/// <summary>
/// This method starts with this legend item and tests to see if it can contain
/// the specified target. As it moves up the
/// </summary>
/// <param name="startItem">This legend item</param>
/// <param name="dropItem">The target legend item to test</param>
/// <returns>An ILegendItem that is one of the parent items of this item, but that can receive the target.</returns>
public static ILegendItem GetValidContainerFor(this ILegendItem startItem, ILegendItem dropItem)
{
if (startItem == null)
{
return(null);
}
if (dropItem == null)
{
return(null);
}
if (startItem.CanReceiveItem(dropItem))
{
return(startItem);
}
ILegendItem item = startItem;
while ((item = item.GetParentItem()) != null)
{
if (item.CanReceiveItem(dropItem))
{
return(item);
}
}
return(null);
}
private static ILegendItem GetInsertTarget(ILegendItem startItem, ILegendItem dropItem)
{
if (startItem == null)
{
return(null);
}
if (dropItem == null)
{
return(null);
}
if (startItem.CanReceiveItem(dropItem))
{
return(startItem);
}
ILegendItem item = startItem;
while (item.GetParentItem() != null)
{
if (item.GetParentItem().CanReceiveItem(dropItem))
{
return(item);
}
item = item.GetParentItem();
}
return(null);
}
private static ILegendItem GetInsertTarget(ILegendItem startItem, ILegendItem dropItem)
{
if (startItem == null) return null;
if (dropItem == null) return null;
if (startItem.CanReceiveItem(dropItem)) return startItem;
ILegendItem item = startItem;
while (item.GetParentItem() != null)
{
if (item.GetParentItem().CanReceiveItem(dropItem))
{
return item;
}
item = item.GetParentItem();
}
return null;
}
