public void DisplayInsertIndicator(Card source, int idx)
{
// If the index corresponds to the card being dragged, it's a NOP so don't provide any visual feedback
if (idx < Children.Count)
{
if (((FrameworkElement)Children[idx]).DataContext == source)
{ HideInsertIndicator(); return; }
if (idx > 0 && ((FrameworkElement)Children[idx - 1]).DataContext == source)
{ HideInsertIndicator(); return; }
}
// Create an adorner if it doesn't exist yet
if (insertAdorner == null)
{
insertAdorner = new InsertAdorner(this);
var layer = AdornerLayer.GetAdornerLayer(this);
layer.Add(insertAdorner);
}
// Position the insert adorner correctly
insertAdorner.MoveTo(new Point(idx * itemSkipSize, 0));
// Cancel previous spacing
CancelSpacing();
// Space neighbors
if (idx < Children.Count)
{
spacedItem2 = Children[idx];
SetSpacing(spacedItem2, SpacingWidth);
if (idx > 0)
{
spacedItem1 = Children[idx - 1];
SetSpacing(spacedItem1, -SpacingWidth);
}
}
}
public void HideInsertIndicator()
{
if (insertAdorner == null) return;
var layer = AdornerLayer.GetAdornerLayer(this);
layer.Remove(insertAdorner);
insertAdorner = null;
CancelSpacing();
}