ComboBoxRenderer不能转换为TableCellRenderer

Question

我尝试创建一个组合框并添加到我的表列中。我使用这个示例。当我尝试做col5.setCellRenderer(cmbRender);时，它会抛出：

"ComboBoxRenderer不能转换为TableCellRenderer“。

ComboxRenderer

class ComboBoxRenderer extends JLabel
                           implements ListCellRenderer {
        private Font uhOhFont;

        public ComboBoxRenderer() {
            setOpaque(true);
            setHorizontalAlignment(CENTER);
            setVerticalAlignment(CENTER);
        }
        public Component getListCellRendererComponent(
                                           JList list,
                                           Object value,
                                           int index,
                                           boolean isSelected,
                                           boolean cellHasFocus) {

            int selectedIndex = ((Integer)value).intValue();

            if (isSelected) {
                setBackground(list.getSelectionBackground());
                setForeground(list.getSelectionForeground());
            } else {
                setBackground(list.getBackground());
                setForeground(list.getForeground());
            }
            String[] petStrings = {"Bird", "Cat", "Dog", "Rabbit", "Pig"};
            String pet = petStrings[selectedIndex];
            setUhOhText(pet + " (no image available)",
            list.getFont());           
            return this;
        }
        protected void setUhOhText(String uhOhText, Font normalFont) {
            if (uhOhFont == null) { //lazily create this font
                uhOhFont = normalFont.deriveFont(Font.ITALIC);
            }
            setFont(uhOhFont);
            setText(uhOhText);
        }
    }

我试着像这样打电话

         ComboBoxRenderer cmbRender = new ComboBoxRenderer();
         TableColumn col5 = jTable1.getColumnModel().getColumn(4);
         col5.setCellRenderer(cmbRender);// give me error here

我想在表列中创建值，并在petString中分配值。请指点。

这就是我为TextBox所做的

TextRenderer2 renderer2 = new TextRenderer2();
TableColumn col5 = jTable1.getColumnModel().getColumn(4);
MyTableCellEditor editor = new MyTableCellEditor();
col5.setCellEditor(editor);
col5.setCellRenderer(renderer2);
col5.setPreferredWidth(100);

TextRenderer

class TextRenderer2 extends JLabel implements TableCellRenderer {

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) 
        {
            JPanel jp_panel = new JPanel();

            JTextPane jta_text = new JTextPane();
            JScrollPane jsp_scroll = null;

            String valStr = value.toString();
            jta_text.setText(valStr);

            jp_panel.setLayout(new BorderLayout());
            jsp_scroll = new JScrollPane(jta_text);
            jp_panel.add(jsp_scroll, BorderLayout.CENTER);

            return jp_panel;
        }
    }

Answer 1

将实现ListCellRenderer更改为实现TableCellRenderer

class ComboBoxRenderer extends JComboBox implements TableCellRenderer {

        public ComboBoxRenderer(Object[] items) {
        super(items);
    }

    private static final long serialVersionUID = 1L;



    @Override
    public Component getTableCellRendererComponent(JTable table, Object value,
        boolean isSelected, boolean hasFocus, int row, int column) {
        if (isSelected) {
            setForeground(table.getSelectionForeground());
            super.setBackground(table.getSelectionBackground());
        } else {
            setForeground(table.getForeground());
            setBackground(table.getBackground());
        }
        // Select the current value
        setSelectedItem(value);
        return this;
    }
    }