/*

 * 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();

        setLayout(new FlowLayout());

        this.bgColor = bgColor;

        this.htColor = htColor;

        setBackground(bgColor);

        setDropTarget(new DropTarget(this, this));

        add(new Label("drop here"));

    }

    boolean check(DropTargetDragEvent dtde)

    {

        if (dtde.getCurrentDataFlavorsAsList().contains(DataFlavor.javaFileListFlavor)) {

            dtde.acceptDrag(DnDConstants.ACTION_COPY);

            return true;

        }

        return false;

    }

    public void dragEnter(DropTargetDragEvent dtde) {

        if(check(dtde)){

            setBackground(htColor);

            repaint();

        }

    }

    public void dragOver(DropTargetDragEvent dtde) {

        check(dtde);

    }

    public void dropActionChanged(DropTargetDragEvent dtde) {

        check(dtde);

    }

    public void dragExit(DropTargetEvent e) {

        setBackground(bgColor);

        repaint();

    }

    public void dragScroll(DropTargetDragEvent e) {

        System.out.println("[Target] dragScroll");

    }

    public void drop(DropTargetDropEvent dtde) {

        System.out.println("[Target] drop");

        boolean success = false;

        dtde.acceptDrop(DnDConstants.ACTION_COPY);

        if( dtde.getCurrentDataFlavorsAsList().contains(DataFlavor.javaFileListFlavor) ){

            System.out.println("[Target] DROP OK!");

            try {

                Transferable transfer = dtde.getTransferable();

                java.util.List<File> fl = (java.util.List<File>)transfer.getTransferData(DataFlavor.javaFileListFlavor);

                for(File f : fl){

                    add(new Button(f.getCanonicalPath()));

                    System.out.println("[Target] drop file:" + f.getCanonicalPath());

                }

                validate();

            } catch(Exception ex) {

                ex.printStackTrace();

            }

            setBackground(bgColor);

            repaint();

            success = true;

        }

        dtde.dropComplete(success);

    }

}