/// <summary>
/// Check whether a resource name is already used in the context of this resource dictionary.
/// PDF4NET uses GUIDs as resource names, but I think this weapon is to heavy.
/// </summary>
internal bool ExistsResourceNames(string name)
{
// TODO: more precise: is this page imported and is PageOptions != Replace
// BUG:
//if (!Owner.IsImported)
// return false;
// Collect all resouce names of all imported resources.
if (_importedResourceNames == null)
{
_importedResourceNames = new Dictionary <string, object>();
if (Elements[Keys.Font] != null)
{
Fonts.CollectResourceNames(_importedResourceNames);
}
if (Elements[Keys.XObject] != null)
{
XObjects.CollectResourceNames(_importedResourceNames);
}
if (Elements[Keys.ExtGState] != null)
{
ExtGStates.CollectResourceNames(_importedResourceNames);
}
if (Elements[Keys.ColorSpace] != null)
{
ColorSpaces.CollectResourceNames(_importedResourceNames);
}
if (Elements[Keys.Pattern] != null)
{
Patterns.CollectResourceNames(_importedResourceNames);
}
if (Elements[Keys.Shading] != null)
{
Shadings.CollectResourceNames(_importedResourceNames);
}
if (Elements[Keys.Properties] != null)
{
Properties.CollectResourceNames(_importedResourceNames);
}
}
return(_importedResourceNames.ContainsKey(name));
// This is superfluous because PDFsharp resource names cannot be double.
// importedResourceNames.Add(name, null);
}