private static void MoveElementInsideTree(DataTreeView target, BranchView branchItem)
{
if (target.Tree.Children.Count == 0)
{
return;
}
if (branchItem.Element.DataStructure == null)
{
Debug.Write("Can not remove datapoints, only datastructures");
return;
}
var ix = target.Tree.Children.IndexOf(branchItem.Element.DataStructure);
if (ix != -1)
{
if (ix == target.Tree.Children.Count - 1)
{
return;
}
target.Tree.Children.Move(ix, target.Tree.Children.Count - 1);
return;
}
var branchParent = XamarinHelpers.GetTypedElementFromParents <BranchView>(branchItem.Parent);
branchParent.Element.DataStructure.Children.Remove(branchItem.Element.DataStructure);
target.Tree.Children.Add(branchItem.Element.DataStructure);
}
private static bool IsOwnParent(BranchView target, BranchView item)
{
var parent = XamarinHelpers.GetTypedElementFromParents <BranchView>(target.Parent);
while (parent != null)
{
if (parent == item)
{
return(true);
}
parent = XamarinHelpers.GetTypedElementFromParents <BranchView>(parent.Parent);
}
return(false);
}
private static void MoveElementInsideTree(BranchView target, BranchView item)
{
if (target.Element.DataPoint != null || item.Element.DataPoint != null)
{
Debug.WriteLine("Reordering of data points not implemented yet");
return;
}
if (IsOwnParent(target, item))
{
Debug.WriteLine("You shouldn't become your own grandmother.");
return;
}
// If immediate element of parent, move to top
if (target.Element.DataStructure.Children.Contains(item.Element.DataStructure))
{
var ix = target.Element.DataStructure.Children.IndexOf(item.Element.DataStructure);
if (ix == 0)
{
return;
}
target.Element.DataStructure.Children.Move(ix, 0);
return;
}
var parent = XamarinHelpers.GetTypedElementFromParents <BranchView>(item.Parent);
if (parent != null)
{
parent.Element.DataStructure.Children.Remove(item.Element.DataStructure);
}
else
{
var treeParent = XamarinHelpers.GetTypedElementFromParents <DataTreeView>(item.Parent);
if (treeParent == null)
{
Debug.WriteLine("Unknown parent");
return;
}
treeParent.Tree.Children.Remove(item.Element.DataStructure);
}
target.Element.DataStructure.Children.Add(item.Element.DataStructure);
}
