barcode generator source code in c#.net and Section: get bookmarks for free in Java

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If you scroll in the bookmarks panel shown in figure 2.12, you ll see entries numbered from 1 to 7: Forties, Fifties, Sixties, Seventies, Eighties, Nineties, and Twenty-first century. You can create these entries by organizing the content in chapters. Every in this PDF document contains one or more Section objects. In this case, years that belong to the forties, fifties, and so on. In figure 2.12, there are also subsections with titles of movies. Let s compare listing 2.24 and figure 2.12. The chapter number is passed as a parameter when constructing the object. By default, a dot is added to the number, but you can change this with the setNumberStyle() method. Sections are created using the addSection() method. The title passed as a parameter when constructing a or Section is shown on the page and is used as the title for the bookmark. If you want to use a different title in the outline tree, you can use setBookmarkTitle(). You can change the indentation of a or Section by using different methods: setIndentation() changes the indentation of the content but doesn t affect the title; setIndentationLeft() and setIndentationRight() apply to the content and the title. Observe that the subsections aren t numbered 5.4.1., 5.4.2, 5.4.3 ... but 1., 2., 3. ... because the number depth has been reduced to 1 with setNumberDepth().
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Using iText s basic building blocks
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Figure 2.12 A PDF with bookmarks
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Listing 2.24 MovieHistory.java
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title = new Paragraph(EPOCH[epoch], FONT[0]); Creates chapter = new (title, epoch + 1); object ... title = new Paragraph(String.format( Creates "The year %d", movie.getYear()), FONT[1]); Section object section = chapter.addSection(title); section.setBookmarkTitle(String.valueOf(movie.getYear())); section.setIndentation(30); section.setBookmarkOpen(false); section.setNumberStyle( Section.NUMBERSTYLE_DOTTED_WITHOUT_FINAL_DOT); section.add(...); ... title = new Paragraph(movie.getMovieTitle(), FONT[2]); Creates subsection = section.addSection(title); Section object subsection.setIndentationLeft(20 subsection.setNumberDepth(1); subsection.add(...);
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As shown in the class diagram in figure 2.1, Section also implements an interface named LargeElement. In chapter 1, you learned that iText tries to write PDF syntax to the OutputStream, freeing memory as soon as possible. But with objects such as , you re creating content in memory that can only be rendered to PDF when you add them to the Document object. This means that the content of several pages can be kept in memory until iText gets the chance to generate the PDF syntax. There are two ways to work around this:
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Adding Anchor, Image, , and Section objects
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Define the as incomplete, and add it to the Document in different pieces; you ll see how to do this in chapter 4, after we discuss another LargeElement, PdfPTable. Create the outline tree using PdfOutline instead of putting content in or Section objects. This will be discussed in chapter 7, where you ll discover that PdfOutline offers much more flexibility.
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We ve covered almost all the objects in the class diagram. Only two objects remain: Rectangle and Image.
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The Image object: adding raster format illustrations
You created Rectangle objects in chapter 1 to define the page size, but there s very little chance you ll ever need to add a Rectangle object with Document.add(). We ll find better ways to draw shapes in chapter 3, but let s take a look at a simple example for the sake of completeness.
Listing 2.25 MoviePosters1.java
Rectangle rect = new Rectangle(0, 806, 36, 842); rect.setBackgroundColor(BaseColor.RED); document.add(rect);
The code draws a small red square in the upper-left corner of the first page.
ADDING AN IMAGE
To add an Image to a PDF document, do this:
Listing 2.26 MoviePosters1.java (continued)
document.add(new Paragraph(movie.getMovieTitle())); document.add( Image.getInstance(String.format(RESOURCE, movie.getImdb())));
iText comes with different classes for different image types: Jpeg, PngImage, GifImage, TiffImage, and so on. All these classes are discussed in detail in chapter 10. They either extend the Image class, or they are able to create an instance of the Image class. You could use these separate classes to create a new Image, but it s easier to let the Image class inspect the binary image and decide which class should be used, based on the contents of the file. That s one thing less to worry about.
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