Auto adjust the height of rows in a JTable

In a JTable, how ca开发者_C百科n I make some rows automatically increase height to show the complete multiline text inside? This is how it is displayed at the moment:

I do not want to set the height for all rows, but only for the ones which have multiline text.

The only way to know the row height for sure is to render each cell to determine the rendered height. After your table is populated with data you can do:

private void updateRowHeights()
{
    for (int row = 0; row < table.getRowCount(); row++)
    {
        int rowHeight = table.getRowHeight();

        for (int column = 0; column < table.getColumnCount(); column++)
        {
            Component comp = table.prepareRenderer(table.getCellRenderer(row, column), row, column);
            rowHeight = Math.max(rowHeight, comp.getPreferredSize().height);
        }

        table.setRowHeight(row, rowHeight);
    }
}

If only the first column can contain multiple line you can optimize the above code for that column only.

Camickr's solution did not work for me at all. My data model was dynamic though - it changed all the time. I guess the mentioned solution works for static data, like coming from an array.

I had JPanel for cell renderer component and it's preferred size wasn't set correctly after using prepareRenderer(...). The size was set correctly after the containing window was already visible and did repaint (2 times in fact after some unspecified, though short time). How could I call updateRowHeights() method shown above then and where would I do this? If I called it in (overriden) Table.paint() it obviously caused infinite repaints. It took me 2 days. Literally. The solution that works for me is this one (this is the cell renderer I used for my column):

public class GlasscubesMessagesTableCellRenderer extends MyJPanelComponent implements TableCellRenderer {

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
            int row, int column) {
        //this method updates GUI components of my JPanel based on the model data
        updateData(value);
        //this sets the component's width to the column width (therwise my JPanel would not properly fill the width - I am not sure if you want this)
        setSize(table.getColumnModel().getColumn(column).getWidth(), (int) getPreferredSize().getHeight());

        //I used to have revalidate() call here, but it has proven redundant

        int height = getHeight();
        // the only thing that prevents infinite cell repaints is this
        // condition
        if (table.getRowHeight(row) != height){
            table.setRowHeight(row, height);
        }
        return this;
    }
}

You must iterate over each row, get the bounding box for each element and adjust the height accordingly. There is no code support for this in the standard JTable (see this article for a solution for Java ... 1.3.1 =8*O).