How to wrap lines in a jtable cell?

Question

I\'m trying to implement a custom TableRenderer as described in this tutorial. I\'d like to have the renderer line-wrap each text that is to long for the given cell. The i

Answer 1

As noted above the row height needs to be calculated but the current solution could be improved. In fact, it wasn't working for me. jtxt.getColumns() was returning zero causing a divide by zero. Here's some code I think is cleaner:

// set the width on the jTextArea causing a calc of preferred height
jtxt.setSize(table.getWidth(), Short.MAX_VALUE);
int prefH = jtxt.getPreferredSize().height;
table.setRowHeight(row, prefH);

Answer 2

In addition to this question I'd like to share with you solution for multiline cell editor. It's a bit hacky (stores reference to edited row), but does the job.

import javax.swing.*;
import javax.swing.table.TableCellEditor;
import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

class MultilineTableCellEditor extends AbstractCellEditor implements TableCellEditor {

    JComponent component = new JTextArea();
    JTable table;
    int lastRowIndex;

    public MultilineTableCellEditor() {
        JTextArea textArea = ((JTextArea) component);
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        textArea.addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                super.componentResized(e);
                table.setRowHeight(lastRowIndex, (int) (textArea.getPreferredSize().getHeight()));
            }
        });
        textArea.addKeyListener(new KeyAdapter() {
            @Override
            public void keyTyped(KeyEvent e) {
                super.keyTyped(e);
                table.setRowHeight(lastRowIndex, (int) (textArea.getPreferredSize().getHeight()));
            }
        });
    }

    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected,
                                                 int rowIndex, int vColIndex) {
        this.table = table;
        lastRowIndex = rowIndex;

        ((JTextArea) component).setText((String) value);
        component.setFont(table.getFont());

        return component;
    }

    public Object getCellEditorValue() {
        return ((JTextArea) component).getText();
    }
}

Used as so:

    JTable table = new JTable(tableModel) {
        // Cell renderer by Alessandro Rossi (posted as solution to this question)
        MultilineTableCell renderer = new MultilineTableCell();
        MultilineTableCellEditor editor = new MultilineTableCellEditor();

        @Override
        public TableCellRenderer getCellRenderer(int row, int column) {
            if (column == multilineColumn) {
                return renderer;
            }
            return super.getCellRenderer(row, column);
        }

        @Override
        public TableCellEditor getCellEditor(int row, int column) {
            if ( column == multilineColumn ) {
                return editor;
            }
            return super.getCellEditor(row, column);
        }
    };