/// <summary>
/// Create tree item or several tree items in parent-child relation based on levels count.
/// There might be situations where document is invalid and header2 is followed by header4
/// then to keep tree structure we need to create fake header3 in the middle.
/// </summary>
/// <param name="currentHeader">current header</param>
/// <param name="levels">int representation of how many levels there is
/// between curent header and last one added</param>
/// <param name="headingBlock">data source for tree item</param>
/// <param name="lastItemAdded">item added previously to tree</param>
/// <returns>tree structure item for heading block</returns>
private HeaderData CreateTreeItem(HeaderData currentHeader, int levels, HeadingBlock headingBlock, out HeaderData lastItemAdded)
{
var result = new List <HeaderData>();
for (var i = 0; i < levels; i++)
{
result.Add(new HeaderData {
Level = currentHeader.Level + 1 + i
});
if (i == levels - 1)
{
result[i].Text = headingBlock.Inline.FirstChild.ToString();
result[i].Level = headingBlock.Level;
result[i].Id = headingBlock.GetAttributes().Id;
}
if (i > 0)
{
result[i - 1].Children = new List <HeaderData> {
result[i]
};
result[i].Parent = result[i - 1];
}
else
{
result[i].Parent = currentHeader;
}
}
lastItemAdded = result.Last();
return(result[0]);
}
