java - 如何为我的 JTable 接收 mouseDragged 事件

Question

我正在尝试为 JTable 编写自定义的拖放行为，但无法接收 MOUSE_DRAGGED 事件。我想问题是 native DnD 操作消耗了事件(如 mouseDragged 的 javadoc 中所述:“由于平台相关的拖放实现，MOUSE_DRAGGED 事件可能不会在 native 拖放过程中传递操作。”)，但我正在寻找一种方法来禁用它或解决它。

这是一个演示问题的 SSCCE:

public class DragAndDrop {
    @SuppressWarnings("serial")
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.getContentPane().add(
                new JTable(
                        new Object[][] {{1,2,3},{4,5,6}}, 
                        new Object[] {"one", "two", "three"}) 
                {{

                        addMouseListener(new MouseAdapter() {

                            @Override
                            public void mouseDragged(MouseEvent e) {
                                System.out.println("mouseDragged");
                            }

                            @Override
                            public void mousePressed(MouseEvent e) {
                                System.out.println("mousePressed");
                            }

                            @Override
                            public void mouseReleased(MouseEvent e) {
                                System.out.println("mouseReleased");
                            }

                        });
                }}
        );

        f.setVisible(true);
    }
}

Answer 1

• 只有通过使用适当的 Mouse(Xxx)Listener 并与 MouseAdapter 结合使用时才会出错

• 您添加了 MouseListener，正确的可能是 MouseListener 并与 MouseMotionListener 一起，您可以将这两个 Listener 拆分为两个单独的代码块(另一个可能的错误)TransferHandler

.

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JTable;

public class DragAndDrop {

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new JTable(new Object[][]{{1, 2, 3}, {4, 5, 6}},
                new Object[]{"one", "two", "three"}) {
            {
                addMouseMotionListener(new MouseAdapter() {
                    @Override
                    public void mouseDragged(MouseEvent e) {
                        System.out.println("mouseDragged");
                    }

                    @Override
                    public void mousePressed(MouseEvent e) {
                        System.out.println("mousePressed");
                    }

                    @Override
                    public void mouseReleased(MouseEvent e) {
                        System.out.println("mouseReleased");
                    }
                });
            }
        });
        f.setVisible(true);
    }
}

与

run: 
mouseDragged mouseDragged mouseDragged 
mouseDragged mouseDragged 
BUILD STOPPED (total time: 1 minute 11 seconds)