qr code generator java 1.4 Creating lists and combo boxes in Java

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Creating lists and combo boxes
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The fields shown in figure 8.5 were created using this code.
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Listing 8.12 ChoiceFields.java
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TextField text = new TextField(writer, rectangle, String.format("choice_%s", cf)); try { switch(cf) { case 1: text.setChoices(LANGUAGES); text.setChoiceExports(EXPORTVALUES); Creates text.setChoiceSelection(2); list box writer.addAnnotation(text.getListField()); break; case 2: text.setChoices(LANGUAGES); text.setBorderColor(BaseColor.GREEN); text.setBorderStyle(PdfBorderDictionary.STYLE_DASHED); text.setOptions(TextField.MULTISELECT);
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Creates multiple select list boxes
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Filling out interactive forms
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ArrayList<Integer> selections = new ArrayList<Integer>(); selections.add(0); Creates selections.add(2); multiple text.setChoiceSelections(selections); select list PdfFormField field = text.getListField(); boxes writer.addAnnotation(field); break; case 3: text.setBorderColor(BaseColor.RED); text.setBackgroundColor(BaseColor.GRAY); text.setChoices(LANGUAGES); Creates combo box text.setChoiceExports(EXPORTVALUES); text.setChoiceSelection(4); writer.addAnnotation(text.getComboField()); break; case 4: text.setChoices(LANGUAGES); Creates editable text.setOptions(TextField.EDIT); combo box writer.addAnnotation(text.getComboField()); break; }
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} catch(IOException ioe) { throw new ExceptionConverter(ioe); } catch(DocumentException de) { throw new ExceptionConverter(de); }
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Observe that you re using the TextField convenience class once again. This is an iText design decision, based on the fact that drawing the appearance of a list or combo box isn t all that different from drawing the appearance of a text box. Instead of using getTextField() to obtain a PdfFormField instance, you now have to use the methods getListField() or getComboField(). You can use the same methods to set properties as you used for the text field widgets. The values that are shown to the end user are set with the method setChoices(). In listing 8.12, the LANGUAGES array consists of five languages. In B and D, you use setExportValues(), passing the EXPORTVALUES array. That array looks like this:
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String[] EXPORTVALUES = { "EN", "DE", "FR", "ES", "NL" };
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Every export value has to correspond with an option in the choice array. When the form is submitted to a server, the export value will be used. For instance, if the end user selects "English" and submits the form, the corresponding export value "EN" will be submitted. Note that these export values aren t used when you preselect an option the setChoiceSelection() method expects an int. For multiple select lists, you can also use the setChoiceSelections() method with a list of integers. You don t define export values in C and E; in this case, the full language name will be sent to the server. In E, you set the EDIT flag, so the end user filling out the form can even add languages that aren t present in the LANGUAGES array. Now let s find out how to manipulate the values of the choices in an existing PDF document.
Refining the form-filling process
Manipulating lists and combo boxes
Let s take the PDF you created in section 8.4.1 and pretend that you forgot which options and export values are available in the choice fields of the form. How could you retrieve those values And how would you change the selection
Listing 8.13 ChoiceFields.java (continued)
PdfReader reader = new PdfReader(src); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); AcroFields form = stamper.getAcroFields(); form.setField("choice_1", "NL"); Selects one form.setListSelection("choice_2", Selects two options in option in new String[]{"German", "Spanish"}); multiple-select choice choice String[] languages = form.getListOptionDisplay("choice_3"); Gets options and String[] exportvalues export values = form.getListOptionExport("choice_3"); int n = languages.length; String[] new_languages = new String[n + 2]; String[] new_exportvalues = new String[n + 2]; for (int i = 0; i < n; i++) { new_languages[i] = languages[i]; new_exportvalues[i] = exportvalues[i]; } Adds two languages new_languages[n] = "Chinese"; to choice new_exportvalues[n] = "CN"; new_languages[n + 1] = "Japanese"; new_exportvalues[n + 1] = "JP"; form.setListOption("choice_3", new_exportvalues, new_languages); Selects option that form.setField("choice_3", "CN"); wasn t in the choice form.setField("choice_4", "Japanese"); stamper.close();
You already know the setField() method, but now you can also use the setListSelection() method to choose more than one value in a multiple-select list box. You can use the methods getListOptionDisplay() and getListOptionExport() to determine the available options. If you re not happy with the available options, you can use the setListOption() method to replace the sets of existing display and export values with new arrays. Or, if the field is an editable combo box, you can set a value that isn t present in the choice field. Now that you know all the types of fields that can be used in an interactive form, let s have a look at issues you may encounter when filling out form fields.
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