How to check for an event and remove it?

Is there a way to check to see if a page event has already been added to a PdfWriter object? If so, can you also remove that page event?

Posted on StackOverflow on Apr 15, 2014 by IyaTaisho

There is an IEventHandler interface in iText 7. You should add it’s implementation (say, MyEventHandler) to the PdfDocument instance like this:

PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
MyEventHandler handler = new MyEventHandler();
pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, handler);

You can check if the document has any type of event (PdfDocumentEvent.START_PAGE, PdfDocumentEvent.INSERT_PAGE, PdfDocumentEvent.REMOVE_PAGE, PdfDocumentEvent.END_PAGE) using hasEventHandler(String type) method.

To remove an existing page event, you need removeEventHandler(String type, IEventHandler handler) method. If you want to delete all page events, feel free to invoke removeAllHandlers().

Click How to check for an event and remove it? if you want to see how to answer this question in iText 5.