protected override void OnKeyUp(KeyEventArgs e)
{
base.OnKeyUp(e);
if (!e.Handled)
{
Key key = e.Key;
switch (key)
{
case Key.Left:
case Key.Right:
case Key.Up:
case Key.Down:
case Key.Add:
case Key.Subtract:
case Key.Space:
IEnumerable <TreeViewExItem> items = TreeViewEx.RecursiveTreeViewItemEnumerable(ParentTreeView, false);
TreeViewExItem focusedItem = items.Where <TreeViewExItem>(x => x.IsFocused).FirstOrDefault();
if (focusedItem != null)
{
focusedItem.BringIntoView(new Rect(1, 1, 1, 1));
}
break;
}
}
}
public void SelectLast()
{
TreeViewExItem item = TreeViewEx.RecursiveTreeViewItemEnumerable(treeViewEx, false).LastOrDefault();
if (item != null)
{
Select(item);
}
}
private TreeViewExItem GetFocusedItem()
{
foreach (var item in TreeViewEx.RecursiveTreeViewItemEnumerable(treeViewEx, false))
{
if (item.IsFocused)
{
return(item);
}
}
return(null);
}
public void SelectPreviousFromKey()
{
List <TreeViewExItem> items = TreeViewEx.RecursiveTreeViewItemEnumerable(treeViewEx, true).ToList();
TreeViewExItem item;
TreeViewExItem focusedItem = GetFocusedItem();
item = treeViewEx.GetPreviousItem(focusedItem, items);
if (item == null)
{
return;
}
// if ctrl is pressed just focus it, so it can be selected by space. Otherwise select it.
if (IsControlKeyDown)
{
FocusHelper.Focus(item);
}
else
{
SelectCore(item);
}
}
public void ApplyTemplate()
{
borderSelectionLogic = new BorderSelectionLogic(
treeViewEx,
TreeViewEx.RecursiveTreeViewItemEnumerable(treeViewEx, false));
}
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);
}
