/*

 * Copyright (c) 2009, 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

 *

 * 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();

    }

}