JTable AutoCreateRowSorter 导致 Swing 绘制表格错误

Question

我在 java 中创建了一个 JTable，并使用 AutoCreateRowSorter 方法来帮助对表的列进行排序。

问题是当我单击列标题对表格进行排序时，它会错误地重新绘制表格。显示的第一张图片是打开时的外观。第二张图片显示了当我单击一次时会发生什么。请注意数据与列标题重叠。

Initial JTable

Repainted JTable

public class DataTable {
    String[] colNames = {"Aircraft",
             "Track ID",
             "Runway",
             "Operation Type",
             "Number Daily of Operations"};

    public DataTable(){}

    public static void main(String[] args) {
        DataTable tble = new DataTable();
        JFrame window = new JFrame();
        window.setBounds(0, 10, 1000,700);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.getContentPane().setLayout(new BorderLayout(0, 0));
        window.setContentPane(tble.getfinalPane());
        window.setVisible(true);
    }

    public JPanel getfinalPane(){
        JPanel panel = new JPanel();
        panel.setLayout(new GridBagLayout());

        GridBagConstraints b = new GridBagConstraints();
        b.gridx = 0;
        b.gridy = 0;
        b.fill = GridBagConstraints.BOTH;
        b.anchor = GridBagConstraints.FIRST_LINE_END;
        b.weighty = 500;
        panel.add(getTable(),b);

        return panel;
    }

    public JScrollPane getTable(){
        Object[][] data = {{"Boeing 717",(long) 2459,"01L","Arrival",0.13},{"Boeing 727",(long) 2439,"01R","Arrival",0.12}};
        JTable table = new JTable(data,colNames);
        table.setFont(new Font("Serif",Font.BOLD,20));
        table.getTableHeader().setFont(new Font("Serif",Font.BOLD,20));
        table.getTableHeader().setBackground(new Color(0,0,0,100));
        table.getTableHeader().setBorder(BorderFactory.createMatteBorder(3, 3, 3, 3, Color.BLACK));
        table.getTableHeader().setForeground(Color.WHITE);
        table.setRowHeight(table.getRowHeight()+table.getFont().getSize());
        table.setBackground(new Color(214, 217, 223));
        table.setAutoCreateRowSorter(true);
        DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
        centerRenderer.setHorizontalAlignment(SwingConstants.CENTER);

        for(int i = 0; i < colNames.length; i++){
            table.getColumnModel().getColumn(i).setCellRenderer(centerRenderer);
        }

        JScrollPane scroll = new JScrollPane(table);
        scroll.setBackground(new Color(0,0,0,100));
        table.setFillsViewportHeight(true);

        return scroll;
    }

}

我想知道如何解决这个问题。感谢您的帮助。

Answer 1

Swing 不知道如何处理基于 alpha 的颜色作为背景颜色，它被设计为仅适用于完全透明或完全不透明的组件。

你可以伪造它，通过扩展组件，使它们透明，然后自己执行填充操作

半透明JScrollPane

public class TranslucentScrollPane extends JScrollPane {

    public TranslucentScrollPane() {
        setOpaque(false);
        getViewport().setOpaque(false);
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2d = (Graphics2D) g.create();
        g2d.setColor(getBackground());
        g2d.fill(new Rectangle(0, 0, getWidth(), getHeight()));
        super.paintComponent(g2d);
        g2d.dispose();
    }

}

半透明JTableHeader

public class TranslucentTableHeader extends JTableHeader {

    public TranslucentTableHeader() {
        setOpaque(false);
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2d = (Graphics2D) g.create();
        g2d.setColor(getBackground());
        g2d.fill(new Rectangle(0, 0, getWidth(), getHeight()));
        super.paintComponent(g2d);
        g2d.dispose();
    }


}

半透明JTable

public class TranslucentTable extends JTable {

    public TranslucentTable() {
        setOpaque(false);
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2d = (Graphics2D) g.create();
        g2d.setColor(getBackground());
        g2d.fill(new Rectangle(0, 0, getWidth(), getHeight()));
        getUI().paint(g2d, this);
        g2d.dispose();
    }

    @Override
    protected JTableHeader createDefaultTableHeader() {
        JTableHeader header = new TranslucentTableHeader();
        header.setColumnModel(getColumnModel());
        return header;
    }



}

总而言之...

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                String[] colNames = {"Aircraft",
                         "Track ID",
                         "Runway",
                         "Operation Type",
                         "Number Daily of Operations"};
                Object[][] data = {{"Boeing 717",(long) 2459,"01L","Arrival",0.13},{"Boeing 727",(long) 2439,"01R","Arrival",0.12}};

                JTable table = new TranslucentTable();
                DefaultTableModel model = new DefaultTableModel(data, colNames);
                table.setModel(model);

                table.setFont(new Font("Serif", Font.BOLD, 20));
                table.getTableHeader().setFont(new Font("Serif", Font.BOLD, 20));
                table.getTableHeader().setBackground(new Color(0, 0, 0, 100));
                table.getTableHeader().setBorder(BorderFactory.createMatteBorder(3, 3, 3, 3, Color.BLACK));
                table.getTableHeader().setForeground(Color.WHITE);
                table.setRowHeight(table.getRowHeight() + table.getFont().getSize());
                table.setBackground(new Color(214, 217, 223));
                table.setAutoCreateRowSorter(true);
                DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
                centerRenderer.setHorizontalAlignment(SwingConstants.CENTER);

                for (int i = 0; i < colNames.length; i++) {
                    table.getColumnModel().getColumn(i).setCellRenderer(centerRenderer);
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                frame.getContentPane().setBackground(Color.RED);
                TranslucentScrollPane scrollPane = new TranslucentScrollPane();
                scrollPane.setBackground(new Color(0, 0, 0, 200));
                scrollPane.setViewportView(table);

                frame.add(scrollPane);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

}