Swing/CheckedRowColor のバックアップ(No.1)

TITLE:JTableのセルにJCheckBoxを表示して行背景色を変更

JTableのセルにJCheckBoxを表示して行背景色を変更

Posted by terai at 2008-07-14

概要

JTableのセルに表示されているJCheckBoxがチェックされていれば、その行の背景色を変更します。

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#screenshot

サンプルコード

JTable table = new JTable(model) {
    @Override
    public Component prepareEditor(TableCellEditor editor, int row, int column) {
        Component cmp = super.prepareEditor(editor, row, column);
        if(convertColumnIndexToModel(column) == BOOLEAN_COLUMN) {
            //System.out.println("JTable: prepareEditor");
            JCheckBox c = (JCheckBox)cmp;
            c.setBackground(c.isSelected()? Color.ORANGE:getBackground());
        }
        return cmp;
    }
    @Override
    public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
        Component c = super.prepareRenderer(renderer, row, column);
        Boolean isChecked = (Boolean) model.getValueAt(
            convertRowIndexToModel(row), BOOLEAN_COLUMN);
        c.setForeground(getForeground());
        c.setBackground(isChecked? Color.ORANGE:getBackground());
        return c;
    }
};

解説

上記のサンプルでは、JTableのprepareEditor、prepareRendererをオーバーライドしてセルエディタや行の背景色を変更しています。

以下のように、TableCellRendererやCellEditorを利用して、JTableをオーバーライドしない方法*1もあります。

private static JTable makeTable2(final DefaultTableModel model) {
    final JTable table = new JTable(model);
    TableColumnModel columns = table.getColumnModel();
    for(int i=0;i<columns.getColumnCount();i++) {
        columns.getColumn(i).setCellRenderer(new RowColorTableRenderer(
            table.getDefaultRenderer(model.getColumnClass(i))));
    }
    DefaultCellEditor dce = (DefaultCellEditor)table.getDefaultEditor(model.getColumnClass(BOOLEAN_COLUMN));
    final JCheckBox check = (JCheckBox)dce.getComponent();
    check.addFocusListener(new FocusAdapter() {
        @Override
        public void focusGained(FocusEvent e) {
            System.out.println("JCheckBox: focusGained");
            JCheckBox c = (JCheckBox)e.getSource();
            c.setBackground(c.isSelected()?Color.ORANGE:table.getBackground());
        }
    });
    table.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent e) {
            int col = table.columnAtPoint(e.getPoint());
            if(table.convertColumnIndexToModel(col)==BOOLEAN_COLUMN) {
                System.out.println("JTable: mousePressed");
                int row = table.rowAtPoint(e.getPoint());
                Boolean isChecked = (Boolean) model.getValueAt(table.convertRowIndexToModel(row), BOOLEAN_COLUMN);
                check.setBackground(isChecked?Color.ORANGE:table.getBackground());
            }
        }
    });
    return table;
}
static class RowColorTableRenderer implements TableCellRenderer {
    private final Color evenColor = new Color(240, 240, 255);
    private final TableCellRenderer renderer;
    public RowColorTableRenderer(TableCellRenderer renderer) {
        this.renderer = renderer;
    }
    public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {
        Component c = renderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        TableModel model = table.getModel();
        Boolean isChecked = (Boolean) model.getValueAt(table.convertRowIndexToModel(row), BOOLEAN_COLUMN);
        c.setForeground(table.getForeground());
        c.setBackground(isChecked?Color.ORANGE:table.getBackground());
        return c;
    }
}

参考リンク

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