java - 将图像文件与 Swing TransferHandler 一起使用

Question

由于 TransferHandler 属性仅传输 JLabel 的“text”属性。我将如何处理它来制作图像文件？我需要定制一个 TransferHandler 吗？

Answer 1

How would I go about it to do an image file?

不确定您是否只是尝试传输图标或同时传输图标和文本。

如果你只想要 Icon，你可以使用默认的 TransferHandler:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DragIcon extends JPanel
{
    public DragIcon()
    {
        TransferHandler iconHandler = new TransferHandler( "icon" );
        MouseListener dragListener = new DragMouseAdapter();

        JLabel label1 = new JLabel("Label1");
        label1.setTransferHandler( iconHandler );
        label1.addMouseListener(dragListener);
        label1.setIcon( new ImageIcon("copy16.gif") );

        JLabel label2 = new JLabel("Label2");
        label2.setTransferHandler( iconHandler );
        label2.addMouseListener(dragListener);

        add( label1 );
        add( label2 );
    }

    private class DragMouseAdapter extends MouseAdapter
    {
        public void mousePressed(MouseEvent e)
        {
            JComponent c = (JComponent)e.getSource();
            TransferHandler handler = c.getTransferHandler();
            handler.exportAsDrag(c, e, TransferHandler.COPY);
//          handler.exportAsDrag(c, e, TransferHandler.MOVE);
        }
    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("Drag Icon");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new DragIcon());
        frame.setLocationByPlatform( true );
        frame.setSize(200, 100);
        frame.setVisible( true );
    }

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