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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * 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.  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
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 */

package com.sun.javafx.tk;

import javafx.scene.input.TransferMode;

/**
 * Listens for drop target events on a TKScene.
 * 

 * The implementation of this interface uses the event objects' pointer position
 * to determine if any nodes in the scene graph are to be notified
 * of drag gesture events.
 * 

 * TODO: extend this interface to include dropActionChanged() notification  
 */
public interface TKDropTargetListener {

    /**
     * Called during a drag gesture, when the mouse pointer enters
     * the operable part of the Scene.
     *
     * @return transfer mode chosen by potential target
     */
    public TransferMode dragEnter(double x, double y, double screenX, double screenY,
                                  TransferMode transferMode);

    /**
     * Called during a drag gesture, while the mouse pointer is still
     * over (is moving over) the operable part of the Sceme.
     *
     * @return transfer mode chosen by potential target
     */
    public TransferMode dragOver(double x, double y, double screenX, double screenY,
                                 TransferMode transferMode);

    /**
     * Called during a drag gesture, when the mouse pointer exits
     * the operable part of the Scene.
     */
    public void dragExit(double x, double y, double screenX, double screenY);

    /**
     * Called when the drag gesture is being terminated with a drop on
     * the operable part Scene.
     * 

     * This method is responsible for undertaking
     * the transfer of the data associated with the
     * gesture. The dropTargetDropEvent
     * provides a means to obtain an
     * object that represents the data object(s) to
     * be transfered.
     * 

     * From this method, the implemenation needs to
     * allow {javafx.scene.transfer.DragEvent#accept()} or
     * {javafx.scene.transfer.DragEvent#reject()} to be called from a drop
     * target node in the scene graph.
     * 

     * Subsequent to {javafx.scene.transfer.DragEvent#accept()}, the target
     * node should retrieve the drag gesture's data via the
     * {javafx.scene.transfer.DragEvent#dragboard}
     * 

     * At the completion of a drop, the target node is required to call
     * {javafx.scene.transfer.DragEvent#dropComplete(boolean))}.
     * 

     * Note: The data transfer should be completed before the call to
     * {javafx.scene.transfer.DragEvent#dropComplete(boolean))}.
     * After that, the transfer of data can only succeed if the data transfer is
     * local (within the same VM hosting the running JavaFX code).
     * 

     * @return transfer mode chosen by target
     */
    public TransferMode drop(double x, double y, double screenX, double screenY,
                             TransferMode transferMode);
}