java - JTable 单元格颜色

Question

有人能给我一个如何获取 JTable 中特定单元格的背景颜色的示例吗？我无法找到如何执行此操作的示例。有很多关于获取单元格中的值的示例，但不是获取单元格的背景颜色。

Answer 1

它应该类似于以下内容(根据所有评论修复):

重要:使用 table.prepareRenderer(...) 让 JTable 为您完成所有工作

public Color getTableCellBackground(JTable table, int row, int col) {
    TableCellRenderer renderer = table.getCellRenderer(row, col);
    Component component = table.prepareRenderer(renderer, row, col);
    return component.getBackground();
}

完整演示:

public class TableRenderDemo extends JPanel {

    public TableRenderDemo() {
        super(new GridLayout(1, 0));

        final JTable table = new JTable(new MyTableModel());
        table.setPreferredScrollableViewportSize(new Dimension(600, 200));
        table.setFillsViewportHeight(true);
        table.setDefaultRenderer(Object.class, new MyRenderer());

        table.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent e) {
                int row = table.getSelectedRow();
                int col = table.getSelectedColumn();

                JOptionPane.showInternalMessageDialog(TableRenderDemo.this,
                        "Color: " + getTableCellBackground(table, row, col));

                System.out.println("Color: " + getTableCellBackground(table, row, col));
            }
        });

        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane);
    }

    public Color getTableCellBackground(JTable table, int row, int col) {
        TableCellRenderer renderer = table.getCellRenderer(row, col);
        Component component = table.prepareRenderer(renderer, row, col);    
        return component.getBackground();
    }

    class MyRenderer implements TableCellRenderer {

        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
                boolean hasFocus, int row, int column) {
            JTextField editor = new JTextField();
            if (value != null) {
                editor.setText(value.toString());
            }
            editor.setBackground((row % 2 == 0) ? Color.white : Color.BLUE);
            return editor;
        }
    }

    class MyTableModel extends AbstractTableModel {

        private String[] columnNames = {"First Name",
            "Last Name",
            "Sport",
            "# of Years",
            "Vegetarian"};
        private Object[][] data = {
            {"Kathy", "Smith",
                "Snowboarding", new Integer(5), new Boolean(false)},
            {"John", "Doe",
                "Rowing", new Integer(3), new Boolean(true)},
            {"Sue", "Black",
                "Knitting", new Integer(2), new Boolean(false)},
            {"Jane", "White",
                "Speed reading", new Integer(20), new Boolean(true)},
            {"Joe", "Brown",
                "Pool", new Integer(10), new Boolean(false)}
        };
        public final Object[] longValues = {"Jane", "Kathy",
            "None of the above",
            new Integer(20), Boolean.TRUE};

        public int getColumnCount() {
            return columnNames.length;
        }

        public int getRowCount() {
            return data.length;
        }

        public String getColumnName(int col) {
            return columnNames[col];
        }

        public Object getValueAt(int row, int col) {
            return data[row][col];
        }
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("TableRenderDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        TableRenderDemo newContentPane = new TableRenderDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                createAndShowGUI();
            }
        });
    }
}