How to Add a Select All/None Control to a JTable Header?

How to Embed a Control in the Header of a JTable

Inserting a control into the header of a JTable allows for convenient management of column data, such as selecting all or none of the checkboxes in a Boolean column. Here's a comprehensive approach that addresses the need for a well-behaved control in the JTable header.

Implementation using SelectAllHeader Class

The SelectAllHeader class extends JToggleButton and implements TableCellRenderer to create a toggle button that controls the checkboxes in a specified Boolean column. When the toggle button is clicked, it sets all the checkboxes in that column to the selected or deselected state.

class SelectAllHeader extends JToggleButton implements TableCellRenderer {

    private static final String ALL = "✓ Select all";
    private static final String NONE = "✓ Select none";
    // ...

    public SelectAllHeader(JTable table, int targetColumn) {
        // ...
    }

    @Override
    public Component getTableCellRendererComponent(
        JTable table, Object value, boolean isSelected,
        boolean hasFocus, int row, int column) {
        return this;
    }
    // ...
}

Usage

To use this control, add it as a header renderer to the specified column:

TableColumn tc = table.getColumnModel().getColumn(BOOLEAN_COL);
tc.setHeaderRenderer(new SelectAllHeader(table, BOOLEAN_COL));

Additional Features

The SelectAllHeader class checks the state of the checkboxes in the column and toggles its own state accordingly. It also handles mouse events to ensure that the toggle button is clicked only on the desired column.

Conclusion

By utilizing the SelectAllHeader class, you can easily embed a well-behaved control in the header of a JTable, providing a convenient way to select or deselect all the checkboxes in a Boolean column. This approach is flexible and can be applied to any column that uses a checkbox renderer.

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