public bool SelectLastFromKey()
{
List <MultiSelectTreeViewItem> items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
MultiSelectTreeViewItem item = treeView.GetLastItem(items);
return(SelectFromKey(item));
}
public bool SelectPreviousFromKey()
{
List <MultiSelectTreeViewItem> items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
MultiSelectTreeViewItem item = treeView.GetPreviousItem(GetFocusedItem(), items);
return(SelectFromKey(item));
}
public void ApplyTemplate()
{
borderSelectionLogic = new BorderSelectionLogic(
treeView,
treeView.Template.FindName("selectionBorder", treeView) as Border,
treeView.Template.FindName("scrollViewer", treeView) as ScrollViewer,
treeView.Template.FindName("content", treeView) as ItemsPresenter,
MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false));
}
private MultiSelectTreeViewItem GetFocusedItem()
{
foreach (var item in MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false))
{
if (item.IsFocused)
{
return(item);
}
}
return(null);
}
private bool SelectPageUpDown(bool down)
{
List <MultiSelectTreeViewItem> items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
MultiSelectTreeViewItem item = GetFocusedItem();
if (item == null)
{
return(down ? SelectLastFromKey() : SelectFirstFromKey());
}
double targetY = item.TransformToAncestor(treeView).Transform(new Point()).Y;
FrameworkElement itemContent = (FrameworkElement)item.Template.FindName("PART_Header", item);
if (itemContent == null)
{
return(down ? SelectLastFromKey() : SelectFirstFromKey());
}
double offset = treeView.ActualHeight - 2 * ((FrameworkElement)itemContent.Parent).ActualHeight;
if (!down)
{
offset = -offset;
}
targetY += offset;
while (true)
{
var newItem = down ? treeView.GetNextItem(item, items) : treeView.GetPreviousItem(item, items);
if (newItem == null)
{
break;
}
item = newItem;
double itemY = item.TransformToAncestor(treeView).Transform(new Point()).Y;
if (down && itemY > targetY ||
!down && itemY < targetY)
{
break;
}
}
return(SelectFromKey(item));
}
public bool SelectAllFromKey()
{
var items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
// Add new selected items
foreach (var item in items.Where(i => !treeView.SelectedItems.Contains(i.DataContext)))
{
var e = new PreviewSelectionChangedEventArgs(true, item.DataContext);
OnPreviewSelectionChanged(e);
if (e.CancelAll)
{
return(false);
}
if (!e.CancelThis)
{
treeView.SelectedItems.Add(item.DataContext);
}
}
return(true);
}
