排序后禁用JTableHeader更新

Question

我定制了一个带有tablecellrenderer的JTable标头，因此会出现过滤器图标，并且当用户单击过滤器图标时，出现像Excel的弹出滤镜（图1）。但是，如果用户单击标题的文本，则使用了一个行分落器。当应用行选拔器（图2）时，它覆盖自定义和过滤器图标消失。是否有一种方法可以避免在将行分隔器保存在桌标题上的同时？

Answer 1

您可以通过使用自定义渲染标头的原始渲染器进行装饰，从而添加所需的过滤图标。

例如，遵循一些代码在原始列标头旁边添加自己的标签时保留排序图标：

import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.util.Objects;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;

public class Main {
    
    private static class MyTableCellRenderer extends DefaultTableCellRenderer {
        
        private final TableCellRenderer originalRenderer;
        
        public MyTableCellRenderer(final TableCellRenderer originalRenderer) {
            this.originalRenderer = Objects.requireNonNull(originalRenderer);
        }

        @Override
        public Component getTableCellRendererComponent(final JTable table,
                                                       final Object value,
                                                       final boolean isSelected,
                                                       final boolean hasFocus,
                                                       final int row,
                                                       final int column) {
            final Component original = originalRenderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            
            if (row >= 0) //The header will have a row equal to -1.
                return original;
            
            final JPanel container = new JPanel(new FlowLayout(FlowLayout.CENTER, 10, 0));
            final JLabel filtering = new JLabel("Filter", JLabel.CENTER); //Your icon should go in this label...
            
            //Put some fancy background to make the positioning of the label clear:
            filtering.setOpaque(true);
            filtering.setBackground(Color.CYAN);
            
            //The default renderer comes with a border... Let's apply the border to the whole new container:
            if (original instanceof JComponent) {
                container.setBorder(((JComponent) original).getBorder());
                ((JComponent) original).setBorder(null);
            }
            
            container.add(filtering);
            container.add(original);
            
            return container;
        }
    }
    
    private static void createAndShowGUI() {
        final JTable table = new JTable(new Object[][] {
            new Object[]{"Data001", "Data002", "Data003"},
            new Object[]{"Data011", "Data012", "Data013"},
            new Object[]{"Data021", "Data022", "Data023"},
            new Object[]{"Data031", "Data032", "Data033"},
            new Object[]{"Data041", "Data042", "Data043"}
        }, new Object[] {"Column1", "Column2", "Column3"});
        
        table.setAutoCreateRowSorter(true);

        final JTableHeader header = table.getTableHeader();
        header.setDefaultRenderer(new MyTableCellRenderer(header.getDefaultRenderer()));
        
        final JFrame frame = new JFrame("Table header");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(new JScrollPane(table));
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
    
    public static void main(final String[] args) {
        SwingUtilities.invokeLater(Main::createAndShowGUI);
    }
}

而不是单词 filter （显示在每个列标题上）您可以在改为创建标签。

参考：

1. source部分： 3。
2. 我如何在JTable的JTableHeader？