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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);
}