java qr code reader for mobile ParagraphPositions is an example of how to create events for Paragraph objects. in Java

Creation QR Code JIS X 0510 in Java ParagraphPositions is an example of how to create events for Paragraph objects.

ParagraphPositions is an example of how to create events for Paragraph objects.
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Table, cell, and page events
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Paragraph events
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The ParagraphPositions class creates Paragraph events.
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Listing 5.11 MovieYears.java (continued)
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class ParagraphPositions extends PdfPageEventHelper { public void onParagraph( PdfWriter writer, Document pdfDocument, float paragraphPosition) { drawLine(writer.getDirectContent(), pdfDocument.left(), pdfDocument.right(), paragraphPosition - 8); } public void onParagraphEnd( PdfWriter writer, Document pdfDocument, float paragraphPosition) { drawLine(writer.getDirectContent(), pdfDocument.left(), pdfDocument.right(), paragraphPosition - 5); } public void drawLine(PdfContentByte cb, float x1, float x2, float y) { cb.moveTo(x1, y); cb.lineTo(x2, y); cb.stroke(); } }
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Called before Paragraph is rendered
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Called after Paragraph is rendered
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There are two page event methods involving paragraphs. The first two parameters of these methods, writer and pdfDocument, have the same meaning as the onGenericTag() parameters with the same names. I repeat: use pdfDocument for read-only purposes. In this example, you use pdfDocument to get the values of the left and right margins of the page. An extra parameter named paragraphPosition gives you access to a Y coordinate. These are the two page event methods:
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onParagraph() Called before a Paragraph is rendered. The paragraphPosition passed to the method is the Y coordinate of the baseline of the first line of the Paragraph, augmented with its leading. onParagraphEnd() Called after a Paragraph is rendered. The paragraphPosition is the Y coordinate of the baseline of the last line of the Paragraph.
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There are also page events involving and Section.
and Section events
You can use and Section events for the same reasons you use Paragraph events: to retrieve a Y position and use that coordinate to draw lines or shapes. This is what s done in figure 5.7.
Events for basic building blocks
Page events for s and Sections
As you know, using and Section automatically creates an outline tree, visible in the bookmarks pane of Adobe Reader. In the next example, you ll use page events to create a table of contents that can be printed. See figure 5.8. Next, you ll reuse the example from section 2.3.2, but add a page event implementation for events that are triggered when a , a Section, or both, starts or ends.
Page events for s and Sections: reordering pages
Table, cell, and page events
Listing 5.12 MovieHistory1.java
class SectionTOC extends PdfPageEventHelper { List titles = new ArrayList<Paragraph>(); public void on( PdfWriter writer, Document document, float position, Paragraph title) { titles.add( new Paragraph(title.getContent(), FONT[4])); } public void onEnd( PdfWriter writer, Document document, position) { drawLine(writer.getDirectContent(), document.left(), document.right(), position - 5); } public void onSection( PdfWriter writer, Document document, float position, int depth, Paragraph title) { title = new Paragraph(title.getContent(), FONT[4]); title.setIndentationLeft(18 * depth); titles.add(title); } public void onSectionEnd( PdfWriter writer, Document document, float position) { drawLine(writer.getDirectContent(), document.left(), document.right(), position - 3); } public void drawLine(PdfContentByte cb, float x1, float x2, float y) { cb.moveTo(x1, y); cb.lineTo(x2, y); cb.stroke(); } }
Contains list of titles
Adds title to list
Draws line 5 pt under
Adds Section title to list
Draws line 3 pt under Section
The onEnd() and onSectionEnd() methods are very similar to onParagraphEnd(). The on() and onSection() methods are similar to onParagraph(), but they have extra parameters. The title parameter contains the title you ve defined for the or Section; depth tells you how deep the Section can be found in the outline tree. In this example, you re adding Paragraphs with the content of the and Section titles to a list, and you re using the depth of the Sections to define an indentation. You can create a table of contents if you add all the Paragraphs in this list to the Document. You ll find this table of contents (TOC) on the last pages of the document. The TOC entries are stored only after s and Sections are rendered. You can t add the TOC up front. If you want the document to start with the TOC on the first page, you ll need to find a way to reorder the pages before the Document is closed.
Events for basic building blocks
Page order and blank pages
Before we look at the code to reorder pages, you have to know that pages in a PDF document are usually organized in a page tree with different branches and leaves.
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