/// <summary>Reads the /Order in the /D entry and initialized the parent-child hierarchy.</summary>
private void ReadOrderFromDictionary(PdfLayer parent, PdfArray orderArray, IDictionary <PdfIndirectReference
, PdfLayer> layerMap)
{
for (int i = 0; i < orderArray.Size(); i++)
{
PdfObject item = orderArray.Get(i);
if (item.GetObjectType() == PdfObject.DICTIONARY)
{
PdfLayer layer = layerMap.Get(item.GetIndirectReference());
if (layer != null)
{
layers.Add(layer);
layer.onPanel = true;
if (parent != null)
{
parent.AddChild(layer);
}
if (i + 1 < orderArray.Size() && orderArray.Get(i + 1).GetObjectType() == PdfObject.ARRAY)
{
PdfArray nextArray = orderArray.GetAsArray(i + 1);
if (nextArray.Size() > 0 && nextArray.Get(0).GetObjectType() != PdfObject.STRING)
{
ReadOrderFromDictionary(layer, orderArray.GetAsArray(i + 1), layerMap);
i++;
}
}
}
}
else
{
if (item.GetObjectType() == PdfObject.ARRAY)
{
PdfArray subArray = (PdfArray)item;
if (subArray.IsEmpty())
{
continue;
}
PdfObject firstObj = subArray.Get(0);
if (firstObj.GetObjectType() == PdfObject.STRING)
{
PdfLayer titleLayer = PdfLayer.CreateTitleSilent(((PdfString)firstObj).ToUnicodeString(), GetDocument());
titleLayer.onPanel = true;
layers.Add(titleLayer);
if (parent != null)
{
parent.AddChild(titleLayer);
}
ReadOrderFromDictionary(titleLayer, new PdfArray(subArray.SubList(1, subArray.Size())), layerMap);
}
else
{
ReadOrderFromDictionary(parent, subArray, layerMap);
}
}
}
}
}