public static int GetSelectedItemIndexAtPosition(ListBox listBox, GetPositionFromInputElementDelegate getPosition)
{
var index = -1;
if (listBox?.Items != null)
{
for (int i = 0; i < listBox.Items.Count; ++i)
{
if (listBox.SelectedItems.IndexOf(listBox.Items[i]) == -1)
{
continue;
}
var listViewItem = getListViewItem(listBox, i);
if (VisualTreeHelperTools.IsMouseOverTarget(listViewItem, getPosition))
{
index = i;
break;
}
}
}
return(index);
}
public static bool IsMouseOverTarget(Visual target, GetPositionFromInputElementDelegate getPosition)
{
// It can happen that target is null
if (target == null)
{
return(false);
}
var bounds = VisualTreeHelper.GetDescendantBounds(target);
var mousePos = getPosition((IInputElement)target);
return(bounds.Contains(mousePos));
}
/// <summary>
/// The list will never be null but empty.
/// </summary>
public static List <T> GetSelectedItemsAtPosition <T>(ListBox listBox, GetPositionFromInputElementDelegate getPosition)
{
var selectedItems = new List <T>();
var itemIndexAtPosition = GetSelectedItemIndexAtPosition(listBox, getPosition);
// When mouse is over one item that is selected then we can return all selected items.
if (itemIndexAtPosition >= 0)
{
selectedItems.AddRange(listBox.SelectedItems.OfType <T>());
}
return(selectedItems);
}
