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Every time you fill out a form, you need to create new PdfStamper and AcroFields instances. Inside the AcroFields object, iText will create a TextField object for every text and choice field that s encountered. This is an expensive operation: the original form is read and every property is copied into the new TextField object. You can get a significant speed advantage if you create an empty HashMap B and use it as a cache for these objects with the setFieldCache() method C. The first time iText has to fill a form, an entry will be added to the cache for every text or choice field that s filled. This entry will be a key-value pair consisting of the field name and a TextField object. The next time the form is filled out, iText will fetch that TextField object, which will then be used to create a new appearance based on the new value that was filled in with setField(). In some cases, it may be necessary to adjust the appearance of a text field.

Appearances created by iText are an approximation of the way Adobe Reader renders the content of a text field. Depending on the tool used to create the form and the viewer used to open the form, the appearance created by iText won t always correspond to the appearance of the field when you click on it. This can be a serious problem when you want to flatten a form; there could be a consistent discrepancy of the baseline and the X-offset for all of the text fields. You can work around this problem by using the setExtraMargin() method D, which corrects the offset in X and Y directions by specifying extra margins to be applied to every text field in the form. There s more going on in listing 8.15: you re also removing and renaming fields. Moreover the form is flattened, but only partially.

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if (sessionId == null){ sessionId = connection.getHeaderField("set-cookie"); }

Partial form flattening In section 6.3.5, you created a template using Open Office. The fields were used as placeholders; once they were filled in, you were no longer interested in the form. You didn t have the intention to change the data. With the setFormFlattening() method, you threw away the internal form structure. Only the content of the fields was kept; it was added at the absolute positions defined in the template. You won t want this to happen if you re going to use iText to prefill a form, but you may want to make part of the form read-only.

The parameter name and value formats for cookies and session Ids will vary across application servers. This example illustrates the conventions for the BEA WebLogic servlet engine.

Suppose that the form shown in figure 8.6 is one of your standard forms. The first time an end user is confronted with it, he or she has to enter a name, login name, password, and motivation to get an accreditation for the festival. The form is then submitted to the server. The username and password are checked, and if the credentials are correct, you want to allow the end user to change the motivation entry, but not the name and login name. You also don t need the user s password anymore. You want the form to look like figure 8.7. The form resembles the form shown in figure 8.6, with a few exceptions:

When submitting data to the server, the session ID needs to be set on the HTTP request we are making. The following code illustrates how this is done:

The password field is removed. Internally, one of the field names has been changed. The values of the name and loginname fields are still visible, but the end user can no longer change them.

When you re working on a long document, it is often valuable to track changes you make. This is particularly true if you are working with others on the same document. Word s Track Changes feature allows you to not only see what changes you and others have made to the document, but also to accept or reject all or some of them. This is a powerful tool when it comes time to finalize the document. Before you can take advantage of these options, you must first turn on the Track Changes feature by clicking Tools Track Changes. You can also double-click TRK on the status bar, use the Ctrl+Shift+E keyboard shortcut, or click the Track Changes button on the Reviewing toolbar (the Reviewing toolbar appears when Track Changes is enabled).

The image used in figure 10.11 is the same JPEG used in figure 10.9. The JPEG format doesn t support transparency, but you can apply either an explicit mask or a soft mask.

connection.setRequestProperty("Cookie", sessionId);

byte circledata[] = { (byte) 0x3c, (byte) 0x7e, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0x7e, (byte) 0x3c }; Image mask = Image.getInstance(8, 8, 1, 1, circledata); mask.makeMask(); mask.setInverted(true);

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