//FindItem skips over itemless nodes.
public int FindItem(object item)
{
//finding items can only be done in "forward" direction
int retval = -1;
GeneratorNode originalNode = m_currentNode;
int originalIndex = m_index;
int originalSourceDataIndex = m_sourceDataIndex;
while (retval == -1)
{
ItemsGeneratorNode itemsNode = m_currentNode as ItemsGeneratorNode;
if (itemsNode != null)
{
int tmpIndex = itemsNode.Items.IndexOf(item);
if (tmpIndex > -1)
{
tmpIndex += itemsNode.CountDetailsBeforeDataIndex(tmpIndex);
//item is directly from this items node... then return the appropriate index!
retval = m_index + tmpIndex;
break;
}
else
{
//if the item is from a detail, then I don't want to "use" it!!!
retval = -1;
//but continue looping.... to find occurances of this item somewhere else in the tree
}
}
else
{
CollectionGeneratorNode collectionNode = m_currentNode as CollectionGeneratorNode;
if (collectionNode != null)
{
int tmpIndex = collectionNode.IndexOf(item);
if (tmpIndex != -1)
{
retval = m_index + tmpIndex;
break;
}
}
}
//if we reach this point, it's because the item we are looking
//for is not in this node... Try to access the child
if (this.MoveToChild())
{
continue;
}
//if we reach this point, it's because we have no child...
if (this.MoveToNext())
{
continue;
}
//final try, try "advancing" to the next item.
if (this.MoveToFollowing())
{
continue;
}
//up to this, we are in an endpoint, we failed.
break;
}
if (retval == -1)
{
m_currentNode = originalNode;
m_index = originalIndex;
m_sourceDataIndex = originalSourceDataIndex;
}
return(retval);
}
