看JAVA TUTORIAL里面关于SWING的介绍,尤其是鼠标事件监听那部分。网上可以免费下载。
其他JAVA书也看鼠标事件监听的部分就可以了。一般就是 MyGUI implements MouseMotionListener,MouseListener{}
再在类里面重写 mouseDragged(MouseEvent e){}
mouseMoved(MouseEvent e) {}mouseClicked(MouseEvent e) {}mouseEntered(MouseEvent e) {}
mouseExited(MouseEvent e) {}
mousePressed(MouseEvent e) {}
mouseReleased(MouseEvent e) {}这些方法。
其他JAVA书也看鼠标事件监听的部分就可以了。一般就是 MyGUI implements MouseMotionListener,MouseListener{}
再在类里面重写 mouseDragged(MouseEvent e){}
mouseMoved(MouseEvent e) {}mouseClicked(MouseEvent e) {}mouseEntered(MouseEvent e) {}
mouseExited(MouseEvent e) {}
mousePressed(MouseEvent e) {}
mouseReleased(MouseEvent e) {}这些方法。
* @version 1.00 1999-09-11
* @author Cay Horstmann
*/import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.io.*;
import java.util.*;
import javax.swing.*;public class DropTargetTest
{ public static void main(String[] args)
{ JFrame frame = new DropTargetFrame();
frame.show();
}
}class DropTargetFrame extends JFrame
{ public DropTargetFrame()
{ setTitle("DropTarget");
setSize(300, 300);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
} ); Container contentPane = getContentPane();
JTextArea textArea
= new JTextArea("Drop items into this text area.\n"); new DropTarget(textArea,
new TextDropTargetListener(textArea));
contentPane.add(new JScrollPane(textArea), "Center");
}
}
class TextDropTargetListener implements DropTargetListener
{ public TextDropTargetListener(JTextArea ta)
{ textArea = ta;
} public void dragEnter(DropTargetDragEvent event)
{ int a = event.getDropAction();
if ((a & DnDConstants.ACTION_COPY) != 0)
textArea.append("ACTION_COPY\n");
if ((a & DnDConstants.ACTION_MOVE) != 0)
textArea.append("ACTION_MOVE\n");
if ((a & DnDConstants.ACTION_LINK) != 0)
textArea.append("ACTION_LINK\n"); if (!isDragAcceptable(event))
{ event.rejectDrag();
return;
}
} public void dragExit(DropTargetEvent event)
{
} public void dragOver(DropTargetDragEvent event)
{ // you can provide visual feedback here
} public void dropActionChanged(DropTargetDragEvent event)
{ if (!isDragAcceptable(event))
{ event.rejectDrag();
return;
}
} public void drop(DropTargetDropEvent event)
{ if (!isDropAcceptable(event))
{ event.rejectDrop();
return;
} event.acceptDrop(DnDConstants.ACTION_COPY); Transferable transferable = event.getTransferable(); DataFlavor[] flavors
= transferable.getTransferDataFlavors();
for (int i = 0; i < flavors.length; i++)
{ DataFlavor d = flavors[i];
textArea.append("MIME type=" + d.getMimeType() + "\n"); try
{ if (d.equals(DataFlavor.javaFileListFlavor))
{ java.util.List fileList = (java.util.List)
transferable.getTransferData(d);
Iterator iterator = fileList.iterator();
while (iterator.hasNext())
{ File f = (File)iterator.next();
textArea.append(f + "\n");
}
}
else if (d.equals(DataFlavor.stringFlavor))
{ String s = (String)
transferable.getTransferData(d);
textArea.append(s + "\n");
}
else if (d.isMimeTypeEqual("text/plain"))
{ String charset = d.getParameter("charset");
InputStream in = (InputStream)
transferable.getTransferData(d); boolean more = true;
int ch;
if (charset.equals("ascii"))
{ do
{ ch = in.read();
if (ch != 0 && ch != -1)
textArea.append("" + (char)ch);
else more = false;
} while (more);
}
else if (charset.equals("unicode"))
{ boolean littleEndian = true;
// if no byte ordering , we assume
// Windows is the culprit
do
{ ch = in.read();
int ch2 = in.read();
if (ch != -1 && littleEndian)
ch = (ch & 0xFF) | ((ch2 & 0xFF) << 8);
if (ch == 0xFFFE)
littleEndian = false;
else if (ch != 0 && ch != -1)
textArea.append("" + (char)ch);
else more = false;
} while (more);
} textArea.append("\n");
}
}
catch(Exception e)
{ textArea.append("Error: " + e + "\n");
}
}
event.dropComplete(true);
} public boolean isDragAcceptable(DropTargetDragEvent event)
{ // usually, you check the available data flavors here
// in this program, we accept all flavors
return (event.getDropAction()
& DnDConstants.ACTION_COPY_OR_MOVE) != 0;
} public boolean isDropAcceptable(DropTargetDropEvent event)
{ // usually, you check the available data flavors here
// in this program, we accept all flavors
return (event.getDropAction()
& DnDConstants.ACTION_COPY_OR_MOVE) != 0;
} private JTextArea textArea;
}