TableEx In-Situ Editing Tutorial

Added by Tim Hamblin, last edited by Tim Hamblin on Oct 01, 2007  (view change)

Overview

This article demonstrates how to create a simple table to display strings, checkboxes and comboboxes.

Creating a table.

Firstly we need to create a table with some data in it. The table will contain three columns - a string, a checkbox and a combobox.

DefaultTableModel tableModel = new DefaultTableModel();
 tableModel.setColumnCount(3);

 tableModel.addRow(new Object[] {new String("Row 0"), new CheckBox(), new ComboBox(new Object[] {new String("String 1"), new String("String 2"), new String("String 3") } ) } );
 ...

 TableEx table = new TableEx(tableModel);

At this stage only the column containing the string will be displayed correctly as the default cell renderer will try to render the checkbox and combobox as strings.

Rendering a table.

To render the objects within the table correctly we need to create a custom cell renderer that determines what each of the objects should look like. This is a simple as checking what type the object is and casting it to the desired component, therefore using the components renderer to display it in the table.

table.setDefaultRenderer(Object.class, new TableCellRenderer() {
    public Component getTableCellRendererComponent(Table table, Object value, int column, int row) {
        if (value instanceof CheckBox) {
            return (CheckBox)value;
        } else if (value instanceof ComboBox) {
            return (ComboBox)value;
        } else if (value != null) {
            return new Label(value.toString());
        }
        return new Label();
    }
 });

Using the custom cell renderer the checkbox and combobox columns will be rendered correctly.

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