bool ChangeContainerIfPossible(Point p)
{
DesignPanelHitTestResult result = HitTestUnselectedModel(p);
if (result.ModelHit == null)
{
return(false);
}
if (result.ModelHit == operation.CurrentContainer)
{
return(false);
}
// check that we don't move an item into itself:
DesignItem tmp = result.ModelHit;
while (tmp != null)
{
if (tmp == clickedOn)
{
return(false);
}
tmp = tmp.Parent;
}
IPlacementBehavior b = result.ModelHit.GetBehavior <IPlacementBehavior>();
if (b != null && b.CanEnterContainer(operation, false))
{
operation.ChangeContainer(result.ModelHit);
return(true);
}
return(false);
}