testdragsource.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import java.awt.dnd.*;
import javax.swing.*;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestDragSource
{
	JFrame jf = new JFrame("Swing的拖放支持");
	JLabel srcLabel = new JLabel("AWT的拖放支持.\n"
		+"将该文本域的内容拖入其他程序.\n");
	public void init()
	{
		DragSource dragSource = DragSource.getDefaultDragSource();
		//将srcLabel转换成拖放源，它能接受复制、移动两种操作
		dragSource.createDefaultDragGestureRecognizer(srcLabel,
			DnDConstants.ACTION_COPY_OR_MOVE, new DragGestureListener()
			{
				public void dragGestureRecognized(DragGestureEvent event)
				{  
					//将JLabel里的文本信息包装成Transferable对象
					String txt = srcLabel.getText();
					Transferable transferable = new StringSelection(txt);
					//继续拖放操作,拖放过程中使用手状光标
					event.startDrag(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR), 
						transferable);
				}
			});
		jf.add(new JScrollPane(srcLabel));
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jf.pack();
		jf.setVisible(true);
	}
	public static void main(String[] args) 
	{
		new TestDragSource().init();
	}
}