JTable内部的MouseMotionListener

Question

我正在尝试向标签添加MouseMotion事件，并基于鼠标的拖动来移动它，并使它与我的mouse.However一起移动，鼠标操作很难控制，使得此操作不可用。以下是代码

import java.awt.Color;
import java.awt.Component;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;

public class TableTest
{
    public TableTest()
    {
        String[] columnNames =
        { "FileName", "Integer" };
        Object[][] data =
        {
        { new FileName("AAA.jpg", Color.YELLOW), new Integer(2) },
        { new FileName("BBB.png", Color.GREEN), new FileName("BBB.png", Color.GREEN) },
        { new FileName("CCC.jpg", Color.RED), new Integer(-1) }, };
        DefaultTableModel model = new DefaultTableModel(data, columnNames)
        {
            public Class getColumnClass(int column)
            {
                System.out.println("column is" + column);
                return getValueAt(0, column).getClass();
            }
        };
        JTable table = new JTable(model);
        //JTable table = new JTable(data, columnNames);
        table.setDefaultRenderer(FileName.class, new FileNameCellRenderer());
        final JLabel label = new JLabel("TESTING", SwingConstants.CENTER);

        label.setBackground(java.awt.Color.RED);
        label.setBounds(450, 100, 90, 20);
        label.setOpaque(true);
        label.setVisible(true);

        label.addMouseMotionListener(new MouseMotionListener()
        {

            public void mouseDragged(MouseEvent arg0)
            {
                label.setBounds(arg0.getX(), arg0.getY(), 90, 20);

            }

            public void mouseMoved(MouseEvent arg0)
            {
                // TODO Auto-generated method stub

            }

        });
        table.add(label);
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(table);
        frame.setSize(800, 600);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    static class FileNameCellRenderer extends DefaultTableCellRenderer
    {
        public Component getTableCellRendererComponent(JTable table, Object v,
                boolean isSelected, boolean hasFocus, int row, int column)
        {
            super.getTableCellRendererComponent(table, v, isSelected, hasFocus,
                    row, column);
            FileName fn = (FileName) v;
            setBorder(BorderFactory.createMatteBorder(0, 60, 0, 0,
                    new java.awt.Color(143, 188, 143)));
            return this;
        }
    }

    static class FileName
    {
        public final Color color;

        public final String label;

        FileName(String l, Color c)
        {
            this.label = l;
            this.color = c;
        }

        public String toString()
        {
            return label;
        }
    }

    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new TableTest();
            }
        });
    }
}

我只是想让标签跟随标签，跟随我的鼠标，标签应该贴在table.Is上，有一种比这更简单的方法。

Answer 1

首先，我认为您错误地使用了鼠标事件坐标(x，y)，因为它们是相对于源组件的。在这种情况下，源是标签本身。因此，您应该将源组件的原始(x，y)添加到这些值中：

label.setBounds(label.getX() + arg0.getX(), label.getY() + arg0.getY(),90,20);

自从我不得不与鼠标事件作斗争已经有一段时间了，但也许你可以尝试一下，让我们知道它是否有帮助。

另一件我不确定的事情是在JTable中添加标签。JTable的LayoutManager可能会阻止您以这种方式实际实现，您可能需要在表的顶部使用GlassPane或其他东西。