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Listing 7.5 TimetableDestinations.java
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public void manipulatePdf(String src, String dest) throws IOException, DocumentException { PdfReader reader = new PdfReader(src); int n = reader.getNumberOfPages(); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); actions = new ArrayList<PdfAction>(); PdfDestination d; Creates for (int i = 0; i < n; ) { destination d = new PdfDestination(PdfDestination.FIT); actions.add(PdfAction.gotoLocalPage( Creates action and ++i, d, stamper.getWriter())); adds it to list } PdfContentByte canvas; for (int i = 0; i < n; ) { canvas = stamper.getOverContent(++i); createNavigationTable(i, n) Creates table containing .writeSelectedRows(0, -1, 696, 36, canvas); the actions
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} stamper.close(); }
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This is a rewrite of the first example in this chapter. The output is identical to what is shown in figure 7.1. Instead of using named actions, you create a List containing PdfAction objects. If you look at the parameters of the gotoLocalPage() method, you ll recognize the page number, the destination of choice, and a third parameter that needs further explanation.
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PAGE NUMBERS VERSUS PAGE REFERENCES
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In listing 7.3, you retrieved information about named destinations using the SimpleNamedDestination class. This class uses reader.getNamedDestination() to get the named destinations. You could use this method too, but you d get entries like this:
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US=[1 0 R, /XYZ, 36, 802, 0] AR=[210 0 R, /XYZ, 36, 802, 0]
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The values 1 0 R and 210 0 R aren t page numbers but references to page dictionaries. There are no page numbers inside a PDF file. Pages are organized in a page tree, and their position in this tree defines the page number. When you create a link to an explicit destination using gotoLocalPage(), iText needs to translate the page number (for instance, page 19 to jump to the page with films from Argentina) to a reference (such as 210 0 R). iText can only do this if you also pass a PdfWriter instance. In listing 7.5, you pass the writer associated with a PdfStamper object: stamper.getWriter(). You ll create more destinations in section 7.2, when we talk about bookmarks, but first, let s introduce JavaScript into your documents.
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JavaScript is a scripting language that is primarily used to add client-side functionality to an HTML page and to create dynamic websites. It allows programmatic access to objects within the web browser. JavaScript is also available in PDF viewers such as Adobe Reader. There s a JavaScript API for PDF documents that extends the core client-side JavaScript specification and gives you access to Acrobat and Adobe Reader objects. Initially JavaScript 1.2 was used; since Acrobat 5.0, the API has been based on JavaScript 1.5. The most recent versions of Acrobat and Adobe Reader (since 8.0) use JavaScript 1.6. If you want to know more about the complete set of objects and functions, you can download the PDFs Developing Acrobat Applications Using JavaScript and JavaScript for Acrobat API Reference from the adobe.com site (see appendix B for useful links). We re going to use some of the objects listed in those references to learn how to introduce JavaScript in a PDF document using iText.
DOCUMENT-LEVEL JAVASCRIPT
Here is an example of a simple script that clears the JavaScript console window, makes it visible, and writes information about the viewer and its version number.
Introducing actions Listing 7.6 viewer_version.js
console.clear(); console.show(); console.println("Hello"); console.println("You are using: " + app.viewerType); console.println("The version of " + app.viewerType + " is: " + app.viewerVersion);
The console is an object that originally wasn t available in Adobe Reader, only in Acrobat. It was introduced in Adobe Reader 7.0 to report errors and show messages. The script in listing 7.6 prints the value of the viewerType and viewerVersion property of the application (the app object) to the console, as shown in figure 7.2. Figure 7.2 shows that I opened the document in Adobe Reader version 9.2. You can add the script from listing 7.6 to an existing PDF document.
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