/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package dnd;import javax.swing.*;import java.awt.*;import java.awt.datatransfer.*;import java.awt.event.*;public class ChooseDropActionDemo extends JFrame {        DefaultListModel from = new DefaultListModel();    DefaultListModel copy = new DefaultListModel();    DefaultListModel move = new DefaultListModel();    JList dragFrom;        public ChooseDropActionDemo() {        super("ChooseDropActionDemo");                for (int i = 15; i >= 0; i--) {            from.add(0, "Source item " + i);        }        for (int i = 2; i >= 0; i--) {            copy.add(0, "Target item " + i);            move.add(0, "Target item " + i);        }        JPanel p = new JPanel();        p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));        dragFrom = new JList(from);        dragFrom.setTransferHandler(new FromTransferHandler());        dragFrom.setPrototypeCellValue("List Item WWWWWW");        dragFrom.setDragEnabled(true);        dragFrom.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);        JLabel label = new JLabel("Drag from here:");        label.setAlignmentX(0f);        p.add(label);        JScrollPane sp = new JScrollPane(dragFrom);        sp.setAlignmentX(0f);        p.add(sp);        add(p, BorderLayout.WEST);                JList moveTo = new JList(move);        moveTo.setTransferHandler(new ToTransferHandler(TransferHandler.COPY));        moveTo.setDropMode(DropMode.INSERT);        JList copyTo = new JList(copy);        copyTo.setTransferHandler(new ToTransferHandler(TransferHandler.MOVE));        copyTo.setDropMode(DropMode.INSERT);                p = new JPanel();        p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));        label = new JLabel("Drop to COPY to here:");;        label.setAlignmentX(0f);        p.add(label);        sp = new JScrollPane(moveTo);        sp.setAlignmentX(0f);        p.add(sp);        label = new JLabel("Drop to MOVE to here:");        label.setAlignmentX(0f);        p.add(label);        sp = new JScrollPane(copyTo);        sp.setAlignmentX(0f);        p.add(sp);        p.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 0));        add(p, BorderLayout.CENTER);                ((JPanel)getContentPane()).setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));        getContentPane().setPreferredSize(new Dimension(320, 315));    }     private static void createAndShowGUI() {        //Create and set up the window.        ChooseDropActionDemo test = new ChooseDropActionDemo();        test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                //Display the window.        test.pack();        test.setVisible(true);    }     public static void main(String[] args) {        SwingUtilities.invokeLater(new Runnable() {            public void run() {                //Turn off metal's use of bold fonts	        UIManager.put("swing.boldMetal", Boolean.FALSE);                createAndShowGUI();            }        });    }        class FromTransferHandler extends TransferHandler {        public int getSourceActions(JComponent comp) {            return COPY_OR_MOVE;        }        private int index = 0;        public Transferable createTransferable(JComponent comp) {            index = dragFrom.getSelectedIndex();            if (index < 0 || index >= from.getSize()) {                return null;            }            return new StringSelection((String)dragFrom.getSelectedValue());        }                public void exportDone(JComponent comp, Transferable trans, int action) {            if (action != MOVE) {                return;            }            from.removeElementAt(index);        }    }        class ToTransferHandler extends TransferHandler {        int action;                public ToTransferHandler(int action) {            this.action = action;        }                public boolean canImport(TransferHandler.TransferSupport support) {            // for the demo, we'll only support drops (not clipboard paste)            if (!support.isDrop()) {                return false;            }            // we only import Strings            if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) {                return false;            }            boolean actionSupported = (action & support.getSourceDropActions()) == action;            if (actionSupported) {                support.setDropAction(action);                return true;            }            return false;        }        public boolean importData(TransferHandler.TransferSupport support) {            // if we can't handle the import, say so            if (!canImport(support)) {                return false;            }            // fetch the drop location            JList.DropLocation dl = (JList.DropLocation)support.getDropLocation();            int index = dl.getIndex();            // fetch the data and bail if this fails            String data;            try {                data = (String)support.getTransferable().getTransferData(DataFlavor.stringFlavor);            } catch (UnsupportedFlavorException e) {                return false;            } catch (java.io.IOException e) {                return false;            }            JList list = (JList)support.getComponent();            DefaultListModel model = (DefaultListModel)list.getModel();            model.insertElementAt(data, index);            Rectangle rect = list.getCellBounds(index, index);            list.scrollRectToVisible(rect);            list.setSelectedIndex(index);            list.requestFocusInWindow();            return true;        }      } }