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Java example source code file (DnDTarget.java)
The DnDTarget.java Java example source code/* * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * Panel is a DropTarget * */ import java.awt.*; import java.awt.datatransfer.*; import java.awt.dnd.*; import java.io.*; class DnDTarget extends Panel implements DropTargetListener { private int dragOperation = DnDConstants.ACTION_COPY | DnDConstants.ACTION_MOVE; Color bgColor; Color htColor; DnDTarget(Color bgColor, Color htColor) { super(); this.bgColor = bgColor; this.htColor = htColor; setBackground(bgColor); setDropTarget(new DropTarget(this, this)); } public void dragEnter(DropTargetDragEvent e) { System.out.println("[Target] dragEnter"); setBackground(htColor); repaint(); } public void dragOver(DropTargetDragEvent e) { System.out.println("[Target] dragOver"); } public void dragExit(DropTargetEvent e) { System.out.println("[Target] dragExit"); setBackground(bgColor); repaint(); } public void dragScroll(DropTargetDragEvent e) { System.out.println("[Target] dragScroll"); } public void dropActionChanged(DropTargetDragEvent e) { System.out.println("[Target] dropActionChanged"); } public void drop(DropTargetDropEvent dtde) { System.out.println("[Target] drop"); boolean success = false; if ((dtde.getDropAction() & dragOperation) == 0) { dtde.rejectDrop(); Label label = new Label("[no links here :) ]"); label.setBackground(Color.cyan); add(label); } else { dtde.acceptDrop(dragOperation); DataFlavor[] dfs = dtde.getCurrentDataFlavors(); if (dfs != null && dfs.length >= 1){ Transferable transfer = dtde.getTransferable(); try { Button button = (Button)transfer.getTransferData(dfs[0]); if( button != null ){ add(button); success = true; } } catch (IOException ioe) { System.out.println(ioe.getMessage()); return; } catch (UnsupportedFlavorException ufe) { System.out.println(ufe.getMessage()); return; } catch (Exception e) { System.out.println(e.getMessage()); return; } } } setBackground(bgColor); dtde.dropComplete(success); invalidate(); validate(); repaint(); } } Other Java examples (source code examples)Here is a short list of links related to this Java DnDTarget.java source code file: |
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