/// <summary>
/// Returns the previous iterator to a leaf in the document object tree pointing.
/// </summary>
/// <returns>The previous leaf, null if none exists.</returns>
internal ParagraphIterator GetPreviousLeaf()
{
//Move up to appropriate parent element
ParagraphIterator parIterator = GetParentIterator();
if (parIterator == null)
{
return(null);
}
int elementIndex = LastIndex;
ParagraphElements parEls = (ParagraphElements)parIterator._current;
while (elementIndex == 0)
{
elementIndex = parIterator.LastIndex;
parIterator = parIterator.GetParentIterator();
if (parIterator == null)
{
break;
}
parEls = (ParagraphElements)parIterator._current;
}
if (parIterator == null)
{
return(null);
}
int newIndex = elementIndex - 1;
if (newIndex < 0)
{
return(null);
}
List <int> indices = new List <int>(parIterator._positionIndices);//(Array_List)parIterator.positionIndices.Clone();
indices.Add(newIndex);
DocumentObject obj = GetNodeObject(parEls[newIndex]);
ParagraphIterator iterator = new ParagraphIterator(_rootNode, obj, indices);
return(iterator.SeekLastLeaf());
}
/// <summary>
/// Returns the next iterator in the tree pointing to a leaf.
/// </summary>
/// <remarks>This function is intended to receive the renderable objects of a paragraph.
/// Thus, empty ParagraphElement objects (which are collections) don't count as leafs.</remarks>
internal ParagraphIterator GetNextLeaf()
{
//Move up to appropriate parent element
ParagraphIterator parIterator = GetParentIterator();
if (parIterator == null)
{
return(null);
}
int elementIndex = this.LastIndex;
ParagraphElements parEls = (ParagraphElements)parIterator.current;
while (elementIndex == parEls.Count - 1)
{
elementIndex = parIterator.LastIndex;
parIterator = parIterator.GetParentIterator();
if (parIterator == null)
{
break;
}
parEls = (ParagraphElements)parIterator.current;
}
if (parIterator == null)
{
return(null);
}
int newIndex = elementIndex + 1;
if (newIndex >= parEls.Count)
{
return(null);
}
ArrayList indices = (ArrayList)parIterator.positionIndices.Clone();
indices.Add(newIndex);
DocumentObject obj = GetNodeObject(parEls[newIndex]);
ParagraphIterator iterator = new ParagraphIterator(this.rootNode, obj, indices);
return(iterator.SeekFirstLeaf());
}