You should really do some reading in the PDF Reference, but here's a quicky (simplified!) explanation.
There are three parts to Optional Content (aka layer) in a PDF - the actual definitions in each content stream, the document-level naming/ organization of the groups (OCG's) and the per-page "Properties" that link the two together. Since iText copies the streams intact when it copies pages, the first part is already moved over. The document- level objects are NOT copied (and/or merged), however - that would need to be implemented. The properties are PARTIALLY copied - the static elements go, but the "rebinding" can't happen due to the lack of document objects. So for you to implement this, you'd need to understand the global objects to be copied (that's pretty easy) and then as part of the page copying code - rebind the properties. That's the harder part. Leonard On Feb 14, 2008, at 6:08 AM, Paulo Soares wrote: > When there's no answer: > > 1 - We didn't understand the question. > 2 - We're too busy to answer. > 3 - We've already answered. > 4 - We don't have the time to explain a solution. > 5 - We don't have the time to implement a solution (sometimes it's > easier than to explain). > 6 - It's not currently our priority (it doesn't mean it's forgotten, > just not for now). > > In this case it's 4, 5 and 6. > > Paulo > >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On >> Behalf Of Stefan Burkard >> Sent: Thursday, February 14, 2008 10:58 AM >> To: itext-questions@lists.sourceforge.net >> Subject: [iText-questions] Repost: PDF merging with layers >> >> hi all >> >> sorry, but I repost this since there were no further answers... >> >> ------------------------------------------------ >> >> in my case this would be quite clear: I'd like to have all layers >> that >> appear in any source document copied to the target document (with the >> same visibility settings). >> >> if a layer name appears in multiple documents, the contents of all >> the >> same named layers should be merged together in the target >> document under >> the same layer name. the visibility should be "visible" if any of the >> merged layers with the same name is visible in its source document. >> >> so I know what to do, how can I do this? and what do you mean >> with "The >> layers themselves are already copied"? is this already >> implemented in itext? >> >> thanks a lot >> stefan >> >> >> Paulo Soares wrote: >>>> The problem is how to conciliate the various ways to >> control the layers >>>> and the layer's names that are present in different >> documents. The >>>> layers themselves are already copied. It's more a >> problem of what to do >>>> rather than how to do it. >>>> >>>> Paulo >>>> >>>>>> -----Original Message----- >>>>>> From: [EMAIL PROTECTED] >>>>>> [mailto:[EMAIL PROTECTED] On >>>>>> Behalf Of Stefan Burkard >>>>>> Sent: Friday, February 01, 2008 2:55 PM >>>>>> To: itext-questions@lists.sourceforge.net >>>>>> Subject: [iText-questions] plans for PDF merging with layers? >>>>>> >>>>>> Hi all >>>>>> >>>>>> I searched the list about the "missing feature" to merge PDF >> documents >>>>>> without loosing the layers of them. >>>>>> >>>>>> I found several threads about this and there were also >> statements >> that >>>>>> this feature is planned, but not scheduled. >>>>>> >>>>>> I even found a thread on this list with java-code to implement >> exactly >>>>>> this, but I don't know how much more work this code >> needs to get it >>>>>> running... >>>>>> >>>>>> Question: Are there any concrete plans to implement >> this in the >> next 3 >>>>>> months into iText? >>>>>> >>>>>> And can anybody give me a hint about how this would be done? >> Would one >>>>>> "just" need to read all layers, recreate them in the new >>>>>> document and is >>>>>> then able to copy the PDF content layer by layer? >>>>>> Or would one have to recreate the layers in the new >> document and then >>>>>> copy every single object to it's layer in the new document? >>>>>> >>>>>> Thanks >>>>>> Stefan > > > Aviso Legal: > Esta mensagem é destinada exclusivamente ao destinatário. 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