barcode generator source code in c#.net An overview of the PDF manipulation classes Usage in Java

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Table 6.1 An overview of the PDF manipulation classes Usage
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iText class
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PdfReader PdfImportedPage
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Reads PDF files. You pass an instance of this class to one of the other PDF manipulation classes. A read-only subclass of PdfTemplate. Can be obtained from a PDF manipulation class using the method getImportedPage(). Generates PDF documents from scratch. Can import pages from other PDF documents. The major downside is that all interactive features of the imported page (annotations, bookmarks, fields, and so forth) are lost in the process. Manipulates one (and only one) PDF document. Can be used to add content at absolute positions, to add extra pages, or to fill out fields. All interactive features are preserved, except when you explicitly remove them (for instance, by flattening a form). Copies pages from one or more existing PDF documents. Major downsides: PdfCopy doesn t detect redundant content, and it fails when concatenating forms. Copies pages from one or more existing PDF documents. PdfSmartCopy is able to detect redundant content, but it needs more memory and CPU than PdfCopy. Puts the fields of the different forms into one form. Can be used to avoid the problems encountered with form fields when concatenating forms using PdfCopy. Memory use can be an issue.
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PdfCopy
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In the next chapter, we ll focus mainly on PdfStamper. I ll introduce the concept of annotations, and you ll learn that form fields are a special type of annotation. You ll create a form from scratch using iText, and we ll discuss the different types of interactive forms in PDF.
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Making documents interactive
This chapter covers
Creating actions and destinations Working with outlines and bookmarks Adding annotations and JavaScript
In the summary of the previous chapter, table 6.1 outlined the most important iText classes for manipulating documents. You ve used these classes to manipulate the content of existing documents to copy pages, add extra content, fill out forms, and so forth. In this chapter, you ll use PdfStamper and PdfCopy to add interactive features to an existing document. We ll start by adding actions that will help the end user navigate through the document, similar to what you did with internal and external links in section 2.3.1. Next we ll look at bookmarks, but instead of using s and Sections, as you did in section 2.3.2, we ll look at how to create a custom outline tree. Finally, we ll add annotations. For example, you ll learn how to put a sticky note on an existing page, and how to show an advertisement when a PDF document is opened.
Introducing actions
Introducing actions
If you re reading this book from beginning to end, actions shouldn t be new to you. You created documents containing actions in chapter 2, but we didn t call them actions; instead we talked about remote and local goto links. In this section, you ll add goto actions using the PdfAction class, and you ll also learn how to introduce new actions, such as actions that trigger JavaScript functions embedded in the document. But let s start with an example that adds actions to navigate through documents.
Document-navigation actions
Most PDF viewers have buttons that allow the end user of the PDF document to switch to another page. In some cases, these viewer buttons can be removed or the toolbar can be hidden by setting the viewer preferences. Maybe you want to add extra navigational aids to the page itself, to make it easier for the end user to go to the first, previous, next, or last page. For this purpose, ISO-32000-1 defines four named actions that should be supported by every PDF viewer.
NAMED ACTIONS
In figure 7.1, you can find arrows to jump to the first page ( ), the previous page ( ), the next page ( ), and the last page ( ).
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