jtable column size

[sudheer kiran]

hi all
i have a jtable,i want to have all columns Width to be the size of contents in rows.
if anything added in row then the column width should increase to fit that value.
any suggestion please.

[Rob Spoor]

TableColumn has methods for setting the preferred, minimum and maximum widths. That leaves calculating the sizes based on the contents, and that's where the renderer can help you out.

Loop through the table, get a renderer and editor for each cell, get its component and get its preferred size:

for (int row = 0; row < table.getRowCount(); row++)
{
    for (int col = 0; col < table.getColumnCount(); col++)
    {
        Object value = table.getValueAt(row, col);
        int rendererWidth = table.getCellRenderer(row, col).getTableCellRendererComponent(table, value, true, true, row, col).getPreferredSize().width;
        int editorWidth = table.getCellEditor(row, col).getTableCellEditorComponent(table, value, true, row, col).getPreferredSize().width;
    }
}

I've chosen to use the widths of both the renderer and editor, and for selected cells with focus, as these tend to give the largest results. Now just use the maximum value per column as the minimum width for the entire column.

That leaves setting the auto resize mode for the table; if your minimum widths don't fit you'll run into problems if you have the auto resize mode set to anything but AUTO_RESIZE_OFF.

Oh, I forgot about the changing of values. Just override setValueAt of the JTable (so you'll have a JTable subclass, probably anonymous):

@Override
public void setValueAt(Object value, int row, int col)
{
    super.setValueAt(value, row, col);
    // calculate new minimum width for the cell
    // set TableColumn's minimum width to be the maximum of its old minimum width and the new minimum width
}

[Rob Camick]

Table Column Adjuster

[sudheer kiran]

very much thanks you all..your replies are very much useful for me