/*

 * Copyright (c) 1997, 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

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package sun.awt.windows;

import java.awt.Component;

import java.awt.Cursor;

import java.awt.Image;

import java.awt.Point;

import java.awt.image.BufferedImage;

import java.awt.image.DataBufferInt;

import java.awt.datatransfer.Transferable;

import java.awt.dnd.DragGestureEvent;

import java.awt.dnd.InvalidDnDOperationException;

import java.awt.event.InputEvent;

import java.util.Map;

import sun.awt.dnd.SunDragSourceContextPeer;

/**

 * <p>

 * TBC

 * </p>

 *

 * @since JDK1.2

 *

 */

final class WDragSourceContextPeer extends SunDragSourceContextPeer {

    public void startSecondaryEventLoop(){

        WToolkit.startSecondaryEventLoop();

    }

    public void quitSecondaryEventLoop(){

        WToolkit.quitSecondaryEventLoop();

    }

    private static final WDragSourceContextPeer theInstance =

        new WDragSourceContextPeer(null);

    /**

     * construct a new WDragSourceContextPeer. package private

     */

    private WDragSourceContextPeer(DragGestureEvent dge) {

        super(dge);

    }

    static WDragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {

        theInstance.setTrigger(dge);

        return theInstance;

    }

    protected void startDrag(Transferable trans,

        long nativeCtxtLocal = 0;

        nativeCtxtLocal = createDragSource(getTrigger().getComponent(),

                                           trans,

                                           getTrigger().getTriggerEvent(),

                                           getTrigger().getSourceAsDragGestureRecognizer().getSourceActions(),

                                           formats,

                                           formatMap);

        if (nativeCtxtLocal == 0) {

            throw new InvalidDnDOperationException("failed to create native peer");

        }

        int[] imageData = null;

        Point op = null;

        Image im = getDragImage();

        int imageWidth = -1;

        int imageHeight = -1;

        if (im != null) {

            //image is ready (partial images are ok)

            try{

                imageWidth = im.getWidth(null);

                imageHeight = im.getHeight(null);

                if (imageWidth < 0 || imageHeight < 0) {

                    throw new InvalidDnDOperationException("drag image is not ready");

                }

                //We could get an exception from user code here.

                //"im" and "dragImageOffset" are user-defined objects

                op = getDragImageOffset(); //op could not be null here

                BufferedImage bi = new BufferedImage(

                        imageWidth,

                        imageHeight,

                        BufferedImage.TYPE_INT_ARGB);

                bi.getGraphics().drawImage(im, 0, 0, null);

                //we can get out-of-memory here

                imageData = ((DataBufferInt)bi.getData().getDataBuffer()).getData();

            } catch (Throwable ex) {

                throw new InvalidDnDOperationException("drag image creation problem: " + ex.getMessage());

            }

        }

        //We shouldn't have user-level exceptions since now.

        //Any exception leads to corrupted D'n'D state.

        setNativeContext(nativeCtxtLocal);

        WDropTargetContextPeer.setCurrentJVMLocalSourceTransferable(trans);

        if (imageData != null) {

            doDragDrop(

                    getNativeContext(),

                    getCursor(),

                    imageData,

                    imageWidth, imageHeight,

                    op.x, op.y);

        } else {

            doDragDrop(

                    getNativeContext(),

                    getCursor(),

                    null,

                    -1, -1,

                    0, 0);

        }

    }

    /**

     * downcall into native code

     */

    native long createDragSource(Component component,

                                 Transferable transferable,

                                 InputEvent nativeTrigger,

                                 int actions,

                                 long[] formats,

    /**

     * downcall into native code

     */

    native void doDragDrop(

            long nativeCtxt,

            Cursor cursor,

            int[] imageData,

            int imgWidth, int imgHight,

            int offsetX, int offsetY);

    protected native void setNativeCursor(long nativeCtxt, Cursor c, int cType);

}