Nimbus TableHeader was not highlighted as 'pressed'

Question

The JTableHaeder has no \'pressed\' highlighting by default. (Nimbus)

NimbusDefaults says it has a default [Pressed] background painter.

What should I do, to

Answer 1

technically, you need that state on the rendering component, not on the JTableHeader itself:

    @Override
    public void mousePressed( MouseEvent e ) {
        JComponent source = (JComponent)e.getComponent();
        source.putClientProperty( "Nimbus.State", "Pressed" );
        if (source instanceof JTableHeader) {
            ((JComponent) ((JTableHeader) source).getDefaultRenderer())
                .putClientProperty("Nimbus.State", "Pressed");
        }
    }

Problem then is that the same instance (of rendering component) is used for all columns, so if you drag a column all appear pressed ...

Edit: couldn't resist to dig a bit ... Nimbus is soooo ... lacking, to put it mildly ;-)

Turns out that the defaults indeed have the styles for pressed, what's missing is the logic to set it. Probably not entirely trivial, because the logic (aka: MouseListener) resides in BasicTableHeaderUI which doesn't know about subclass' painter states. The only thingy the logic is supporting (hot needle fix) is rollover-awareness, but not pressed-ness.

While we can't hook into the logic (well, we could ... but that's another trick :-) we can look for secondary state changes like draggingColumn/resizingColumn (not-bound) properties in JTableHeader and let a custom renderer update itself as appropriate. Here's a line-out of how-to:

public static class WrappingRenderer implements TableCellRenderer {

    private DefaultTableCellHeaderRenderer delegate;
    private JTableHeader header;

    public WrappingRenderer(JTableHeader header) {
        this.header = header;
        this.delegate = (DefaultTableCellHeaderRenderer) header.getDefaultRenderer();
        header.setDefaultRenderer(this);
    }

    @Override
    public Component getTableCellRendererComponent(JTable table,
            Object value, boolean isSelected, boolean hasFocus, int row,
            int column) {
        Component comp = delegate.getTableCellRendererComponent(table, 
                value, isSelected, hasFocus, row, column);
        TableColumn draggedColumn = table.getTableHeader().getDraggedColumn();
        if (draggedColumn != null) {
            if (table.convertColumnIndexToModel(column) == draggedColumn.getModelIndex()) {
                setNimbusState("Pressed");
            } else {
                setNimbusState(null);
            }

        } else {
            setNimbusState(null);
        }
        // do similar for resizing column
        return comp;
    }

    public void setNimbusState(String state) {
        delegate.putClientProperty("Nimbus.State", state);
    }
}