mainframe.java~5~

鼠标拖放的实现,Java 编程

package jdraganddropdemo;

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

public class MainFrame extends JFrame implements DropTargetListener {
  private JPanel contentPane;
  private BorderLayout borderLayout1 = new BorderLayout();
  private JTextField jTextField1 = new JTextField();

  //Construct the frame
  public MainFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(MainFrame.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(410, 114));
    this.setTitle("JDragAndDropDemo");
    jTextField1.setFont(new java.awt.Font("Dialog", 0, 14));
    contentPane.add(jTextField1, BorderLayout.SOUTH);
  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
  public void dragEnter(DropTargetDragEvent dtde) {
    /**@todo Implement this java.awt.dnd.DropTargetListener method*/
    //throw new java.lang.UnsupportedOperationException("Method dragEnter() not yet implemented.");
  }
  public void dragOver(DropTargetDragEvent dtde) {
    /**@todo Implement this java.awt.dnd.DropTargetListener method*/
    //throw new java.lang.UnsupportedOperationException("Method dragOver() not yet implemented.");
  }
  public void dropActionChanged(DropTargetDragEvent dtde) {
    /**@todo Implement this java.awt.dnd.DropTargetListener method*/
    //throw new java.lang.UnsupportedOperationException("Method dropActionChanged() not yet implemented.");
  }
  public void dragExit(DropTargetEvent dte) {
    /**@todo Implement this java.awt.dnd.DropTargetListener method*/
    //throw new java.lang.UnsupportedOperationException("Method dragExit() not yet implemented.");
  }
  public void drop(DropTargetDropEvent dtde) {
    /**@todo Implement this java.awt.dnd.DropTargetListener method*/
    //throw new java.lang.UnsupportedOperationException("Method drop() not yet implemented.");
    try{
      Transferable tr = dtde.getTransferable();
      if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor)){
        dtde.acceptDrop(dtde.getDropAction());
        String s = (String) tr.getTransferData(DataFlavor.stringFlavor);
        this.jTextField1.setText(s);
        dtde.dropComplete(true);
      }else{
        dtde.rejectDrop();

      }
    }catch(Exception err){
        err.printStackTrace();
      }
  }
}