public override void DropElement(System.Windows.FrameworkElement element, LayoutItemInsertionPoint insertionPoint, LayoutItemInsertionKind insertionKind)
{
MyLayoutGroup elemPar = element.Parent as MyLayoutGroup;
bool IsSourceIsolated = false;
if (elemPar != null)
{
IsSourceIsolated = elemPar.IsIsolatedGroup;
}
bool IsTargetIsolated = false;
MyLayoutGroup targParent = insertionPoint.Element.Parent as MyLayoutGroup;
if (targParent != null)
{
IsTargetIsolated = targParent.IsIsolatedGroup;
}
if (element.Parent != null)
{
if (element.Parent != insertionPoint.Element.Parent && (IsSourceIsolated || IsTargetIsolated))
{
return;
}
}
if (element.Parent == null && IsTargetIsolated)
{
return;
}
base.DropElement(element, insertionPoint, insertionKind);
}
protected override FrameworkElement CreateNewItem(LayoutControlNewItemInfo itemInfo)
{
if (itemInfo.Data is MyNewItem)
{
MyLayoutGroup item = new MyLayoutGroup();
item.IsIsolatedGroup = true;
item.Header = itemInfo.Label;
item.View = LayoutGroupView.GroupBox;
InitNewItem(item);
return(item);
}
return(base.CreateNewItem(itemInfo));
}
protected override void OnInsertionInfoChanged()
{
MyLayoutGroup elemPar = OriginalParent as MyLayoutGroup;
bool IsSourceIsolated = false;
if (elemPar != null)
{
IsSourceIsolated = elemPar.IsIsolatedGroup;
}
bool IsTargetIsolated = false;
MyLayoutGroup targParent;
if (InsertionInfo.DestinationItem != null)
{
targParent = InsertionInfo.DestinationItem.Parent as MyLayoutGroup;
if (targParent != null)
{
IsTargetIsolated = targParent.IsIsolatedGroup;
}
}
if (OriginalParent != null && InsertionInfo.DestinationItem != null)
{
if (OriginalParent != InsertionInfo.DestinationItem.Parent && (IsSourceIsolated || IsTargetIsolated))
{
NoIndicator();
return;
}
}
if (OriginalParent == null && IsTargetIsolated)
{
NoIndicator();
return;
}
base.OnInsertionInfoChanged();
}