public override bool CanMoveLinkSource(DesignerItem source, DesignerItem target, DesignerItem newSource)
{
string sourceName = source.Renderer.Text;
string targetName = target.Renderer.Text;
string newSourceName = newSource.Renderer.Text;
if (sourceName.Equals(newSourceName))
{
return(true);
}
string title = "Unable to move link";
string message = "Unable to move link from : " + sourceName + " to : " + newSourceName + ".";
if (source.Tag == null || target.Tag == null || newSource.Tag == null)
{
message = message + "\n" + "Source or Target Entity is null!";
Kernel.Util.MessageDisplayer.DisplayError(title, message);
return(false);
}
TransformationTreeItem sourceTag = (TransformationTreeItem)source.Tag;
TransformationTreeItem targetTag = (TransformationTreeItem)target.Tag;
TransformationTreeItem newSourceTag = (TransformationTreeItem)newSource.Tag;
if (newSourceTag.childrenListChangeHandler.Items.Count > 0)
{
message = message + "\n" + newSourceName + " already has a child.";
Kernel.Util.MessageDisplayer.DisplayError(title, message);
return(false);
}
if (targetTag.parent != null)
{
foreach (TransformationTreeItem item in newSourceTag.GetAscendentsTree())
{
if (item.name.Equals(targetTag.name))
{
message = message + "\n" + "Unable to build cyclic model.";
Kernel.Util.MessageDisplayer.DisplayError(title, message);
return(false);
}
}
}
return(true);
}
