Question

I have a JTable with a custom Cell Renderer for multi-line cells. Everything is ok, the JTable is painted ok in the screen and I am very happy with it, but ast night when I tried to simply print it, I came up with a very strange issue. Using:

table.print(PrintMode.FIT_WIDTH, new MessageFormat(“…”), new MessageFormat(“…”));

I saw that the table did not print entirely. Then using another class made from a colleague for printing JTables I had the same result:

The table (with multi-line cells) needed 22 pages to print. The printed document (which I only viewed in xps format since I do not own a printer) had also 22 pages. But up to page 16 everything was printed as expected and after that only the borders and the column headers of the table were printed.

Strangely (to me) enough, when I tried to print the table using another cell renderer that does not allow for multi line cells, the table needed exactly 16 pages and was printed entirely, albeit the cropping in the lengthy cell values.

I searched all over the net but I had no luck. Does anybody know why could this be happening? Is there a solution?

Update:

My cell renderer is the following:

public class MultiLineTableCellRenderer extends JTextPane implements TableCellRenderer {
private List<List<Integer>> rowColHeight = new ArrayList<List<Integer>>();

public MultiLineTableCellRenderer() {
    setOpaque(true);
}

public Component getTableCellRendererComponent(
        JTable table, Object value, boolean isSelected, boolean hasFocus,
        int row, int column) {
    String s = (String)value;
    if (s.equals("<περιοδάριθμος>")) {
        setForeground(Color.blue);
    }
    else if(s.equals("<παραγραφάριθμος>")) {
        setForeground(Color.red);
    }
    else {
        setForeground(Color.black);
    }
    setBackground(new Color(224, 255, 255));
    if (isSelected) {
         setBackground(Color.GREEN);
    }
    setFont(table.getFont());
    setFont(new Font("Tahoma", Font.PLAIN, 10));
    if (hasFocus) {
        setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
        if (table.isCellEditable(row, column)) {
            setForeground(UIManager.getColor("Table.focusCellForeground"));
            setBackground(UIManager.getColor("Table.focusCellBackground"));
        }
    } else {
        setBorder(new EmptyBorder(1, 2, 1, 2));
    }
    if (value != null) {
        setText(value.toString());
    } else {
        setText("");
    }
    adjustRowHeight(table, row, column);

    SimpleAttributeSet bSet = new SimpleAttributeSet();
    StyleConstants.setAlignment(bSet, StyleConstants.ALIGN_CENTER);
    StyleConstants.setFontFamily(bSet, "Tahoma");
    StyleConstants.setFontSize(bSet, 11);
    StyledDocument doc = getStyledDocument();
    doc.setParagraphAttributes(0, 100, bSet, true);
    return this;
}

private void adjustRowHeight(JTable table, int row, int column) {
    int cWidth = table.getTableHeader().getColumnModel().getColumn(column).getWidth();
    setSize(new Dimension(cWidth, 1000));
    int prefH = getPreferredSize().height;
    while (rowColHeight.size() <= row) {
        rowColHeight.add(new ArrayList<Integer>(column));
    }
    List<Integer> colHeights = rowColHeight.get(row);
    while (colHeights.size() <= column) {
        colHeights.add(0);
    }
    colHeights.set(column, prefH);
    int maxH = prefH;
    for (Integer colHeight : colHeights) {
        if (colHeight > maxH) {
            maxH = colHeight;
        }
    }
    if (table.getRowHeight(row) != maxH) {
        table.setRowHeight(row, maxH);
    }
}

}

Furthermore, if you test the following very simple example you will notice that something is terribly wrong with the printing, but I really can’t find what!

public static void main(String[] args) throws PrinterException {
  DefaultTableModel model = new DefaultTableModel();
  model.addColumn("col1");
  model.addColumn("col2");
  model.addColumn("col3");
  int i = 0;
  for (i = 1; i <= 400; i++) {
     String a = "" + i;
     model.addRow(new Object[]{a, "2", "3"});
  }
  JTable tab = new JTable(model);
  tab.print();
}

Answer 1

I believe you are having the same problem that I had when I asked this question:

Truncated JTable print output

I found a solution to my problem, and I believe it may help you as well.
The answer is here:
Truncated JTable print output

To summarize my answer:

If your TableCellRenderer is the only place in your code where you are setting rows to their correct height, then you are going to run into trouble caused by an optimization inside JTable: JTable only invokes TableCellRenderers for cells that have been (or are about to be) displayed.

If not all of your cells have been displayed on-screen, then not all of your renderers have been invoked, and so not all of your rows have been set to the desired height. With your rows not being their correct height, your JTable overall height is incorrect. After all, part of determining the overall JTable height is accounting for the height of each of that table’s rows. If the JTable overall height isn’t correct, this causes the print to truncate, since the JTable overall height is a parameter that is considered in the print layout logic.

An easy (but perhaps not squeaky clean) way to fix this is to visit all of your cell renderers manually before printing. See my linked answer for an example of doing this. I actually chose to do the renderer visitation immediately after populating my table with data, because this fixes some buggy behavior with the JTable’s scrollbar extents (in addition to fixing the printing.)

The reason the table looks and works OK on-screen even when printing is broken, is because as you scroll around in the table, the various renderers are invoked as new cells come on screen, and the renderers set the appropriate row height for the newly visible rows, and various dimensions are then are recalculated on the fly, and everything works out OK in the end as you interact with the table. (Although you may notice that the scrollbar “extent” changes as you scroll around, which it really shouldn’t normally do.)