语源科技BlogJava-海阔天空

退曳功能示例

争一代雄风 — Thu, 23 Aug 2012 12:18:00 GMT

package radar;

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

public class DragFrame extends JFrame {
   private boolean startDrag = false;
   private Point p = null;

   public static void main(String[] args) {
       DragFrame df = new DragFrame();
//       df.setUndecorated(true);
       df.setAlwaysOnTop(true);
       df.setSize(400, 400);
       df.setVisible(true);
   }

   public DragFrame() {
       addMouseListener(new MouseAdapter() {
           public void mousePressed(MouseEvent e) {
               startDrag = true;
               p = e.getPoint();
           }

           public void mouseReleased(MouseEvent e) {
               startDrag = false;
           }
       });
       addMouseMotionListener(new MouseMotionAdapter() {
           public void mouseDragged(MouseEvent e) {
               Point p1 = e.getPoint();
               Point p2 = getLocation(null);
               p2.x += p1.x - p.x;
               p2.y += p1.y - p.y;
               setLocation(p2);
           }
       });
   }
}

争一代雄风 2012-08-23 20:18 发表评论

拖曳功能改进

争一代雄风 — Thu, 23 Aug 2012 12:15:00 GMT

package com.util;

import java.awt.Component;
import java.awt.Frame;
import java.awt.Point;
import java.awt.event.MouseAdapter;

import javax.swing.JFrame;

public class DragJFrame extends MouseAdapter {

   Point loc = null;

   Point tmp = null;

   boolean isDragged = false;
   Frame frame=null;
   JFrame jFrame=null;
   Component compoent;

   /*public DragFrame(Component compoent,Frame frame){
       this.compoent=compoent;
       this.frame=frame;
       this.setDragable(this.compoent,this.frame);
       System.out.println("frame");

   }*/
   /**
   * compoent
   */
   public DragJFrame(Component compoent,JFrame jFrame){
       this.compoent=compoent;
       this.jFrame=jFrame;
       this.setDragable(this.compoent,this.jFrame);
       System.out.println("jframe");

   }

   private void setDragable(Component compoent, final JFrame jFrame) {

       compoent.addMouseListener(new java.awt.event.MouseAdapter() {

           public void mouseReleased(java.awt.event.MouseEvent e) {

               isDragged = false;
           }

           public void mousePressed(java.awt.event.MouseEvent e) {

               tmp = new Point(e.getX(), e.getY());
               isDragged = true;

           }

       });

       compoent.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {

           public void mouseDragged(java.awt.event.MouseEvent e) {

               if (isDragged) {

                   loc = new Point(jFrame.getLocation().x + e.getX() - tmp.x,

                           jFrame.getLocation().y + e.getY() - tmp.y);

                   jFrame.setLocation(loc);

               }

           }

       });

   }



}

争一代雄风 2012-08-23 20:15 发表评论

拖曳文件获取文件路径

争一代雄风 — Tue, 21 Aug 2012 13:03:00 GMT

在网上找了个代码：

package com.zwh.droptarget;

/**
@version 1.02 2004-08-25
@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.*;

/**
* This is a test class to test drag and drop behavior. Drop items into the text
* area to see the MIME types of the drop target.
*/
public class DropTargetTest {
   public static void main(String[] args) {
       JFrame frame = new DropTargetFrame();
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setVisible(true);
   }
}

/**
* This frame contains a text area that is a simple drop target.
*/
class DropTargetFrame extends JFrame {
   public DropTargetFrame() {
       setTitle("DropTarget");
       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

       JTextArea textArea = new JTextArea("Drop items into this text area.\n");

       new DropTarget(textArea, new TextDropTargetListener(textArea));
       add(new JScrollPane(textArea), "Center");
   }

   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 300;
}

/**
* This listener displays the properties of a dropped object.
*/
class TextDropTargetListener implements DropTargetListener {
   /**
   * Constructs a listener.
   *
   * @param aTextArea
   *            the text area in which to display the properties of the
   *            dropped object.
   */
   public TextDropTargetListener(JTextArea aTextArea) {
       textArea = aTextArea;
   }

   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)) {
           //拒绝 Drop。
           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);
                   for (File f : fileList) {
                       textArea.append(f + "\n");
//                       System.out.println("是个文件夹");
                   }
               } else if (d.equals(DataFlavor.stringFlavor)) {
                   String s = (String) transferable.getTransferData(d);
                   textArea.append(s + "\n");
               }
           } catch (Exception e) {
               textArea.append(e + "\n");
           }
       }
       textArea.append("\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;
}

争一代雄风 2012-08-21 21:03 发表评论