Put JTable in the JTree

Question

in connection with thread Jtable as a Jtree Node I put JTable to JTree, but JTree View isn\'t rendered correctly on start_up, how can I setPreferredSize

Answer 1

Get rid of the scrollPane, it's dysfunctional anyway (so far I agree with Russell :-) and add the table and its header to the panel, using an appropriate LayoutManager:

public MyTableInTreeCellRenderer() {
    super();
    setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
    table = new JTable();
    add(table.getTableHeader());
    add(table);
}

you'll probably need to tweak the visuals a bit, the left and top border lines are missing - not entirely sure which component paints them normally, could be the scrollPane

Edit

Forgot: the reason querying the scrollPane's prefSize in calculating the required size (done in the ui delegate, namely the VariableHeightLayoutCache) of the rendering component is that the scrollPane not yet configured with the header. The query happens before the panel is added to the rendererPane, the complete configuration is done in the table's addNotify which happens only after adding the panel to the hierarchy

Answer 2

You might just get rid of the ScrollPane and lay out the header and table in the panel directly (with a null LayoutManager so you can control everything yourself):

static class TableTreeCellRenderer extends JPanel implements TreeCellRenderer {
    private final JTable table;

    TableTreeCellRenderer() {
        table = new JTable();
        setLayout(null);
        add(table.getTableHeader());
        add(table);
    }

    public Dimension getPreferredSize() {
        Dimension headerSize = table.getTableHeader().getPreferredSize();
        Dimension tableSize = table.getPreferredSize();

        return new Dimension(Math.max(headerSize.width, tableSize.width),
                headerSize.height + tableSize.height);
    }

    public void setBounds(int x, int y, int width, int height) {
        super.setBounds(x, y, width, height);
        int headerHeight = table.getTableHeader().getPreferredSize().height;
        table.getTableHeader().setBounds(0, 0, width, headerHeight);
        table.setBounds(0, headerHeight, width, height - headerHeight);
    }

    public Component getTreeCellRendererComponent(JTree tree, Object value,
            boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        final String v = (String) ((DefaultMutableTreeNode) value).getUserObject();
        table.setModel(new DefaultTableModel(new Object[][] { 
                { v + "0", "1" },
                { v + "2", "3" }
        }, new Object[] { "id", "value" } ));
        invalidate();
        return this;
    }
}