Question

I am using this JTable method to create a Cell with a JComboBox as their rendered appearance.

public void addComboBoxToColumn(String[] options, int column_index){
    ComboTableCellRenderer renderer = new ComboTableCellRenderer();
    JComboBox<String> combo = new JComboBox<String>(options);
    TableCellEditor combo_editor  = new DefaultCellEditor(combo);
    TableColumn column = getColumnModel().getColumn(column_index);
    column.setCellRenderer(renderer);
    column.setCellEditor(combo_editor);     
}

…

public class ComboTableCellRenderer implements ListCellRenderer, TableCellRenderer 
{
    DefaultListCellRenderer listRenderer = new DefaultListCellRenderer();
    DefaultTableCellRenderer tableRenderer = new DefaultTableCellRenderer();

    private void configureRenderer(JLabel renderer, Object value)
    {
        if (value != null)
            renderer.setText((String)value);
    }

    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
    {
        listRenderer = (DefaultListCellRenderer)listRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
        configureRenderer(listRenderer, value);
        return listRenderer;
    }

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
    {
        tableRenderer = (DefaultTableCellRenderer)tableRenderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        configureRenderer(tableRenderer, value);
        return tableRenderer;
    }

}

My problem is that the combobox is always the size of the cell. I do not want that. Is it possible to make the combo box bigger? Some options in the combobox are too big and are half-hidden.

Answer 1

My problem is that the combobox is always the size of the cell. I do
not want that. Is it possible to make the combo box bigger? Some
options in the combobox are too big and are half-hidden.

• not possible without jumping of cell Dimmension on the Screen, don’t to confuse the user

• to avoiding possible side effects, I’d be

• create popup undecorated JDialog (for editable JComboBox), JWindow, put there JComboBox

• add ListSelectionListener (have to change ListSelectionMode to SINGLE)

• change built in KeyBinding in JTable for TableCellEditor (double_click or F2) to showing JDialog/JWindow have to center to the desired Point on the scren, setVisible must be wrapped in invokeLater

• add ItemListener, test for SELECTED, on selected to store value to (setValueAt()) XxxTableModel, then to hide JDialog/JWindow

• use only one JDialog (reuse by removeAll from content pane for another action from GUI) for whole JVM instance, only one for JTable