java - 尝试为 JTable 中的特定单元格着色... getTableCellRendererComponent Overide

Question

所以我知道这可能是一个重复的问题，但我已经浏览了许多已经在这里的问题，但似乎没有一个对我有用，所以我想我会发布我自己的问题，希望其他一些人遇到问题有了这个也会发现这很有帮助。

这是我的代码

    table.getColumn("Name").setCellRenderer(
                new DefaultTableCellRenderer() {
                    @Override
                    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                        setText(value.toString());

                        if (row==3) 
                        {
                            setForeground(Color.RED);
                        }
                        return this;
                    }
                }
            );

这是 JFrame 中显示的内容。如您所见，我试图只为“名称”列第三行中的文本着色，但它为整行着色。

有什么建议么？谢谢！迦南

Answer 1

The render is unique for column "Name". You are setting Red as foreground color when row is 3 but you dont reset it for others rows, so when painter is called it always paint red. You have to set red when row is 3 but you also have to reset the original color in other case.

EDITED: Performed version. Now original foreground color is backed up, and super is used to render like others columns.

           table.getColumn("Name").setCellRenderer(
            new DefaultTableCellRenderer() {

        Color originalColor = null;

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            DefaultTableCellRenderer renderer = (DefaultTableCellRenderer) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            if (originalColor == null) {
                originalColor = getForeground();
            }
            if (value == null) {
                renderer.setText("");
            } else {
                renderer.setText(value.toString());
            }

            if (row == 3) {
                renderer.setForeground(Color.RED);
            } else {
                renderer.setForeground(originalColor); // Retore original color
            }
            return renderer;
        }
    });