/// <summary>
/// Generates a list of connector subitems.
/// </summary>
/// <param name="firstIndex">The first connector subitem found on the node.</param>
/// <returns>Returns alist of all connector subitems.</returns>
protected List <NodeViewData.SubItemConnector> CollectSubItems(out int firstIndex)
{
if (!(_connectedChildren.Owner is NodeViewData))
{
throw new Exception(Resources.ExceptionIsNotNodeViewData);
}
List <NodeViewData.SubItemConnector> list = new List <NodeViewData.SubItemConnector>();
firstIndex = -1;
NodeViewData nvd = (NodeViewData)_connectedChildren.Owner;
// for each subitem...
for (int i = 0; i < nvd.SubItems.Count; ++i)
{
// check if it is a connector subitem
NodeViewData.SubItemConnector subconn = nvd.SubItems[i] as NodeViewData.SubItemConnector;
if (subconn != null && subconn.Connector == this)
{
// remember the index of the first connector subitem found
if (firstIndex == -1)
{
firstIndex = i;
}
// add subitem to list
list.Add(subconn);
}
else
{
// subitems of a connector must be next to each other
if (firstIndex >= 0)
{
break;
}
}
}
// check if we have found any subitems
if (list.Count < 1)
{
throw new Exception(Resources.ExceptionNoSubItemForConnector);
}
// check that we have found enough of them and not too many
Debug.Check(list.Count >= _minCount && list.Count <= _maxCount);
return(list);
}
/// <summary>
/// Removes a connector subitem for a child.
/// </summary>
/// <param name="child">The child whose connector subitem we want to remove.</param>
protected void RemoveSubItem(BaseNode child)
{
if (!(_connectedChildren.Owner is NodeViewData))
{
throw new Exception(Resources.ExceptionIsNotNodeViewData);
}
int firstIndex;
List <NodeViewData.SubItemConnector> subitems = CollectSubItems(out firstIndex);
// find the connector subitem for this child...
for (int i = 0; i < subitems.Count; ++i)
{
NodeViewData.SubItemConnector subitem = subitems[i];
// when we found it...
if (subitem.Child == child)
{
// remove the subitem
((NodeViewData)_connectedChildren.Owner).RemoveSubItem(subitem);
// if we do not fullfil the minimum count, re add it at the end and clear the child
if (subitems.Count - 1 < _minCount)
{
subitem.Child = null;
((NodeViewData)_connectedChildren.Owner).AddSubItem(subitem, firstIndex + subitems.Count - 1);
}
// update stored indices on connector subitems
RebuildSubItemIndices();
return;
}
}
throw new Exception(Resources.ExceptionSubItemIsNoChild);
}
