java qr code reader for mobile Wrapping tables in columns in Java

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Wrapping tables in columns
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Figure 4.16 shows a table with a header and footer that were added at absolute positions in two separate columns on the same page. In listing 4.23, you use the ColumnText mechanism from chapter 3 in combination with the PdfPTable functionality that repeats headers and footers (explained in section 4.3.1).
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A PdfPTable rendered in two columns
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Listing 4.23 ColumnTable.java
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ColumnText column = new ColumnText(writer.getDirectContent()); List days = PojoFactory.getDays(connection); float[][] x = { Defines { document.left(), document.left() + 380 }, column { document.right() - 380, document.right() } borders }; for (Date day : days) { column.addElement(getTable(connection, day)); Adds table with int count = 0; screenings float height = 0; int status = ColumnText.START_COLUMN; while (ColumnText.hasMoreText(status)) { if (count == 0) { height = addHeaderTable(document, Adds extra day, writer.getPageNumber()); header table } column.setSimpleColumn( x[count][0], document.bottom(), x[count][1], document.top() - height - 10); status = column.go(); if (++count > 1) { count = 0; document.newPage();
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} } document.newPage(); }
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This section introduced some low-level functionality of the high-level table object. In the next chapter, we ll return to the PdfPTable and PdfPCell objects, and you ll use low-level methods to draw tables and cells with rounded corners and other fancy layout features. But first, let s look back on what you ve learned in this chapter.
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This chapter was dedicated entirely to tables. You learned how to create PdfPTable and PdfPCell objects. You were made aware of the PdfPRow class, but you know that you shouldn t worry about it: rows are created behind the scenes by iText. You learned how to define the width, alignment, and spacing of the complete table and its columns, and you discovered that cells are very similar to the ColumnText object that was discussed in the previous chapter. You ve worked with cells in text mode and in composite mode. In the subsection about text mode, you learned more about the properties of a cell. The section with the examples in composite mode focused on special types of cells: cells with images, and cells containing other tables (nested tables). As soon as you have a table that spans multiple pages, you need to pay special attention to headers and footers if you want them to repeat on every page. You also have to choose whether you want to split the cells of a row if they don t fit on the current page, or if you want to forward them to the next page. You also learned about the implications on your JVM of having a large table; you learned how to reduce the maximum amount of memory needed when dealing with a large table. Finally, you added a PdfPTable at absolute coordinates in two different ways: with the writeSelectedRows() method, and by wrapping the table inside a ColumnText object. In the next chapter, you ll learn how to fine-tune the layout by using table and cell events.
Table, cell, and page events
This chapter covers
Cell and table events Events for Chunks, Paragraphs, s, and Sections Page boundaries Adding headers, footers, and watermarks using page events
In chapters 2 and 4, you added content to a document using a plethora of objects and methods available in iText. When adding a Chunk, you were able to use methods to add lines and a background color. When creating a PdfPTable, you could define borders and backgrounds. But what if all of this isn t sufficient What if you don t want a rectangular background for a Chunk, but a custom shape instead, such as an ellipse What if you want the borders of a PdfPCell to have rounded corners This chapter explains how to write custom functionality for Chunk, Paragraph, , Section, PdfPTable, and PdfPCell objects.
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