().ToList();
if (itemsToUnSelect.Contains(item.DataContext))
{
itemsToUnSelect.Remove(item.DataContext);
}
ModifySelection(item.DataContext, itemsToUnSelect);
}
}
private void SelectWithShift(TreeViewExItem item)
{
object firstSelectedItem;
if (lastShiftRoot != null)
{
firstSelectedItem = lastShiftRoot;
}
else
{
if (treeViewEx.SelectedItems.Count > 0)
{
firstSelectedItem = treeViewEx.SelectedItems[0];
}
else
{
firstSelectedItem = null;
}
}
TreeViewExItem shiftRootItem = treeViewEx.GetTreeViewItemsFor(new List <object> {
firstSelectedItem
}).First();
List <object> itemsToSelect = treeViewEx.GetNodesToSelectBetween(shiftRootItem, item).Select(x => x.DataContext).ToList();
List <object> itemsToUnSelect = ((IEnumerable <object>)treeViewEx.SelectedItems).ToList();
ModifySelection(itemsToSelect, itemsToUnSelect);
}
private void SelectCore(TreeViewExItem item)
{
if (IsControlKeyDown)
{
if (!treeViewEx.CheckSelectionAllowed(item.DataContext, true))
{
return;
}
if (treeViewEx.SelectedItems.Contains(item.DataContext))
{
throw new InvalidOperationException("The item must not be contained.");
}
treeViewEx.SelectedItems.Add(item.DataContext);
item.IsSelected = true;
lastShiftRoot = item.DataContext;
}
else if (IsShiftKeyDown && treeViewEx.SelectedItems.Count > 0)
{
object firstSelectedItem = lastShiftRoot ?? treeViewEx.SelectedItems.First();
TreeViewExItem shiftRootItem = treeViewEx.GetTreeViewItemsFor(new List <object> {
firstSelectedItem
}).First();
IEnumerable <object> items = treeViewEx.GetNodesToSelectBetween(shiftRootItem, item).Select(x => x.DataContext);
IEnumerable <object> itemsToSelect = GetItemsNotInCollection((IEnumerable <object>)treeViewEx.SelectedItems, items);
IEnumerable <object> itemsToUnSelect = GetItemsNotInCollection(items, (IEnumerable <object>)treeViewEx.SelectedItems);
if (!treeViewEx.CheckSelectionAllowed(itemsToSelect, itemsToUnSelect))
{
return;
}
treeViewEx.SelectedItems.Clear();
foreach (var node in TreeViewEx.RecursiveTreeViewItemEnumerable(treeViewEx, false))
{
if (items.Contains(node.DataContext))
{
treeViewEx.SelectedItems.Add(node.DataContext);
node.IsSelected = true;
}
else
{
node.IsSelected = false;
}
}
}
else
{
if (!treeViewEx.CheckSelectionAllowed(item.DataContext, true))
{
return;
}
// check if selection is already item, otherwise set it
if (!(treeViewEx.SelectedItems.Count == 1 && treeViewEx.SelectedItems[0] == item.DataContext))
{
foreach (var treeViewItem in TreeViewEx.RecursiveTreeViewItemEnumerable(treeViewEx, false))
{
treeViewItem.IsSelected = false;
}
treeViewEx.SelectedItems.Clear();
treeViewEx.SelectedItems.Add(item.DataContext);
}
lastShiftRoot = item.DataContext;
}
FocusHelper.Focus(item);
}
