private void UpdateDropArea(ListBoxItem item, DragEventArgs e)
{
var itemContent = item.FindChild <Grid>(ItemContentContainer);
double mousePointY = e.GetPosition(itemContent).Y;
double itemCenter = itemContent.ActualHeight / 2;
var activeDropArea =
item.FindChild <Rectangle>(mousePointY <= itemCenter ? DropAreaTopName : DropAreaBottomName);
if (!Equals(dropAreaOpen, activeDropArea))
{
dropAreaOpen.Visibility = Visibility.Collapsed;
activeDropArea.Visibility = Visibility.Visible;
dropAreaOpen = activeDropArea;
}
//else if (!Equals(dropAreaOpen, activeDropArea))
//{
// dropAreaOpen.Visibility = Visibility.Collapsed;
// activeDropArea.Visibility = Visibility.Visible;
// dropAreaOpen = activeDropArea;
//}
}
private void OpenDropArea(ListBoxItem item, DragEventArgs e)
{
var itemContent = item.FindChild <Grid>(ItemContentContainer);
double mousePointY = e.GetPosition(itemContent).Y;
double itemCenter = itemContent.ActualHeight / 2;
// set active drop area
var activeDropArea =
item.FindChild <Rectangle>(mousePointY <= itemCenter ? DropAreaTopName : DropAreaBottomName);
if (dropAreaOpen != null)
{
dropAreaOpen.Visibility = Visibility.Collapsed;
}
activeDropArea.Visibility = Visibility.Visible;
dropAreaOpen = activeDropArea;
}
private void InitializeDragAdorner(Point startPosition)
{
if (adorner != null)
{
return;
}
if (draggedItem == null)
{
return;
}
var contentContainer = draggedItem.FindChild <Grid>(ItemContentContainer);
adorner = new DragAdorner(AssociatedObject, contentContainer, true, 1);
var adornerLayer = AdornerLayer.GetAdornerLayer(AssociatedObject);
adornerLayer.Add(adorner);
adorner.UpdatePosition(startPosition);
}
private static ListBoxItem GetLastDeepestChild(ListBoxItem listBoxItem)
{
ListBox box = listBoxItem.FindChild <ListBox>();
if (box == null)
{
return(listBoxItem);
}
if (box.Items.Count == 0)
{
return(listBoxItem);
}
var lastItem =
(ListBoxItem)box.ItemContainerGenerator.ContainerFromItem(box.Items[box.Items.Count - 1]);
return(GetLastDeepestChild(lastItem));
}
