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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * Panel is a DropTarget 28 * 29 */ 30 31 import java.awt.*; 32 import java.awt.datatransfer.*; 33 import java.awt.dnd.*; 34 import java.io.*; 35 36 37 class DnDTarget extends Panel implements DropTargetListener { 38 private int dragOperation = DnDConstants.ACTION_COPY | DnDConstants.ACTION_MOVE; 39 Color bgColor; 40 Color htColor; 41 42 DnDTarget(Color bgColor, Color htColor) { 43 super(); 44 this.bgColor = bgColor; 45 this.htColor = htColor; 46 setBackground(bgColor); 47 setDropTarget(new DropTarget(this, this)); 48 } 49 50 51 public void dragEnter(DropTargetDragEvent e) { 52 System.out.println("[Target] dragEnter"); 53 setBackground(htColor); 54 repaint(); 55 } 56 57 public void dragOver(DropTargetDragEvent e) { 58 System.out.println("[Target] dragOver"); 59 } 60 61 public void dragExit(DropTargetEvent e) { 62 System.out.println("[Target] dragExit"); 63 setBackground(bgColor); 64 repaint(); 65 } 66 67 public void dragScroll(DropTargetDragEvent e) { 68 System.out.println("[Target] dragScroll"); 69 } 70 71 public void dropActionChanged(DropTargetDragEvent e) { 72 System.out.println("[Target] dropActionChanged"); 73 } 74 75 public void drop(DropTargetDropEvent dtde) { 76 System.out.println("[Target] drop"); 77 boolean success = false; 78 if ((dtde.getDropAction() & dragOperation) == 0) { 79 dtde.rejectDrop(); 80 Label label = new Label("[no links here :) ]"); 81 label.setBackground(Color.cyan); 82 add(label); 83 } else { 84 dtde.acceptDrop(dragOperation); 85 DataFlavor[] dfs = dtde.getCurrentDataFlavors(); 86 if (dfs != null && dfs.length >= 1){ 87 Transferable transfer = dtde.getTransferable(); 88 try { 89 Button button = (Button)transfer.getTransferData(dfs[0]); 90 if( button != null ){ 91 add(button); 92 success = true; 93 } 94 } catch (IOException ioe) { 95 System.out.println(ioe.getMessage()); 96 return; 97 } catch (UnsupportedFlavorException ufe) { 98 System.out.println(ufe.getMessage()); 99 return; 100 } catch (Exception e) { 101 System.out.println(e.getMessage()); 102 return; 103 } 104 } 105 } 106 setBackground(bgColor); 107 dtde.dropComplete(success); 108 109 invalidate(); 110 validate(); 111 repaint(); 112 } 113 }