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In all the other pages except the shopping cart page, the visitor will be able to see a shopping cart summary in the left part of the screen as shown in Figure 8-3. At the end of this chapter, you ll have a functional shopping cart, but the visitor will not yet be able to order the products contained in it. You ll add this functionality in the next chapter, when you implement a custom checkout the Proceed to Checkout button. When the visitor clicks this button, the products in the shopping cart are saved as a separate order in the database, and the visitor is redirected to a page to pay. If you integrated the PayPal shopping cart for the first development stage, starting with the next chapter, PayPal will only be used to handle payments, and you won t rely on its shopping cart anymore. Specifically, in this chapter, you ll learn how to Design a shopping cart Add a new database table to store shopping cart records Create the data tier functions that work with the new table Implement the business layer methods Implement the Add to Cart and View Cart buttons (or make them work with the new shopping cart if you already implemented them in the PayPal chapter) Implement the presentation layer part of the custom shopping cart

You can see the result in figure 6.1 (the figure in the back). Observe that cell and image rotations go counterclockwise. In the next example, we ll look at how to apply more transformations.

You can transform pages in iText, just like you can transform images. Do you remember figure 3.2 That was the image I used to explain the different content layers used by iText. I created this image by generating a document with four pages, and then importing those pages into a new one; see figure 6.2. The imported pages are added to the new PDF document using addTemplate(). The parameters are calculated so that each page is scaled and skewed.

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Before starting to write the code for the shopping cart, let s take a closer look at what you re going to do. First, note that you won t have any user personalization features at this stage of the site. It doesn t matter who buys your products at this point, you just want to know what products were sold and when. When you add user customization features in the later chapters, your task will be fairly simple: when the visitor authenticates, the visitor s temporary (anonymous) shopping cart will be associated with the visitor s account. Because you work with temporary shopping carts, even after implementing the customer account system, the visitor isn t required to supply additional information (log in) earlier than necessary. Probably the best way to store shopping cart information is to generate a unique cart ID for each shopping cart and save it on the visitor s computer as a cookie. When the visitor clicks the Add to Cart button, the server first verifies whether the cookie exists on the client computer. If it does, the specified product is added to the existing cart. Otherwise, the server generates another cart ID, saves it to the client s cookie, and then adds the product to the newly generated shopping cart. In the previous chapter, you created the componentized templates by starting with the presentation layer components. However, this strategy doesn t work here because now you need to do a bit more design work beforehand, so we ll take the more common approach and start with the database tier.

6. You can drag the resize handle at the bottom right of the last row in the table to make the table larger or smaller (see Figure 1-15).

PdfContentByte canvas = writer.getDirectContent(); PdfImportedPage page; BaseFont bf = BaseFont.createFont(BaseFont.ZAPFDINGBATS, "", BaseFont.EMBEDDED); for (int i = 0; i < reader.getNumberOfPages(); ) { page = writer.getImportedPage(reader, ++i); canvas.addTemplate(page, 1f, 0, 0.4f, 0.4f, 72, 50 * i); canvas.beginText(); canvas.setFontAndSize(bf, 20); canvas.showTextAligned(Element.ALIGN_CENTER, String.valueOf((char)(181 + i)), 496, 150 + 50 * i, 0); canvas.endText(); }

Superimposing means that you add different PDF pages on top of each other on the same page. You could do this with the four pages shown to the left in figure 6.2 to obtain the PDF shown in figure 6.3.

You will store all the information from the shopping carts in a single table named shopping_cart. Follow the next exercise to create the shopping_cart table.

PdfReader reader = new PdfReader(SOURCE); Document document = new Document(PageSize.POSTCARD); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT)); document.open(); PdfContentByte canvas = writer.getDirectContent(); PdfImportedPage page;

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