1 /*
   2  * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25 * Panel is a DropTarget
  26 *
  27 */
  28 
  29 import java.awt.*;
  30 import java.awt.datatransfer.*;
  31 import java.awt.dnd.*;
  32 import java.io.*;
  33 
  34 
  35 class DnDTarget extends Panel implements DropTargetListener {
  36     private int dragOperation = DnDConstants.ACTION_COPY | DnDConstants.ACTION_MOVE;
  37     Color bgColor;
  38     Color htColor;
  39 
  40     DnDTarget(Color bgColor, Color htColor) {
  41         super();
  42         this.bgColor = bgColor;
  43         this.htColor = htColor;
  44         setBackground(bgColor);
  45         setDropTarget(new DropTarget(this, this));
  46     }
  47 
  48 
  49     public void dragEnter(DropTargetDragEvent e) {
  50         System.out.println("[Target] dragEnter");
  51         setBackground(htColor);
  52         repaint();
  53     }
  54 
  55     public void dragOver(DropTargetDragEvent e) {
  56         System.out.println("[Target] dragOver");
  57     }
  58 
  59     public void dragExit(DropTargetEvent e) {
  60         System.out.println("[Target] dragExit");
  61         setBackground(bgColor);
  62         repaint();
  63     }
  64 
  65     public void dragScroll(DropTargetDragEvent e) {
  66         System.out.println("[Target] dragScroll");
  67     }
  68 
  69     public void dropActionChanged(DropTargetDragEvent e) {
  70         System.out.println("[Target] dropActionChanged");
  71     }
  72 
  73     public void drop(DropTargetDropEvent dtde) {
  74         System.out.println("[Target] drop");
  75         boolean success = false;
  76         if ((dtde.getDropAction() & dragOperation) == 0) {
  77             dtde.rejectDrop();
  78             Label label = new Label("[no links here :) ]");
  79             label.setBackground(Color.cyan);
  80             add(label);
  81         } else {
  82             dtde.acceptDrop(dragOperation);
  83             DataFlavor[] dfs = dtde.getCurrentDataFlavors();
  84             if (dfs != null && dfs.length >= 1){
  85                 Transferable transfer = dtde.getTransferable();
  86                 try {
  87                     Button button = (Button)transfer.getTransferData(dfs[0]);
  88                     if( button != null ){
  89                         add(button);
  90                         success = true;
  91                     }
  92                 } catch (IOException ioe) {
  93                     System.out.println(ioe.getMessage());
  94                     return;
  95                 } catch (UnsupportedFlavorException ufe) {
  96                     System.out.println(ufe.getMessage());
  97                     return;
  98                 }  catch (Exception e) {
  99                     System.out.println(e.getMessage());
 100                     return;
 101                 }
 102             }
 103         }
 104         setBackground(bgColor);
 105         dtde.dropComplete(success);
 106 
 107         invalidate();
 108         validate();
 109         repaint();
 110     }
 111 }