public override bool CanMoveLinkTarget(DesignerItem source, DesignerItem target, DesignerItem newTarget)
{
string sourceName = source.Renderer.Text;
string targetName = target.Renderer.Text;
string newTargetName = newTarget.Renderer.Text;
if (targetName.Equals(newTargetName))
{
return(true);
}
string title = "Unable to move link";
string message = "Unable to move link from : " + targetName + " to : " + newTargetName + ".";
if (source.Tag == null || target.Tag == null || newTarget.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 newTargetTag = (TransformationTreeItem)newTarget.Tag;
if (newTargetTag.parent != null)
{
message = message + "\n" + newTargetName + " already has a parent.";
Kernel.Util.MessageDisplayer.DisplayError(title, message);
return(false);
}
if (sourceTag.parent != null)
{
foreach (TransformationTreeItem item in newTargetTag.GetDescendentsTree())
{
if (item.name.Equals(sourceTag.name))
{
message = message + "\n" + "Unable to build cyclic model.";
Kernel.Util.MessageDisplayer.DisplayError(title, message);
return(false);
}
}
}
return(true);
}
