java barcode reader CHANGING THE PROPERTIES OF WIDGET ANNOTATIONS IN EXISTING FORMS in Java

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CHANGING THE PROPERTIES OF WIDGET ANNOTATIONS IN EXISTING FORMS
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There s also a setFieldProperty() method to change the other properties of a field. Pass the field name as the first parameter. Table 8.3 explains the meanings of the second and third parameters. The fourth parameter has the same meaning as for the setFieldProperty() method that was used to change flags.
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FAQ I ve changed the properties of a field, yet I don t see any changes. Why not iText only creates new appearances for fields when the field value has changed. For example, you change the font size of the field "text_4" in listing 8.8, but you don t change its value. If you want to see the font size change, you also have to use the regenerateField() method.
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Filling in data with text fields
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Table 8.3 Changing the properties of a field Value Description Changes the font used in the field. Changes the text color. Changes the font size. Changes the background color. Changes the border color.
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Property
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"textfont" "textcolor" "textsize" "bgcolor" "bordercolor"
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BaseFont BaseColor Float BaseColor BaseColor
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Up until now, we ve avoided one property in the examples: you haven t used setFont() yet, nor have you changed the "textfont" property.
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Text fields and fonts
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Figure 8.3 shows three different PDF files with a text field. The text added for the three text fields is identical.
Creating text fields containing Unicode characters
As you can see, the Chinese names are missing in the upper example; they re present in the second and third PDFs, but different fonts are used. The code used to create the three different PDFs doesn t differ much.
Listing 8.9 TextFieldFonts.java
public void createPdf( String filename, boolean appearances, boolean font) throws IOException, DocumentException { Document document = new Document(); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename));
Filling out interactive forms
document.open(); writer.getAcroForm().setNeedAppearances(appearances); TextField text = new TextField(writer, new Rectangle(36, 806, 559, 780), "description"); text.setOptions(TextField.MULTILINE); if (font) { BaseFont unicode = BaseFont.createFont( "c:/windows/fonts/arialuni.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); text.setExtensionFont(BaseFont.createFont()); ArrayList<BaseFont> list = new ArrayList<BaseFont>(); list.add(unicode); text.setSubstitutionFonts(list); } text.setText(TEXT); writer.addAnnotation(text.getTextField()); document.close(); }
Sets NeedAppearances flag if true
Defines fonts for text field
So far you ve been creating forms without B and C. This worked because you were only using Western characters. The Chinese characters in the TEXT aren t shown in the appearance of the text field because iText doesn t know where to find a font file containing those characters. You can work around this by setting the NeedAppearances flag B. When set, this flag instructs the PDF viewer to create the appearances for the widget annotations. This way you pass the responsibility for rendering the text correctly to the application that s used to view the PDF. The same mechanism is triggered when the end user clicks the text field to change the text. This won t work on all systems: the PDF viewer needs to have access to a font with the Chinese glyphs. C offers another workaround. With the setExtensionFont() method, you define the main font that should be used for the field. In this case, the default font Helvetica. Helvetica doesn t know how to draw Chinese characters, so you use the setSubstitutionFonts() method to add Arial Unicode. Whenever iText detects a character that can t be rendered with the extension font, it will go through the list of substitution fonts. The first font that has a glyph definition for the needed character will be used (see the third window in figure 8.3). In this case, iText will embed a subset of Arial Unicode in the PDF file.
ADDING UNICODE TO TEXT FIELDS
As soon as you try to fill out the form with other Asian characters than the ones that were in the TEXT string, you ll run into trouble. That s shown in the first and third windows of figure 8.4, which replace the English-Chinese text with a text containing some Korean characters. The upper three windows correspond to the three windows from figure 8.3. As you can see, the workaround B still works (for me, on my OS), but C fails because iText doesn t know where to find a font containing the Korean glyphs. Again there are two ways to work around this.
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