PdfTextElementOnBeforePageRender Property

Optional callback called before the text is drawn on each page, with the PdfTextPageRenderInfo of that page: the rectangle the text is about to use and the part of the text drawn on the page. The content drawn on the page from the callback, like a background or a decoration, appears under the text

public Action<PdfTextPageRenderInfo> OnBeforePageRender { get; set; }