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LINEAR PAGE MODE
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By default, iText creates a balanced tree, because using such a tree optimizes the performance of viewer applications. The simplest page tree structure consists of a single node that references all of the document s page objects directly. Reordering pages with iText is only possible if you tell PdfWriter to create this simple structure. To do so, you need to add the following line before opening the document:
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writer.setLinearPageMode();
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After opening the document, you add all the content. In this case, the content consists of a series of chapters.
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REORDERING PAGES
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Once the content is added, you can reorder the pages.
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Listing 5.13 MovieHistory1.java (continued)
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document.newPage(); Gets page number int toc = writer.getPageNumber(); where TOC starts for (Paragraph p : event.titles) { document.add(p); Writes TOC } document.newPage(); Gets total number int total = writer.reorderPages(null); of pages int[] order = new int[total]; for (int i = 0; i < total; i++) { order[i] = i + toc; Creates new if (order[i] > total) page order order[i] -= total; } writer.reorderPages(order); Reorders pages document.close();
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Let s examine this code step by step.
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B C D E
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You start on a new page, and you store the current page number. That s where the table of contents starts before reordering the pages. In this example, the TOC starts on page 27. You add the TOC. That s the list of Paragraphs you ve created in the page event. You need to start a new page before you can count the number of pages that need to be reordered. You obtain this value by calling the reorderPages() method a first time with null as the parameter. In this example, the total number of pages is 30. You create an array of int values that will be used to map the new page index to the old page number. The new page with index 0 the new page 1 will be the old page with number toc. In this example, the first page will be the old page 27. The TOC consists
Table, cell, and page events
of 4 pages. The new page with index 4 that is, page 5 was originally page 1. Creating the new order is a matter of doing some simple math.
Once this mapping is done, you invoke reorderPages() a second time with the new order as the parameter. You could replace the two lines marked with D with the following line:
int total = writer.getPageNumber();
But experience has taught me that this can cause exceptions if the current page is empty. You may wonder if using document.newPage() won t result in an unnecessary extra blank page at the end of the document. The answer is no: iText ignores document.newPage() if the current page is empty. iText never adds a blank page to a document unintentionally.
ADDING A BLANK PAGE
If adding a blank page is a requirement, you have to tell iText explicitly about this.
Listing 5.14 NewPage.java
document.add(new Paragraph( "This page will NOT be followed by a blank page!")); document.newPage(); document.newPage(); document.add(new Paragraph( "This page will be followed by a blank page!")); document.newPage(); writer.setPageEmpty(false); document.newPage(); document.add( new Paragraph("The previous page was a blank page!"));
In B, you add a Paragraph to page 1. With document.newPage() C, you go to page 2, but you don t add anything to this page: you immediately ask for another new page. Since nothing was added to page 2, D will be ignored: the second Paragraph E will be added on page 2. Page 2 is no longer empty, so F will take you to page 3. You don t add any content to page 3, but with G you tell iText that the current page should not be treated as an empty page. H takes you to page 4, and that s where the third Paragraph I will be added. The example about creating a TOC using and Section events led us somewhat astray and resulted in a discussion about pages. We ll talk about the second category of page events in section 5.4, but first we ll take a closer look at the boundaries of a page.
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