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Link annotations
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This isn t the first time you ve worked with annotations. Whenever you created links for instance, using the Anchor class (see section 2.3.1) or using the Chunk method setAction() (see section 7.1.1) you were creating a link annotation. In the next couple of examples, you ll create a clickable image and add clickable rectangles to the timetable.
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If you compare figure 7.10 with figure 3.17, there s one major difference: when you move your mouse over a movie poster on the PDF that s shown in figure 7.10, a tooltip appears, revealing the URL of the corresponding movie on IMDB. If you click the movie poster, Adobe Reader will ask you if you want to open that page in a browser window.
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Figure 7.15 Link annotations have been added to all the images; see, for instance, the link to Donnie Darko at IMDB
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Listing 7.22 MoviePosters1
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Image img; Annotation annotation; float x = 11.5f; float y = 769.7f; for (Movie movie : PojoFactory.getMovies(connection)) { img = Image.getInstance(String.format(RESOURCE, movie.getImdb())); img.scaleToFit(1000, 60); img.setAbsolutePosition(x + (45 - img.getScaledWidth()) / 2, y); annotation = new Annotation(0, 0, 0, 0, String.format(IMDB, movie.getImdb())); Creates link img.setAnnotation(annotation); annotation Makes image canvas.addImage(img); clickable x += 48; if (x > 578) { x = 11.5f; y -= 84.2f; } }
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You use the simple Annotation class to create the link annotation. The first four parameters are meant to pass the coordinates for the clickable area, but listing 7.22 shows how you can make the image clickable using the method Image.setAnnotation(), so you don t have to worry about coordinates. iText will set these parameters so they correspond with the image location.
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You can adapt listing 7.21 so that instead of adding text annotations with extra info about each movie, it adds a link annotation that corresponds with each screening.
Making documents interactive
Listing 7.23 TimetableAnnotations2
int page = 1; Rectangle rect; PdfAnnotation annotation; for (Date day : PojoFactory.getDays(connection)) { for (Screening screening : PojoFactory.getScreenings(connection, day)) { rect = getPosition(screening); annotation = PdfAnnotation.createLink( stamper.getWriter(), rect, PdfAnnotation.HIGHLIGHT_INVERT, new PdfAction(String.format(IMDB, screening.getMovie().getImdb())) ); stamper.addAnnotation(annotation, page); } page++; }
Creates link annotation Adds annotation to existing page
Just as with createText(), you need to pass a PdfWriter and a Rectangle object to the createLink() method. The third parameter should be one of the following values:
HIGHLIGHT_NONE No highlighting (the default). The links created with Anchor, Chunk.setAnchor(), or Chunk.setAction() aren t highlighted when
you click them.
HIGHLIGHT_INVERT Inverts the content of the annotation square when
clicked. That s what is used in listing 7.23. If you click a movie block, the colors will be inverted. HIGHLIGHT_OUTLINE Inverts the annotation border when clicked. HIGHLIGHT_PUSH Displays the annotation as if it were being pushed below the surface of the page.
The destination of the link annotation can be a PdfAction, as in listing 7.23, a String for a named destination, or a PdfDestination for an explicit destination. Now let s continue our overview of iText s most popular annotations with file attachments.
File attachments
The document shown in figure 7.11 is almost identical to the documents shown in figure 7.7, but the annotation is visualized as a paperclip. This paperclip indicates that an annotation with subtype /FileAttachment was added. If you click the paperclip icon in the left sidebar of Adobe Reader, you can get an overview of all the files that are attached to the PDF. As you can see, the attachments are a series of JPEG images with names in the form img_xyz.jpg, where xyz is the primary key of a movie at IMDB. If you click a paperclip next to one of the movie titles, the poster of that movie will be opened using the default image viewer on your computer. Note that, depending on your security preferences, the PDF viewer may ask you if you re sure before opening another application. How was this PDF document created
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