java - 将对象与 JTable 上的单元格关联

Question

我正在尝试将 Ellipse2D 对象与 JTable 上的单元格关联。具体来说，如果用户单击一个 Ellipse2D，那么它将突出显示 JTable 上的一个单元格并接受输入。我需要以允许用户将字符串与每个椭圆关联的方式来执行此操作。

我想做的事情可能吗？如果可能的话我该怎么做？

import java.awt.*;
import java.awt.geom.*;
import java.util.*;
import java.util.List;
import javax.swing.*;

public class SelfContainedExample extends JPanel {
    private List<Shape> shapes = new ArrayList<>();

    public static void main(String[] args)
    {
        EventQueue.invokeLater(() -> createAndShowGUI());
    }

    public SelfContainedExample()
    {
        //Circle of Radios
        shapes.add(new Ellipse2D.Double(250, 100, 20, 20));
        shapes.add(new Ellipse2D.Double(160, 100, 20, 20));
        shapes.add(new Ellipse2D.Double(70, 100, 20, 20));
        shapes.add(new Ellipse2D.Double(70, 160, 20, 20));
        shapes.add(new Ellipse2D.Double(160, 160, 20, 20));
        shapes.add(new Ellipse2D.Double(250, 160, 20, 20));
    }

    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D)g.create();
        g2d.setColor(Color.BLACK);

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        shapes.forEach(g2d::fill);

        g2d.dispose();
    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("Example");
        JPanel panel = new JPanel();

        Object[][] data = {{"1_1", "1_2", "1_3"},
                           {"2_1", "2_2", "2_3"}};

        Object[] columnNames = {"1", "2", "3"};
        JTable jtable = new JTable(data, columnNames);

        panel.setLayout(new BorderLayout());
        panel.add(new SelfContainedExample(), BorderLayout.CENTER);
        panel.add(jtable, BorderLayout.SOUTH);
        panel.setOpaque(true);
        panel.setVisible(true);

        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400,400);
        frame.setLocationByPlatform( false );
        frame.setLocationRelativeTo( null );
        frame.setContentPane( panel );
        frame.setVisible( true );
    }
}

Answer 1

好吧，也许您首先创建一个 HashMap，其中键是椭圆，值是 Point，其中 Point 代表表中椭圆的行/列。

//shapes.add(new Ellipse2D.Double(250, 100, 20, 20));
Ellipse2D.Double ellipse = new Ellipse2D.Double(...);
shapes.add(ellipse);
shapesMap.put(ellipse, new Point(0, 0);

the user clicks on one Ellipse2D then it would highlight a cell on the JTable and accept input.

那么您需要向面板添加一个 MouseListener 并处理 mousePressed() 事件。该代码需要遍历列表才能找到包含该点的椭圆。然后您可以开始在单元格上进行编辑。也许是这样的:

public void mousePressed(MouseEvent e)
{
    for (Ellipse2D.Double ellipse: shapes)
    {
        if (ellipse.contains(e.getPoint())
        {
            table.requestFocusInWindow();
            Point p = shapesMap.get(ellipse);
            table.editCellAt(p.x, p.y);
            break;
        }
    }
}